MCQ

MCQ 11 Mark

When you kick a stone, you get hurt. Due to which property this happens?

✓
Inertia of stone
B
Velocity of the kick
C
Momentum of the kick
D
Reaction of the stone.

Answer

Correct option: A.

Inertia of stone

(A) Inertia of stone
Explanation:
The property of a body by which it is unable to change its state of rest or of uniform motion by itself, even when some external force is applied on it, is called inertia.

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MCQ 21 Mark

A woman drawing water from a village well, falls backward, when the rope snaps. This is on account of

✓
Newton's third law of motion
B
Newton's law of gravitation
C
Newton's second law of motion
D
Newton's first law of motion

Answer

Correct option: A.

Newton's third law of motion

(A) Newton's third law of motion
Explanation:
To every action, there is an equal and opposite reaction.

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MCQ 31 Mark

Which of the following are vector quantities?

A
Momentum
B
Velocity
C
Force
✓
All of these

Answer

Correct option: D.

All of these

(D) All of these
Explanation:
All those quantities which have magnitude as well as direction are known as vector quantities.

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MCQ 41 Mark

Action-reaction forces

A
act on the same body
✓
act on different bodies
C
act along different lines
D
act in same direction

Answer

Correct option: B.

act on different bodies

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MCQ 51 Mark

A force acts on a body of mass 3 kg such that its velocity changes from 4 msr' to 10 $ms ^{-1}$. The change in momentum of the body is

A
$42 kgms ^{-1}$
B
$2 kgms ^{-1}$
✓
$18 kgms ^{-1}$
D
$14 kgms ^{-1}$

Answer

Correct option: C.

$18 kgms ^{-1}$

(C) $18 kgms ^{-1}$
Explanation:
Mass $= m =3 kg$
Velocity $v _{ t }=4 ms^{-1}$
Velocity $v _2=10 ms^{-1}$
Change in momentum of body
$
\begin{array}{l}
=m v_2-m v_1=m\left(v_2-v_1\right)=3(10-4) \\
=3 \times 6=18 kgms^{-1}
\end{array}
$

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MCQ 61 Mark

The impulse of a body is equal to :

A
rate of change of its momentum
B
change in its momentum
C
the product of force applied on it and the time of application of force.
✓
both (b) and (c).

Answer

Correct option: D.

both (b) and (c).

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MCQ 71 Mark

Inertia is the property of a body by virtue of which the body is:

A
unable to change by itself the state of rest
B
unable to change by itself the state of uniform motion
C
unable to change by itself the direction of motion
✓
unable to change by itself the state of rest or uniform motion.

Answer

Correct option: D.

unable to change by itself the state of rest or uniform motion.

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MCQ 81 Mark

A man is walking from east to west on a rough surface. The force on the man is directed:

✓
from west to east
B
from east to west
C
along the north
D
along the west

Answer

Correct option: A.

from west to east

(A) from west to east
Explanation:
Force of friction always acts in a direction opposite to direction of motion.

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MCQ 91 Mark

The mass of earth is $6 \times 10^{24} kg$ and radius of earth is $6.4 \times 10^8 m$. The magnitude of force between the mass of 1 kg and the earth is :

✓
770 N
B
9.810 N
C
830 N
D
9.790 N

Answer

Correct option: A.

770 N

(A) 9.770 N
Explanation:
Mass of earth $=m_1=6 \times 102 kg$
Mass of the body $=m_2=1 kg$
Radius of earth $= r =6.4 \times 10^{\circ} m$
Universal gravitational constant $= G =6.67 \times 10^{-11} Nm ^2 kg^2$
Force $= F =$ ?
$
\begin{aligned}
F & =\frac{G m_1 m_2}{r^2}=\frac{6.67 \times 10^{-11} \times 6 \times 10^{24} \times 1}{\left(6.4 \times 10^6\right)^2} \\
& =\frac{6.67 \times 6 \times 10^{-11-12+24}}{6.4 \times 6.4} \\
F & =\frac{6.67 \times 6 \times 10}{6.4 \times 6.4} \\
F & =9.770 N
\end{aligned}
$

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