Chapter 9 PHYSICAL SCIENCE : Gravitation — Online MCQ Test
SCIENCE · CLASS 9th · Andhra State Board
Practice Chapter 9 PHYSICAL SCIENCE : Gravitation with a free chapter-wise online MCQ test.
This chapter covers: This chapter covers Universal Law of Gravitation free fall acceleration due to gravity mass weight thrust pressure Archimedes principle and buoyancy..
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Chapter 9 PHYSICAL SCIENCE : Gravitation — Important Questions & Answers
What is the SI unit of force?
- A. Newton
- B. Joule
- C. Pascal
- D. Watt
Answer: A. Newton
The SI unit of force is newton (N). It is defined using mass and acceleration.
The SI unit of force is newton (N). It is defined using mass and acceleration.
The force with which Earth attracts objects toward its center is called ________.
- A. Magnetic force
- B. Gravitational force
- C. Frictional force
- D. Electrostatic force
Answer: B. Gravitational force
Gravity is the attractive force between any two masses, and Earth’s pull on objects is gravitational force.
Gravity is the attractive force between any two masses, and Earth’s pull on objects is gravitational force.
If the mass of an object is doubled, what happens to its weight at the same place?
- A. It becomes half
- B. It becomes double
- C. It becomes four times
- D. It remains same
Answer: B. It becomes double
Weight is directly proportional to mass because W = mg. If mass doubles, weight also doubles.
Weight is directly proportional to mass because W = mg. If mass doubles, weight also doubles.
A stone and a feather are dropped from the same height in a vacuum. Which statement is correct?
- A. The stone falls faster because it is heavier
- B. The feather falls faster because it is lighter
- C. Both reach the ground at the same time
- D. The feather does not fall at all
Answer: C. Both reach the ground at the same time
In a vacuum, there is no air resistance, so all bodies fall with the same acceleration due to gravity.
In a vacuum, there is no air resistance, so all bodies fall with the same acceleration due to gravity.
A student says: 'Weight is a property of matter that never changes.' Which option correctly identifies the error?
- A. Weight is a scalar quantity and never changes
- B. Weight depends on the value of g, so it changes from place to place
- C. Mass depends on gravity, not weight
- D. Weight is measured in kilograms
Answer: B. Weight depends on the value of g, so it changes from place to place
Weight is the gravitational force on a body and changes with the local value of g. Mass, not weight, remains constant.
Weight is the gravitational force on a body and changes with the local value of g. Mass, not weight, remains constant.