Top 21 JEE Laboratory Experiments

Question 1

In a screw gauge, the zero of the circular scale lies 3 divisions above the horizontal pitch line when their metallic studs are brought in contact. Using this instrument thickness of a sheet is measured. If pitch scale reading is 1 mm and the circular scale reading is 51 then the correct thickness of the sheet is_____ mm.
[Assume least count is 0.01 mm]

A

1.48

B

1.54

C

1.50

D

1.51

Question 2

In a vernier callipers, 50 vernier scale divisions are equal to 48 main scale divisions. If one main scale division= 0.05 mm, then the least count of the vernier callipers is__________ mm.

A

0.05

B

0.02

C

0.002

D

0.005

Question 3

Surface tension of two liquids (having same densities), $$T_{1}$$ and $$T_{2}$$, are measured using capillary rise method utilizing two tubes with inner radii of $$r_{1}$$ and $$r_{2}$$
where $$r_{1} > r_{2}$$. The measured liquid heights in these tubes are $$h_{1}$$ and $$h_{2}$$ respectively. [Ignore the weight of the liquid about the lowest point of miniscus]. The heights $$h_{1}$$ and $$h_{2}$$ and surfaces tensions $$T_{1}$$ and $$T_{2}$$ satisfy the relation :

A

$$h_{1} = h_{2}$$ and $$T_{1} = T_{2}$$

B

$$h_{1} > h_{2}$$ and $$T_{1} < T_{2}$$

C

$$h_{1} < h_{2}$$ and $$T_{1} = T_{2}$$

D

$$h_{1} > h_{2}$$ and $$T_{1} = T_{2}$$

Question 4

When both jaws of vernier callipers touch each other, zero mark of the vernier scale is right to zero mark of main scale $$4^{th}$$ mark on vernier scale coincides with certain mark on the main scale. while measuring the length of a cylinder, observer observes 15 divisions on main scale and $$5^{th}$$ division of vernier scale coincides with a main scale division. Measured length of cylinder is______mm.
(Least count of Vernier calliper= 0.1 mm)

A

15.5

B

15.1

C

15.9

D

15.4

Question 1

Given below are two statements : Statement I : In a vernier callipers, one vernier scale division is always smaller than one main scale division. Statement II : The vernier constant is given by one main scale division multiplied by the number of vernier scale divisions. In the light of the above statements, choose the correct answer from the options given below.

A

Statement I is true but Statement II is false

B

Statement I is false but Statement II is true

C

Both Statement I and Statement II are false

D

Both Statement I and Statement II are true

Question 2

A tiny metallic rectangular sheet has length and breadth of 5 mm and 2.5 mm , respectively. Using a specially designed screw gauge which has pitch of 0.75 mm and 15 divisions in the circular scale, you are asked to find the area of the sheet. In this measurement, the maximum fractional error will be $$\frac{x}{100}$$ where x is __________.

Question 3

The least count of a screw gauge is $$0.01\,mm.$$ If the pitch is increased by $$75\%$$ and number of divisions on the circular scale is reduced by $$50\%,$$ the new least count will be $$\underline{\hspace{2cm}}\times10^{-3}\,mm.$$

Question 1

Identify compound (Z) in the following reaction sequence.

A

B

C

D

Question 2

Identify the product (P) in the following reaction:

A

B

C

D

Question 3

Match List - I with List - II.

Choose the correct answer from the options given below :

A

(A)-(IV), (B)-(III), (C)-(I), (D)-(II)

B

(A)-(II), (B)-(III), (C)-(IV), (D)-(I)

C

(A)-(IV), (B)-(I), (C)-(II), (D)-(III)

D

(A)-(III), (B)-(I), (C)-(IV), (D)-(II)

Question 4

Which among the following aldehydes is most reactive towards nucleophilic addition reactions?

A

B

C

D

Question 5

Identify major product "X" formed in the following reaction :

A

B

C

D

Question 6

Two moles of benzaldehyde and one mole of acetone under alkaline conditions using aqueous NaOH after heating gives $$x$$ as the major product. The number of $$\pi$$ bonds in the product $$x$$ is _____

Question 1

A spectrometer gives the following reading when used to measure the angle of a prism. Main scale reading: $$58.5$$ degree; Vernier scale reading: $$09$$ divisions. Given that $$1$$ division on main scale corresponds to $$0.5$$ degree. Total divisions on the vernier scale are $$30$$ and match with $$29$$ divisions of the main scale. The angle of the prism from the above data

A

$$58.59^\circ$$

B

$$58.77^\circ$$

C

$$58.65^\circ$$

D

$$59^\circ$$

Question 2

$$N$$ divisions on the main scale of a vernier calliper coincide with $$(N+1)$$ divisions of the vernier scale. If each division of main scale is $$a$$ units, then the least count of the instrument is

A

$$a$$

B

$$\frac{a}{N}$$

C

$$\frac{N}{N+1}\times a$$

D

$$\frac{a}{N+1}$$

Question 1

A screw gauge gives the following reading when used to measure the diameter of a wire. Main scale reading: $$0 \, \text{mm}$$. Circular scale reading: 52 divisions. Given that $$1 \, \text{mm}$$ on main scale corresponds to 100 divisions of the circular scale. The diameter of wire from the above data is:

A

$$0.052 \, \text{cm}$$

B

$$0.026 \, \text{cm}$$

C

$$0.005 \, \text{cm}$$

D

$$0.52 \, \text{cm}$$

Question 1

In an experiment the angles are required to be measured using an instrument. $$29$$ divisions of the main scale exactly coincide with the $$30$$ divisions of the vernier scale. If the smallest division of the main scale is half-a-degree $$(= 0.5°)$$, then the least count of the instrument is

A

one minute

B

half minute

C

one degree

D

half degree

Question 1

An experiment is performed to find the refractive index of glass using a travelling microscope. In this experiment distance are measured by

A

a vernier scale provided on the microscope

B

a standard laboratory scale

C

a meter scale provided on the microscope

D

a screw gauage provided on the microscope

Question 2

Shown in the figure below is a meter-bridge set up with null deflection in the galvanometer.
The value of the unknown resistor $$R$$ is

A

$$13.75\ \Omega$$

B

$$220\ \Omega$$

C

$$110\ \Omega$$

D

$$55\ \Omega$$

Question 3

Two full turns of the circular scale of a screw gauge cover a distance of 1 mm on its main scale. The total number of divisions on the circular scale is 50. Further, it is found that the screw gauge has a zero error of $$-0.03$$ mm while measuring the diameter of a thin wire, a student notes the main scale reading of 3 mm and the number of circular scale divisions in line with the main scale as 35. The diameter of the wire is

A

3.32 mm

B

3.73 mm

C

3.67 mm

D

3.38 mm

Question 1

In a metre bridge experiment null point is obtained at $$20$$ cm from one end of the wire when resistance $$X$$ is balanced against another resistance $$Y$$. If $$X < Y$$, then where will be the new position of the null point from the same end, if one decides to balance a resistance of $$4X$$ against $$Y$$?

A

$$50$$ cm

B

$$80$$ cm

C

$$40$$ cm

D

$$70$$ cm

JEE Laboratory Experiments - XI Questions

JEE Laboratory Experiments - XI Questions

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