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Force And Pressure

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Which of the following is a contact force? a. Muscular force b. Electrostatic force c. Gravitational force

  1. Only a

  2. Only a and b

  3. Only b and c

  4. Only c

  5. Only b


Correct Option: A
Explanation:

Muscular force is a contact force. This is the correct option.

Which of the following statements is/are false? a. In interaction, each object acts in such a way, so as to have an effect on the other object. b. The direction in which the object is pushed or pulled is called the direction of force. c. Force has magnitude but no direction.

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

  5. Only c


Correct Option: E
Explanation:

Statement 'c' is a false statement. Thus, it is the correct option. Force has magnitude as well as direction.

Which of the following is the SI unit of force?

  1. Newton

  2. Kelvin

  3. Celsius

  4. Kilogram

  5. Pascal


Correct Option: A
Explanation:

This is the correct option. The SI unit of force is newton (N).

Which of the following statements is/ are false? a. The strength of a force is expressed by its direction. b. One newton is the force, which can make an object of one kilogram mass to move at a speed of one meter per second. c. If the magnitude or the direction of the applied force changes, the effect produced by the force also changes.

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

  5. Only c


Correct Option: A
Explanation:

Statement 'a' is a false statement. Thus, it is the correct option. The strength of a force is expressed by its magnitude, and not its direction.

If the two forces applied to an object act in the same direction, then the resultant force acting on the object will be equal to which of the following?

  1. It will be equal to the difference between the two forces.

  2. It will be equal to the sum of the two forces.

  3. It will be equal to zero.

  4. It will be equal to the product of the two forces.

  5. None of the above


Correct Option: B
Explanation:

This is the correct option. If the two forces applied to an object act in the same direction, then the resultant force acting on the object will be equal to the sum of the two forces.

Which of the following is/are non-contact forces? a. Magnetic force b. Electrostatic force c. Muscular force d. Gravitational force

  1. Only c

  2. Only c and d

  3. Only b and c

  4. Only a and c

  5. Only a, b and d


Correct Option: E
Explanation:

This is the correct option, as magnetic, electrostatic and gravitational forces are non-contact forces.

Which of the following statements is/are false? a. The high air pressure produced by the gas molecules on the walls of baloon causes it to expand and get inflated. b. The pressure exerted by a liquid on the walls of its container increases with the increasing depth. c. The rise of liquid in a dropper is due to the gravitational force.

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

  5. Only c


Correct Option: E
Explanation:

Statement 'c' is a false statement. Thus, it is the correct option. The rise of liquid in a dropper is due to the atmospheric pressure.

Which of the following statements is/are false? a. A force can move a stationary object. b. A force can change the speed of a moving object. c. Force cannot change the direction of a moving object.

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

  5. Only c


Correct Option: E
Explanation:

This is the correct option, as statement 'c' is false. Force can change the direction of a moving object, is the correct statement.

If the two forces applied to an object are equal in magnitude and act in opposite directions, then the net forces acting on the object ____________.

  1. will be zero

  2. will be equal to the sum of the two forces

  3. will be equal to the greater of the two forces

  4. will be equal to the product of the two forces

  5. None of the above


Correct Option: A
Explanation:

This is the correct option. If the two forces applied to an object are equal in magnitude and act in opposite directions, then the net forces acting on the object will be zero.

Which of the following statements is/are false? a. If the force is applied in the direction of motion of the object, its speed increases. b. At the higher altitudes, the atmospheric pressure is much more than our blood pressure. c. The magnetic force between a magnet and an iron object is always that of attraction.

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

  5. Only c


Correct Option: C
Explanation:

Statement 'b' is a false statement. Thus, it is the correct option. At the higher altitudes, the atmospheric pressure is much less than our blood pressure.

Which of the following is not an example of use of muscular force?

  1. A porter carrying a load on a wheel-barrow.

  2. A boy pushing a cart on the road.

  3. A child riding a bicycle.

  4. A person drawing water from the well.

  5. The stopping of a rolling ball after covering a little distance.


Correct Option: E
Explanation:

This is the correct option, as it is not an example of use of muscular force.

