NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 689 - 693 of 2184

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Question number: 689

» Magnetic Effects of Current and Magnetism » Moving Coil Galvanometer

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MCQ▾

Question

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

Choices

Choice (4) Response

a.

None

b.

Horse shoe magnet

c.

Concave cylindrical

d.

Convex cylindrical

Question number: 690

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

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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 cm

b.

0.3 mm

c.

0.9 m

d.

0.3 m

Question number: 691

» Electromagnetic Induction & Alternating Currents » Faraday's Law

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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.

-6 mV

b.

-14 mV

c.

19 mV

d.

31 mV

Question number: 692

» Experimental Skills » Screw Gauge

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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: 693

» Electromagnetic Induction & Alternating Currents » AC Generator and Transformer

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Assertion-Reason▾

Question

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 true but Ꭱ is NOT the correct explanation of Ꭺ

b.

Ꭺ is false but Ꭱ is true

c.

Ꭺ is true but Ꭱ is false

d.

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