Force And Pressure - Chapter Wise CBSE Solved Question and Answer Based On NCERT
Very Short Q&A:
Q1: Push or pull on an object is known as ______________.
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Force
Q2: Force has both magnitude and ______________.
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Direction
Q3: The strength of force is usually expressed by its _____________.
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Magnitude
Q4: What can bring change in state of motion of an object?
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Force can bring change in state of motion of an object.
Q5: Define pressure.
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Force per unit area is called pressure.
Q6: What are contact forces?
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Forces which act only when there is physical contact between two interacting objects are known as contact forces.
Q7: What are non-contact forces?
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Forces which can act without physical contact between objects are known as non-contact forces.
Q8: What happens when the forces are applied on an object in the same direction?
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Forces applied on an object in the same direction add to one another.
Q9: Force can bring change in _____________ and _____________ of an object.
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State of motion, shape.
Q10: Give an example of contact force.
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Friction
Q11: Give two examples of non-contact forces.
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Magnetic force and gravitational force.
Q12: A batsman hits a cricket ball which then rolls on the level ground. After covering a short distance the ball comes to rest. The ball stops due to____________.
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Frictional force
Q13: When two forces, applied on an object, are equal and opposite, then these forces
May move the object.
May stop a moving object.
May move the object and also cause a change in its shape.
Do not move the object but may cause a change in its shape.
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D
Q14: Which of the following is an example of contact force?
Magnetic force
Muscular force
Electric force
Gravitational force
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B
Q15: A fruit falling from tree is an example of which type of force?
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Gravitational force.
Q16: What is the unit of pressure?
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Pascal.
Q17: Which force act from distance and pull iron objects?
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Magnetic force.
Q18: What is SI unit of Force?
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Newton
Q19: What is muscular force?
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The force resulting due to the action of muscles is known as muscular force.
Q20: What is the relation between direction of force of friction and direction of motion?
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Direction of force of friction is always opposite to the direction of motion.
Q21: Define electrostatic force.
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The force exerted by a charged body on another charged or uncharged body is known as electrostatic force.
Q22: Electrostatic force is an example of ______________.
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Non-contact forces.
Q23: Water begins to flow towards the ground as soon as we open a tap. This happens due to which force?
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Force of gravity.
Q24: Southpole of a magnet repels south pole of another magnet. True/false.
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True
Q25: Define friction.
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Friction is a force that resists the motion of an object that is in contact with another object or material.
Q26: Why the cutting edge of a knife should be as sharp as possible?
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The cutting edge of a knife should as sharp to create greater pressure even for a very small applied force for quick action.
Q27: Cars and buses are able to run on roads. Which force is responsible for it?
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Cars and buses are able to run on roads because of friction between the tyres and the road.
Q28: If the area over which the force acts decreases, the pressure __________.
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Increases
Q29: Which force is used to separate solid pollutant particles from smoke given out from factories?
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Electrostatic force.
Q30: What is the force exerted by the Earth on all the bodies on its surface known as?
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Gravitational force.
Q31: Name the instrument which is used to measure liquid pressure.
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Monometer
Q32: A liquid exerts pressure in __________ direction. ( upward/downward/sideways/all)
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All
Q33: Which type of force a person applies while pulling an object?
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Muscular force.
Q34: Why muscular force is a type of contact force?
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Because muscular force can be applied only when it is in contact with an object.
Q35: If the area over which the force acts decreases, the pressure increases. (true/false)
