NEET Physics: Questions 1518 - 1521 of 2142

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Question number: 1518

» Atoms and Nuclei » Radioactivity

MCQ▾

Question

For thorium A = 232 and Z = 90, at the end of some radioactive disintegrations we obtain an isotope of lead with A = 208 and Z = 82. Then the number of α and β particles emitted are,

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 1519

» Thermodynamics » Laws of Thermodynamics » Second Law of Thermodynamics

Assertion-Reason▾

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.

Ꭺ is true but Ꭱ is 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.

Both Ꭺ and Ꭱ are false

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 Equation of its original volume. If Equation , then the rise in temperature,

Choices

Choice (4) Response

a.

530 K

b.

225 K

c.

405 K

d.

375 K

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