NEET 2018

NEET 2018 - Question 1

Report

Niche is

A

the functional role played by the organism where it lives

B

the range of temperature that the organism needs to live

C

the physical space where an organism lives

D

all the biological factors in the organism’s environment

View Solution

NEET 2018 - Question 2

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Which of the following is a secondary pollutant ?

A

$$O_{3}$$

B

$$SO_{2}$$

C

$$CO_{2}$$

D

$$CO$$

View Solution

NEET 2018 - Question 3

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In stratosphere, which of the following elements acts as a catalyst in degradation of ozone and release of molecular oxygen ?

A

Oxygen

B

Fe

C

Cl

D

Carbon

View Solution

NEET 2018 - Question 4

Report

World Ozone Dayis celebrated on

A

$$22^{nd}$$ April

B

$$16^{th}$$ September

C

$$21^{st}$$ April

D

$$5^{th}$$ June

View Solution

NEET 2018 - Question 5

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What type of ecological pyramid would be obtained with the following data?
Secondary consumer:120 g,
Primary consumer: 60 g
Primary producer: 10 g

A

Upright pyramid ofbiomass

B

Upright pyramidofnumbers

C

Pyramid of energy

D

Inverted‘ Pyramid of biomass

View Solution

NEET 2018 - Question 6

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Natality refers to

A

Number of individuals execing a habitat

B

Number of individuals leaving the habitat

C

Birthrate

D

Death rate

View Solution

NEET 2018 - Question 7

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Offsets are produced by

A

Parthenogenesis

B

Parthenocarpy

C

Mitotic divisions

D

Meiotic divisions

View Solution

NEET 2018 - Question 8

Report

The experimental proof for semiconservative replication of DNA was first shown in a

A

Virus

B

Plant

C

Bacteria

D

Fungus

View Solution

NEET 2018 - Question 9

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Select the correct match:

A

Francois Jacob and - Lac operon Jacques Monod

B

Matthew Meselson - Pisum sativum and F. Stahl

C

Alfred Hershey and - TMV Martha Chase

D

Alec Jeffreys - Streptococcus pneumoniae

View Solution

NEET 2018 - Question 10

Report

Which of the following has proved helpful in preserving pollen as fossils ?

A

Sporopollenin

B

Oil content

C

Cellulosic intine

D

Pollenkit

View Solution

NEET 2018 - Question 11

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Which of the following pairs is wrongly matched?

A

T.H Morgan : Linkage

B

XO type sex : Grasshopper determination

C

ABO blood grouping : Co-dominance

D

Starch synthesis in pea : Multiple alleles

View Solution

NEET 2018 - Question 12

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Which of the following flowers only once in a life-time ?

A

Papaya

B

Mango

C

Jackfruit

D

Bamboo species

View Solution

NEET 2018 - Question 13

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Select the Gorrect statement:

A

Transduction was discovered by S. Altman.

B

Spliceosomes take part in translation.

C

Punnett square was developed by a British Scientist.

D

Franklin Stahl coined the term “linkage”.

View Solution

NEET 2018 - Question 14

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The Golgi complex participates in

A

Activation of amino acids

B

Respiration in bacteria

C

Formation of secretory vesicles

D

Fatty acid breakdown

View Solution

NEET 2018 - Question 15

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The stage during which separation of the paired homologous chromosomes begins is

A

Zygotene

B

Diakinesis

C

Diplotene

D

Pachytene

View Solution

NEET 2018 - Question 16

Report

Stomata movement is not affected by

A

$$CO_{2}$$ Concentration

B

$$O_{2}$$ Concentration

C

Light

D

Temperature

View Solution

NEET 2018 - Question 17

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Stomata in grass leaf are

A

Barrel shaped

B

Rectangular

C

Kidney shaped

D

Pampa shapes

View Solution

NEET 2018 - Question 18

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Which of the following is not a product of light reaction of photosynthesis ?

A

Oxygen

B

NADPH

C

NADH

D

ATP

View Solution

NEET 2018 - Question 19

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Which of the following is true for nucleous?

A

It is a site for active ribosomal RNA synthesis.

B

It takes part in spindle formation

C

It is a membrane-bound Structure.

D

Larger nucleoli are present in dividing cells.

View Solution

NEET 2018 - Question 20

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Which among the followis not a prokaryote?

A

Oscillatoria

B

Nostoc

C

Mycobacterium

D

Saccharomyces

View Solution

NEET 2018 - Question 21

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The two functional groups characteristic of sugars are

A

Carbonyl and hydroxyl

B

Carbonyl and phosphate

C

Carbonyl and methyl

D

Hydroxyl and methyl

View Solution

NEET 2018 - Question 22

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Match the items given in Column I with those in Column II and select the correct option given below :

A

a-iii, b-iv, c-i, d-ii

B

a-ii, b-iv, c-iii, d-i

C

a-iii, b-ii, c-i, d-iv

D

a-i, b-iv, c-iii, d-ii

View Solution

NEET 2018 - Question 23

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Which one is wrongly matched ?

A

Unicellular organism - Chlorella

B

Gemma cups - Marchantia

C

Biflagellate zoospores - Brown algae

D

Uniflagellate gametes - Polysiphonia

View Solution

NEET 2018 - Question 24

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After karyogamy followed by Meiosis, spores are produced exogenously in

A

Saccharomyces

B

Agaricus

C

Alternaria’

D

Neurospora

View Solution

NEET 2018 - Question 25

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Winged pollen grains are present in

A

Pinus

B

Mango

C

Cycas

D

Mustard

View Solution

NEET 2018 - Question 26

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Which of the following is commonly used as a vector for introducing a DNA fragment in human lympocytes?

A

pBR 322

B

$$\lambda$$ phage

C

Ti plasmid

D

Retrovirus

View Solution

NEET 2018 - Question 27

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A ‘new’variety of rice was patented by a foreign company, though such varieties have been present in India for a long time. This is related to

A

Basmati

B

Lerma Rojo

C

Sharbati Sonora

D

Co-667

View Solution

NEET 2018 - Question 28

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Use of bioresources by multinational companies and organisations without authorisation from the concerned country andits peopleis called

A

Bipexploitation

B

Bitdegradation

C

Biopiracy

D

Bio-infringement

View Solution

NEET 2018 - Question 29

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Select the correct match:

A

G. Mendel — Transformation

B

T.H. Morgan - Transduction

C

$$F_2 \times$$ Recessive parent - Dihybrid cross

D

Ribozyme — Nucleic acid

View Solution

NEET 2018 - Question 30

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The correct order of steps in Polymerase Chain Reaction (PCR) is

A

Denaturation, Annealing, Extension

B

Denaturation, Extension, Annealing

C

Annealing, Extension, Denaturation

D

Extension, Denaturation, Annealing

View Solution

NEET 2018 - Question 31

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In India,the organisation responsible for assesing the saftey of introducing genetically modified organisms for public use is

A

Genetic Engineering Appraisal Committee(GEAC)

B

Research Committee on Genetic Manipulation (RCGM)

C

Council for Scientific and Industrial Research (CSIR)

D

Indian Council of Medical Research (ICMR)

View Solution

NEET 2018 - Question 32

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What is the role of $$NAD^{+}$$ in cellular respiration ?

