1

What is the least possible error encountered when taking measurement with a meter rule?

A

0.1mm

B

1.0mm

C

0.5mm

D

0.2mm

CORRECT OPTION:
c

2

A quantity which requires magnitude and direction to be specified is

A

Temperature

B

Distance

C

Displacement

D

Mass

CORRECT OPTION:
c

Displacement is a vector quantity

3

I Electrical potential, II Torque, III Kinetic Energy, IV Momentum. Which of the quantities listed are vectors?

A

II and IV

B

I and II

C

I and III

D

II and III

CORRECT OPTION:
a

4

Which type of motion do the wheels of a moving car undergo?

A

Vibratory and translational motion

B

Random and translational motion

C

Rotational mand oscillatory motion

D

Translational and rotational motion

CORRECT OPTION:
d

5

A car accelerates uniformly from rest at 3ms^{-2}. its velocity after traveling a distance of 24m is

A

12ms^{-1}

B

144ms^{-1}

C

72ms^{-1}

D

36ms^{-1}

CORRECT OPTION:
a

V^{2} = U^{2} x 2ax

V^{2} = 0 x 2(3)(24)

V^{2} = 144

V = \(\sqrt{144}\)

V = 12ms^{-1}

V

V

V = \(\sqrt{144}\)

V = 12ms

6

Calculate the escape velocity of a satellite launched from the earth's surface if the radius of the earth is 6.4x10^{6}m

A

25.3kms^{-1}

B

4.2kms^{-1}

C

4.0kms^{-1}

D

11.3kms^{-1}

CORRECT OPTION:
d

V_{escape} = \(\sqrt{2gR}\)

V_{escape} = \(\sqrt{2\times10\times6.4\times10^6}\)

V_{escape} = \(\sqrt{128000000}\)

V_{escape} = 11313.7085mS^{-1}

V_{escape} = 11.313kmS^{-1}

V

V

V

V

7

An object of weight 80kg on earth is taken to a planet where acceleration due to gravity is one-third of its value on earth. The weight of the object on the planet is

A

48N

B

12N

C

27N

D

36N

CORRECT OPTION:
c

8

One of the conditions necessary for an object to be in equilibrium when acted upon by a number of parallel forces is that the vector sum of the forces is

A

Average

B

Zero

C

Negative

D

Positive

CORRECT OPTION:
b

9

What happens when three coplanar non-parallel forces are in equilibrium?

A

Their lines of action are parallel.

B

They are represented in magnitude only

C

They are represented in direction only

D

Their lines of action meet at a point

CORRECT OPTION:
d

Conditions for non-parallel coplanar forces

10

An object of mass 20kg is released from a height of 10m above the ground level. The kinetic energy of the object just before it hits the ground is

A

200J

B

4000J

C

2000J

D

500J

CORRECT OPTION:
c

Kinetic Energy = mgh

= 20 x 10 x 10 J

= 2000J

= 20 x 10 x 10 J

= 2000J

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