NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 713 - 716 of 2184

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Question number: 713

» Experimental Skills » Screw Gauge

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MCQ▾

Question

Choose the wrong statements about the centre of mass of a body

(1) It lies always outside the body

(2) It lies always inside the body

(3) It lies always on the surface of the body

(4) It may lie within, outside or on the surface of the body

Select the correct answers and mark it according to the following codes:

Choices

Choice (4) Response

a.

1 and 2 are correct

b.

1 and 3 are correct

c.

1,2 and 3 are correct

d.

2 and 4 are correct

Question number: 714

» Experimental Skills » Screw Gauge

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Assertion-Reason▾

Question

Assertion (Ꭺ)

The center of mass of a proton and an electron, released from their respective positions remains at rest.

Reason (Ꭱ)

The center of mass remains at rest, if no external force is applied.

Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are false

b.

Ꭺ is true but Ꭱ is false

c.

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

d.

Ꭺ is false but Ꭱ is true

Question number: 715

» Experimental Skills » Screw Gauge

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MCQ▾

Question

The velocities of three particles of masses 20g, 30g and 50g are 10i, 10j and 10k respectively. The velocity of the center of mass of the three particles is

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 716

» Electromagnetic Induction & Alternating Currents » AC Generator and Transformer

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Assertion-Reason▾

Question

Assertion (Ꭺ)

A transformer cannot work on dc supply.

Reason (Ꭱ)

dc changes neither in magnitude nor in direction.

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 but Ꭱ is NOT the correct explanation of Ꭺ

d.

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