A

It is the final electron acceptor for anaerobic respiration

B

It is a nucleotide source for ATP synthesis.

C

It functions as an electron carrier.

D

It functions as an enzyme.

View Solution

NEET 2018 - Question 33

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Which one of the following plants shows a very close relationship with a species of moth, where none of the two can complete its life cycle without the other ?

A

Viola

B

Banana

C

Yucca

D

Hydrilla

View Solution

NEET 2018 - Question 34

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Pollen grains can be stored for several years in liquid nitrogen having a temperature of

A

$$-160^\circ$$ C

B

$$-196^\circ$$ C

C

$$-80^\circ$$ C

D

$$-120^\circ$$ C

View Solution

NEET 2018 - Question 35

Report

In which ofthe following formsis iron absorbed by plants ?

A

Both ferric and ferrous

B

Free element

C

Ferrous

D

Ferric

View Solution

NEET 2018 - Question 36

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Double fertilization is

A

Syngamy and triple fusion

B

Fusion of two male gamates with one egg

C

Fusion of one male gameté,with two polar nuclei

D

Fusion of two male.gametes of a pollen tube with two different eggs

View Solution

NEET 2018 - Question 37

Report

Oxygen is not produced during photosynthesis by

A

Chara

B

Cycas

C

Nostoc

D

Green sulphur bacteria

View Solution

NEET 2018 - Question 38

Report

Which of the following elements is responsible for maintaining turgor in cells ?

A

Calcium

B

Potassium

C

Sodium

D

Magnesium

View Solution

NEET 2018 - Question 39

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Pneumatophores occur in

A

Submerged hydrophytes

B

Carnivorous plants

C

Free-floating hydrophytes

D

Halophytes

View Solution

NEET 2018 - Question 40

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Select the wrong statement:

A

Mitochondria are the powerhouse of the cell in all kingdoms except Monera.

B

Pseudopodia are locomotory and feeding structures in Sporozoans

C

Mushrooms belong to Basidiomycetes.

D

Cell wall is present in members of Fungi and Plantae

View Solution

NEET 2018 - Question 41

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Secondary xylem and phloem in dicot stem are produced by

A

Axillary meristems

B

Phellogen

C

Vascular cambium

D

Apical meristems

View Solution

NEET 2018 - Question 42

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Sweet potato is a modified

A

Rhizome

B

Tap root

C

Adventitious root

D

Stem

View Solution

NEET 2018 - Question 43

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Which of the following statements is correct?

A

Stems are usually unbranched in both Cycas and Cedrus.

B

Horsetails are gymnosperms

C

Seleginella is heterosporous, while Salavinia is homosporous

D

Ovules are not enclosed by ovary wall in gymnosperms

View Solution

NEET 2018 - Question 44

Report

Casparian strips occur in

A

Endodermis

B

Cortex

C

Pericycle

D

Epidermis

View Solution

NEET 2018 - Question 45

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Plants having little or no secondary growth are

A

Cycads

B

Conifers

C

Deciduous angiosperms

D

Grasses

View Solution

NEET 2018 - Question 46

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Nissl bodies are mainly composed of

A

Free ribosomes and RER

B

Nucleic acids and SER

C

DNA and RNA

D

Proteins and lipids

View Solution

NEET 2018 - Question 47

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Which of these statements is incorrect ?

A

Oxidative phosphorylation takes place in outer mitochondrial membrane.

B

Glycolysis operates as long as it is supplied with NAD that can pick up hydrogen atoms.

C

Glycolysis occurs in cytosol.

D

Enzymes of TCA cycle are present in mitochondrial matrix.

View Solution

NEET 2018 - Question 48

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Many ribosomes may associate with a single mRNA to form multiple copies of a polypeptide simultaneously. Such strings of ribosomes are termed as

A

Nucleosome

B

Plastidome

C

Polyhedral bodies

D

Polysome

View Solution

NEET 2018 - Question 49

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Which of the following terms describe human dentition ?

A

Pleurodont, Diphyodont, Heterodont

B

Pleurodont, Monophyodont,Homodont

C

Thecodont, Diphyodont, Heterodont

D

Thecodont, Diphyodont, Homoedont

View Solution

NEET 2018 - Question 50

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Which of the following events does not occur in rough endoplasmic reticulum ?

A

Phospholipid synthesis

B

Cleavage of signal peptide

C

Protein glycosylation

D

Protein folding

View Solution

NEET 2018 - Question 51

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Select the incorrect match:

A

Polytene - Oocytes of amphibians chromosomes

B

Submetacentric - L-shaped chromososmes chromosomes

C

Allosomes-Sex chromosomes

D

Lampbrush-Diplotene bivalents chromosomes

View Solution

NEET 2018 - Question 52

Report

Which ofthe following is an amino acid derived hormone

A

Estriol

B

Estradiol

C

Ecdysone

D

Epinephrine

View Solution

NEET 2018 - Question 53

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Which of the following structures or regions is incorrectly paired with its function ?

A

Corpuscallosum : band of fibers connecting left and right cerebral hemispheres.

B

Hypothalamus : production of releasing hormones and regulation of temperature,hunger and thirst.

C

Limbic system : consists of fibre tracts that interconnect different regions of brain; controls movement:

D

Medulla oblongata : controls respiration and cardiovascular reflexes.

View Solution

NEET 2018 - Question 54

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Which of the following -hormones can play a significant role in osteoporosis ?

A

Parathyroid hormone and Prolactin

B

Estrogen and Parathyroid hormone

C

Progesterone and Aldosterone

D

Aldosterone and Prolactin

View Solution

NEET 2018 - Question 55

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The transparentlens in the human eyeis held in ist place by

A

smooth muscles attached to the ciliary body

B

‘smooth muscles attached to theiris

C

ligaments attached to theiris

D

ligaments attached to theciliary body

View Solution

NEET 2018 - Question 56

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In a growing population of a country,

A

pre-reproductive individuals are less than the reproductive individuals.

B

reproductive and pre-reproductive individuals are equal in number.

C

reproductive individuals are less than the post-reproductive individuals.

D

pre-reproductive individuals are more than the reproductive individuals.

View Solution

NEET 2018 - Question 57

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Match the items given in Column I with those in Column II and select the correct option given below?

A

a-i, b-ii, c-iv ,d-iii

B

a-iii, b-iv, c-i ,d-ii

C

a-i, b-iii, c-iv ,d-ii

D

a-ii, b-i, c-iii,d-iv

View Solution

NEET 2018 - Question 58

Report

Which part of poppy plant is used to obtain the drug “Smack” ?

