NEET Physics: Questions 714 - 718 of 2098

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Question number: 714

» Experimental Skills » Screw Gauge

MCQ▾

Question

The velocities of three particles of masses 20g, 30g and 50g are 10i, 10j and 10k respectively. The velocity of the center of mass of the three particles is

Choices

Choice (4) Response

a.

2i^+30j^+50k^

b.

20i^+30j^+5k^

c.

2i^+3j^+5k^

d.

10i^+10j^+10k^

Question number: 715

» Electromagnetic Induction & Alternating Currents » AC Generator and Transformer

Assertion-Reason▾

Assertion (Ꭺ)

A transformer cannot work on dc supply.

Reason (Ꭱ)

dc changes neither in magnitude nor in direction.

Choices

Choice (4) Response

a.

Ꭺ is true but Ꭱ is false

b.

Ꭺ is false but Ꭱ is true

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

Question number: 716

» Experimental Skills » Vernier Callipers

MCQ▾

Question

Two bodies of masses 2 kg and 4 kg are moving with velocities 2 m/s and 10 m/s respectively along same direction. Then the velocity of their center of mass will be

Choices

Choice (4) Response

a.

7.3 m/s

b.

5.3 m/s

c.

8.1 m/s

d.

6.4 m/s

Question number: 717

» Work, Energy and Power » Work Done

MCQ▾

Question

The work done in lifting water from a well of depth 6 m using a bucket of mass 1.3 kg and volume 1 liter, will be

Choices

Choice (4) Response

a.

135.24 J

b.

105.84 J

c.

147 J

d.

98 J

Question number: 718

» Electromagnetic Induction & Alternating Currents » Self and Mutual Inductance

MCQ▾

Question

If the current in the primary coil is reduced from 3.0 ampere to zero in 0.001 second, the induced e. m. f in the secondary coil is 1500 volt. The mutual inductance of the two coils will be

Choices

Choice (4) Response

a.

0.005 H

b.

0.0005 H

c.

0.05 H

d.

0.5 H

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