Force and Pressure Test

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Force and Pressure Test - 15

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Weekly Quiz Competition

Question 1
1 / -0

Use the following information to answer the next question.

Romesh is climbing a mountain. While climbing, he continuously takes the reading of atmospheric pressure using a barometer.

While climbing, Romesh will most probably observe that the height of the mercury column in the barometer

A
keeps decreasing

B
keeps increasing

C
increases first and then decreases

D
decreases first and then increases

Solution

Atmospheric pressure decreases with increasing height and vice versa. While climbing the mountain, Romesh’s height will gradually increase. As a result, the atmosphere pressure around him will decrease continuously. Hence, the height of the mercury column in the barometer will also keep decreasing.

The correct answer is A.
Question 2
1 / -0

The number of air molecules in the atmosphere decreases with an increase in height and vice versa. This causes

A
an increase in atmospheric pressure with an increase in height

B
a decrease in atmospheric pressure with an increase in height

C
an increase in wind speed with an increase in height

D
a decrease in wind speed with an increase in height

Solution

The force of gravity exerted by air molecules per unit area is known as atmospheric pressure. It does not remain constant because the number of air molecules decreases with increasing height. Hence, the force of gravity and consequently, atmospheric pressure, decreases with an increase in height.

The correct answer is B.
Question 3
1 / -0

Which of the following actions does not involve either push or pull?

A
Drawing water from a well

B
Motion of a horse cart

C
Rusting of an iron rod

D
Making a sharp tool

Solution

Every physical action involves force. A force is categorised as either push or pull. Rusting of iron objects is a chemical action. It is caused by chemical reactions. It does not involve any force, i.e., does not involve either push or pull.

The correct answer is C.
Question 4
1 / -0

Use the following information to answer the next question.

Two forces are acting on an object horizontally. The resultant of the forces is zero.

It can be inferred from the given information that two

A
equal forces are acting on the object in the same direction

B
equal forces are acting on the object in the opposite directions

C
unequal forces are acting on the object in the same direction

D
unequal forces are acting on the object in the opposite directions

Solution

Two forces acting on an object from opposite directions get cancelled out by each other. The resultant of two forces acting on an object horizontally becomes zero if the forces are of equal magnitude and act in the opposite directions.

The correct answer is B.
Question 5
1 / -0

A change in the direction of a moving object results in a change in its

A
size

B
shape

C
state of matter

D
state of motion

Solution

The state of motion of an object is said to be changed if either its speed or its direction (or both) changes. Hence, a change in the direction of a moving object implies a change in its state of motion.

The correct answer is D.
Question 6
1 / -0

Which of the following pairs of forces represents non-contact force?

A
Muscular and frictional

B
Electrostatic and frictional

C
Gravitational and muscular

D
Gravitational and electrostatic

Solution

Gravitational force acts between two objects and it depends on the distance between the objects and their masses. Therefore, gravitational force also acts between two distant objects. Hence, it is a non-contact force.

Electrostatic force exists between two charged objects. This force does not require two objects to be in contact. Hence, it is a non-contact force.

The correct answer is D.
Question 7
1 / -0

Which of the following actions involves a change in size?

A
Heating water to a high temperature

B
Striking a cue ball with a cue stick

C
Stretching the strings of a catapult

D
Hitting a tennis ball with a racket

Solution

The size of an elastic object is changed by the application of forces from opposite directions. A catapult consists of two rubber bands. Rubber is an elastic material. Its shape changes on stretching. Hence, the stretching of the strings of a catapult involves a change in its size.

The correct answer is C.

Question 8

1 / -0

Use the following information to answer the next question.

Three statements regarding the nature of forces.

I The freefalling of a ball involves a contact force.

II The working of a magnetic compass involves a non-contact force.

III Igniting a matchstick involves a non-contact force.

Which two statement(s) is/are incorrect?

I Only

II Only

I and II

I and III

Solution

When a ball is released from a height, it undergoes freefall. This is caused by the gravitational attraction of earth. Gravity is a non-contact force. Hence, statement I is incorrect.

A matchstick is ignited by rubbing or striking its chemical head against the surface of a matchbox. It involves friction between the surfaces of the matchbox and the matchstick. Hence, it is not a non-contact force, it is a contact force. Therefore, statement III is also incorrect.

