# NEET Physics: Questions 714 - 718 of 2142

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## Question number: 714

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: 715

Assertion-Reason▾

### Assertion (Ꭺ)

A transformer cannot work on dc supply.

### Reason (Ꭱ)

dc changes neither in magnitude nor in direction.

### 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 but Ꭱ is NOT the correct explanation of Ꭺ

d.

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

## Question number: 716

MCQ▾

### Question

Two bodies of masses 2 kg and 4 kg are moving with velocities 2 m/s and 10 m/s respectively along same direction. Then the velocity of their center of mass will be

### Choices

Choice (4) Response

a.

7.3 m/s

b.

5.3 m/s

c.

8.1 m/s

d.

6.4 m/s

## Question number: 717

MCQ▾

### Question

The work done in lifting water from a well of depth 6 m using a bucket of mass 1.3 kg and volume 1 liter, will be

### Choices

Choice (4) Response

a.

135.24 J

b.

105.84 J

c.

147 J

d.

98 J

## Question number: 718

MCQ▾

### Question

If the current in the primary coil is reduced from 3.0 ampere to zero in 0.001 second, the induced e. m. f in the secondary coil is 1500 volt. The mutual inductance of the two coils will be

### Choices

Choice (4) Response

a.

0.005 H

b.

0.0005 H

c.

0.05 H

d.

0.5 H

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