NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 688 - 692 of 2142

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Question number: 688

» Magnetic Effects of Current and Magnetism » Moving Coil Galvanometer

MCQ▾

Question

What is the shape of magnet in moving coil galvanometer to make the radial magnetic field?

Choices

Choice (4) Response

a.

Convex cylindrical

b.

None

c.

Horse shoe magnet

d.

Concave cylindrical

Question number: 689

» Magnetic Effects of Current and Magnetism » Current Loop as Magnetic Dipole

MCQ▾

Question

A current of 30 A is flowing in a vertical straight wire. If the horizontal component of earth’s magnetic field is 2 x 10 -5 tesla then the distance of null point from wire is –

Choices

Choice (4) Response

a.

0.3 m

b.

0.3 cm

c.

0.3 mm

d.

0.9 m

Question number: 690

» Electromagnetic Induction & Alternating Currents » Faraday's Law

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.

19 mV

b.

31 mV

c.

-14 mV

d.

-6 mV

Question number: 691

» Experimental Skills » Screw Gauge

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: 692

» Electromagnetic Induction & Alternating Currents » AC Generator and Transformer

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 false

b.

Ꭺ is true but Ꭱ is false

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

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