NEET (NTA-National Eligibility cum Medical Entrance Test) Physics: Questions 1618 - 1622 of 2142

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Question number: 1618

» Oscillations and Waves » Simple Harmonic Motion » Oscillations of a Spring

MCQ▾

Question

A particle of mass m is attached to three identical springs A, B and C each of force constant k. If the particle of mass m is pushed slightly against the spring A and released then the time period of oscillations is

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 1619

» Electronic Devices » Semiconductors

MCQ▾

Question

If N e and Vd be the number of electrons and drift velocity in a semiconductor. When the temperature is increased,

Choices

Choice (4) Response

a.

N e decreases and V d increases

b.

N e and V d increases

c.

N e increases and V d decreases

d.

N e and V d decreases

Question number: 1620

» Oscillations and Waves » Displacement as a Function of Time

MCQ▾

Question

A particle is performing simple harmonic motion along x-axis with amplitude 4 cm and time period 1.2 sec. The minimum time taken by the particle to move from x = 2 cm to x =+ 4 cm and back again is given by,

Choices

Choice (4) Response

a.

0.2 sec

b.

0.6 sec

c.

0.4 sec

d.

0.3 sec

Question number: 1621

» Oscillations and Waves » Simple Harmonic Motion » Energy

MCQ▾

Question

A particle executes simple harmonic motion with a frequency f. The frequency with which its kinetic energy oscillates is

Choices

Choice (4) Response

a.

f

b.

Equation

c.

Equation

d.

Equation

Question number: 1622

» Oscillations and Waves » Simple Harmonic Motion » Force, Velocity, and Acceleration

Assertion-Reason▾

Assertion (Ꭺ)

Consider motion for a mass spring system under gravity, motion of M is not a simple harmonic motion unless Mg is negligibly small.

Reason (Ꭱ)

For simple harmonic motion acceleration must be proportional to displacement and is directed towards the mean position.

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.

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

d.

Ꭺ is true but Ꭱ is false

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