Punjab 9th Class Physics Chapter 3 Dynamics Mcqs Test Online

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Question 1 of 9

Physics

1. Two bodies of masses m₁ and m₂ attached to the ends of an inextensible string passing over a frictionless pulley such that both move vertically. The acceleration of the bodies is:

m₁ + m₂/m₁–m₂ g

m₁ x m₂/m₁+m₂ g

2m₁ m₂/m₁+m₂ g

m₁ – m₂/m₁+m₂ g

Question 1 of 9

Question 2 of 9

2. The mass of a body:

decreases when accelerated

increases when accelerated

decreases when moving with high velocity

opposite to the direction of motion

Question 2 of 9

Question 3 of 9

3. Inertia depends upon:

force

net force

mass

velocity

Question 3 of 9

Question 4 of 9

4. Which of the following is the unit of momentum is:

Nm

kgms⁻²

Ns⁻¹

Ns

Question 4 of 9

Question 5 of 9

5. Which of the following material lowers friction when pushed between metal plates?

air

water

fine marble powder

oil

Question 5 of 9

Question 6 of 9

6. A string is stretched by two equal and opposite forces of 10 N each. The tension in the string is:

zero

10N

5N

20 N

Question 6 of 9

Question 7 of 9

7. Newton’s first Law of motion is valid only in the absence of:

force

friction

momentum

net force

Question 7 of 9

Question 8 of 9

8. A boy jumps out of a moving bus. There is a danger for him to all:

towards the moving bus

opposite to the direction of motion

in the direction of motion

away from the bus

Question 8 of 9

Question 9 of 9

9. When a horse pulls a cart, the action is on the:

horse

earth and cart

cart

earth

Question 9 of 9

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