NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1520 - 1523 of 2184

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Question number: 1520

» Thermodynamics » Laws of Thermodynamics » Second Law of Thermodynamics

Edit
Assertion-Reason▾

Question

Assertion (Ꭺ)

A room can be warmed by opening the door of a refrigerator in a closed room

Reason (Ꭱ)

Head flows from lower temperature (refrigerator) to higher temperature (room).

Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are false

b.

Ꭺ is false but Ꭱ is true

c.

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

d.

Ꭺ is true but Ꭱ is false

Question number: 1521

» Atoms and Nuclei » Radioactivity

Edit
Assertion-Reason▾

Question

Assertion (Ꭺ)

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

Reason (Ꭱ)

Heavy elements exhibit radioactivity.

Choices

Choice (4) Response

a.

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

b.

Ꭺ is true but Ꭱ is false

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: 1522

» Thermodynamics » Concept of Temperature

Edit
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.

225 K

b.

375 K

c.

405 K

d.

530 K

Question number: 1523

» Thermodynamics » Thermal Equilibrium

Edit
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.

550K

c.

300K

d.

500K