On which of the following metals, magnetic force is not exerted by a magnet? a. Nickel b. Cobalt c. Copper

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

  5. Only c


Correct Option: E
Explanation:

This is the correct option, as magnetic force is not exerted on copper by a magnet.

Which of the following is utilised in reducing air pollution by removing dust, soot and fly-ash particles from the smoke coming out of chimneys of factories?

  1. Gravitational force

  2. Magnetic force

  3. Muscular force

  4. Electrostatic force

  5. Frictional force


Correct Option: D
Explanation:

This is the correct option. Electrostatic force is utilised in reducing air pollution by removing dust, soot and fly-ash particles from the smoke coming out of chimneys of factories.

The pressure produced by a given force does not depend upon: a. force applied b. area over which the force acts c. mass of the object

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

  5. Only c


Correct Option: E
Explanation:

This is the correct option. The pressure produced by a given force does not depend upon the mass of the object.

Match the following:

 
a. Contact force 1. It is the force exerted by the muscles of the body.
b. Muscular force 2. It is the force, which can be exerted by an object on another object even from a distance, without touching each other.
c. Non-contact force 3. It is a force, which can be exerted by an object on another object only through physical touching.
  1. a - 3, b - 2, c - 1

  2. a - 3, b - 1, c - 2

  3. a - 1, b - 3, c - 2

  4. a - 1, b - 2, c - 3

  5. a - 2, b - 1, c - 3


Correct Option: B
Explanation:

This is the correct option. Contact force is a force, which can be exerted by an object on another object only through physical touching. Muscular force is the force exerted by the muscles of the body. Non-contact force is the force, which can be exerted by an object on another object even from a distance, without touching each other.

If we drop a stone from a certain height, it falls to the ground. Which of the following force is responsible for making the stone fall to the ground?

  1. Electrostatic force

  2. Muscular force

  3. Magnetic force

  4. Gravitational force

  5. Frictional force


Correct Option: D
Explanation:

Gravitational force is the pull exerted by objects possessing mass. This is the correct option.

Which of the following statements is/are false? a. Like poles of two magnets attract each other, whereas unlike poles repel each other. b. The magnetic force exerted by one magnet on the other magnet is a non-contact force. c. An electrically charged object can exert an electrostatic force on an uncharged object.

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

  5. Only c


Correct Option: A
Explanation:

Statement 'a' is a false statement. Thus, it is the correct option. Like poles of two magnets repel each other, whereas unlike poles attract each other.

Which of the following forces between the Sun and the Earth holds the Earth in its orbit around the Sun?

  1. Magnetic force

  2. Muscular force

  3. Frictional force

  4. Electrostatic force

  5. Gravitational force


Correct Option: E
Explanation:

This is the correct option. Gravitational force between the Sun and the Earth holds the Earth in its orbit around the Sun.

Which of the following statements is/are false? a. The pressure exerted by a liquid decreases with the increase in depth inside the liquid. b. The same force produces less pressure if it acts on a large area but it can produce high pressure if it acts on a smaller area. c. The SI unit of pressure is pascal.

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

  5. Only c


Correct Option: A
Explanation:

Statement 'a' is a false statement. Thus, it is the correct option. The pressure exerted by a liquid increases with the increase in depth inside the liquid.

An equal force 'A' acts on different objects having the surface area given below. In which case, the pressure exerted by the force will be the minimum?

  1. 20 m2

  2. 19 m2

  3. 10 m2

  4. 8 m2

  5. 5 m2


Correct Option: A
Explanation:

This is the correct option because the larger the surface area, smallest will be the pressure produced.

Match the following:

 
a. Frictional force 1. It is a force exerted by a magnet.
b. Magnetic force 2. It is the force exerted by an electrically charged object.
c. Electrostatic force 3. It is a force, which always opposes the motion of one body over another body.
  1. a - 3, b - 2, c - 1

  2. a - 3, b - 1, c - 2

  3. a - 1, b - 3, c - 2

  4. a - 1, b - 2, c - 3

  5. a - 2, b - 1, c - 3


Correct Option: B
Explanation:

This is the correct option. Frictional force is a force, which always opposes the motion of one body over another body. Magnetic force is a force exerted by a magnet. Electrostatic force is the force exerted by an electrically charged object.

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