A

Leaves

B

Roots

C

Latex

D

Flowers

View Solution

NEET 2018 - Question 59

Report

Which one of the following population interactions is widely uséd immedical science for the production of antibiotics,?

A

Amensalism

B

Parasitism

C

Mutualism

D

Commensalism

View Solution

NEET 2018 - Question 60

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All of the, following are included in ‘Ex-situ conservation’except

A

Seéd banks

B

Botanical gardens

C

Sacred groves

D

Wildlife safari parks

View Solution

NEET 2018 - Question 61

Report

Which of the following gastric cells indirectly help in erythropoiesis ?

A

Parietal cells

B

Goblet cells

C

Mucous cells

D

Chief cells

View Solution

NEET 2018 - Question 62

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Match the items given in Column I with those in Column II and select the correct option given below :

A

a-ii, b-iii, c-i

B

a-i, b-iii, c-ii

C

a-i, b-ii, c-iii

D

a-iii, b-ii, c-i

View Solution

NEET 2018 - Question 63

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Calcium is important in skeletal, muscle contraction becauseit

A

prevents the formation of bonds between the myosin cross bridges and the actin filament.

B

detaches the myosin head from the actin filament.

C

activates the myosin ATPase by binding to it.

D

binds to troponin to remove the masking of active sites,on actin for myosin.

View Solution

NEET 2018 - Question 64

Report

Which of the following is an occupational respiratory disorder?

A

Emphysema

B

Botulism

C

Silicosis

D

Anthracis

View Solution

NEET 2018 - Question 65

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AGGTATCGCATis a sequence from the coding strand of a gene. Whatwill be the corresponding sequence of the transcribed mRNA ?

A

UCCAUAGCGUA

B

ACCUAUGCGAU

C

UGGTUTCGCAT

D

AGGUAUCGCAU

View Solution

NEET 2018 - Question 66

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A woman has an X-linked condition on one of her X chromosomes. This chromosome can be inherited by

A

Both sons and daughters

B

Only grandchildren

C

Only sons

D

Only daughters

View Solution

NEET 2018 - Question 67

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Match the items given in Column I with those in Column II and select the correct option given below

A

a-iii, b-i, c-ii

B

a-ii, b-iii, c-i

C

a-i, b-iii, c-ii

D

a-iii, b-ii, c-i

View Solution

NEET 2018 - Question 68

Report

According to Hugo de Vries, the mechanism of evolution is

A

Minor mutations

B

Phenotypic¢ Variations

C

Saltation

D

Multiple step mutations

View Solution

NEET 2018 - Question 69

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All of the followingare part of an operon except

A

a promoter

B

an enhancer

C

structural genes

D

an operator

View Solution

NEET 2018 - Question 70

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Which of the following options correctly represents the lung conditions in asthma and emphysema, respectively ?

A

Decreased respiratory surface; Inflammation of bronchioles

B

Increased respiratory surface; Inflammation of bronchioles

C

Increased number of bronchioles; Increased respiratory surface

D

Inflammation of bronchioles; Decreased respiratory surface

View Solution

NEET 2018 - Question 71

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Match the items given in Column I with those in Column II and select the correct option given below :

A

a-ii, b-i, c-iii

B

a-i, b-ii, c-iii

C

a-i, b-iii, c-ii

D

a-iii, b-i, c-ii

View Solution

NEET 2018 - Question 72

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Match the items given in Column I with those in Column II and select the correct option given below :

A

a-iv, b-iii, c-ii ,d-i

B

a-i, b-iv, c-ii ,d-iii

C

a-iii, b-i, c-iv ,d-ii

D

a-iii, b-ii, c-i ,d-iv

View Solution

NEET 2018 - Question 73

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Hormones secreted by the placenta to maintain pregnancy are

A

hCG, progestogens, estrogens, glucocorticoids

B

hCG, hPL, progestogens, estrogens

C

hCG, hPL, estrogens, relaxin, oxytocin

D

hCG, hPL, progestogens, prolactin

View Solution

NEET 2018 - Question 74

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The contraceptive ‘SAHELI?

A

is a post-coital contraceptive.

B

is an IUD.

C

increases the concentration of estrogen and prevents ovulation in females.

D

blocks estrogen receptors in the uterus, preventing eggs from getting implanted.

View Solution

NEET 2018 - Question 75

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The difference between spermiogenesis and spermiation is

A

In spermiogenesis spermatozoa are formed, while in spermiation spermatozoa are released from sertoli cells into the cavity of seminiferous tubules.

B

In spermiogenesis spermatozoa from sertoli cells are released into, the ‘cavity of seminiferous tubules, while in spermiation spermatozoa are formed.

C

In spermiogenesis spermatozoa are formed, while in spermiation spermatids are informed.

D

In spermiogenesis spermatids are formed, while in spermiation spermatozoa are formed.

View Solution

NEET 2018 - Question 76

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The amnion of mammalian embryo is derived from

A

ectodérm and endoderm

B

mesoderm and trophoblast

C

endoderm and mesoderm

D

ectoderm and mesoderm

View Solution

NEET 2018 - Question 77

Report

Which of thefollowing animals does not undergo metamorphosis ?

A

Starfish

B

Moth

C

Tunicate

D

Earthworm

View Solution

NEET 2018 - Question 78

Report

Which one of these animals is mot a homeotherm ?

A

Psittacula

B

Camelus

C

Chelone

D

iacropus

View Solution

NEET 2018 - Question 79

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Which of the following features is used to identify a male cockroach from a female cockroach ?

A

Presence of analcerci

B

Forewings with darker tegmina

C

Presence of caudal styles

D

Presence of a boat shaped sternum on the $$9^{th}$$ abdominal segment

View Solution

NEET 2018 - Question 80

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Which of the following organisms are known as chief producers in the oceans ?

A

Euglenoids

B

Cyanobacteria

C

Diatoms

D

Dinoflagellates

View Solution

NEET 2018 - Question 81

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Ciliates differ from all otherprotozoans in

A

having two types of nuclei

B

using pseudopodia for capturing prey

C

having a contrattile yacuole for removing excess water

D

using flagella for locomotion

View Solution

NEET 2018 - Question 82

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Identify the vertebrate group of animals characterized)by erop and gizzard in its digestive system.

