# MCQ Questions for Class 8 Science Chapter 11 Force and Pressure

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## MCQ Questions for Class 8 Science Chapter 11 Force and Pressure

Q.1 If a rock is brought from the surface of the moon :
(A) Its mass will change
(B) Its weight will change, but not mass.
(C) Both mass and weight will change
(D) Its mass and weight will remain the same.

Q.2 When an object undergoes acceleration :
(A) Its speed always increases
(B) Its velocity always increases
(C) It always falls towards the earth
(D) A force always acts on it

Q.3 External forces are:
(A) Always balanced
(B) Never balanced
(C) May or may not be balanced
(D) None of these

Q.4 The net force acting on a body of mass 1 kg moving with a uniform velocity of 5m/s is :
(A) 5 N
(B) 0.2 N
(C) 0 N
(D) None of these

Q.5 How many dynes are equal to 1 N ?
(A) 106
(B) 104
(C) 105
(D) 103

Q.6 A force can :
(A) Change the direction of a moving body
(B) Change the state of rest or uniform motion of a body.
(C) Change the shape of a body
(D) All of the above

Q.7 The S.I. unit of pressure is –
(A) Newton
(B) Dyne /cm2
(C) Pascal
(D) Joule

Q.8 Which among the following will exert maximum pressure when pushed with the same amount of force?
(A) An eraser of area 2 cm2
(B) A sharpened pencil tip
(C) The blunt end of a pencil
(D) The rear portion of a closed safety pin

Q.9 Pressure is also measured in :
(A) Joule
(B) mm of Hg
(C) mm of Ag
(D) Metre

Q.10 Force per unit area is called :
(A) Energy
(B) Work
(C) Pressure
(D) Thrust

Q.11 Atmospheric pressure is measured by :
(A) Barometer
(B) Manometer
(C) Screw gauge
(D) None of these

Q.12 A manometer is used to measure:
(A) Height
(B) Pressure
(C) Liquid density
(D) Atmospheric pressure

Q.13 How does pressure vary as we come from mountain top to sea level?
(A) Increases
(B) Decreases
(C) Remains same
(D) Depends on weather

Q.14 As we go deeper beneath the surface of liquid, the pressure :
(A) Remains same
(B) Increase
(C) Decreases
(D) Depends on weather

Q.15 A vacuum cleaner works on the principle of :
(A) Electromagnetic Induction
(B) Suction
(C) Mutual Induction
(D) Energy conservation

Q.16 The S.I. unit of force is :
(A) metre
(B) Newton
(C) Pascal
(D) Second

Q.17 A contact force cannot act through
(A) Empty space
(B) Touching
(C) Touching with a metal rod
(D) Touching with a wooden rod

Q.18 Which of the following is a unit of pressure?
(A) Metre
(B) Newton
(C) Square metre
(D) Pascal

Q.19 Deep-sea diving vessels have to withstand pressure from the crushing effect of sea water acting :
(A) Upwards
(B) Downwards
(C) Side ways
(D) In all directions.

Q.20 Which of the following is a type of a pressure gauge?
(A) Speedometer
(B) Manometer
(C) Syringe
(D) Thermometer