NEET Physics: Questions 695 - 699 of 2142

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Question number: 695

MCQ▾

Question

Core of a transformer can’t be made up of

(1) Steel (2) Alnico

(3) Iron (4) Soft iron

Select the correct answers and mark it according to the following

Choices

Choice (4) Response

a.

1, 2 and 3 are correct

b.

2 and 4 are correct

c.

1 and 3 are correct

d.

1 and 2 are correct

Question number: 696

MCQ▾

Question

A 120 Volt ac source is connected across a pure inductor of inductance 0.70 H. If the frequency of the ac source is 60 Hz, the current passing through the inductor is

Choices

Choice (4) Response

a.

4.55 amp

b.

3.55 amp

c.

0.355 amp

d.

0.455 amp

Question number: 697

MCQ▾

Question

Two spheres of masses 2M and M are initially at rest at. Distance R apart. Due to mutual force of attraction, they approach each other. When they are at separation R/2, the acceleration of the center of mass of spheres would be

Choices

Choice (4) Response

a.

0 m/s 2

b.

gm/s 2

c.

12 gm/s 2

d.

3 gm/s 2

Question number: 698

MCQ▾

Question

The instantaneous value of current in an A. C. circuit is . The current will be maximum for the first time at,

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 699

MCQ▾

Question

Two rail tracks, insulated from each other and the ground, are connected to milli voltmeter. What is the reading of the milli voltmeter when a train passes at a speed of 180 km/hr along the track? Given that - the horizontal component of earth’s magnetic field B H is 0.2 x 10 -4 Wb/m 2 and rails are separated by 1 meter.

Choices

Choice (4) Response

a.

1 V

b.

10 mV

c.

l mV

d.

100 mV

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