A

Osteichthyes

B

Aves

C

Reptilia

D

Amphibia

View Solution

NEET 2018 - Question 83

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Match the items given in Column I with those in Column II and select the correct option given below :

A

a-iv, b-i, c-ii, d-iii

B

a-ii, b-iii, c-i, d-iv

C

a-i, b-ii, c-iii, d-iv

D

a-iii, b-ii, c-iv, d-i

View Solution

NEET 2018 - Question 84

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Match the items given in Column I with those in Column II and select the correct option given below :

A

a-v, b-iv, c-i, d-iii

B

a-v, b-iv, c-i, d-ii

C

a-iv, b-i, c-ii, d-iii

D

a-iii, b-v, c-ii, d-iii

View Solution

NEET 2018 - Question 85

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Among the following sets of examples for divergent evolution, select the incorrect option:

A

Eye of octopus, bat and man

B

Brain of bat, man and cheetah

C

Heart of bat, man and cheetah

D

Forelimbs of man, bat and cheetah

View Solution

NEET 2018 - Question 86

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Conversion of milk to curd improves its nutritional value by increasing the amount of

A

Vitamin E

B

Vitamin $$B_{12}$$

C

Vitamin A

D

Vitamin D

View Solution

NEET 2018 - Question 87

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Which of the following characteristics represent ‘Inheritance of blood groups’ in humans?
a. Dominance
b. Co-dominance
c. Multiple allele
d. Incomplete dominance
e. Polygenic inheritance

A

a,c and e

B

b,d and e

C

a,b and e

D

b,c and e

View Solution

NEET 2018 - Question 88

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Which of the following is not an autoimmune disease ?

A

Vitiligo

B

Alzheimer’s disease

C

Rheumatoid arthritis

D

Psoriasis

View Solution

NEET 2018 - Question 89

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The similarity of bone structuréjin the’ forelimbs of many vertebrates is anexample of

A

Adaptive radiation

B

Convergent evolution

C

Analogy

D

Homology

View Solution

NEET 2018 - Question 90

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In which disease does mosquito transmitted pathogen .cause chronic inflammation of vessels

A

Amoebiasis

B

Ring worm disease

C

Ascariasis

D

Elephantiasis

View Solution

NEET 2018 - Question 91

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Acarbon resistor of $$(47 \pm 4.7)  kΩ$$ is to be marked with rings of different colours for its identification. The colour code sequence will be

A

Green- Orange — Violet — Gold

B

Yellow — Green — Violet — Gold

C

Yellow — Violet — Orange — Silver

D

Violet — Yellow — Orange — Silver

View Solution

NEET 2018 - Question 92

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A set of ‘n’ equal resistors, of value ‘R’ each, are connected in series to a battery of emf ‘E’ and internal resistance ‘R’. The current drawn is I. Now,the ‘n’ resistors are connected in parallel to the same battery. Then the current drawn from battery becomes 10 I. The valueof‘n’ is

A

9

B

20

C

11

D

10

View Solution

NEET 2018 - Question 93

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A battery consists of a variable number ‘n’ of identical cells (having internal resistance ‘r' each) which are connected in series. The terminals of the battery are short-circuited and the current I is measured. Which of the graphs shows the correct relationship between I and n?

A

B

C

D

View Solution

NEET 2018 - Question 94

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The power radiated by a black body is P and it radiates maximum energy at wavelength,radiates maximum energy at wavelength,$$\lambda_{0}$$ If the temperature of the black body is now changed so that it radiates maximum energy at wavelength $$\frac{3}{4} \lambda_{0}$$, the power radiated by it becomes nP. The value of n is

A

$$\frac{81}{256}$$

B

$$\frac{256}{81}$$

C

$$\frac{4}{3}$$

D

$$\frac{3}{4}$$

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NEET 2018 - Question 95

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Two wires are made of the same material and have the same volume. The first wire has cross-sectional area A and the second wire has cross-sectional area 3A. If the length ofthe first wire is increased by $$\delta $$ l on applying a force F, how much force is needed to stretch the second wire by the same amount ?

A

F

B

4 F

C

6 F

D

9 F

View Solution

NEET 2018 - Question 96

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A sample of 0:1 g of water at $$100^\circ$$ C and normal pressure $$(1.013 \times 10^{5} N m^{-2})$$ requires 54 cal of heat energy to convert to steam at $$100^\circ$$.If the volume of the steam produced is 167.1 cc, the change in internal energy of thé ssample ,is

A

84.5 J

B

42.2J

C

208-7 J

D

104-3 J

View Solution

NEET 2018 - Question 97

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A small sphere.of radius ‘r’ falls from rest in a viscous liquid. As a result, heat is produced due to viscous force) The rate of production of heat when the sphere attains its terminal velocity, is proportional to

A

$$r^{4}$$

B

$$r^{5}$$

C

$$r^{2}$$

D

$$r^{3}$$

View Solution

NEET 2018 - Question 98

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The momentof the force, $$\overrightarrow{F}=4\hat{i}+5\hat{j}-6\hat{k}$$ at (2, 0, — 3), about the point (2, — 2, — 2), is given by

A

$$-7\hat{i}-4\hat{j}-8\hat{k}$$

B

$$-7\hat{i}-8\hat{j}-4\hat{k}$$

C

$$-4\hat{i}-\hat{j}-8\hat{k}$$

D

$$-8\hat{i}-4\hat{j}-7\hat{k}$$

View Solution

NEET 2018 - Question 99

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A student measured the diameter of a small steel ball using a screw gauge of least count 0-001 cm. The main scale reading is 5 mm and zero of circular scale division coincides with 25 divisions above the reference level. If screw gauge has a zero error of — 0:004 cm,the correct diameter of the ball is

A

0.529 cm

B

0-053 cm

C

0.525 cm

D

0.521 cm

View Solution

NEET 2018 - Question 100

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A toy car with charge q moves ona frictionless horizontal plane surface,under the influence of a uniform electric field $$\overrightarrow{E}$$ Due to the force q $$\overrightarrow{E}$$, its velocity increases from 0 to 6 $$\frac{m}{s}$$ in one second duration.At that instant the direction of the field is reversed . The car continues to move for two more seconds under the influence of this field .The average velocity and the average speed of the toy car between 0 to 3 séconds are respectively

A

$$1.5 \frac{m}{s},3 \frac{m}{s}$$

B

$$1 \frac{m}{s},3.5 \frac{m}{s}$$

C

$$1 \frac{m}{s},3 \frac{m}{s}$$

D

$$2 \frac{m}{s},4 \frac{m}{s}$$

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NEET 2018 - Question 101

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A block of mass m is placed on a smooth inclined wedge ABC of inclination $$\theta$$ as shown in the figure. The wedge is given an acceleration ‘a towards the right. The relation between a and $$\theta$$ for the block to remain stationary on the wedge is

A

$$a=g \tan \theta$$

B

$$a=g \cos \theta$$

C

$$a=\frac{g}{\sin \theta}$$

D

$$a=\frac{g}{\cosec \theta}$$

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NEET 2018 - Question 102

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An em waveis propagating in a medium with a velocity $$\overrightarrow{V}=V\hat{i}$$ The instantaneous oscillating electric field of this em wave is along +y axis.Then the direction of oscillating magnetic field of the em wavewill be along

A

— x direction

B

— y direction

C

+ z direction

D

— z direction

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NEET 2018 - Question 103

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The refractive index of the material of a prism is $$\sqrt{2}$$ and the angle of the prism is $$30^\circ$$.one of the two refracting surfaces of the prism is made a mirror inwards, by silver coating. A beam of monochromatic light entering the prism from the other face will retrace its path (after reflection from the silvered surface)if its angle of incidence on the prism is

