Chapter Exam

Unit 9: Gravitation — Online MCQ Test

Q: What is the SI unit of the universal gravitational constant G?

Answer: A. N m^2 kg^-2 — The universal gravitational constant appears in Newton's law of gravitation as F = G m1 m2 / r^2, so its SI unit is N m^2 kg^-2.

Q: The acceleration due to gravity on the surface of the Earth is approximately:

Answer: A. 9.8 m/s^2 — The standard value of acceleration due to gravity near Earth's surface is about 9.8 m/s^2.

Q: If the distance between two masses is doubled, the gravitational force between them becomes:

Answer: C. one-fourth — According to Newton's law of gravitation, force varies inversely as the square of distance. So doubling the distance reduces the force to one-fourth.

Q: A body is taken from the Earth's surface to a depth equal to half the Earth's radius. Assuming uniform density, the acceleration due to gravity becomes:

Answer: B. g/2 — Inside a uniform Earth, acceleration due to gravity decreases linearly with depth: g' = g(1 - d/R). For d = R/2, g' = g/2.

PHYSICS · CLASS 11 INTERMEDIATE 1 YEAR · Telangana State Board

Practice Unit 9: Gravitation with a free chapter-wise online MCQ test for Telangana State Board CLASS 11 INTERMEDIATE 1 YEAR PHYSICS. This chapter covers: Focusing on celestial mechanics this chapter details Universal Law of Gravitation acceleration due to gravity variation with altitude and depth Kepler laws escape speed orbital vel.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Unit 9: Gravitation — Important Questions & Answers (FAQ)

Frequently asked questions from Telangana State Board CLASS 11 INTERMEDIATE 1 YEAR PHYSICS — Unit 9: Gravitation, with answers and explanations. These are sample questions; the exam has its own separate question set.

What is the SI unit of the universal gravitational constant G?

A. N m^2 kg^-2 ✓
B. N kg^-2 m^2
C. kg m^2 s^-2
D. m s^-2

Answer: A. N m^2 kg^-2
The universal gravitational constant appears in Newton's law of gravitation as F = G m1 m2 / r^2, so its SI unit is N m^2 kg^-2.

The acceleration due to gravity on the surface of the Earth is approximately:

A. 9.8 m/s^2 ✓
B. 98 m/s^2
C. 0.98 m/s^2
D. 1.8 m/s^2

Answer: A. 9.8 m/s^2
The standard value of acceleration due to gravity near Earth's surface is about 9.8 m/s^2.

If the distance between two masses is doubled, the gravitational force between them becomes:

A. twice
B. half
C. one-fourth ✓
D. four times

Answer: C. one-fourth
According to Newton's law of gravitation, force varies inversely as the square of distance. So doubling the distance reduces the force to one-fourth.

A body is taken from the Earth's surface to a depth equal to half the Earth's radius. Assuming uniform density, the acceleration due to gravity becomes:

A. g
B. g/2 ✓
C. g/4
D. zero

Answer: B. g/2
Inside a uniform Earth, acceleration due to gravity decreases linearly with depth: g' = g(1 - d/R). For d = R/2, g' = g/2.

A geostationary satellite must have which of the following conditions?

A. Orbit perpendicular to the equator and time period of 12 hours
B. Orbit in the equatorial plane and time period equal to Earth's rotation period ✓
C. Any orbit with period less than 24 hours
D. Polar orbit with speed equal to escape speed

Answer: B. Orbit in the equatorial plane and time period equal to Earth's rotation period
For a satellite to appear fixed over one point on Earth, it must orbit in the equatorial plane with a period equal to Earth's rotation period.

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