Phy Feb-Mar 2023 MCQs

Which list contains two scalar quantities and two vector quantities?

• distance, speed, time, velocity

• force, velocity, distance, mass

• mass, energy, temperature, momentum

• weight, acceleration, momentum, speed

which row describes the motion of the care at point X and at point Y

• A

• B

• C

• D

Which object is moving with constant non-zero acceleration?

• A

• B

• C

• D

The drag force on a car increases with speed. At 20 m / s, the total drag force is 400N. The mass of the car is 1200 kg and the driving force is constant at 700N.

Which statement about the acceleration of the car at 20 m / s is correct?

• The acceleration is 0.25m / s2 but will decrease as time passes.

• The acceleration is 0.25m / s2 but will increase as time passes

• The acceleration is 0.58m / s2 but will decrease as time passes

• The acceleration is 0.58m / s2 but will increase as time passes

A rectangular swimming pool is 50m long and 25 m wide. It contains water at a depth of 2 m. The density of the water is 1000 kg /m3 .

What is the mass of the water in the pool?

• 2.5 kg

• 2500 kg

• 77 000kg

• 2 500 000kg

The momentum of a body is changed by a force acting on it for a period of time. Which action increases the change in momentum?

• doubling the force and halving the time

• doubling the force for the same time

• halving both the force and the time

• halving the force and doubling the time

What is the extension of the spring with a weight of 3.0 N attached to it?

• A

• B

• C

• D

WHAT IS THE WEIGHT OF EACH BOY?

• A

• B

• C

• D

An object is rising vertically at constant speed through water. There are three vertical forces acting on it: the weight W, the drag force D, and the upward force U. Which diagram shows the magnitude and direction of the vertical forces acting on the object?

• 
• 
• 
• 

The equation used to find the change in gravitational potential energy of an object can be written as

∆EP = Y × Z × ∆h

where

∆EP is the change in gravitational energy and ∆h is the change in height.

Which row gives the quantities Y and Z?

• A

• B

• C

• D