Master the turning effect of forces with our curated collection of 1000+ Turning Effect of Forces MCQs, tailored for Class 9 students, accompanied by detailed explanations on moments and torque.

## 100+ Turning Effect of Forces MCQs with Explanations

Explore the intricacies of the Turning Effect of Forces with our specialized collection of MCQs. Tailored for Class 9 students, this extensive repository of over 100+ MCQs, accompanied by detailed explanations, illuminates concepts surrounding moments and torque.

- A force that tends to make an object rotate is called:

A) Gravitational force

B) Frictional force

C) Normal force

D) Torque force

Correct Option: D

Explanation: Torque is the rotational equivalent of force. It causes objects to rotate about an axis. - Which of the following is NOT a condition for equilibrium?

A) Sum of all forces acting on an object is zero

B) Sum of all torques acting on an object is zero

C) Object is at rest or moving with constant velocity

D) Object is accelerating

Correct Option: D

Explanation: In equilibrium, the object is either at rest or moving with constant velocity. Acceleration indicates a lack of equilibrium. - What is the center of mass of an object?

A) The point where the object’s weight is concentrated

B) The point where the object’s mass is concentrated

C) The point where all external forces act

D) The point where the object’s density is maximum

Correct Option: B

Explanation: The center of mass is the point where the entire mass of an object can be considered to be concentrated. - If a force is applied to an object in a direction perpendicular to the lever arm, the torque produced will be:

A) Maximum

B) Minimum

C) Zero

D) Variable

Correct Option: C

Explanation: Torque is the product of force and lever arm length. If the force is perpendicular to the lever arm, the lever arm length becomes the maximum, resulting in maximum torque. - What is the unit of torque?

A) Newton

B) Newton-meter

C) Meter

D) Joule

Correct Option: B

Explanation: Torque is the product of force and distance, hence its unit is Newton-meter (Nm). - Which of the following statements about the principle of moments is true?

A) It states that the total torque acting on an object is zero

B) It states that an object will be in equilibrium if the sum of clockwise moments equals the sum of anticlockwise moments

C) It states that the center of mass of an object is the point where all forces act

D) It states that the gravitational force acting on an object is balanced by the normal force

Correct Option: B

Explanation: The principle of moments states that for an object in equilibrium, the sum of clockwise moments equals the sum of anticlockwise moments. - Which of the following is NOT a unit of force?

A) Newton

B) Dyne

C) Pascal

D) Kilogram-force

Correct Option: C

Explanation: Pascal is the unit of pressure, not force. - If two forces of equal magnitude act in opposite directions, the resultant force is:

A) Zero

B) Double the magnitude of each force

C) Equal to the magnitude of one of the forces

D) Half the magnitude of each force

Correct Option: A

Explanation: When two forces of equal magnitude act in opposite directions, they cancel each other out, resulting in zero net force. - Which of the following statements about the center of gravity is true?

A) It always lies within the object

B) It always coincides with the center of mass

C) It depends on the shape and mass distribution of the object

D) It is a fixed point in an object

Correct Option: C

Explanation: The position of the center of gravity depends on the distribution of mass within the object and its shape. - The turning effect of a force is called:

A) Work

B) Power

C) Torque

D) Energy

Correct Option: C

Explanation: Torque is the turning effect of a force about an axis of rotation. - A body is said to be in equilibrium if:

A) It is at rest

B) It is moving with constant velocity

C) The vector sum of all the forces acting on it is zero

D) The vector sum of all the torques acting on it is zero

Correct Option: C

Explanation: Equilibrium implies that the net force acting on the body is zero. - Which of the following statements about the resolution of forces is true?

A) It involves combining forces to find their resultant

B) It involves breaking a single force into two or more component forces

C) It only applies to parallel forces

D) It only applies to non-parallel forces

Correct Option: B

Explanation: Resolution of forces involves breaking down a single force into its components along different axes. - The point where the entire weight of an object appears to act is called:

A) Center of gravity

B) Center of mass

C) Pivot point

D) Equilibrium point

Correct Option: A

Explanation: The center of gravity is the point where the entire weight of an object appears to act. - Which of the following factors affect the stability of an object?

