# NEET (National Eligibility cum Medical Entrance Test) Physics: Questions 71 - 75 of 2142

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## Question number: 71

MCQ▾

### Question

The frequency of vibration of string is given by v = [Fm] 1/2 Here P is number of segments in the string and l is the length. The dimensional formula for m will be

### Choices

Choice (4) Response

a.

[M L 0 T -1]

b.

[M L -1 T 0]

c.

[M 0 L T -1]

d.

[M 0 L 0 T 0]

## Question number: 72

MCQ▾

### Question

the distance between two particles is decreasing at the rate of 6 m/sec. If these particles travel with same speeds and in the same direction, then the separations increase at the rate of 4 m/s. The particles have speeds as

### Choices

Choice (4) Response

a.

4 m/sec; 1 m/sec

b.

5 m/sec; 1 m/sec

c.

4 m/sec; 2 m/sec

d.

5 m/sec; 2 m/sec

## Question number: 73

MCQ▾

### Question

The percentage errors in the measurement of mass and speed are 2 % and 3 % respectively. How much will be the maximum error in the estimation of the kinetic energy obtained by measuring mass and speed?

### Choices

Choice (4) Response

a.

1%

b.

5 %

c.

8 %

d.

11 %

## Question number: 74

MCQ▾

### Question

The number of significant figures in all the given numbers 25.12, 2009, 4.156 and l. 217 x 10 - 4 is

### Choices

Choice (4) Response

a.

2

b.

3

c.

4

d.

1

## Question number: 75

MCQ▾

### Question

A particle of mass m moves on the x-axis as follows: it starts from rest at t = 0 from the point x - 0 and comes to rest at t = 1 at the point x = 1. No other information is available about its motion at intermediate time (0 < t < 1). If a denotes the instantaneous acceleration of the particle, then

### Choices

Choice (4) Response

a.

A cannot remain positive for all t in the interval 0 < t < l

b.

Must be > 4 at some point or points in its path

c.

Cannot exceed 2 at any point in its path

d.

= 2 at any point in its path.

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