1. Which is the weakest of all fundamental forces?
a) Gravitational force
b) Electrostatic force
c) Magnetic force
d) Nuclear force
Answer: a
2. What kind of force acts on a car moving around a curve?
a) Centrifugal force
b) Cohesive force
c) Centripetal force
d) Gravitational force
Answer: c
3. When a person kicks a stone and gets hurt, it is due to:
a) Inertia
b) Velocity
c) Reaction
d) Momentum
Answer: c
4. Which contact force is responsible for changing the motion of an object?
a) Magnetic force
b) Frictional force
c) Muscular force
d) Electrostatic force
Answer: b
5. Friction arises due to which factor on surfaces in contact?
a) Surface irregularities
b) Smoothness
c) Density
d) Gaps
Answer: a
6. The friction between two surfaces increases if:
a) A lubricant is applied
b) The surfaces are pressed harder
c) Air is introduced between the surfaces
d) Irregularities are removed
Answer: b
7. The direction of torque is:
a) Perpendicular to the applied force
b) Same as the applied force
c) Opposite to the applied force
d) Parallel to the radius
Answer: a
8. When two ice cubes are pressed together and form one, the force holding them together is:
a) Hydrogen bonding
b) Van der Waals forces
c) Covalent attraction
d) Dipole interaction
Answer: a
9. When two ice cubes stick together after being pressed, it’s primarily due to:
a) Surface tension
b) Density difference
c) Reaction force
d) Momentum
Answer: a
10. Which of the following is a result of surface tension?
a) Gravitational pull
b) Viscosity
c) Capillary action
d) Radiation
Answer: c
11. Why does an oil drop spread on water?
a) Oil is lighter than water
b) Oil is more viscous
c) Oil doesn’t mix with water
d) Oil has lower surface tension than water
Answer: d
12. Why does an iron needle float on water when placed gently?
a) Surface tension
b) Density
c) Reaction
d) Momentum
Answer: a
13. Water from soil enters root hairs due to:
a) Atmospheric pressure
b) Capillary pressure
c) Root pressure
d) Osmotic pressure
Answer: d
14. The walls of a dam are thicker at the bottom to:
a) Streamline water flow
b) Withstand increased pressure with depth
c) Resist horizontal pressure
d) Balance atmospheric pressure
Answer: b
15. What is the weight of a body at Earth’s center?
a) Half the surface weight
b) Zero
c) Twice the surface weight
d) Infinite
Answer: b
16. A cyclist turning in a circular path should lean:
a) Forward
b) Backward
c) Towards the center
d) Away from the center
Answer: c
17. If an object’s displacement is proportional to the square of time, its acceleration is:
a) Increasing
b) Decreasing
c) Zero
d) Constant
Answer: d
18. What type of motion does a train exhibit?
a) Rotatory motion
b) Spin motion
c) Projectile motion
d) Translatory motion
Answer: d
19. What path will a dropped ball from a uniformly moving train follow according to a platform observer?
a) Straight line
b) Circular
c) Parabolic
d) None of these
Answer: c
20. If a body completes one circular path in 1 second, what is its average velocity?
a) Depends on time taken
b) Equal to average speed
c) One unit
d) Zero
Answer: d