A) Mass

B) Base area

C) Height of the center of gravity

D) All of the above

Correct Option: D

Explanation: All the mentioned factors – mass, base area, and height of the center of gravity – affect the stability of an object. - The perpendicular distance between the line of action of the force and the axis of rotation is called:

A) Force arm

B) Lever arm

C) Torque arm

D) Radius of rotation

Correct Option: B

Explanation: The lever arm is the perpendicular distance between the line of action of the force and the axis of rotation. - Which of the following statements about equilibrium is true?

A) An object in equilibrium can have a net force acting on it

B) An object in equilibrium cannot have any external forces acting on it

C) An object in equilibrium can have a non-zero net torque acting on it

D) An object in equilibrium has all forces acting on it balanced

Correct Option: D

Explanation: In equilibrium, the net force and net torque acting on the object are both zero. - Which of the following pairs of quantities have the same units?

A) Force and energy

B) Torque and momentum

C) Work and power

D) Pressure and density

Correct Option: B

Explanation: Torque and momentum both have units of kilogram-meter per second squared (kg⋅m/s²). - A couple is a pair of forces that:

A) Have equal magnitudes and opposite directions

B) Act along parallel lines

C) Have different magnitudes and opposite directions

D) Act along intersecting lines

Correct Option: A

Explanation: A couple consists of two equal and opposite forces acting along parallel lines. - The tendency of an object to remain at rest or in uniform motion is called:

A) Inertia

B) Friction

C) Velocity

D) Acceleration

Correct Option: A

Explanation: Inertia is the property of an object to resist changes in its state of motion. - Which of the following statements about the center of mass is true?

A) It is always located at the geometric center of the object

B) It is the point where all external forces act

C) It remains fixed regardless of the orientation of the object

D) It coincides with the center of gravity

Correct Option: D

Explanation: The center of mass and the center of gravity coincide for objects in a uniform gravitational field. - The sum of all the torques acting on an object is called:

A) Resultant torque

B) Net torque

C) Zero torque

D) None of the above

Correct Option: B

Explanation: The net torque is the sum of all the torques acting on an object. - When a body is in equilibrium, it implies that:

A) The body is at rest

B) The body is moving with uniform velocity

C) The net force acting on the body is zero

D) All of the above

Correct Option: D

Explanation: In equilibrium, the net force and net torque acting on the body are both zero. - Which of the following statements about torque is true?

A) It is a scalar quantity

B) It is measured in newtons

C) It is the product of force and distance

D) It depends only on the magnitude of the force

Correct Option: C

Explanation: Torque is the product of force and the perpendicular distance from the pivot point to the line of action of the force. - Which of the following is NOT a condition for rotational equilibrium?

A) The sum of all torques is zero

B) The net force acting on the object is zero

C) The object is at rest

D) The object is accelerating

Correct Option: D

Explanation: Rotational equilibrium requires that the sum of all torques acting on the object is zero and the object is either at rest or moving with constant angular velocity. - The point about which a body can rotate is called the:

A) Center of gravity

B) Center of mass

C) Pivot point

D) Equilibrium point

Correct Option: C

Explanation: The pivot point is the point about which a body can rotate. - Which of the following statements about the stability of an object is true?

A) An object with a higher center of gravity is more stable

B) An object with a wider base is less stable

C) An object is more stable if its center of gravity is above its base

D) All of the above

Correct Option: C

Explanation: An object is more stable if its center of gravity is above its base, as it is less likely to topple over. - The point where the entire mass of an object can be considered to be concentrated is called:

A) Pivot point

B) Center of mass

C) Center of gravity

D) Equilibrium point

Correct Option: B

Explanation: The center of mass is the point where the entire mass of an object can be considered to be concentrated. - Which of the following statements about the center of gravity is true?

A) It always lies within the object

B) It always coincides with the center of mass

C) It depends on the shape and mass distribution of the object

D) It is a fixed point in an object

Correct Option: C

Explanation: The position of the center of gravity depends on the distribution of mass within the object and its shape. - The point where the entire weight of an object appears to act is called:

A) Center of gravity

B) Center of mass

C) Pivot point

D) Equilibrium point

Correct Option: A

Explanation: The center of gravity is the point where the entire weight of an object appears to act. - Which of the following factors affect the stability of an object?

A) Mass

B) Base area

C) Height of the center of gravity

D) All of the above

Correct Option: D

Explanation: All the mentioned factors – mass, base area, and height of the center of gravity – affect the stability of an object. - The perpendicular distance between the line of action of the force and the axis of rotation is called:

A) Force arm

B) Lever arm

C) Torque arm

D) Radius of rotation

Correct Option: B

Explanation: The lever arm is the perpendicular distance between the line of action of the force and the axis of rotation. - Which of the following statements about equilibrium is true?

