NEET (National Eligibility cum Medical Entrance Test) Physics: Questions 781 - 786 of 2142

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Question number: 781

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: 782

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.

0.25 sec

b.

0.2 sec

c.

2.5 x 10 -3 sec

d.

25 x 10 -3 sec

Question number: 783

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: 784

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.

5.66 m/s

b.

6.4 m/s

c.

8.1 m/s

d.

7.3 m/s

Question number: 785

MCQ▾

Question

In a circuit, the value of alternating current is measured by hot wire ammeter as 10 ampere. Its peak value will be

Choices

Choice (4) Response

a.

20 A

b.

14.14 A

c.

7.07 A

d.

10 A

Question number: 786

MCQ▾

Question

Two blocks of mass m = 1 kg and M = 2 kg are in contact on a frictionless table. A horizontal force F (= 3N) is applied to m. The force of contact between the blocks, will be

Choices

Choice (4) Response

a.

4N

b.

IN

c.

2N

d.

5N

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