NEET Physics: Questions 709 - 713 of 2142

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Question number: 709

MCQ▾

Question

The current in a coil varies with respect to time t as I = 3t 2 + 2t. If the inductance of coil be 10 mH, the value of induced e. m. f. at t = 2 sec will be,

Choices

Choice (4) Response

a.

0.11 V

b.

0.14 V

c.

0.13 V

d.

0.12 V

Question number: 710

MCQ▾

Question

Which of the following is constructed on the principle of electromagnetic induction?

Choices

Choice (4) Response

a.

Galvanometer

b.

Generator

c.

Electric motor

d.

Voltmeter

Question number: 711

MCQ▾

Question

Three identical spheres, each of mass 1 kg are kept in line, touching eacbn0ther, with their centers on a straight line. If their centers are marked P, Q, R respectively, the distance of center of mass of the system from P is

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 712

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.

2 and 4 are correct

b.

1, 2 and 3 are correct

c.

1 and 3 are correct

d.

1 and 2 are correct

Question number: 713

Assertion-Reason▾

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.

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

c.

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

d.

Ꭺ is true but Ꭱ is false

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