The correct answer is D.

Question 9
1 / -0

Use the following information to answer the next question.

Inflammable chemicals are glued in the head of a matchstick. When a matchstick is rubbed against the surface of a matchbox, it ignites fire and gets burnt.

Which two forces are involved in the burning of matchsticks?

A
Gravitational and magnetic

B
Muscular and electrostatic

C
Electrostatic and frictional

D
Muscular and frictional

Solution

To rub a matchstick against the surface of a matchbox, muscular force is required. Again, it is the friction between the matchstick and the matchbox which generates the heat sufficient to ignite the stick. Hence, the burning of a matchstick involves muscular and frictional forces. Both the forces are contact forces.

The correct answer is D.
Question 10
1 / -0

Use the following information to answer the next question.

A player kicks hard at a football. It reaches a height and then falls on the ground. The ball comes to a rest after travelling a certain distance along the ground.

Which of the following forces is not involved in the given situation?

A
Muscular force

B
Frictional force

C
Electrostatic force

D
Gravitational force

Solution

Electrostatic force exists between charged bodies. Two charged bodies either repel or attract each other, depending on the nature of charges. There is no charged body involved in the given situation. Hence, electrostatic force is not involved in the given situation.

The correct answer is C.
Question 11
1 / -0

Use the following information to answer the next question.

Pappu takes a bar magnet and freely suspends it from a piece of thread. The magnet comes to a rest along the North-South direction.

Which two forces are acting on the suspended bar magnet?

A
Magnetic and frictional

B
Magnetic and gravitational

C
Frictional and electrostatic

D
Electrostatic and gravitational

Solution

Magnetic force is a non-contact force. Two bodies are not required to be in contact for magnetic force to act. Earth’s magnetic force acts on every magnet. When a magnet is suspended freely, it comes to rest along the North-South direction by the magnetic interaction between earth and the magnet. Hence, magnetic force is acting on the suspended bar magnet.

Earth’s gravity acts on all objects placed on or near its surface. The bar magnet is suspended at a height from the ground. Hence, a gravitational force equal to the weight of the magnet is acting on it downward.

The correct answer is B.

Question 12

1 / -0

Use the following information to answer the next question.

Four actions:

I When pressed, the water present in a rubber dropper rises.

II A nail is pushed into a wall.

III A postcard remains attached to an inverted glass of water.

IV When pressed, a rubber sucker gets attached to a wall.

Which of the following actions is not caused by atmospheric pressure?

I

II

III

IV

Solution

In the case of a nail being pushed into a wall, the area of contact is very small. Therefore, a huge pressure is required to push the nail into the wall. Atmospheric pressure can never be so high that it is able to push a nail into a wall. Therefore, atmospheric pressure does not play any role in action II.

The correct answer is B.

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Force and Pressure Test - 15

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Force and Pressure Test - 15

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SHARING IS CARING

Question 1

keeps decreasing

keeps increasing

increases first and then decreases

decreases first and then increases

Solution

Question 2

an increase in atmospheric pressure with an increase in height

a decrease in atmospheric pressure with an increase in height

an increase in wind speed with an increase in height

a decrease in wind speed with an increase in height

Solution

Question 3

Drawing water from a well

Motion of a horse cart

Rusting of an iron rod

Making a sharp tool

Solution

Question 4

equal forces are acting on the object in the same direction

equal forces are acting on the object in the opposite directions

unequal forces are acting on the object in the same direction

unequal forces are acting on the object in the opposite directions

Solution

Question 5

size

shape

state of matter

state of motion

Solution

Question 6

Muscular and frictional

Electrostatic and frictional

Gravitational and muscular

Gravitational and electrostatic

Solution

Question 7

Heating water to a high temperature

Striking a cue ball with a cue stick

Stretching the strings of a catapult

Hitting a tennis ball with a racket

Solution

Question 8

I Only

II Only

I and II

I and III

Solution

Question 9

Gravitational and magnetic

Muscular and electrostatic

Electrostatic and frictional

Muscular and frictional

Solution

Question 10

Muscular force

Frictional force

Electrostatic force

Gravitational force

Solution

Question 11

Magnetic and frictional

Magnetic and gravitational

Frictional and electrostatic

Electrostatic and gravitational

Solution

Question 12

I

II

III

IV

Solution