1

Which of the following is a scalar quantity?

A

Momentum

B

Acceleration

C

Displacement

D

Distance

CORRECT OPTION:
d

2

The diagram above represents the trajectory of a projectile with an initial velocity U. Calculate the time taken to reach the maximum height. (Take g as acceleration due to gravity)

A

Usinθ/2g

B

2Usinθ/g

C

Ucosθ/g

D

2Ucosθ/g

CORRECT OPTION:
e

3

What change in velocity would be produced on a body of mass 4kg if a constant force of 16 N acts on it for2 s?

A

0.5 ms^{-1}

B

2.0ms^{-1}

C

8.0 ms^{-1}

D

32.0 ms^{-1}

CORRECT OPTION:
c

F =

m(v - u)/t; (v - u) =

Ft/m = 8.0

4

Which of the following statements about solid friction is/are correct? I. Friction depends on the nature of the surfaces in contact II. Friction depends on the area of contact III. Friction always acts in the direction of motion.

A

I only

B

II only

C

III only

D

I and II only

CORRECT OPTION:
a

5

A body accelerates uniformly from rest at the rate of 3 ms^{-1} for 8 seconds. Calculate the distance covered by the body during the acceleration.

A

12m

B

24m

C

48m

D

72m

CORRECT OPTION:
e

S = ut + 1/2at^{2} = 0 + 1/2 x 3 x 8^{2}

= 96m

= 96m

6

Which of the following has the same unit as the moment of a force?

A

Force

B

Power

C

Work

D

Momentum

CORRECT OPTION:
c

7

Solid weighs 0.040 N in air and 0.024 N when fully immersed in a liquid of density 800 kg m^{-3}. What is the volume of the solid? (g = 1Oms^{2})

A

2.0 x 10^{-6}m^{3}

B

2.5x10^{-6}m^{3}

C

3.0x10^{-6}m^{3}

D

2.0x 10^{-5}m^{3}

CORRECT OPTION:
a

Upthrust = weight fluid displacement 0.040 - 0.024 = PVg

0.016 = 800 x V x 10

V = 2.0 x 10^{6}

0.016 = 800 x V x 10

V = 2.0 x 10

8

Which of the following will reduce the frequency of oscillation of a simple pendulum?

A

Increasing the mass of the bob

B

Decreasing the mass of the bob

C

Increasing the length of the string

D

Decreasing the length of the string

CORRECT OPTION:
c

9

A force of 20 N applied parallel to the surface of a horizontal table, is just sufficient to make a block of mass 4kg move on the table. Calculate the coefficient of friction between the block and the table. (g = 10ms^{2})

A

0.05

B

0.20

C

0.50

D

0.80

CORRECT OPTION:
c

μ= F/mg = 20/40 = 0.5

10

A barometer can be used in determining the I. height of a mountain II. depth of a mine III. dew point. Which of the following is/are correct?

A

I, II and III

B

II and III only

C

I and III only

D

I and II only

CORRECT OPTION:
d

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