Class 9 Science Gravitation
Class 9 Science Gravitation Fill in the blanks , Multiple Choice Question [mcq] and True false .
Fill in the Blanks
1. The force that pulls objects towards the Earth is called gravitational force.
2. The value of gravitational acceleration on Earth is approximately 9.8 m/s².
3. The force of gravity acts on every object in the universe.
4. The mass of an object remains the same everywhere.
5. The weight of an object depends on the value of g.
6. Weight is equal to mass × gravitational acceleration (g).
7. Objects fall towards the Earth due to the force of gravity.
8. An object is said to be in free fall if only gravity acts on it.
9. The SI unit of weight is newton (N).
10. The weight of an object on the Moon is 1/6 of its weight on Earth.
11. The force of attraction between any two objects is called gravitational force.
12. The force that keeps the moon in orbit is centripetal force.
13. Pressure is defined as force per unit area.
14. Archimedes’ Principle is related to buoyancy.
Multiple Choice Questions
1. What is the SI unit of force?
a) Kilogram
b) Pascal
c) Newton ✅
d) Joule
2. Who gave the Universal Law of Gravitation?
a) Einstein
b) Galileo
c) Newton ✅
d) Faraday
3. What happens to gravitational force if distance is doubled?
a) Becomes double
b) Becomes half
c) Becomes four times
d) Becomes one-fourth ✅
4. Which force keeps the moon in orbit?
a) Centrifugal
b) Magnetic
c) Centripetal ✅
d) Nuclear
5. What is the value of g on the Moon?
a) 9.8 m/s²
b) 0 m/s²
c) 1.63 m/s² ✅
d) 19.6 m/s²
6. What is the formula for weight?
a) W = m/g
b) W = m × g ✅
c) W = g/m
d) W = m² × g
7. Which of the following is a unit of pressure?
a) kg/m
b) N
c) N/m² ✅
d) m/s
8. Pressure is __ on a smaller area.
a) Less
b) More ✅
c) Same
d) Zero
9. Which quantity is constant everywhere?
a) Weight
b) Force
c) Mass ✅
d) Pressure
10. What does Archimedes’ principle relate to?
a) Pressure
b) Weight
c) Gravity
d) Buoyancy ✅
11. What is buoyant force?
a) Upward force by fluid ✅
b) Downward force by air
c) Weight of object
d) Frictional force
12. Which object will float on water?
a) Iron nail
b) Stone
c) Cork ✅
d) Gold
13. What happens to weight when you go to the Moon?
a) Increases
b) Becomes same
c) Becomes zero
d) Decreases ✅
14. What happens to pressure if area increases?
a) Increases
b) Decreases ✅
c) Remains same
d) Becomes infinite
15. What is the direction of buoyant force?
a) Sideways
b) Downwards
c) Upwards ✅
d) Random
True/False Questions
1. Gravity only acts on Earth. – False
2. Mass changes when you go to the Moon. – False
3. Weight is a type of force. – True
4. The Moon pulls the Earth with less force than the Earth pulls the Moon. – False
5. Buoyant force always acts downwards. – False
6. Pressure depends on area. – True
7. Archimedes was a Roman scientist. – False
8. The value of G changes from place to place. – False
9. A sharp knife cuts better because it applies more pressure. – True
10. In free fall, air resistance does not act. – True
11. Gravity is the weakest of all fundamental forces. – True
12. The value of g is more at the equator than at the poles. – False
13. A body in water weighs less due to buoyant force. – True
14. Acceleration due to gravity is a vector quantity. – True
15. A heavy object falls faster than a light object in vacuum. – False
