NEET Physics: Questions 1357 - 1363 of 2098

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Question number: 1357

» Thermodynamics » Laws of Thermodynamics » Second Law of Thermodynamics

MCQ▾

Question

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.

3456 Joules

b.

1500 Joules

c.

1728 Joules

d.

750 Joules

Passage

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

Angular width of central maximum in the Fraunhoffer-diffraction pattern of a slit is measured. The slit is illuminated by light of wavelength 6000 Å. When, the slit is illuminated by light of another wavelength, the angular width decreases by 30%.

Question number: 1358 (1 of 2 Based on Passage) Show Passage

» Wave Optics » Diffraction Due to a Single Slit Width of Central Maximum

MCQ▾

Question

The wavelength of the light is

Choices

Choice (4) Response

a.

5200 Å

b.

5000 Å

c.

4200 Å

d.

3500 Å

Question number: 1359 (2 of 2 Based on Passage) Show Passage

» Wave Optics » Diffraction Due to a Single Slit Width of Central Maximum

MCQ▾

Question

The same decrease in the angular width of central maximum is obtained when the original apparatus is immersed in a liquid. Find refractive index of the liquid.

Choices

Choice (4) Response

a.

1.23

b.

1.43

c.

2.43

d.

2.2

Passage

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

A bar of cross section A is subjected to equal and opposite tensile forces F at its ends. Consider a plane through the bar making an angle θ with a plane at right angles to the bar as shown in figure.

Figure in A bar cross section with force acting on it

Figure in a Bar Cross Section With Force Acting on It

In above fig we shows that bars cross section which having equal and opposite force, making and angle θ with a plane.

Question number: 1360 (1 of 2 Based on Passage) Show Passage

» Properties of Solids & Liquids » Stress-Strain Relationship

MCQ▾

Question

The shearing stress at the plane, in terms of F, A and θ is

Choices

Choice (4) Response

a.

FcosθA

b.

Fsin2θ2A

c.

Fcos2θ2A

d.

FsinθA

Question number: 1361 (2 of 2 Based on Passage) Show Passage

» Properties of Solids & Liquids » Stress-Strain Relationship

MCQ▾

Question

In the above problem, for what value of θ is the tensile stress maximum?

Choices

Choice (4) Response

a.

90°

b.

45°

c.

30°

d.

Zero

Question number: 1362

» Properties of Solids & Liquids » Temperature

MCQ▾

Question

50 gm of copper is heated to increase its temperature 10°C. If the same quantity of heat is given to 10 gm water, the rise in its temperature is (Specific heat of copper = 420 Joule-kg -1 C -1)

Choices

Choice (4) Response

a.

5°C

b.

8°C

c.

7°C

d.

6°C

Question number: 1363

» Thermodynamics » Concept of Temperature

Assertion-Reason▾

Assertion (Ꭺ)

The specific heat of a gas in an adiabatic process is zero and in an isothermal process is infinite.

Reason (Ꭱ)

Specific heat of a gas is directly proportional to change of heat in system and inversely proportional change in temperature.

Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are false

b.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

c.

Ꭺ is true but Ꭱ is false

d.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

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