A

zero

B

$$30^\circ$$

C

$$45^\circ$$

D

$$60^\circ$$

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NEET 2018 - Question 104

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The magnetic potential energy stored.in a certain inductor is 25 mJ, when the current in the inductor is 60 mA. This inductoris:of inductance

A

13-89 H

B

1:389H

C

138-88H

D

0-138H

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NEET 2018 - Question 105

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An object is placed at a distance of 40 cm from a concave mirror of.focal length 15 cm.If the object is displaced through a distance of 20 cm towards the mirror, the displacementofthe image will be

A

36 cm towards the mirror

B

80cm towards the mirror

C

36 cm away from the mirror

D

30 cm away from the mirror

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NEET 2018 - Question 106

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The ratio of kinetic energy to the total energy of an electron in a Bohrorbit of the hydrogen atom, is

A

1:-2

B

2:-1

C

1:-1

D

1:1

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NEET 2018 - Question 107

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An electron of mass m with an initial velocity $$\overrightarrow{V}=V_{0} \hat{i} (V_{0}>0)$$ enters an electric field $$\overrightarrow{E}=-E_{0} \hat{i}$$ $$(E_{0}=constant >0)$$ at t=0. If $$\lambda_{0}$$ is its de-Broglie wavelength initially, then its de-Broglie wavelength at timet is

A

$$\lambda_{o}$$

B

$$\lambda_{o} t$$

C

$$\lambda_{o} \left(\begin{array}{c}1+\frac{eE_{0}}{m v_{0}} t\end{array}\right)$$

D

$$\frac{\lambda _{o}}{\left(\begin{array}{c}1+\frac{eE_{0}}{m v_{0}} t\end{array}\right)}$$

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NEET 2018 - Question 108

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when the light of frequency 2 $$\nu_{0}$$ ( where $$\nu_{0}$$ is threshhold frequency), is incident on a metal plate ,the maximum velocity of electrons emitted is $$v_{1}$$.when the frequency of the incident radiation is increased to 5 $$\nu_{0}$$, the maximum velocity of electrons emitted from the same plate is $$V_{2}$$.The ratio of $$V_{1}$$ to $$V_{2}$$ is

A

2:1

B

4:1

C

1:4

D

1:2

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NEET 2018 - Question 109

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For a radioactive material, half-life is 10 minutes. If initially there are 600 number of nuclei, the time taken (in minutes) for the disintegration of 450 nuclei is

A

15

B

30

C

10

D

20

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NEET 2018 - Question 110

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The volume (V) of a monatomic gas varies with its temperature (T), as shown in the graph. The ratio of work done by the gas, to the heat absorbed by it, when it undergoes a change from state A to state B, is

A

$$\frac{2}{7}$$

B

$$\frac{1}{3}$$

C

$$\frac{2}{3}$$

D

$$\frac{2}{5}$$

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NEET 2018 - Question 111

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The fundamental frequency in an open organ pipe is gers eeeea closed organ pipe.If the length of a closed organ pipe is 20 cm , then the length of closed organ pipe is

A

16 cm

B

12-5cm

C

8 cm

D

13-2cm

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NEET 2018 - Question 112

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The efficiency of an ideal heat) engine working between the freezing point and boiling point of water,is

A

12.5%

B

6.25%

C

20%

D

26-8%

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NEET 2018 - Question 113

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At what temperature will the rms speed of oxygen molecules become just sufficient for escaping from the; Earth’s atmosphere ?
(Given : Mass of oxygen molecule $$(m) = 2.76 \times 10^{-26} kg)$$
Boltzmann's constant $$k_{B}=1.38 \times 10^{-23} J K^{-1}$$

A

$$1.254 \times 10^{4}$$ K

B

$$5.016 \times 10^{4}$$ K

C

$$8.360 \times 10^{4}$$ K

D

$$2.508 \times 10^{4}$$ K

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NEET 2018 - Question 114

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Unpolarised light is incident from air on a plane surface of a material of refractive index $$\mu$$. At a particular angle of incidence ‘i’, it is found that the reflected and refracted rays are perpendicular to each other. Which of the following options is correct for this situation ?

A

$$i= \tan^{-1} \left(\frac{1}{\mu}\right)$$

B

$$i= \sin^{-1} \left(\frac{1}{\mu}\right)$$

C

Reflected light is polarised with its electric vector perpendicular to the plane of incidence

D

Reflected light is polarised with its electric vector parallel to the plane of incidence

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NEET 2018 - Question 115

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In Young’s double slit experiment the separation d between the slits is 2 mm, the wavelength $$\lambda$$ of the light used is 5896 A and distance D between the screen and slits is 100 cm.It is found that the angular width of the fringes is $$0-20^\circ$$ To increase the fringe angular width to $$0.21^\circ$$ (with same $$\lamda$$ and D) the seaparation between the slits needs to be changed to

A

1.7 mm

B

2.7 mm

C

1.9 mm

D

1.8 mm

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NEET 2018 - Question 116

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An astronomical, refracting telescope will have large angular magnification and high angular resolution, when it has an objective lens of

A

small focal length and small diameter

B

large focal length and large diameter

C

large focal length and small diameter

D

small focal length and large diameter

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NEET 2018 - Question 117

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In the circuit shown in the figure, the input voltage $$v_{i}$$ is 20 V , $$V_{BE}$$=0 and $$V_{CE}$$=0 The values of $$I_{B},I_{C},\beta$$ are given by

A

$$I_{B}=40 \mu A, I_{C}=5 mA,\beta=125$$

B

$$I_{B}=20 \mu A, I_{C}=5 mA,\beta=250$$

C

$$I_{B}=25 \mu A, I_{C}=5 mA,\beta=200$$

D

$$I_{B}=40 \mu A, I_{C}=10 mA,\beta=250$$

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NEET 2018 - Question 118

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In a p-n junction diode, change in temperature dueto heating

A

affects the overall V — I characteristics, of p-n junction

B

does not affect resistance of p-njunction

C

affects only forward resistance

D

affects only reverse resistance

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NEET 2018 - Question 119

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In the combination of the following gates the output Y can be written in terms of inputs A and B as

A

$$\overline{A+B}$$

B

$$\overline{A.B} + A.B$$

C

$$A.\overline{B}+\overline{A}.B$$

D

$$\overline{A.B}$$

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NEET 2018 - Question 120

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A metallic rod of mass per unit length $$0.5 kg m^{-1}$$ is lying horizontally on a smooth inclined plane which makes an angle of $$30^\circ$$ with the horizontal. The rod is not allowed to slide down by flowing a current through it when a magnetic field of induction 0:25 T is acting on it in the vertical direction. The current flowing in the rod to keep it stationary is

