NEET Physics: Questions 745 - 749 of 2098

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Question number: 745

» Laws of Motion » Force and Inertia

MCQ▾

Question

A body of mass 50 kg is pulled by a rope of length 8 m on a surface by a force of 108N applied at the other end. The force that is acting on 50 kg mass, if the linear density of rope is 0.5 kg/m will be –

Choices

Choice (4) Response

a.

108 N

b.

92 N

c.

116 N

d.

100 N

Question number: 746

» 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 Φ=3t2+2t+3 , 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.

31 mV

c.

19 mV

d.

-14 mV

Question number: 747

» Electromagnetic Induction & Alternating Currents » Reactance and Impedance

MCQ▾

Question

A 20 volt ac is applied to a circuit consisting of a resistance and a coil with negligible resistance. If the voltage across the resistance is 12 V, the voltage across the coil is

Choices

Choice (4) Response

a.

6 volt

b.

16 volt

c.

8 volt

d.

10 volt

Question number: 748

» Electromagnetic Induction & Alternating Currents » Self and Mutual Inductance

MCQ▾

Question

A current of 10 A in the primary coil of a circuit is reduced to zero at a uniform rate in 10 -3 second. If the coefficient of mutual inductance is 3H, the induced e. m. f. in the secondary coil will be,

Choices

Choice (4) Response

a.

3 kV

b.

2 kV

c.

30 kV

d.

20kV

Question number: 749

» Experimental Skills » Screw Gauge

Assertion-Reason▾

Assertion (Ꭺ)

The center of mass of a system of n particles is the weighted average of the position vector of the n particles making up the system.

Reason (Ꭱ)

The position of the center of mass of a system is independent of coordinate system.

Choices

Choice (4) Response

a.

Ꭺ is true but Ꭱ is false

b.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

c.

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

d.

Both Ꭺ and Ꭱ are false

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