A) An object in equilibrium can have a net force acting on it

B) An object in equilibrium cannot have any external forces acting on it

C) An object in equilibrium can have a non-zero net torque acting on it

D) An object in equilibrium has all forces acting on it balanced

Correct Option: D

Explanation: In equilibrium, the net force and net torque acting on the object are both zero. - Which of the following pairs of quantities have the same units?

A) Force and energy

B) Torque and momentum

C) Work and power

D) Pressure and density

Correct Option: B

Explanation: Torque and momentum both have units of kilogram-meter per second squared (kg⋅m/s²). - A couple is a pair of forces that:

A) Have equal magnitudes and opposite directions

B) Act along parallel lines

C) Have different magnitudes and opposite directions

D) Act along intersecting lines

Correct Option: A

Explanation: A couple consists of two equal and opposite forces acting along parallel lines. - The tendency of an object to remain at rest or in uniform motion is called:

A) Inertia

B) Friction

C) Velocity

D) Acceleration

Correct Option: A

Explanation: Inertia is the property of an object to resist changes in its state of motion. - Which of the following statements about the center of mass is true?

A) It is always located at the geometric center of the object

B) It is the point where all external forces act

C) It remains fixed regardless of the orientation of the object

D) It coincides with the center of gravity

Correct Option: D

Explanation: The center of mass and the center of gravity coincide for objects in a uniform gravitational field. - The sum of all the torques acting on an object is called:

A) Resultant torque

B) Net torque

C) Zero torque

D) None of the above

Correct Option: B

Explanation: The net torque is the sum of all the torques acting on an object. - When a body is in equilibrium, it implies that:

A) The body is at rest

B) The body is moving with uniform velocity

C) The net force acting on the body is zero D) All of the above

Correct Option: D

Explanation: In equilibrium, the net force and net torque acting on the body are both zero. - Which of the following statements about torque is true?

A) It is a scalar quantity

B) It is measured in newtons

C) It is the product of force and distance

D) It depends only on the magnitude of the force

Correct Option: C

Explanation: Torque is the product of force and the perpendicular distance from the pivot point to the line of action of the force. - Which of the following is NOT a condition for rotational equilibrium?

A) The sum of all torques is zero

B) The net force acting on the object is zero

C) The object is at rest

D) The object is accelerating

Correct Option: D

Explanation: Rotational equilibrium requires that the sum of all torques acting on the object is zero and the object is either at rest or moving with constant angular velocity. - The point about which a body can rotate is called the:

A) Center of gravity

B) Center of mass

C) Pivot point

D) Equilibrium point

Correct Option: C

Explanation: The pivot point is the point about which a body can rotate. - Which of the following statements about the stability of an object is true?

A) An object with a higher center of gravity is more stable

B) An object with a wider base is less stable

C) An object is more stable if its center of gravity is above its base

D) All of the above

Correct Option: C

Explanation: An object is more stable if its center of gravity is above its base, as it is less likely to topple over. - The point where the entire mass of an object can be considered to be concentrated is called:

A) Pivot point

B) Center of mass

C) Center of gravity

D) Equilibrium point

Correct Option: B

Explanation: The center of mass is the point where the entire mass of an object can be considered to be concentrated. - Which of the following statements about the center of gravity is true?

A) It always lies within the object

B) It always coincides with the center of mass

C) It depends on the shape and mass distribution of the object

D) It is a fixed point in an object

Correct Option: C

Explanation: The position of the center of gravity depends on the distribution of mass within the object and its shape. - The point where the entire weight of an object appears to act is called:

A) Center of gravity

B) Center of mass

C) Pivot point

D) Equilibrium point

Correct Option: A

Explanation: The center of gravity is the point where the entire weight of an object appears to act. - Which of the following factors affect the stability of an object?

A) Mass

B) Base area

C) Height of the center of gravity

D) All of the above

Correct Option: D

Explanation: All the mentioned factors – mass, base area, and height of the center of gravity – affect the stability of an object. - The perpendicular distance between the line of action of the force and the axis of rotation is called:

A) Force arm

B) Lever arm

C) Torque arm

D) Radius of rotation

Correct Option: B

Explanation: The lever arm is the perpendicular distance between the line of action of the force and the axis of rotation. - Which of the following statements about equilibrium is true?

