NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 739 - 744 of 2320

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Passage

Read the passage given below and answer the questions that follow:

A system consists of block A and B each of mass m connected by a light spring as shown in the figure with block B in contact with a wall. The block A compresses the spring by 3mg /k from natural length of spring and then released from rest. Neglect friction anywhere.

Block system with 2 blocks A and B

Block System with 2 Blocks a and B

Question number: 739 (1 of 3 Based on Passage) Show Passage

» Experimental Skills » Screw Gauge

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MCQ▾

Question

Maximum extension in the spring after system loses contact with wall

Choices

Choice (4)Response

a.

b.

c.

d.

None of the above

Question number: 740 (2 of 3 Based on Passage) Show Passage

» Experimental Skills » Screw Gauge

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MCQ▾

Question

Velocity of center of mass of system comprising A ands when block B just loses contact with the wall

Choices

Choice (4)Response

a.

b.

c.

d.

All of the above

Question number: 741 (3 of 3 Based on Passage) Show Passage

» Experimental Skills » Screw Gauge

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MCQ▾

Question

Acceleration of center of mass of system comprising A and B just after A is released is

Choices

Choice (4)Response

a.

3g

b.

3g/2

c.

0

d.

All of the above

Question number: 742

» Electromagnetic Induction & Alternating Currents » Reactance and Impedance

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MCQ▾

Question

An alternating current of frequency is flowing in a circuit containing a resistor of resistance R and a choke of inductance L in series. The impedance of this circuit is

Choices

Choice (4)Response

a.

b.

c.

d.

Question number: 743

» Electromagnetic Induction & Alternating Currents » Alternating Currents

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Assertion-Reason▾

Question

Assertion (Ꭺ)

The alternating current lags behind the emf by a phase angle of , when ac flows through an inductor.

Reason (Ꭱ)

The inductive reactance increases as the frequency of ac source decreases.

Choices

Choice (4)Response

a.

Both Ꭺ and Ꭱ are false

b.

Ꭺ is true but Ꭱ is false

c.

Ꭺ is false but Ꭱ is true

d.

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

Question number: 744

» Experimental Skills » Vernier Callipers

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MCQ▾

Question

A 2 kg body and a 3 kg body are moving along the x-axis. At a particular instant the 2 kg body has a velocity of 3 ms -1 and the 3 kg body has the velocity of 2ms -1. The velocity of the center of mass at that instant is

Choices

Choice (4)Response

a.

5 ms -1

b.

0

c.

1 ms -1

d.

None of the above

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