Forces and Laws of Motion Test

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Forces and Laws of Motion Test - 25

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Question 1
1 / -0

A vehicle is moving on a rough road in a straight line with uniform velocity. Then

A
no force is acting on the vehicle

B
an external force must act on the vehicle

C
an acceleration is being produced in the vehicle

D
no work is being done on the vehicle

Solution

When a vehicle is moving on a rough road, friction acts on it in the opposite direction of its velocity which tends to retard its motion. To be able to move with uniform velocity, an external force must act on the vehicle which can overcome the friction.
Question 2
1 / -0

A force acts on an object which is free to move. If we know the magnitude of the force on the object and the mass of the object, Newton's 2nd law of motion enables us to determine the object's :

A
weight

B
speed

C
acceleration

D
position

Solution

According to Newton's second law,
$$ \sum F= ma$$
According to the question given,
If $$F$$ and $$m$$ is given then by using above equation we can find acceleration of an object.
Option C.
Question 3
1 / -0

A and B are two objects with masses 6 kg and 34 kg respectively. Then,

A
A has more inertia than B

B
B has more inertia than A

C
A and B both have same inertia

D
None of the above statements is true

Solution

Mass is that quantity that is solely dependent upon the inertia of an object. The more inertia that an object has, the more mass that it has. A more massive object has a greater tendency to resist changes in its state of motion.
So option B is correct. Because B has more mass.
Question 4
1 / -0

A stone is tied to the middle of a string and suspended from one end as shown in the given figure. Here S is the stone and O is the point of suspension. If you give a sharp jerk at P, the string will break :

A
below the stone

B
at the point P itself

C
from above the stone

D
nothing can be decided

Solution

When we give a quick downward jerk to the bottom string, we exceed the breaking tension in the bottom string in a very short time. Because of the inertia of the stone, we cannot accelerate it significantly, and the tension in the top string does not increase significantly above initial value. Therefore, the bottom string breaks, and the stone remains hanging from the top string.
Option A is correct.
Question 5
1 / -0

If you are asked to push an object so that the acceleration produced in it has to be twice as before, then the force required will be :

A
Twice as before

B
Half as before

C
Same as before

D
Four times as before

Solution

By Newton's second law,
$$ F= ma$$
So, for twice acceleration,
$$a' = 2a$$
$$\Rightarrow F' = ma'$$
$$\Rightarrow F' = 2ma$$
$$\Rightarrow F' = 2F$$
So required force is twice as before.
Question 6
1 / -0

The law which gives a quantitative measurement of force is :

A
Newton's third law of motion

B
Newton's first law of motion

C
Newton's second law of motion

D
Newton's law of gravitation

Solution

Newton's second law states that rate of change of momentum is directly proportional to applied force.
We can further state that, $$ F = ma$$
From this, we can measure force acting on mass 'm', having acceleration a.
So, option C is orrect.
Question 7
1 / -0

A cricket player while taking a catch lowers his hands to :

A
increase time of impulse

B
decrease time of impulse

C
take catch safely

D
increase the area of impact

Solution

Force acting on the hand $$F = \dfrac{\Delta P}{\Delta t}$$
Thus a player, by lowering his hand, increases the time of impulse so as to decrease the force acting on his hand by the ball which prevents him from injury.
Question 8
1 / -0

$$P$$ and $$Q$$ are two objects with masses $$5 kg$$ and $$30\ kg$$ respectively. Then:

A
$$P$$ has more inertia than $$Q$$

B
$$Q$$ has more inertia than $$P$$

C
$$P$$ and $$Q$$ have the same inertia

D
Neither $$P$$ nor $$Q$$ has any inertia

Solution

The mass of an object is a measure of its inertia.
Given,
Mass of the object $$P$$, $$m_p=5\ kg$$
Mass of the object $$Q$$, $$m_q=30\ kg$$
$$m_q \gt m_p$$
$$\therefore$$ $$Q$$ has more inertia than $$P$$
Question 9
1 / -0

The process of walking involves:

A
Newton's first law of motion

B
Newton's second law of motion

C
Newton's third law of motion

D
None of these

Solution

Newtons' third law of motion states that every action has an equal and opposite reaction.
While walking, the man applies a force on the ground in a backward direction, and thus the ground pushes the man by the same amount of force in the forwarding direction which makes the man move forward.
Question 10
1 / -0

Which of the following represents the SI unit of force?

A
Dyne

B
Gram-weight

C
Newton

D
Kilogram-weight

Solution

Option C is correct.

$$ F= ma$$
In S.I unit system,
unit of force is $$kg\ m/s^2= Newton$$
S.I unit of Force is newton and it is represented by $$N$$.

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Forces and Laws of Motion Test - 25

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Forces and Laws of Motion Test - 25

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SHARING IS CARING

Question 1

no force is acting on the vehicle

an external force must act on the vehicle

an acceleration is being produced in the vehicle

no work is being done on the vehicle

Solution

Question 2

weight

speed

acceleration

position

Solution

Question 3

A has more inertia than B

B has more inertia than A

A and B both have same inertia

None of the above statements is true

Solution

Question 4

below the stone

at the point P itself

from above the stone

nothing can be decided

Solution

Question 5

Twice as before

Half as before

Same as before

Four times as before

Solution

Question 6

Newton's third law of motion

Newton's first law of motion

Newton's second law of motion

Newton's law of gravitation

Solution

Question 7

increase time of impulse

decrease time of impulse

take catch safely

increase the area of impact

Solution

Question 8

$$P$$ has more inertia than $$Q$$

$$Q$$ has more inertia than $$P$$

$$P$$ and $$Q$$ have the same inertia

Neither $$P$$ nor $$Q$$ has any inertia

Solution

Question 9

Newton's first law of motion

Newton's second law of motion

Newton's third law of motion

None of these

Solution

Question 10

Dyne

Gram-weight

Newton

Kilogram-weight

Solution

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