MATRIC • FSC • NTS • ETEA • CSS • PMS etc MCQs Learn, Practice, Prepare, Succeed! Prepare Today, Succeed Tomorrow!

Q: An empty suitcase is placed on the floor in the middle of a bus traveling at high speed. When the bus brakes suddenly, the suitcase will slide

A) Backwards

B) Forward

C) Jumps up

D) Remains in place

Q: In Newton's third law, the action-reaction pair does not neutralize each other because they

A) Act on same body

B) Act on different bodies

C) Act on third body

D) Produce friction

Q: Conventionally anticlockwise torque is taken as

A) Negative

B) Positive

C) Parallel

D) Zero

Q: A door requires a minimum torque of 80 Nm in order to open it. What is the minimum distance of the handle from the hinges, if the force applied is not greater than 100 N?

A) 0.6 m

B) 1 m

C) 0.4 m

D) 0.8 m

Q: Two children are balanced on opposite sides of a seesaw. If one child leans inward toward the pivot point, her side will

A) Rise

B) Fall

C) Insufficient data

D) Neither rise nor fall

Q: A body in equilibrium must not be

A) At rest

B) Moving

C) Rotating

D) Accelerating

Q: The torque in a uniformly rotating fan having blade of length 0.5 m is

A) 0.5 Nm

B) 2 Nm

C) -0.5 Nm

D) 0 Nm

Q: A force of 100 N is applied perpendicularly at 0.5 m to turn the nut of a wheel of a bus. The torque acting on the nut is

A) 500 Nm

B) 50 Nm

C) 5 Nm

D) 0.005 Nm

Q: The shortest distance between two couple forces is

A) Moment arm

B) Couple arm

C) Radius

D) Double moment

Q: A girl pushes to open a door perpendicularly with a force of 25 N at 0.6 m from the hinge. The torque is

A) 41.6 Nm

B) 25.6 Nm

C) 15 Nm

D) 0 Nm

Q: The angle at which x and y components of force are equal is

A) 0°

B) 30°

C) 45°

D) 60°

Q: Center of mass (CM) is different from center of gravity (CG) when we have

A) Shape of object

B) Mass of object

C) Gravitational force

D) None of these

Q: Two masses are separated by a distance r. If both masses are doubled, the force of interaction between the two masses changes by a factor

A) 2

B) 4

C) 1/2

D) 1/4

Q: The radius of Earth is

A) 9.8 m

B) 6.67×10⁻¹¹ m

C) 6×10²⁴ m

D) 6.67×10⁶ m

Q: The SI unit of the gravitational constant "G" is

A) N kg²

B) Nm²/kg⁻²

C) Nm²kg²

D) Nm⁻²/kg⁻²

Q: What is the mass on planet Mercury of an object that weighs 784 N on the Earth's surface?

A) 80.0 kg

B) 118 kg

C) 784 kg

D) More information needed

Q: An object is orbiting a planet with orbital speed v. If the radius is same and mass of planet is increased 4 times, by what factor will orbital speed change?

A) 2

B) 4

C) 1/2

D) 1/4

Q: The value of g at the surface of the Moon is

A) 9.8 m/s²

B) 1.63 m/s²

C) 4.9 m/s²

D) 8.9 m/s²

Q: The value of g with altitude

A) Increases

B) Decreases

C) Becomes zero

D) Remains the same

Q: When a body is moved from sea level to the top of a mountain, there is change in the body's

A) Mass

B) Weight

C) None

D) Both mass and weight