A) An object in equilibrium can have a net force acting on it

B) An object in equilibrium cannot have any external forces acting on it

C) An object in equilibrium can have a non-zero net torque acting on it

D) An object in equilibrium has all forces acting on it balanced

Correct Option: D

Explanation: In equilibrium, the net force and net torque acting on the object are both zero. - Which of the following pairs of quantities have the same units?

A) Force and energy

B) Torque and momentum

C) Work and power

D) Pressure and density

Correct Option: B

Explanation: Torque and momentum both have units of kilogram-meter per second squared (kg⋅m/s²). - A couple is a pair of forces that:

A) Have equal magnitudes and opposite directions

B) Act along parallel lines

C) Have different magnitudes and opposite directions

D) Act along intersecting lines

Correct Option: A

Explanation: A couple consists of two equal and opposite forces acting along parallel lines. - The tendency of an object to remain at rest or in uniform motion is called:

A) Inertia

B) Friction

C) Velocity

D) Acceleration

Correct Option: A

Explanation: Inertia is the property of an object to resist changes in its state of motion. - Which of the following statements about the center of mass is true?

A) It is always located at the geometric center of the object

B) It is the point where all external forces act

C) It remains fixed regardless of the orientation of the object

D) It coincides with the center of gravity

Correct Option: D

Explanation: The center of mass and the center of gravity coincide for objects in a uniform gravitational field. - The sum of all the torques acting on an object is called:

A) Resultant torque

B) Net torque

C) Zero torque

D) None of the above

Correct Option: B

Explanation: The net torque is the sum of all the torques acting on an object. - When a body is in equilibrium, it implies that:

A) The body is at rest

B) The body is moving with uniform velocity

C) The net force acting on the body is zero

D) All of the above

Correct Option: D

Explanation: In equilibrium, the net force and net torque acting on the body are both zero. - Which of the following statements about torque is true?

A) It is a scalar quantity

B) It is measured in newtons

C) It is the product of force and distance

D) It depends only on the magnitude of the force

Correct Option: C

Explanation: Torque is the product of force and the perpendicular distance from the pivot point to the line of action of the force. - Which of the following is NOT a condition for rotational equilibrium?

A) The sum of all torques is zero

B) The net force acting on the object is zero

C) The object is at rest

D) The object is accelerating

Correct Option: D

Explanation: Rotational equilibrium requires that the sum of all torques acting on the object is zero and the object is either at rest or moving with constant angular velocity. - The point about which a body can rotate is called the:

A) Center of gravity

B) Center of mass

C) Pivot point

D) Equilibrium point

Correct Option: C

Explanation: The pivot point is the point about which a body can rotate. - Which of the following statements about the stability of an object is true?

A) An object with a higher center of gravity is more stable

B) An object with a wider base is less stable

C) An object is more stable if its center of gravity is above its base

D) All of the above

Correct Option: C

Explanation: An object is more stable if its center of gravity is above its base, as it is less likely to topple over. - The point where the entire mass of an object can be considered to be concentrated is called:

A) Pivot point

B) Center of mass

C) Center of gravity

D) Equilibrium point

Correct Option: B

Explanation: The center of mass is the point where the entire mass of an object can be considered to be concentrated. - Which of the following statements about the center of gravity is true?

A) It always lies within the object

B) It always coincides with the center of mass

C) It depends on the shape and mass distribution of the object

D) It is a fixed point in an object

Correct Option: C

Explanation: The position of the center of gravity depends on the distribution of mass within the object and its shape. - The point where the entire weight of an object appears to act is called:

A) Center of gravity

B) Center of mass

C) Pivot point

D) Equilibrium point

Correct Option: A

Explanation: The center of gravity is the point where the entire weight of an object appears to act. - Which of the following factors affect the stability of an object?

A) Mass

B) Base area

C) Height of the center of gravity

D) All of the above

Correct Option: D

Explanation: All the mentioned factors – mass, base area, and height of the center of gravity – affect the stability of an object. - The perpendicular distance between the line of action of the force and the axis of rotation is called:

A) Force arm

B) Lever arm

C) Torque arm

D) Radius of rotation

Correct Option: B

Explanation: The lever arm is the perpendicular distance between the line of action of the force and the axis of rotation. - Which of the following statements about equilibrium is true?

