NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1520 - 1524 of 2142

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Question number: 1520

» Atoms and Nuclei » Radioactivity

Assertion-Reason▾

Assertion (Ꭺ)

Electron capture occurs more often than positron emission in heavy elements.

Reason (Ꭱ)

Heavy elements exhibit radioactivity.

Choices

Choice (4) Response

a.

Ꭺ is true but Ꭱ is false

b.

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

c.

Ꭺ is false but Ꭱ is true

d.

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

Question number: 1521

» Thermodynamics » Concept of Temperature

MCQ▾

Question

An ideal gas at 25°C is compressed adiabatically to of its original volume. If , then the rise in temperature,

Choices

Choice (4) Response

a.

530 K

b.

225 K

c.

405 K

d.

375 K

Question number: 1522

» Thermodynamics » Thermal Equilibrium

MCQ▾

Question

Two Carnot engines A and B are operated in succession. The first one, A receives heat from a source at r 1 = 700 and rejects to sink at T 2 K. The second engine B receives heat rejected by the first engine and rejects to another sink at r 3 = 300K. If the work outputs of two engines are equal, then the value of T 2 will be

Choices

Choice (4) Response

a.

700 K

b.

500K

c.

300K

d.

550K

Question number: 1523

» Thermodynamics » Thermal Equilibrium

MCQ▾

Question

A gas mixture consists of 4 moles of oxygen and 10 moles argon at temperature T neglecting all vibrational modes, the total internal energy of the system is

Choices

Choice (4) Response

a.

29 RT

b.

25 RT

c.

15 RT

d.

11 RT

Question number: 1524

» Thermodynamics » Laws of Thermodynamics » First Law of Thermodynamics

MCQ▾

Question

In changing the state of thermodynamics from A to B state, dg heat required is Q and the work done by the system is W. Tae change in its internal energy is

Choices

Choice (4) Response

a.

b.

c.

d.

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