CBSE Class 8 Science Force and Pressure Assignment Set A

CBSE Class 8 Science Force and Pressure Assignment Set A. Students are advised to refer to the attached assignments and practice them regularly. This will help them to identify their weak areas and will help them to score better in examination. Parents should download and give the assignments to their children for practice. 

Question. A car accelerates on a horizontal road due to the force exerted by:
(A) the engine of the ear
(B) the driver of the car
(C) the earth
(D) the road

Answer: D

Question. While walking on ice, one should take small steps to avoid slipping. This is because smaller steps ensure:
(A) larger friction
(B) smaller friction
(C) larger normal force
(D) smaller normal force

Answer: D

Question. A force is applied to an object in the direction of its motion. The speed of object will
(A) increase
(B) decrease
(C) can't say
(D) remain unchanged

Answer: A

Question. Friction can be increased by:
(A) making the surfaces rough
(B) using dry surfaces
(C) increasing the weight
(D) all of the above

Answer: D

Question. Which of the following is a non contact force?
(A) muscular
(B) electrostatic attraction
(C) elastic spring force
(D) friction force

Answer: B

Question. If no force acts on a body it will .....................
(A) change shape
(B) move with increased speed
(C) either remain in rest or move in a straight line
(D) break up

Answer: C

Question. The force of friction between two bodies is:
(A) parallel to contact surface
(B) perpendicular to contact surface
(C) inclined to contact surface
(D) a non contact force

Answer: A

Question. In football, a goal keeper stops a ball. This is due to:
(A) friction between the ball and hand of goal keeper
(B) decrease in speed of ball due to air resistance
(C) application of force by goal keeper
(D) all of the above

Answer: C

Question. Which of the following action describes pushing by a body?
(A) kicking
(B) lifting
(C) picking
(D) opening

Answer: A

Question. Which of the following example describes change of shape by applying force?
(A) kicking a ball to move faster
(B) switching on a fan to rotate
(C) jumping from a height
(D) tearing a paper into two pieces

Answer: D

Question. A body floats in water because:
(A) no force is acting on it
(B) the net force acting on this body is zero
(C) of gravitational pull
(D) friction between body and the water

Answer: B

Question. In which of the following activity, friction is useful?
(A) driving a car
(B) hitting a ball with bat
(C) rowing a boat
(D) sitting on a chair

Answer: D

Question. Which of the following is not a type of force?
(A) muscular
(B) magnetic
(C) chemical
(D) pulling a bucket of water from a well

Answer: C

Question. The atmospheric pressure is due to the:
(A) sky above our head
(B) air mass surrounding earth
(C) gravitational force of sun and other planets
(D) mass of the earth

Answer: B

Question. The pressure exerted by a liquid:
(A) increases with depth
(B) decreases with depth
(C) is constant
(D) first increases then decreases

Answer: A

Question. Which of the following statement is not true.
(A) A freely falling body is acted upon by gravitational force
(B) Pressure on top of mount everest is much more than 1 atm
(C) S.I. unit of pressure is pascal
(D) The blood vessels in our body maintains the internal pressure equal to the atmospheric pressure

Answer: B

Question. In which of the following cases the net force is not equal to zero?
(A) A kite skillfully held stationary in the sky
(B) A ball falling feeely from a height
(C) A helicopter hovering above the ground
(D) A cork floating on the surface of water

Answer: B

Question. Friction force is responsible changing:
(A) shape of an object
(B) direction of an object
(C) speed of an object
(D) all of the above

Answer: C

Question. Thrust is:
(A) Force X area
(B) Force / Area
(C) Pressure
(D) Pressure X Area

Answer: D

Question. A force of 16 N is distributed uniformly on one surface of a cube of edge '8' cm. The pressure on this surface is: 

(A) 3500pa
(B) 2500 pa
(C) 4500 pa
(D) 2000 pa

Answer: B

Q1. Define the following terms:

i) Force ii) Pressure iii) Streamline body

Q2. Name the following:

i) The force acting opposite to the kinetic friction.

ii) The instrument used to measure the pressure difference.

iii) Pressure exerted by the atmosphere.

iv) Force exerted by the earth.

Q3. Answer the following questions:

i) How is the gravitational force related to the mass of an object?

ii) Why can’t we use a beam balance to measure the weight of a body?

iii) Give two examples each of harmful friction and useful friction.

iv) How is the pressure in the liquids related to the depth?

v) How do the rockets sent to space do not fall back on the earth?

vi) What will be the weight of an object on Jupiter, whose weight is 1000 Kg on the earth?

vii) Why the cutting edge of a knife is made sharp?

Please click the link below to download CBSE Class 8 Science Force and Pressure Assignment Set A