A) An object in equilibrium can have a net force acting on it

B) An object in equilibrium cannot have any external forces acting on it

C) An object in equilibrium can have a non-zero net torque acting on it

D) An object in equilibrium has all forces acting on it balanced

Correct Option: D

Explanation: In equilibrium, the net force and net torque acting on the object are both zero. - Which of the following pairs of quantities have the same units?

A) Force and energy

B) Torque and momentum

C) Work and power

D) Pressure and density

Correct Option: B

Explanation: Torque and momentum both have units of kilogram-meter per second squared (kg⋅m/s²). - A couple is a pair of forces that:

A) Have equal magnitudes and opposite directions

B) Act along parallel lines

C) Have different magnitudes and opposite directions

D) Act along intersecting lines

Correct Option: A

Explanation: A couple consists of two equal and opposite forces acting along parallel lines. - The tendency of an object to remain at rest or in uniform motion is called:

A) Inertia

B) Friction

C) Velocity

D) Acceleration

Correct Option: A

Explanation: Inertia is the property of an object to resist changes in its state of motion. - Which of the following statements about the center of mass is true?

A) It is always located at the geometric center of the object

B) It is the point where all external forces act

C) It remains fixed regardless of the orientation of the object

D) It coincides with the center of gravity

Correct Option: D

Explanation: The center of mass and the center of gravity coincide for objects in a uniform gravitational field. - The sum of all the torques acting on an object is called:

A) Resultant torque

B) Net torque

C) Zero torque

D) None of the above

Correct Option: B

Explanation: The net torque is the sum of all the torques acting on an object. - When a body is in equilibrium, it implies that:

A) The body is at rest

B) The body is moving with uniform velocity

C) The net force acting on the body is zero

D) All of the above

Correct Option: D

Explanation: In equilibrium, the net force and net torque acting on the body are both zero. - Which of the following statements about torque is true?

A) It is a scalar quantity

B) It is measured in newtons

C) It is the product of force and distance

D) It depends only on the magnitude of the force

Correct Option: C

Explanation: Torque is the product of force and the perpendicular distance from the pivot point to the line of action of the force. - Which of the following is NOT a condition for rotational equilibrium?

A) The sum of all torques is zero

B) The net force acting on the object is zero

C) The object is at rest

D) The object is accelerating

Correct Option: D

Explanation: Rotational equilibrium requires that the sum of all torques acting on the object is zero and the object is either at rest or moving with constant angular velocity. - The point about which a body can rotate is called the:

A) Center of gravity

B) Center of mass

C) Pivot point

D) Equilibrium point

Correct Option: C

Explanation: The pivot point is the point about which a body can rotate. - Which of the following statements about the stability of an object is true?

A) An object with a higher center of gravity is more stable

B) An object with a wider base is less stable

C) An object is more stable if its center of gravity is above its base

D) All of the above

Correct Option: C

Explanation: An object is more stable if its center of gravity is above its base, as it is less likely to topple over. - The point where the entire mass of an object can be considered to be concentrated is called:

A) Pivot point

B) Center of mass

C) Center of gravity

D) Equilibrium point

Correct Option: B

Explanation: The center of mass is the point where the entire mass of an object can be considered to be concentrated. - Which of the following statements about the center of gravity is true?

A) It always lies within the object

B) It always coincides with the center of mass

C) It depends on the shape and mass distribution of the object

D) It is a fixed point in an object

Correct Option: C

Explanation: The position of the center of gravity depends on the distribution of mass within the object and its shape. - The point where the entire weight of an object appears to act is called:

A) Center of gravity

B) Center of mass

C) Pivot point

D) Equilibrium point

Correct Option: A

Explanation: The center of gravity is the point where the entire weight of an object appears to act. - Which of the following factors affect the stability of an object?

A) Mass

B) Base area

C) Height of the center of gravity

D) All of the above

Correct Option: D

Explanation: All the mentioned factors – mass, base area, and height of the center of gravity – affect the stability of an object. - The perpendicular distance between the line of action of the force and the axis of rotation is called:

A) Force arm

B) Lever arm

C) Torque arm

D) Radius of rotation

Correct Option: B

Explanation: The lever arm is the perpendicular distance between the line of action of the force and the axis of rotation. - Which of the following statements about equilibrium is true?

