NEET 2018

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 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 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?

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

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 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 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

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 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 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