A

11:32 A

B

14-76 A

C

5.98 A

D

7.14 A

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NEET 2018 - Question 121

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An inductor 20 mH, a capacitor 100 $$\mu F$$ and a resistor 50 Q are connected in series across a source of emf, $$V = 10 \sin 314 t$$. The powerloss in the circuit is

A

1.13 W

B

2-74 W

C

0.43 W

D

0-79'W

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NEET 2018 - Question 122

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A thin diamagnetic rod is placed vertically between the poles of an electromagnet. When,the current in the electromagnetis switched on, then the diamagnetic rod is pushed up, out,of the horizontal magnetic field. Hence, the rod gains gravitational potential energy. The work required to do this comes from

A

the induced electric field due to the changing magnetic field

B

the lattice structurejof the material of the rod

C

the magnetic field

D

the current source

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NEET 2018 - Question 123

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Current sensitive of a moving coil galvanomieter is 5 $$\frac{div}{mA}$$ and its voltage sensitivity (angular deflection per unit voltage applied ) is 20 $$\frac{div}{V}$$. The resistance of the galvanometer is

A

500 Ω

B

250 Ω

C

25 Ω

D

40 Ω

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NEET 2018 - Question 124

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A tuning fork is used to produce resonance in a glass tube. The length of the air column in this tube can be adjusted by a variable piston. At room temperature of $$27^\circ$$C two successive resonances are produced at 20 cm and 73 cm of column length. If the frequency of the tuning fork is 320 Hz, the velocity of sound in air at $$27^\circ$$C is

A

300 $$\frac{m}{s}$$

B

350 $$\frac{m}{s}$$

C

339 $$\frac{m}{s}$$

D

330 $$\frac{m}{s}$$

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NEET 2018 - Question 125

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The electrostatic force between the metal plates of an isolated parallel plate capacitor C having a charge Q and area A,is

A

inversely proportional to the distance between the plates.

B

proportional to the square root of the distance between the plates.

C

linearly proportional to the distance between the plates.

D

independent of the distance between the plates.

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NEET 2018 - Question 126

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A pendulum is hung from the roof of a sufficiently high building and is moving freely to and fro like a simple harmonic oscillatar. The acceleration of the bob of the pendulum is 20 $$\frac{m}{s^{2}}$$ at a distance of 5 m*fromithe mean position.The time period of oscillation

A

1 S

B

2 S

C

$$\pi$$ S

D

$$2 \pi$$ S

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NEET 2018 - Question 127

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An electron falls from.rest through a vertical distance h in & uniform and vertically upward directed electric,field B. The direction of electric field is now reversed,keeping its magnitude the same. A protonisallowed to fall from rest in it through the'samejvertical distance h. The time of fall of the‘electron, in comparison to the time of fall of the proton is

A

equal

B

10 times greater

C

5 times greater

D

smaller

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NEET 2018 - Question 128

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The kinetic energies of a planet in an elliptical orbit about the Sun, at positions A,B and C are $$K_{A},K_{B}$$ and $$K_{C}$$, respectively AC is the major axis and SB is perpendicular to AC at the position of the Sun S as shown in the figure.Then

A

$$K_{B}>K_{A}> K_{C}$$

B

$$K_{B}<K_{A}< K_{C}$$

C

$$K_{A}>K_{B}> K_{C}$$

D

$$K_{A}<K_{B}<K_{C}$$

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NEET 2018 - Question 129

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A solid sphere is in rolling motion. In rolling motion a body possesses translational kinetic energy $$(K_{t})$$ as well as rotational kinetic energy $$(K_{r})$$ simultaneously.The ratio $$K_{t}:(K_{t}+K_{r})$$ for the sphere is

A

2:5

B

10:7

C

5:7

D

7:10

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NEET 2018 - Question 130

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If the mass of the Sun were tem times,smaller and the universal gravitational constant were ten times larger in magnitude , which of the following is not correct?

A

‘g’on the Earth will not change.

B

Time period of a simple pendulum on the Earth would decrease.

C

Walking on the’ground would become more difficult.

D

Raindrops will fall faster.

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NEET 2018 - Question 131

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A solid sphereis) rotating freely about its symmetry axis in, free space. The radius of the sphere is imcreased keeping its mass same. Which of the following physical quantities would remain constant for the sphere ?

A

Angular momentum

B

Rotational kinetic energy

C

Moment of inertia

D

Angular velocity

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NEET 2018 - Question 132

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A body initially at rest and sliding along a frictionless track from a height h (as shown in Figure),just completes a vertical circle of diameter AB=D.The height h is equal to

A

$$\frac{5}{4}$$ D

B

$$\frac{7}{4}$$ D

C

D

D

$$\frac{3}{2}$$ D

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NEET 2018 - Question 133

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Three objects, A : (a solid sphere), B : (a thin circular disk) and C : (a circular ring), each have the same mass M and radius R. Theyall spin with the same angular speed about their own symmetry axes. The amounts of work (W) required to bring them to rest, would satisfy the relation

A

$$W_{A}>W_{C}>W_{B}$$

B

$$W_{B}>W_{A}>W_{C}$$

C

$$W_{A}>W_{B}>W_{C}$$

D

$$W_{C}>W_{B}>W_{A}$$

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NEET 2018 - Question 134

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Which one of the following statements is incorrect ?

A

Coefficient of sliding friction has dimensions of length

B

Frictional force opposes the relative motion.

C

Limiting value of static friction is directly proportional to normal reaction.

D

Rolling friction is smaller than sliding friction

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NEET 2018 - Question 135

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A moving block having mass m, collides with another stationary block having mass 4m. The lighter blockycomesto rest after collision. When the initial velocity of the lighter block is v, then the value.of coefficient of restitution (e) will be

A

0.4

B

0.8

C

0.25

D

0.5

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NEET 2018 - Question 136

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Iron carbonyl,$$Fe(CO)_{5}$$ is

A

dinuclear

B

trinuclear

C

mononuclear

D

tetranuclear

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NEET 2018 - Question 137

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Match the metal ions given in Column I with the spin magnetic moments of the ions given in Column II and assign the correct code :

A

a-iii, b-v, c-i, d-ii

B

a-iv, b-i, c-ii, d-iii

C

a-i, b-ii, c-iii, d-iv

D

a-iv, b-v, c-ii, d-i

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NEET 2018 - Question 138

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Which of the following ions exhibits d-d transistion and paramagnetism as well?

A

$${MnO_{4}}^{2-}$$

B

$${MnO_{4}}^{-}$$

C

$$1{Cr_{2}O_{7}}^{-}$$

D

$${CrO_{4}}^{2-}$$

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NEET 2018 - Question 139

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The geometry and magnetic behaviour of the complex $$[Ni(CO)_{4}]$$ are

A

tetrahedral geometry and paramagnetic

B

square planar geometry and paramagnetic

C

tetrahedral geometry and diamagnetic

D

square planar geometry and diamagnetic

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NEET 2018 - Question 140

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The type of isomerism shown by the complex $$[CoCl_{2}(en)_{2}]$$ is

A

Linkage isomerism

B

Ionization isomerism

C

Coordination isomerism

D

Geometrical isomerism

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NEET 2018 - Question 141

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Identify the major products P, Q and R in the following sequence of reactions :

A

B

C

D

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NEET 2018 - Question 142

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Which of the,following compounds can form a zwitterion ?