A) An object in equilibrium can have a net force acting on it

B) An object in equilibrium cannot have any external forces acting on it

C) An object in equilibrium can have a non-zero net torque acting on it

D) An object in equilibrium has all forces acting on it balanced

Correct Option: D

Explanation: In equilibrium, the net force and net torque acting on the object are both zero. - Which of the following pairs of quantities have the same units?

A) Force and energy

B) Torque and momentum

C) Work and power

D) Pressure and density

Correct Option: B

Explanation: Torque and momentum both have units of kilogram-meter per second squared (kg⋅m/s²). - A couple is a pair of forces that:

A) Have equal magnitudes and opposite directions

B) Act along parallel lines

C) Have different magnitudes and opposite directions

D) Act along intersecting lines

Correct Option: A

Explanation: A couple consists of two equal and opposite forces acting along parallel lines. - The tendency of an object to remain at rest or in uniform motion is called:

A) Inertia

B) Friction

C) Velocity

D) Acceleration

Correct Option: A

Explanation: Inertia is the property of an object to resist changes in its state of motion. - Which of the following statements about the center of mass is true?

A) It is always located at the geometric center of the object

B) It is the point where all external forces act

C) It remains fixed regardless of the orientation of the object

D) It coincides with the center of gravity

Correct Option: D

Explanation: The center of mass and the center of gravity coincide for objects in a uniform gravitational field. - The sum of all the torques acting on an object is called:

A) Resultant torque

B) Net torque

C) Zero torque

D) None of the above

Correct Option: B

Explanation: The net torque is the sum of all the torques acting on an object. - When a body is in equilibrium, it implies that:

A) The body is at rest

B) The body is moving with uniform velocity

C) The net force acting on the body is zero

D) All of the above

Correct Option: D

Explanation: In equilibrium, the net force and net torque acting on the body are both zero. - Which of the following statements about torque is true?

A) It is a scalar quantity

B) It is measured in newtons

C) It is the product of force and distance

D) It depends only on the magnitude of the force

Correct Option: C

Explanation: Torque is the product of force and the perpendicular distance from the pivot point to the line of action of the force. - Which of the following is NOT a condition for rotational equilibrium?

A) The sum of all torques is zero

B) The net force acting on the object is zero

C) The object is at rest

D) The object is accelerating

Correct Option: D

Explanation: Rotational equilibrium requires that the sum of all torques acting on the object is zero and the object is either at rest or moving with constant angular velocity. - The point about which a body can rotate is called the:

A) Center of gravity

B) Center of mass

C) Pivot point

D) Equilibrium point

Correct Option: C

Explanation: The pivot point is the point about which a body can rotate. - Which of the following statements about the stability of an object is true?

A) An object with a higher center of gravity is more stable

B) An object with a wider base is less stable

C) An object is more stable if its center of gravity is above its base

D) All of the above

Correct Option: C

Explanation: An object is more stable if its center of gravity is above its base, as it is less likely to topple over. - The point where the entire mass of an object can be considered to be concentrated is called:

A) Pivot point

B) Center of mass

C) Center of gravity

D) Equilibrium point

Correct Option: B

Explanation: The center of mass is the point where the entire mass of an object can be considered to be concentrated. - Which of the following statements about the center of gravity is true?

A) It always lies within the object

B) It always coincides with the center of mass

C) It depends on the shape and mass distribution of the object

D) It is a fixed point in an object

Correct Option: C

Explanation: The position of the center of gravity depends on the distribution of mass within the object and its shape. - The point where the entire weight of an object appears to act is called:

A) Center of gravity

B) Center of mass

C) Pivot point

D) Equilibrium point

Correct Option: A

Explanation: The center of gravity is the point where the entire weight of an object appears to act. - Which of the following factors affect the stability of an object?

A) Mass

B) Base area

C) Height of the center of gravity

D) All of the above

Correct Option: D

Explanation: All the mentioned factors – mass, base area, and height of the center of gravity – affect the stability of an object. - The perpendicular distance between the line of action of the force and the axis of rotation is called:

A) Force arm

B) Lever arm

C) Torque arm

D) Radius of rotation

Correct Option: B

Explanation: The lever arm is the perpendicular distance between the line of action of the force and the axis of rotation. - Which of the following statements about equilibrium is true?

