NEET Physics: Questions 1616 - 1620 of 2099

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Question number: 1616

» Electronic Devices » Semiconductors

MCQ▾

Question

Let N h and N e be the number of holes and conduction electrons respectively in a semiconductor. Then

Choices

Choice (4) Response
a.

N e > N h in an intrinsic semiconductor

b.

N h= N e in an extrinsic semiconductor

c.

N h= N e in an intrinsic semiconductor

d.

N h > N e in an intrinsic semiconductor

Question number: 1617

» Oscillations and Waves » Periodic Motion - Period Frequency

MCQ▾

Question

The displacement x (in meters) of a particle performing simple harmonic motion is related to time t (in seconds) as x=0.05cos[4πt+π4] . The frequency of the motion will,

Choices

Choice (4) Response
a.

1.0 Hz

b.

1.5 Hz

c.

0.5 Hz

d.

2.0 Hz

Question number: 1618

» Oscillations and Waves » Displacement as a Function of Time

MCQ▾

Question

The displacement of a particle executing S. H. M is given by y=0.65sin400t meters.

The maximum speed of the particle and amplitude of the motion is,

Choices

Choice (4) Response
a.

100 m/s and 1.30 m

b.

260 m/sec and 0.65 m

c.

250 m/s and 0.65 m

d.

200 cm/sec, and 0.65 m

Question number: 1619

» 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.

2πm2k

b.

2πmk

c.

2π2mk

d.

2πm3k

Question number: 1620

» 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

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