Class 9 Science Gravitation

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