# NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 783 - 787 of 2320

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## Question number: 783

Edit
Assertion-Reason▾

### Assertion (Ꭺ)

An alternating current does not show any magnetic effect.

### Reason (Ꭱ)

Alternating current varies with time.

### 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.

Ꭺ is false but Ꭱ is true

d.

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

## Question number: 784

Edit
MCQ▾

### Question

If linear density of a rod of length 4m varies as λ = 2 + x them the position of the center of gravity of the rod is

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question number: 785

Edit
MCQ▾

### Question

A resistance of 20Ω is connected to a source of an alternating potential V = 220 sin (100πt). The time taken by the current to change from its peak value to r. m. s value is,

### Choices

Choice (4)Response

a.

0.2 sec

b.

2.5 x 10 -3 sec

c.

25 x 10 -3 sec

d.

0.25 sec

## Question number: 786

Edit
MCQ▾

### Question

In an ac circuit . The time required for the current to achieve its peak value will be

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question number: 787

Edit
MCQ▾

### Question

Two bodies of masses 2 kg and 4 kg are moving with velocities 5 m/s and 7 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.

5.66 m/s

c.

6.4 m/s

d.

8.1 m/s

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