A) An object in equilibrium can have a net force acting on it

B) An object in equilibrium cannot have any external forces acting on it

C) An object in equilibrium can have a non-zero net torque acting on it

D) An object in equilibrium has all forces acting on it balanced

Correct Option: D

Explanation: In equilibrium, the net force and net torque acting on the object are both zero. - Which of the following pairs of quantities have the same units?

A) Force and energy

B) Torque and momentum

C) Work and power

D) Pressure and density

Correct Option: B

Explanation: Torque and momentum both have units of kilogram-meter per second squared (kg⋅m/s²). - A couple is a pair of forces that:

A) Have equal magnitudes and opposite directions

B) Act along parallel lines

C) Have different magnitudes and opposite directions

D) Act along intersecting lines

Correct Option: A

Explanation: A couple consists of two equal and opposite forces acting along parallel lines. - The tendency of an object to remain at rest or in uniform motion is called:

A) Inertia

B) Friction

C) Velocity

D) Acceleration

Correct Option: A

Explanation: Inertia is the property of an object to resist changes in its state of motion. - Which of the following statements about the center of mass is true?

A) It is always located at the geometric center of the object

B) It is the point where all external forces act

C) It remains fixed regardless of the orientation of the object

D) It coincides with the center of gravity

Correct Option: D

Explanation: The center of mass and the center of gravity coincide for objects in a uniform gravitational field. - The sum of all the torques acting on an object is called:

A) Resultant torque

B) Net torque

C) Zero torque

D) None of the above

Correct Option: B

Explanation: The net torque is the sum of all the torques acting on an object. - When a body is in equilibrium, it implies that:

A) The body is at rest

B) The body is moving with uniform velocity

C) The net force acting on the body is zero

D) All of the above

Correct Option: D

Explanation: In equilibrium, the net force and net torque acting on the body are both zero. - Which of the following statements about torque is true?

A) It is a scalar quantity

B) It is measured in newtons

C) It is the product of force and distance

D) It depends only on the magnitude of the force

Correct Option: C

Explanation: Torque is the product of force and the perpendicular distance from the pivot point to the line of action of the force. - Which of the following is NOT a condition for rotational equilibrium?

A) The sum of all torques is zero

B) The net force acting on the object is zero

C) The object is at rest

D) The object is accelerating

Correct Option: D

Explanation: Rotational equilibrium requires that the sum of all torques acting on the object is zero and the object is either at rest or moving with constant angular velocity. - The point about which a body can rotate is called the:

A) Center of gravity

B) Center of mass

C) Pivot point

D) Equilibrium point

Correct Option: C

Explanation: The pivot point is the point about which a body can rotate. - Which of the following statements about the stability of an object is true?

A) An object with a higher center of gravity is more stable

B) An object with a wider base is less stable

C) An object is more stable if its center of gravity is above its base

D) All of the above

Correct Option: C

Explanation: An object is more stable if its center of gravity is above its base, as it is less likely to topple over. - The point where the entire mass of an object can be considered to be concentrated is called:

A) Pivot point

B) Center of mass

C) Center of gravity

D) Equilibrium point

Correct Option: B

Explanation: The center of mass is the point where the entire mass of an object can be considered to be concentrated. - Which of the following statements about the center of gravity is true?

A) It always lies within the object

B) It always coincides with the center of mass

C) It depends on the shape and mass distribution of the object

D) It is a fixed point in an object

Correct Option: C

Explanation: The position of the center of gravity depends on the distribution of mass within the object and its shape. - The point where the entire weight of an object appears to act is called:

A) Center of gravity

B) Center of mass

C) Pivot point

D) Equilibrium point

Correct Option: A

Explanation: The center of gravity is the point where the entire weight of an object appears to act. - Which of the following factors affect the stability of an object?

A) Mass

B) Base area

C) Height of the center of gravity

D) All of the above

Correct Option: D

Explanation: All the mentioned factors – mass, base area, and height of the center of gravity – affect the stability of an object.

## Physics Class 9 MCQs Chapter wise

Immerse yourself in dedicated chapters showcasing Class 9 Physics MCQs, meticulously organized by topic for streamlined exploration and intensive study. Each chapter features more than 1000 MCQs, presenting plentiful practice opportunities to enhance comprehension and master Physics principles efficiently. Access MCQs for individual chapters effortlessly by clicking on the respective chapter names listed below.

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