NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 427 - 430 of 2184

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Question number: 427

» Communication System » Bandwidth of Signals

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MCQ▾

Question

In an experiment for measurement of young’s modulus, following readings are taken. Load = 3.00 kg, length = 2.820 m, diameter - 0.041 cm and extension = 0.87. Determine the percentage error in the measurement of Y.

Choices

Choice (4) Response

a.

+ 5.5%

b.

+ 5%

c.

+ 15%

d.

+ 6.5%

Question number: 428

» Laws of Motion » Force and Inertia

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MCQ▾

Question

particle of mass m is moving in a circular path of constant radius r such that its centripetal acceleration ac is varying with time t as ac = k 2 rt 2, where k is a constant. The power delivered to the particle by the force acting on it will be

Choices

Choice (4) Response

a.

mk 2 t 2 r 2

b.

m 2 k 2 t 2 r 2

c.

mk 2 r 2 t

d.

mk 2 t 2 r

Question number: 429

» Electrostatics » Coulomb's Law

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MCQ▾

Question

The charges on two spheres are + 7 μ C and -5 μ C respectively. They experience a force F. If each of them is given an additional charge of -2 μ C, the new force of attraction will be

Choices

Choice (4) Response

a.

F

b.

c.

d.

2F

Question number: 430

» Kinematics » Average Speed and Instantaneous Velocity

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Assertion-Reason▾

Question

Assertion (Ꭺ)

A river is flowing from east to west at a speed of 5m/min. A man on south bank of river, capable of swimming 10 m/min in still water, wants to swim across the river in shortest time. He should swim due north.

Reason (Ꭱ)

For the shortest time the man needs to swim perpendicular to the bank.

Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are 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.

Ꭺ is false but Ꭱ is true