Force and Pressure Test

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Force and Pressure Test - 32

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Weekly Quiz Competition

Question 1
1 / -0

A brick is kept in three different ways on a table as shown in Figure. The pressure exerted by the brick on the table will be

A
maximum in position A

B
maximum in position B

C
maximum in position C

D
equal in all cases.

Solution

$$ P = \frac{F}{A}$$
$$F= mg$$ is same in all the cases
P will maximum when Area (A) is minimum.
Question 2
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Which one of the following forces is a contact force?

A
Force of gravity

B
Force of friction

C
Magnetic force

D
Electrostatic force

Solution

Friction is a surface phenomenon. When two surfaces have irregularities that come in contact they get interlocked preventing them from sliding against each other. So, the frictional force is a contact force dependent on the surface.
Here, option (B) is correct.
Gravitational force, electrostatic force, and magnetic force do not depend on the surface.
Question 3
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What is the impact of balanced forces on an initially stationary object?

A
The object remains at rest

B
The object moves with uniform speed

C
The object moves in the direction of frictional force acting on it

D
The object moves in a direction perpendicular to the surface of contact

Solution

When the forces on an object are equal and in opposite directions, the forces are balanced, and there is no change in motion.
Question 4
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With the increase in the area of contact of an object, the pressure:
(Note : Thrust remains same)

A
Increases

B
Decreases

C
Is not affected

D
None of these

Solution

Since,
$$P = \frac{F}{A}$$
Thus pressure is inversely proportional to area,
$$i.e. \,\,P \propto \frac{1}{A}$$
With the increase in the area of contact of an object the pressure decreases because pressure is inversely proportional to area of contact.
Question 5
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The state of rest or state of motion of a body can be changed by using

A
Pressure

B
Force

C
Heat

D
None of these

Solution

First law of motion:
A body in rest or a body in motion will continue to do that unless and until an external force is applied on it.
Force will accelerate or decelerate a body.
Question 6
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Which of the following is/are true about force

A
Force will always change the magnitude of velocity

B
Force will always change the direction of velocity

C
S.I unit of force is Newton

D
All the above.

Solution

Force does not always changes the magnitude of velocity. Example: Centripetal force, It changes only direction of motion but not magnitude of velocity.
Force does not always change the direction of motion. Example: Linear motion, the friction only reduces the velocity of the body but does not change the direction.
SI unit of force is Newton.
Question 7
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Which force is used by an archer to pull a bow?

A
Muscular force

B
Frictional force

C
Gravitational force

D
Elastic spring force

Solution

The force which is exerted by the help of muscles of the body is called muscular force.It is exerted with the help of contraction and relaxation of muscles.All our body activities like lifting,walking and running are due to muscular forces.
When an archer pull a bow ,he is using the muscles of his arm to pull that bow hence it is an example of muscular force.
Question 8
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Which of the following units is used to measure thrust?

A
Dyne

B
Pascal

C
Newton per meter square

D
Dyne per centimeter

Solution

Force acting on an object perpendicular to the surface is called thrust. Hence, the unit of thrust will be same as that of Force. Its SI unit is "Newton" and in CGS system its unit is "Dyne".

Hence, option A is correct
Question 9
1 / -0

Pressure varies with force (F) as (provided area is same)

A
$$P\propto F$$

B
$$P\propto \dfrac {1}{F}$$

C
$$P\propto F^2$$

D
$$P\propto \dfrac {1}{F^2}$$

Solution

We know, Pressure is the force exerted divided by area.

Pressure $$=\dfrac{force}{Area},$$ When A is consfont,

Pressure is directly proportional to F. ie

$$P\propto F$$
Hence, Option A
Question 10
1 / -0

A force produces translational motion:

A
When the body is free to move and applied force pass through the rotation axis

B
When the body is hindered to move

C
When the body is rigidly fixed

D
When the body is free to move and applied force does not pass through the rotation axis

Solution

For the application of translational motion, the body must be free to move and after applying force, all the particles in that body move with the same velocity. So applied force must pass through the rotation axis otherwise force can rotate the body.

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Re-Attempt Weekly Quiz Competition

Force and Pressure Test - 32

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Force and Pressure Test - 32

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SHARING IS CARING

Question 1

maximum in position A

maximum in position B

maximum in position C

equal in all cases.

Solution

Question 2

Force of gravity

Force of friction

Magnetic force

Electrostatic force

Solution

Question 3

The object remains at rest

The object moves with uniform speed

The object moves in the direction of frictional force acting on it

The object moves in a direction perpendicular to the surface of contact

Solution

Question 4

Increases

Decreases

Is not affected

None of these

Solution

Question 5

Pressure

Force

Heat

None of these

Solution

Question 6

Force will always change the magnitude of velocity

Force will always change the direction of velocity

S.I unit of force is Newton

All the above.

Solution

Question 7

Muscular force

Frictional force

Gravitational force

Elastic spring force

Solution

Question 8

Dyne

Pascal

Newton per meter square

Dyne per centimeter

Solution

Question 9

$$P\propto F$$

$$P\propto \dfrac {1}{F}$$

$$P\propto F^2$$

$$P\propto \dfrac {1}{F^2}$$

Solution

Question 10

When the body is free to move and applied force pass through the rotation axis

When the body is hindered to move

When the body is rigidly fixed

When the body is free to move and applied force does not pass through the rotation axis

Solution

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