# NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 749 - 752 of 2320

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## Question number: 749

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MCQ▾

### Question

The magnetic flux passing perpendicular to the plane of the coil and directed into the paper is varying according to the relation , where is in milli-weber and t is in second. Then the magnitude of emf induced in the loop when t = 2 second is-

### Choices

Choice (4)Response

a.

31 mV

b.

19 mV

c.

-6 mV

d.

-14 mV

## Question number: 750

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MCQ▾

### Question

A 20 volt ac is applied to a circuit consisting of a resistance and a coil with negligible resistance. If the voltage across the resistance is 12 V, the voltage across the coil is

### Choices

Choice (4)Response

a.

16 volt

b.

10 volt

c.

6 volt

d.

8 volt

## Question number: 751

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MCQ▾

### Question

A current of 10 A in the primary coil of a circuit is reduced to zero at a uniform rate in 10 -3 second. If the coefficient of mutual inductance is 3H, the induced e. m. f. in the secondary coil will be,

### Choices

Choice (4)Response

a.

30 kV

b.

2 kV

c.

20kV

d.

3 kV

## Question number: 752

Edit
Assertion-Reason▾

### Assertion (Ꭺ)

The center of mass of a system of n particles is the weighted average of the position vector of the n particles making up the system.

### Reason (Ꭱ)

The position of the center of mass of a system is independent of coordinate system.

### Choices

Choice (4)Response

a.

Ꭺ is false but Ꭱ is true

b.

Both Ꭺ and Ꭱ are false

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

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