Learn › Class 8 CBSE · Science › Friction
Friction — Class 8 CBSE Science MCQs with Solutions
Free Class 8 CBSE Science Friction MCQs with step-by-step solutions. Practise online on Prepizo — no login needed.
▶ Practise Friction online (free)
Sample questions with solutions
Q1 — easy
Which surface produces the most friction?
A. polished marble
B. glass
C. rough sandpaper ✓ Correct
D. wet ice
Solution: Rougher surfaces create more friction.
Q2 — easy
Substances applied to reduce friction are called:
A. adhesives
B. lubricants ✓ Correct
C. solvents
D. fuels
Solution: Oil and grease act as lubricants.
Q3 — easy
Walking is possible because of:
A. friction between feet and ground ✓ Correct
B. gravity only
C. air pressure
D. magnetism
Solution: Friction gives the grip needed to push off.
Q4 — hard
Sliding friction is slightly less than static friction because:
A. moving surfaces get no time to interlock fully ✓ Correct
B. moving objects are lighter
C. motion removes gravity
D. the surfaces become smooth
Solution: Contact points have less time to lock together.
Q5 — hard
Why does a matchstick light when struck on a rough surface?
A. Chemicals react in the dark
B. Friction produces heat that ignites the chemicals ✓ Correct
C. The stick is magnetic
D. Air pressure ignites it
Solution: Friction converts motion into heat.
Q6 — hard
Which situation shows friction being useful rather than wasteful?
A. worn-out shoe soles
B. brakes stopping a bicycle ✓ Correct
C. machine parts heating up
D. engine wear
Solution: Brakes rely on friction to stop motion.
Q7 — medium
The friction that must be overcome to start moving a stationary object is:
A. rolling friction
B. static friction ✓ Correct
C. sliding friction
D. fluid friction
Solution: Static friction acts before motion begins.
Q8 — medium
The friction exerted by air on a moving object is called:
A. drag ✓ Correct
B. thrust
C. tension
D. weight
Solution: Fluid friction on a body moving through air is drag.
Q9 — medium
The soles of shoes have grooves in order to:
A. look attractive
B. increase friction and prevent slipping ✓ Correct
C. reduce weight
D. reduce friction
Solution: Grooves improve grip.