# NEET (National Eligibility cum Medical Entrance Test) Physics: Questions 1614 - 1617 of 2142

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## Question number: 1614

MCQ▾

### Question

Three simple harmonic motions in the same direction having the same amplitude a and same period are superposed. If each differs in phase from the next by 45°, then -

(1) The resultant amplitude is , and the phase of the resultant motion relative to the first is 90°

(2) The energy associated with the resulting motion is

(3) Times the energy associated with any single motion

(4) The resulting motion is not simple harmonic

Select the correct answers and mark it according to the following codes:

### Choices

Choice (4) Response

a.

1 and 2 are correct

b.

1 and 3 are correct

c.

1, 2 and 3 are correct

d.

2 and 4 are correct

## Question number: 1615

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: 1616

MCQ▾

### Question

The displacement x (in meters) of a particle performing simple harmonic motion is related to time t (in seconds) as . 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: 1617

MCQ▾

### Question

The displacement of a particle executing S. H. M is given by 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

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