Force and Pressure Test

Result

Force and Pressure Test - 31

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
1 / -0

When you and your friend pushed heavy table in the same direction, it becomes easier to move. This is because:

A
The net force is the sum of forces.

B
The net force is the difference of force.

C
The net force is division of forces.

D
The net force is multiplication of forces.

Solution

If two forces act on an object in the same direction, the net force is equal to the sum of the two forces. This always results in a stronger force than either of the individual forces alone.

Hence, the net force is the sum of forces.
$$F_{net}=F_1+F_2$$
Question 2
1 / -0

The $$SI$$ units of Force are _____ or _____.

A
$$kg \ m/s,\ N$$

B
$$kg\ m/s^2, \ Ne$$

C
$$kg\ km/hr$$, Newton

D
$$kg\ m/s^2, \ N$$

Solution

$$F = ma$$,
So the $$SI$$ unit of force = $$(SI\ \text{unit of }\ m).(SI \ \text{unit of}\ a) = kg \ m/s^2$$ or Newton $$(N)$$
Question 3
1 / -0

Select the correct alternative:
A force does not change.

A
Mass

B
Length

C
Shape

D
State of motion

Solution

A force acting on the body can change its shape, size and also state of motion. As the force acting upon an object is increased, the acceleration of the object is increased (Newton’s 2^nd Law). But it can never change the mass of the body, which is always constant.
Question 4
1 / -0

Which of the following is not an effect of force?

A
Change in the direction of an object

B
Change in the shape and size of an object

C
Change in the mass of an object

D
Change in the position of a stationary object

Solution

Force causes the change in direction of an object. The change in shape or size is done by stress and strain which depends upon force. The change in position of a stationary object is also due to force.
But force cannot change the mass of an object. Hence, the correct answer is option (C).
Question 5
1 / -0

Which is much easier to burst an inflated balloon. When the same force is applied

A
Needle

B
Finger

C
Both are the same

D
Can't say

Solution

Pressure = $$\dfrac{Force}{Area}$$,
It means lesser the area more the pressure.
Now, if we apply the same force by needle and by finger, more pressure will be applied on the inflated balloon in case of the needle as the needle has less area of contact than the finger.
Question 6
1 / -0

During dry weather, while combing hair, sometimes we experience hair flying apart. The force responsible for this is

A
force of gravity.

B
electrostatic force.

C
force of friction.

D
magnetic force.

Solution

When two objects are rubbed together, there is exchange of electrons.

During dry weather, the hair follicles are straightened up and they have picked up electrons during the rubbing process. The follicles have the like charges that repel each each other.

The force responsible for this is the $$\text{electrostatic force}$$.
Question 7
1 / -0

Given figure shows a man with a parachute. Name the force which is responsible for his downward motion. Will he come down with the same speed without the parachute?

A
Force of gravity, No

B
Air resistance, No

C
Air resistance, Yes

D
Force of gravity, Yes

Solution

For a freely falling man, downward acceleration is equal to the acceleration due to the gravity.
However, in the given scenario man is falling with a parachute. Due to this, another force acting on the parachutist is air resistance, opposing the downward motion of the object. Hence, downward acceleration is reduced and net speed is less than the value without the parachute.
Question 8
1 / -0

While sieving grains, small pieces fall down. Which force pulls them down?

A
Coulomb force

B
Gravitational force

C
Nuclear force

D
Electrostatic force

Solution

This is due to Force of gravity that the sieving Grains fall down.
This is due the attraction of the earth that it pulls small grains, while sieving.
Question 9
1 / -0

A girl stands on a box having 60 cm length, 40 cm breadth and 20 cm width in three ways. The pressure exerted by the box will be:

A
maximum when length and breadth form the base

B
maximum when breadth and width form the base

C
maximum when width and length form the base

D
the same in all the above three cases

Solution

The force exerted by the box on base=Weight of object=$$W$$
The pressure that it exerts on the base$$=\dfrac{W}{A}$$
where $$A$$ is the area of the base.
Hence the pressure is maximum for smallest area of the base, which is when formed by breadth and width.
Question 10
1 / -0

A knife with sharp edge is more effective than a blunt knife because:

A
the pressure increases due to decrease in surface area of contact.

B
the force increases due to decrease in surface area of contact.

C
it's velocity ratio decreases.

D
it gets blunt due to long use.

User

Question Analysis

Correct -
Wrong -
Skipped -

My Perfomance

Score
-
out of -
Rank
-
out of -

Re-Attempt Weekly Quiz Competition

Force and Pressure Test - 31

Result

Force and Pressure Test - 31

Score

-

Rank

-

SHARING IS CARING

Question 1

The net force is the sum of forces.

The net force is the difference of force.

The net force is division of forces.

The net force is multiplication of forces.

Solution

Question 2

$$kg \ m/s,\ N$$

$$kg\ m/s^2, \ Ne$$

$$kg\ km/hr$$, Newton

$$kg\ m/s^2, \ N$$

Solution

Question 3

Mass

Length

Shape

State of motion

Solution

A force acting on the body can change its shape, size and also state of motion. As the force acting upon an object is increased, the acceleration of the object is increased (Newton’s 2nd Law). But it can never change the mass of the body, which is always constant.

Question 4

Change in the direction of an object

Change in the shape and size of an object

Change in the mass of an object

Change in the position of a stationary object

Solution

Question 5

Needle

Finger

Both are the same

Can't say

Solution

Question 6

force of gravity.

electrostatic force.

force of friction.

magnetic force.

Solution

Question 7

Force of gravity, No

Air resistance, No

Air resistance, Yes

Force of gravity, Yes

Solution

Question 8

Coulomb force

Gravitational force

Nuclear force

Electrostatic force

Solution

Question 9

maximum when length and breadth form the base

maximum when breadth and width form the base

maximum when width and length form the base

the same in all the above three cases

Solution

Question 10

the pressure increases due to decrease in surface area of contact.

the force increases due to decrease in surface area of contact.

it's velocity ratio decreases.

it gets blunt due to long use.

User

Question Analysis

My Perfomance

Score

-

Rank

-

Results Announcement on: coming Monday

Stay Tuned: We’ll update you on your result via email or SMS.

A force acting on the body can change its shape, size and also state of motion. As the force acting upon an object is increased, the acceleration of the object is increased (Newton’s 2^nd Law). But it can never change the mass of the body, which is always constant.