9th Physics Chapter3 Dynamics
| Sr # | Questions | A | B | C | D |
|---|---|---|---|---|---|
| 1 | Which of the following is an example of a non-contact force? | Friction | Tension | Gravity | Magnetic force | 2 | If the net force on an object is zero, it will have: | Constant acceleration | No acceleration | Increasing acceleration | Decreasing acceleration | 3 | What is the formula for calculating acceleration? | a= F/m | a=f/t | a=m/f | a=t/F | 4 | What is the unit of momentum? | Joule | Newton | Kilogram-meter per second | Watt | 5 | According to Newton’s first law of motion, an object at rest tends to stay at rest unless acted upon by: | Gravitational force | Frictional force | Magnetic force | Electrical force | 6 | Which of the following represents a balanced force? | 5 N to the right | 10 N to the left | 15 N upward | 20 N downward | 7 | Inertia depends upon | force | net force | friction | mass | 8 | Which of the following statements is consistent with the third law of motion? | For every action, there is an equal reaction in the same direction. | For every action, there is an equal reaction in the opposite direction. | An object at rest will remain at rest unless acted upon by an unbalanced force. | An object's acceleration is directly proportional to its mass. | 9 | The force of gravity between two objects is influenced by their: | Mass and volume | Mass and distance | Volume and density | Shape and size | 10 | Which of the following materials lowers friction when pushed between metal plates: | Water | Fine marble powder | Air | Oil | 11 | If the mass of an object remains constant and the net force applied to it doubles, what happens to its acceleration? | It doubles | It halves | It remains the same | It quadruples | 12 | According to Newton’s second law, the acceleration of an object is directly proportional to the net force applied and inversely proportional to its: | Mass | Velocity | Volume | Density | 13 | What is the acceleration due to gravity on the surface of the Earth? | 9.8 m/s² | 6.4 m/s² | 3.0 m/s² | 1.0 m/s² | 14 | which of the following is the unit of momentum? | Nm | Kgms^-2 | Ns | Ns^-1 | 15 | when horse pulls a cart, the action is on the: | cart | Earth | horse | Earth and cart | 16 | Which of the following material lowers friction when pushed between metal plates? | water | fine marble powder | air | oil | 17 | A string is stretched by two equal and opposite forces 10N each.The tension in the string is | zero | 5N | 10N | 20N | 18 | If the net force acting on an object is 0 N, its velocity will: | Increase | Decrease | Remain constant | Change direction | 19 | In the absence of air resistance, if two objects of different masses are dropped from the same height, which one will hit the ground first? | The heavier one | The lighter one | Both will hit simultaneously | It depends on their shapes | 20 | What is the SI unit of force? | Joule | Newton | Watt | Kilogram | 21 | In a frictionless environment, an object in motion will: | Slow down and stop | Continue moving at a constant velocity | Speed up indefinitely | Change direction | 22 | Which of the following is a vector quantity? | Mass | Speed | Force | Temperature | 23 | The weight of an object is a measure of its: | Mass | Volume | Density | Acceleration | 24 | Which of the following is a contact force? | Magnetic force | Gravitational force | Tension in a rope | Electric force | 25 | A car accelerates from 0 to 60 km/h in 10 seconds. What is its acceleration in m/s²? | 0.6 m/s² | 6 m/s² | 60 m/s² | 600 m/s² | 26 | Newton,s first law of motion is valid only in the absence of : | force | net force | friction | momentum | 27 | The tendency of an object to resist a change in its state of motion is known as: | Inertia | Momentum | Velocity | Acceleration |