Gravitation (9 Science)
Gravitation is the force of attraction between all objects in the universe, discovered and explained by Newton. Understanding gravity is essential for unde
TL;DR: Gravitation is the force of attraction between all objects in the universe, discovered and explained by Newton. Understanding gravity is essential for…
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Gravitation is the force of attraction between all objects in the universe, discovered and explained by Newton. Understanding gravity is essential for unde
Gravitation MCQs with Answers & Explanations
Q1. Newton's law of universal gravitation states that the gravitational force between two objects is:
- Directly proportional to the sum of their masses
- Inversely proportional to the square of distance between them ✓ (correct)
- Independent of their masses
- Directly proportional to the distance between them
Q2. The gravitational constant G is approximately:
- 6.67 x 10^-11 N m^2/kg^2 ✓ (correct)
- 9.8 m/s^2
- 10^-11 N/kg
- 6.67 x 10^11 N m^2/kg^2
Q3. The weight of an object is:
- The amount of matter in the object
- The gravitational force exerted on the object ✓ (correct)
- The same everywhere
- Independent of mass
Q4. Acceleration due to gravity at Earth's surface is approximately:
- 6.67 m/s^2
- 9.8 m/s^2 ✓ (correct)
- 10 m/s^2
- 15 m/s^2
Q5. If the mass of an object is doubled, its weight becomes:
- Same
- Half
- Double ✓ (correct)
- Quarter
Q6. An astronaut weighs 100 N on Earth. On the Moon, where g = 1.6 m/s^2, the astronaut's weight would be approximately:
- 100 N
- 16 N
- 60 N ✓ (correct)
- 1000 N
Q7. The orbital velocity of a satellite depends on:
- Its mass
- The radius of orbit
- Both mass and radius of orbit
- Only the planet's mass and radius of orbit ✓ (correct)
Q8. Free fall is a motion where:
- Only gravitational force acts ✓ (correct)
- No force acts
- Resistance is maximum
- Velocity is constant
Q9. If the distance between two objects is doubled, the gravitational force becomes:
- Double
- Half
- One-fourth ✓ (correct)
- Four times
Q10. Mass is different from weight because:
- They have the same definition
- Mass is matter quantity, weight is gravitational force ✓ (correct)
- Weight is constant everywhere
- Mass changes with location
Frequently Asked Questions
Why do objects fall at the same rate on Earth regardless of their mass?
Acceleration due to gravity is constant (9.8 m/s^2) for all objects near Earth's surface, independent of their mass.
How does gravity work in space where there is no air resistance?
Gravity acts on objects regardless of the medium, causing them to accelerate toward the massive body due to gravitational force.
More 9 Science MCQs
- Light Reflection and Refraction
- Electricity
- Acids Bases and Salts
- Life Processes
- Carbon and its Compounds
- Metals and Non-metals
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