NEET (2024 Updated)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1339 - 1342 of 5119

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Question 1339

Question MCQ▾

V0 and VE represent the velocities, µ0 and μE the refractive indices of ordinary and extraordinary rays for a doubly refracting crystal. Then

Choices

Choice (4)Response

a.

if the crystal is calcite

b.

if the crystal is quartz

c.

if the crystal is quartz

d.

if the crystal is calcite

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Question 1340

Question MCQ▾

A uniform steel wire of density 7500 kg/m3 is 2.5 m long and weighs 15.6 × 10-3 kg. It extends by 1.25 mm when loaded by 10 kg. Calculate the value of young՚s modulus of elasticity for steel.

Choices

Choice (4)Response

a.

2.3 × 1011 N/m2

b.

19.6 × 1011 N/m2

c.

2.96 × 1011 N/m2

d.

Question does not provide sufficient data or is vague

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Question 1341

Question MCQ▾

In the given diagram, CP represents a wavefront and AO & BP, the corresponding two rays. Find the condition on θ for constructive interference at P between the ray BP and reflected ray OP

Wavefront Diagram with CP as Wavefront

Choices

Choice (4)Response

a.

b.

c.

d.

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Question 1342

Question MCQ▾

One mole of an ideal gas expands at a constant temperature of 300 K from an initial volume of 10 litres to a final volume of 20 litres. The work done in expanding the gas is

(R = 8.31J/mole-K)

Choices

Choice (4)Response

a.

1728 Joules

b.

750 Joules

c.

1500 Joules

d.

3456 Joules

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