1. Who first determined the value of the gravitational constant (G)?
a) R.R. Heyl
b) Boyle
c) Poynting
d) Lord Cavendish
Answer: d
2. Who formulated the law of gravitation?
a) Newton
b) Galileo
c) Archimedes
d) Faraday
Answer: a
3. According to Newton’s Law of Gravitation, the force between two bodies is:
a) Directly proportional to the product of their masses
b) Directly proportional to the distance between them
c) Directly proportional to the product of their radii
d) Directly proportional to the product of their forces
Answer: a
4. What happens to the value of ‘g’ if Earth’s radius is decreased by 1% with no change in mass?
a) It decreases by 0.2%
b) It increases by 2%
c) It decreases by 2%
d) It increases by 0.5%
Answer: b
5. If Earth’s radius decreases and mass remains constant, gravitational acceleration will:
a) Decrease
b) Increase
c) Remain unchanged
d) Become zero
Answer: b
6. What is the value of acceleration due to gravity at the center of the Earth?
a) 1
b) 0
c) -1
d) Infinite
Answer: b
7. The weight of a body acts through its:
a) Center of gravity
b) Center of mass
c) Both a and b
d) Buoyant point
Answer: a
8. The atmospheric air is held to Earth due to:
a) Earth’s rotation
b) Wind pressure
c) Gravity
d) Clouds
Answer: c
9. Where is the weight of an object maximum on Earth?
a) At the poles
b) At the equator
c) At the Tropic of Cancer
d) At the Tropic of Capricorn
Answer: a
10. What is the approximate height of a geostationary satellite from Earth’s surface?
a) 30,000 km
b) 36,000 km
c) 45,000 km
d) 48,000 km
Answer: b
11. The time period of revolution for a geostationary satellite is:
a) 365 days
b) 30 days
c) 24 hours
d) Continuously changing
Answer: c
12. What is the minimum number of geostationary satellites needed for complete global coverage?
a) 1
b) 2
c) 3
d) 4
Answer: c
13. A spoon dropped by an astronaut in a satellite will:
a) Fall to the floor
b) Remain stationary
c) Follow the motion of the satellite
d) Move tangentially away
Answer: c
14. What happens if an object is dropped from a height with no air resistance?
a) Falls with constant speed and acceleration
b) Acceleration increases
c) Speed and acceleration both increase
d) Speed increases
Answer: d
15. If a falling object reaches the ground in 1 second, its velocity at impact is:
a) 4.9 m/s
b) 9.8 m/s
c) 14.7 m/s
d) 19.6 m/s
Answer: b
16. If there were no gravity, which of the following would not exist for a fluid?
a) Viscosity
b) Surface tension
c) Pressure
d) Buoyant force (upward thrust)
Answer: d
17. A man at the top of a tower drops sphere A vertically and throws sphere B horizontally at the same time. What happens?
a) Both hit the ground simultaneously
b) A hits the ground first
c) B hits the ground first
d) Not enough information (mass not given)
Answer: a
18. What is the apparent weight of a person in a lift accelerating downwards?
a) Greater than real weight
b) Equal to real weight
c) Less than real weight
d) Zero
Answer: c
19. The mass measured in a stationary lift is m. When the lift moves upward with acceleration a, the mass will appear as:
a) m(1 – a/g)
b) m(1 + a/g)
c) m
d) 0
Answer: c
20. The point at which the total mass of a body appears to be concentrated is called:
a) Dead center
b) Center of gravity
c) Center of motion
d) Center of mass
Answer: d
21. Consider the following statements:
- A geostationary satellite is approximately 10,000 km above Earth.
- FM transmission provides good audio quality because it’s less affected by noise.
Which statement is correct?
a) Only 1
b) Only 2
c) Both 1 and 2
d) Neither
Answer: b
22. What is the shape of our Milky Way galaxy?
a) Circular
b) Elliptical
c) Spiral
d) None of the above
Answer: b