PHY101 Midterm MCQs by Danish Hanif

Q1. Light year is a unit of: (1 marks)

Distance

Q2. A force of 100 N acts upon a body for five seconds. What will be the change in momentum?_____. (1 marks)

500Ns

Q3. Add two (1 marks)

vectors of length 4 m & 5 m but their orientation is not known. The length after addition of these two vectors will be:

Between 9m and 1m

Q4. Example of (1 marks)

physical quantity is:

Length

Q5. An inelastic (1 marks)

collision is one in which:

kinetic energy

Q6. in a body is always produced in the direction of: (1 marks)

Velocity

Q7. Ali wants to (1 marks)

lift a mass of 7.5 kg with constant velocity by a rope that passes through a frictionless pulley which is attached to the ceiling of room. Calculate the tension in the rope by neglecting the mass of the rope.

0.75N

Q8. second is SI unit of: (1 marks)

Impulse

9 (Marks:1) Vu-

The area under the curve of force-displacement graph represents:

Fs

Q10. When you step on the accelerator to increase the speed of your car, the force that accelerates the car is? (1 marks)

Fricti0n

Q11. Is the total (1 marks)

momentum of a system is changing?

A next external force must be acting 0n the system

Q12. If the (1 marks)

acceleration of a body is not uniform, then velocity-time graph will be: A curved line.

Q13. The goal of (1 marks)

all scientific inquiry (or scientific method) is: predicting natural events based.

Q14. The law of (1 marks)

conservation of momentum applies to a system of colliding objects only if:

The net external Impulse is zero

Q15. ....Work has dimensions like: (1 marks)

power

Q16. Question No:17 (Marks:1) ....An object (1 marks)

moves in a circle at constant speed. The work done by the centripetal force is zero because:

The centripetaI force is perpendicular to the velocity

The work done by gravity during the descent of a projectile: