1.The force that attracts objects toward the center of the Earth is called:
A) Magnetism
B) Friction
C) Gravity
D) Electricity
Answer: C
2. The unit of gravitational force in SI system is:
A) Joule
B) Newton
C) Watt
D) Pascal
Answer: B
3. Who discovered the law of universal gravitation?
A) Albert Einstein
B) Isaac Newton
C) Galileo Galilei
D) Nikola Tesla
Answer: B
4. The acceleration due to gravity on Earth is approximately:
A) 5.8 m/s²
B) 7.2 m/s²
C) 9.8 m/s²
D) 12 m/s²
Answer: C
5. Gravity between two objects depends on:
A) Their color
B) Their temperature
C) Their masses
D) Their shape
Answer: C
6. If the mass of an object increases, its gravitational pull will:
A) Decrease
B) Remain same
C) Increase
D) Become zero
Answer: C
7. The gravitational force between two objects decreases when:
A) Distance increases
B) Mass increases
C) Temperature rises
D) Volume increases
Answer: A
8. Weight is the measure of:
A) Mass
B) Density
C) Gravitational force
D) Pressure
Answer: C
9. The weight of an object on the Moon is about:
A) Equal to Earth
B) Half of Earth
C) One-sixth of Earth
D) Double of Earth
Answer: C
10. The formula for gravitational force is:
A) F = ma
B) F = Gm₁m₂/r²
C) E = mc²
D) V = IR
Answer: B
11. The constant ‘G’ in gravitation equation is called:
A) Gravity factor
B) Gravitational constant
C) General force
D) Geometric constant
Answer: B
12. Which of the following has the least gravity?
A) Earth
B) Moon
C) Jupiter
D) Sun
Answer: B
13. The force of gravity keeps planets in:
A) Straight lines
B) Random motion
C) Orbit around the Sun
D) Still position
Answer: C
14. On which planet is gravity strongest?
A) Mars
B) Venus
C) Jupiter
D) Mercury
Answer: C
15. If there were no gravity on Earth, we would:
A) Walk normally
B) Float in air
C) Become heavier
D) Move faster
Answer: B
16. The gravitational force acts between:
A) Only large bodies
B) Only planets
C) Only living things
D) All objects with mass
Answer: D
17. A freely falling object moves under the influence of:
A) Magnetism
B) Air pressure
C) Gravity only
D) Friction only
Answer: C
18. The value of ‘g’ at the equator is:
A) Maximum
B) Minimum
C) Zero
D) Infinite
Answer: B
19. Escape velocity is the speed needed to:
A) Stop falling
B) Leave Earth’s gravity
C) Increase weight
D) Orbit the Moon
Answer: B
20. The approximate escape velocity of Earth is:
A) 5 km/s
B) 7 km/s
C) 11.2 km/s
D) 15 km/s
Answer: C
21. The weight of a body becomes zero at:
A) Earth’s surface
B) Center of Earth
C) Top of mountain
D) Sea level
Answer: B
22. Which instrument measures weight?
A) Barometer
B) Thermometer
C) Spring balance
D) Ammeter
Answer: C
23. The gravitational force between two objects is directly proportional to:
A) Square of distance
B) Product of their masses
C) Temperature
D) Volume
Answer: B
24. Tides in oceans are mainly caused by gravity of the:
A) Sun only
B) Moon only
C) Moon and Sun
D) Earth only
Answer: C
25. If distance between two masses is doubled, gravitational force becomes:
A) Double
B) Half
C) One-fourth
D) Four times
Answer: C
26. Mass of an object is measured in:
A) Newton
B) Kilogram
C) Joule
D) Meter
Answer: B
27. Artificial satellites revolve around Earth due to:
A) Air pressure
B) Magnetic field
C) Gravitational force
D) Solar energy
Answer: C
28. A person feels lighter in water because of:
A) Increased gravity
B) Decreased mass
C) Upthrust (buoyant force)
D) Friction
Answer: C
29. The force of gravity on Mars is compared to Earth:
A) Greater
B) Equal
C) Less
D) Zero
Answer: C
30. The phenomenon of objects falling towards Earth was first scientifically explained by:
A) Isaac Newton
B) Stephen Hawking
C) Michael Faraday
D) James Clerk Maxwell
Answer: A