A

Glycine!

B

Benzoic acid

C

Acetanilide

D

Aniline

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NEET 2018 - Question 143

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For the redox reaction $${MnO_{4}}^{-}+{C_{2}O_{4}}^{2-}+H^{+} \rightarrow {Mn}^{2+}+CO_{2}+H_{2}O $$ the correct coefficients of the reactants for the balanced equation are

A

$$MnO_{4}^{-} - 5, C_2O_{4}^{2-} - 16, H^{+} - 2$$

B

$$MnO_{4}^{-} - 2, C_2O_{4}^{2-} - 16, H^{+} - 5$$

C

$$MnO_{4}^{-} - 2, C_2O_{4}^{2-} - 5, H^{+} - 16$$

D

$$MnO_{4}^{-} - 16, C_2O_{4}^{2-} - 5, H^{+} - 2$$

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NEET 2018 - Question 144

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The correction factor ‘a’ to the ideal gas equation corresponds to

A

forces of attraction between the gas molecules

B

electric field present between the gas molecules

C

volumeofthe gas molecules

D

density of the gas molecules

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NEET 2018 - Question 145

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Which oneof the following conditions will favour maximum formation of the product in the reaction,
$$A_{2} (g)+B_{2} g \rightleftharpoons X_{2}(g) \triangle_{r}H=-XKJ$$

A

High temperature and low pressure

B

High temperature and High pressure

C

Low temperature and low pressure

D

Low temperature and high pressure

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NEET 2018 - Question 146

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The bond dissociation energies of $$X_{2},Y_{2}$$ and XY are in the ratio of 1:0.5:1. $$\triangle H$$ for the formation of XY is — 200 kJ $$mol^{-1}$$ The bond dissociation of energy $$X_{2}$$ will be

A

400 kJ $$mol^{-1}$$

B

800 kJ $$mol^{-1}$$

C

100 kJ $$mol^{-1}$$

D

200 kJ $$mol^{-1}$$

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NEET 2018 - Question 147

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When initial concentration of the reactant is doubled,. the half-life period of a zero order reaction

A

remains unchanged

B

is tripled

C

is doubled

D

is halved

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NEET 2018 - Question 148

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Which of the following molecules represents the order of hybridisation $$Sp_{2},Sp_{2},Sp,Sp $$from the left to right atoms?

A

$$CH_{3}-CH=CH-CH_{3}$$

B

$$CH_{2}=CH-CH=CH_{2}$$

C

$$CH_{2}=CH-C \equiv CH$$

D

$$HC \equiv C-C \equiv CH$$

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NEET 2018 - Question 149

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Which of the following carbocations is expected to be most stable?

A

B

C

D

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NEET 2018 - Question 150

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Which of the followingis correct with respect to — I effect of the substituents ? (R = alkyl)

A

$$-NR_{2}>-OR>-F$$

B

$$-NH_{2}>-OR>-F$$

C

$$-NR_{2}<-OR<-F$$

D

$$-NH_{2}<-OR<-F$$

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NEET 2018 - Question 151

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The correct difference between first- and second-order reactions is that

A

the rate of a first-order reaction does dependon reactant concentrations; the rate of a second-order reaction does not depend on reactant concentrations

B

a first-order reaction can be catalyzed; a second-order reaction cannot be catalyzed

C

the half-life of a first-order reaction does not depend on $$[A]_{0}$$ the half-life of a second-order reaction does depend on $$[A]_{0}$$

D

the rate of a first-order reaction does not depend on reactant concentrations; the rate of a second-order reaction does depend on reactant concentrations

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NEET 2018 - Question 152

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Among $$CaH_{2},BeH_{2},BaH_{2},$$ the order of ionic charecter is

A

$$BaH_{2}<BeH_{2}<CaH_{2}$$

B

$$BeH_{2}<BaH_{2}<CaH_{2}$$

C

$$caH_{2}<BeH_{2}<BaH_{2}$$

D

$$BeH_{2}<caH_{2}<BaH_{2}$$

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NEET 2018 - Question 153

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Consider the change in oxidation state of Bromine corresponding to different emf values as shown in the diagram below:

Then the species undergoing disproportionation is

A

HBrO

B

$$Br_{2}$$

C

$${BrO_{4}}^{-}$$

D

$${BrO_{3}}^{-}$$

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NEET 2018 - Question 154

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In which case is the number of molecules of water maximum ?

A

$$10^{-3}$$ mol of water

B

0.00224 L of water vapours at 1 atm and 273 K

C

0.18 g of water

D

18 mL of water

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NEET 2018 - Question 155

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The compound A on treatment with Na gives B, and with $$PCl_{5}$$ gives C B and C react together to give diethyl ether. A, B and C are in the order

A

$$C_{2} H_{5} OH,C_{2} H_{5} ONa,C_{2} H_{5} Cl$$

B

$$C_{2} H_{5} Cl,C_{2} H_{6},C_{2} H_{5} OH$$

C

$$C_{2} H_{5} OH,C_{2} H_{5} Cl,C_{2} H_{5} ONa$$

D

$$C_{2} H_{5} OH,C_{2} H_{6},C_{2} H_{5} Cl$$

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NEET 2018 - Question 156

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Hydrocarbon (A) reacts with bromine by substitution to form an alkyl bromide which by Wurtz reaction is converted to gaseous hydrocarbon containing less than four carbon atoms.(A)is

A

$$CH_{4}$$

B

$$CH_{3}-CH_{3}$$

C

$$CH_{2}=CH_{2}$$

D

$$CH \equiv CH$$

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NEET 2018 - Question 157

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The compound $$C_{7} H_{8}$$ undergoes the following reactions :

The product 'C' is

A

p-bromotoluene

B

3-bromo-2,4,6-trichlorotoluene

C

o-bromotoluene

D

m-bromotoluene

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NEET 2018 - Question 158

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Which oxide of nitrogen is not a common pollutant introduced into the atmosphere both due to natural and humanactivity ?

