Forces and Laws of Motion Test

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Forces and Laws of Motion Test - 54

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Weekly Quiz Competition

Question 1
1 / -0

Select the correct alternative:
A force to be expressed correctly requires.

A
Only the magnitude

B
Only the direction

C
Both the magnitude and direction

D
None of the above

Solution

Force is an external agent (push or pull) which changes the state of motion or rest of an object.
AThe force is a vector quantity as it has both magnitudes as well as direction.
It is expressed as the,
The direction of the force is the same as the direction of the accelerations of the body.
Question 2
1 / -0

The property of inertia is more in :

A
A car

B
A truck

C
A horse cart

D
A toy car

Solution

Answer: $A\, truck$
The property of inertia is directly proportional to the mass of the object.
Question 3
1 / -0

Newton's third law:

A
Defines the force qualitatively

B
Defines the force quantitatively

C
Explains the way a force acts on a body

D
Gives the direction of force.

Solution

Newton's third law explains the way a force acts on a body.
It states that to every action there is always an equal and opposite reaction.
Question 4
1 / -0

A rocket is propelled by a gas which is initially at a temperature of $4000 \ K$ . The temperature of the gas falls to $1000 \ K$ as it leaves the exhaust nozzle. The gas which will acquire the largest momentum
while leaving the nozzle is

A
Hydrogen

B
Helium

C
Nitrogen

D
Argon

Solution

$\text{Momentum}=\text{Mass}\times \text{Velocity}$
Thus, the heavier gas will acquire the largest momentum.
Argon is the heavier gas among the given options. So, it will acquire the largest momentum.
Question 5
1 / -0

Unit of momentum is:

A
Newton metre

B
Newton kg/ metre

C
Newton metre/ sec

D
Newton sec

Solution

According to Newton's second law
$Force$ = $\frac{dP}{dT}$
so $dP=Force\times {dT}$
So unit of $dP$ (Momentum) is $Newton \times sec$
Question 6
1 / -0

The inertia of a body depends on:

A
The centre of gravity of a body

B
Mass of an object

C
Acceleration due to gravity

D
Size of an object

Solution

The mass of an object is a measure of its inertia. Inertia is the natural tendency of an object to resist a change in its state of motion or of rest.
Question 7
1 / -0

The relation between force (F), mass (m) and acceleration (a) is:

A
$F = ma$

B
$m = aF$

C
$a = mF$

D
$ma = \dfrac{1}{F}$

Solution

$F = ma$
Question 8
1 / -0

When a body is acted by a constant force, then which of the following quantities remain constant

A
Velocity

B
Acceleration

C
Momentum

D
None of these

Solution

$F = ma$
For a given body if $F =$ constant then $a =$ constant.
Newton's second law says that when a constant force acts on a massive body, it causes it to accelerate, i.e., to change its velocity, at a constant rate. In the simplest case, a force applied to an object at rest causes it to accelerate in the direction of the force
Question 9
1 / -0

The inertia of a body depends on

A
the velocity of the body

B
acceleration of the body

C
the shape of the body

D
mass of the body

Solution

Inertia of a body is a property of matter by which it remains at rest or in motion in the same straight line unless acted upon by some external force.
It is a measure of mass of body. Hence inertia depends on mass of body.
Question 10
1 / -0

Which of the following vehicle has the least inertia?

A
Bicycle

B
Scooter

C
Car

D
Truck

Solution

A. Bicycle
Inertia of a body is a property of its mass. Larger the mass of a body more is its inertia. Of the given vehicles, a bicycle has the least mass, and hence the least inertia.

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Forces and Laws of Motion Test - 54

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Forces and Laws of Motion Test - 54

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Question 1

Only the magnitude

Only the direction

Both the magnitude and direction

None of the above

Solution

Question 2

A car

A truck

A horse cart

A toy car

Solution

Question 3

Defines the force qualitatively

Defines the force quantitatively

Explains the way a force acts on a body

Gives the direction of force.

Solution

Question 4

Hydrogen

Helium

Nitrogen

Argon

Solution

Question 5

Newton metre

Newton kg/ metre

Newton metre/ sec

Newton sec

Solution

Question 6

The centre of gravity of a body

Mass of an object

Acceleration due to gravity

Size of an object

Solution

Question 7

F=maF = maF=ma

m=aFm = aFm=aF

a=mFa = mFa=mF

ma=1Fma = \dfrac{1}{F}ma=F1​

Solution

Question 8

Velocity

Acceleration

Momentum

None of these

Solution

Question 9

the velocity of the body

acceleration of the body

the shape of the body

mass of the body

Solution

Question 10

Bicycle

Scooter

Car

Truck

Solution

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$F = ma$

$m = aF$

$a = mF$

$ma = \dfrac{1}{F}$