NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1285 - 1289 of 2184

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Question number: 1285

» Properties of Solids & Liquids » Hooke's Law

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MCQ▾

Question

A wire of length l m and area of cross section 4 × 10 -8 m 2 increases in length by 0.4 cm when a force of 14 N is applied. Value of Y for the material of the wire will be

Choices

Choice (4) Response

a.

8.75 × l0 6 N/m 2

b.

2.56 × 10 11 N/m 2

c.

2.46 × l0 11 N/mm 2

d.

7.23 × 10 11 kg/m 2

Question number: 1286

» Properties of Solids & Liquids » Surface Energy and Surface Tension

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Question

A thin metal disc of radius r floats on water surface and bends the surface downwards along the perimeter making an angle 9 with vertical edge of the disc. If the disc displaces a weight of water W and surface tension of water is T, then the weight of metal disc is

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 1287

» Wave Optics » Wavefront

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Question

When a mica sheet (µ = 1.6) of thickness 7 microns is placed in the path of one of interfering beams in the biprism experiment then the central fringe gets shifted at the position of seventh bright fringe. The wavelength of light used will be –

Choices

Choice (4) Response

a.

4000Å

b.

6000 Å

c.

7000 Å

d.

5000 Å

Passage

Read the passage given below and answer the questions that follows:

In the figure n mole of a monoatomic ideal gas undergo the process ABC as shown in the P-V diagram. The process AB is isothermal and BC is isochoric. The temperature of the gas at A is T 0. Total heat given to the gas during the process ABC is measured to be Q.

Graph of pressure vs volume (2V and 6V)

Graph of Pressure vs Volume (2V and 6V)

In above figure we show expansion of monoatomic molecule with change in pressure.

Question number: 1288 (1 of 3 Based on Passage) Show Passage

» Thermodynamics » Laws of Thermodynamics » Second Law of Thermodynamics

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Question

Temperature of the gas at C is equal to

Choices

Choice (4) Response

a.

3T 0

b.

T 0

c.

2T 0

d.

6T 0

Question number: 1289 (2 of 3 Based on Passage) Show Passage

» Thermodynamics » Thermal Equilibrium

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Question

The average molar heat capacity of the gas in process ABC is

Choices

Choice (4) Response

a.

b.

c.

d.