A

NO

B

$$N_{2} O$$

C

$$NO_{2}$$

D

$$N_{2}O_{5}$$

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NEET 2018 - Question 159

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A mixture of 2:3 g formic acid and 4.5 g oxalic acid is aon with conic.$$H_{2}SO_{4}$$ The evolved mixture is passes through KOH pellets.Weight (in g) of the remaining product at STP will be

A

4.4

B

2.8

C

3.0

D

1.4

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NEET 2018 - Question 160

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The difference between amylose and amylopectin is

A

Amylose is made up of glucose and galactose

B

Amylopectin have 1 $$\rightarrow$$ 4 $$\alpha$$-linkage and 1 $$\rightarrow$$ 6 $$\beta$$-linkage

C

Amylose have 1 $$\rightarrow$$ 4 $$\alpha$$-linkage and 1 $$\rightarrow$$ 6 $$\beta$$-linkage

D

Amylopectin have 1 $$\rightarrow$$ 4 $$\alpha$$-linkage and 1 $$\rightarrow$$ 6 $$\alpha$$-linkage

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NEET 2018 - Question 161

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Which of the following oxides is most acidic in nature ?

A

CaO

B

BaO

C

BeO

D

MgO

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NEET 2018 - Question 162

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Nitration of aniline in strong acidic medium also gives m-nitroaniline because

A

In acidic (strong) medium aniline is present as anilinium ion.

B

In absence of substituents nitro group always goes to m-position.

C

In electrophilic substitution reactions amino group is meta directive.

D

In spite of substituents nitro group always goes to only m-position.

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NEET 2018 - Question 163

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Regarding cross-linked or network polymers,which of the following statements is incorrect ?

A

They contain strong covalent bonds in their polymer chains.

B

Examples are bakelite and melamine.

C

They are formed from bi- and tri-functional monomers.

D

They contain covalent bonds between various linear polymerchains.

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NEET 2018 - Question 164

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Following solutions were prepared by mixing different volumes of NaOH and HClof different Concentration

A

$$60 mL \frac{M}{10} HCl+40 mL \frac{M}{10} NaOH$$

B

$$55 mL \frac{M}{10} HCl+45 mL \frac{M}{10} NaOH$$

C

$$75 mL \frac{M}{5} HCl+25 mL \frac{M}{5} NaOH$$

D

$$100 mL \frac{M}{10} HCl+100 mL \frac{M}{10} NaOH$$

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NEET 2018 - Question 165

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On which of the following properties does the coagulating powerofan ion depend ?

A

The sign of charge on she ion alone

B

Both magnitude and sign of the charge on the ion

C

Size of the ion alone

D

ao magnitude of the charge on the ion alone

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NEET 2018 - Question 166

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The solubility of $$BaSO_{4}$$ in water is $$2.42 \times 10^{-3} gL^{-1}$$ at 298K. The value of its solubility product $$(K_{sp})$$ will be
(Given molar mass of $$BaSO_{4} = 233 g mol^{-1}$$

A

$$1.08 \times 10^{-8} mol^{2} L^{-2}$$

B

$$1.08 \times 10^{-14} mol^{2} L^{-2}$$

C

$$1.08 \times 10^{-12} mol^{2} L^{-2}$$

D

$$1.08 \times 10^{-10} mol^{2} L^{-2}$$

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NEET 2018 - Question 167

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Given van der)Waals constant for $$NH_{3}, H_{2},O_{2} and CO_{2}$$ respectively 4.17, 0.244, 1.36 and 3.59, which ‘one»of the following gases is most easily liquefied, ?

A

$$CO_{2}$$

B

$$O_{2}$$

C

$$H_{2}$$

D

$$NH_{3}$$

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NEET 2018 - Question 168

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Magnesium reacts with an element (X) to form an ionic compound. If the ground state electronic configuration of (X) is $$1s^{2} 2s^{2} 2p^{3}$$, the simplest formula for this compoundis

A

$$Mg_{3}X_{2}$$

B

$$Mg_{2} X$$

C

$$MgX_{2}$$

D

$$Mg_{2}X_{3}$$

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NEET 2018 - Question 169

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Iron exhibits bee structure at room temperature. Above $$900^\circ$$C , it transforms to fcc structure. The ratio of density of iron at room temperature to that at $$900^\circ$$C (assuming molar mass and atemic radii of iron remains constant with temperature) is

A

$$\frac{1}{2}$$

B

$$\frac{3\sqrt{3}}{4\sqrt{2}}$$

C

$$\frac{4\sqrt{3}}{3\sqrt{2}}$$

D

$$\frac{\sqrt{3}}{\sqrt{2}}$$

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NEET 2018 - Question 170

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Which one is a wrong statement?

A

The value of m for $$d_z2$$ is Zero

B

C

An orbital is deseby three quantum numbers while.an electron in an atom is designated byfourquantum numbers.

D

Total orbital angular momentum of electron is S orbital equal to Zero

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NEET 2018 - Question 171

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Consider the following species
$${CN}^{+},{CN}^{-},NO and CN$$
Which one of these will have the highest bond order?

A

CN

B

$${CN}^{+}$$

C

$${CN}^{-}$$

D

NO

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NEET 2018 - Question 172

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Which ofthe following statements is not true for halogens ?

A

Chlorine has the highest electron-gain enthalpy.

B

All but fluorine show positive oxidation states.

C

All are oxidizing agents.

D

All form monobasic oxyacids.

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NEET 2018 - Question 173

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Which one of the following elements is unable to form $${MF_{6}}^{3-}$$ ion ?

A

ln

B

B

C

Al

D

Ga

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NEET 2018 - Question 174

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In the structure of $$ClF_{3}$$ the number of lone pairs of electrons on central atom ‘Cl’ is

A

three

B

four

C

two

D

one

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NEET 2018 - Question 175

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Considering Ellingham diagram, which of the following metals can be used to reduce alumina ?

A

Cu

B

Mg

C

ZN

D

Fe

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NEET 2018 - Question 176

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The correct order of atomicradi in group 13 elements is

A

B < Ga < Al < ln < TI

B

B < Ga < Al < Ti < ln

C

B < Al < Ga < ln < TI

D

B < Al < ln < Ga < TI

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NEET 2018 - Question 177

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The correct’ orner of N-compounds in its decreasing order of oxidation states is

A

$$NH_{4}Cl,N_{2},NO,HNO_{3}$$

B

$$HNO_{3},NH_{4}Cl,NO,N_{2}$$

C

$$HNO_{3},NO,NH_{4}Cl,N_{2}$$

D

$$HNO_{3},NO,N_{2},NH_{4}Cl,$$

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NEET 2018 - Question 178

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In the reaction

the electrophile involved is

A

dichlorocarbene (:CCl_{2})

B

figure2

C

figure3

D

figure4

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NEET 2018 - Question 179

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Carboxylic acids have higher boiling points than aldehydes, ketones and even alcohols of comparable molecular mass.It is due to their

A

formation of intermolecular H-bonding

B

more extensive association of carboxylic acid via vander Walls force of attraction

C

formation of carboxylate ion

D

formation of intramolecular H-bonding

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NEET 2018 - Question 180

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Compound A, $$C_{8}H_{10}O$$, is found to react with NaOI(produced by reacting Y with NaOH) and yields a yellow precipitate with charecteristic smell.
A and Y are respectively

A

B

C

D

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