# NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 691 - 694 of 2320

Access detailed explanations (illustrated with images and videos) to 2320 questions. Access all new questions we will add tracking exam-pattern and syllabus changes. Unlimited Access for Unlimited Time! View Sample Explanation or View Features.

Rs. 600.00 or

How to register?

## Question number: 691

Edit
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.

-6 mV

b.

-14 mV

c.

19 mV

d.

31 mV

## Question number: 692

Edit
MCQ▾

### Question

The velocities of three particles of masses 10g, 10g and 30g 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: 693

Edit
Assertion-Reason▾

### Assertion (Ꭺ)

Soft iron is used as a core of transformer.

### Reason (Ꭱ)

Area of hysteresis loop for soft iron is small.

### Choices

Choice (4)Response

a.

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

b.

Ꭺ is false but Ꭱ is true

c.

Ꭺ is true but Ꭱ is false

d.

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

## Question number: 694

Edit
MCQ▾

### Question

A closed coil of copper whose area is lm × lm is free to rotate about an axis. The coil is placed perpendicular to a magnetic field of 0.10 Wb/m 2. It is rotated through 180° in 0.01 second. Then (The resistance of the coil is 2.0Ω)

(1) The induced e. m. f. in the coil is 20 V

(2) The induced current in the coil is 10 A

(3) The induced e. m. f. in the coil is 10 V

(4) The induced current in the coil is 20 A

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

### Choices

Choice (4)Response

a.

1 and 3 are correct

b.

1 and 2 are correct

c.

1,2 and 3 are correct

d.

2 and 4 are correct

Developed by: