Chapter Exam

Chapter 6: Gravitation — Online MCQ Test

Q: The constant of proportionality G in Newton's law of gravitation is known as:

Answer: B. Universal gravitational constant — G is called the Universal Gravitational Constant with a value of 6.67 x 10^-11 Nm^2/kg^2.

Q: Which of Kepler's laws is also known as the Law of Periods?

Answer: C. Third Law — Kepler's third law states that the square of the period of revolution is proportional to the cube of the semi-major axis.

Q: If the Earth were to stop rotating, the weight of a body at the equator would:

Answer: A. Increase — Weight at the equator is mg - m(omega^2)R; if rotation stops, the centrifugal term becomes zero, increasing effective weight.

Q: If the mass of the Earth were doubled and its radius halved, the new value of 'g' would be:

Answer: C. 8g — g' = G(2M)/(R/2)^2 = 8 * GM/R^2 = 8g.

Q: If the distance between the Earth and the Sun were half of its present value, the number of days in a year would be approximately:

Answer: B. 129 — By Kepler's Third Law, T^2 proportional to r^3. T' = T * (1/2)^(3/2) = 365 / 2.828 = 129 days.

PHYSICS · CLASS 11th · Tamil Nadu State Board

Practice Chapter 6: Gravitation with a free chapter-wise online MCQ test for Tamil Nadu State Board CLASS 11th PHYSICS. This chapter covers: Focusing on celestial mechanics this chapter details Kepler laws Newton law of gravitation gravitational potential energy and field intensity. Students examine acceleration due to.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 6: Gravitation — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board CLASS 11th PHYSICS — Chapter 6: Gravitation, with answers and explanations. These are sample questions; the exam has its own separate question set.

The constant of proportionality G in Newton's law of gravitation is known as:

A. Acceleration due to gravity
B. Universal gravitational constant ✓
C. Gravitational intensity
D. Gravitational potential

Answer: B. Universal gravitational constant
G is called the Universal Gravitational Constant with a value of 6.67 x 10^-11 Nm^2/kg^2.

Which of Kepler's laws is also known as the Law of Periods?

A. First Law
B. Second Law
C. Third Law ✓
D. None of these

Answer: C. Third Law
Kepler's third law states that the square of the period of revolution is proportional to the cube of the semi-major axis.

If the Earth were to stop rotating, the weight of a body at the equator would:

A. Increase ✓
B. Decrease
C. Remain the same
D. Become zero

Answer: A. Increase
Weight at the equator is mg - m(omega^2)R; if rotation stops, the centrifugal term becomes zero, increasing effective weight.

If the mass of the Earth were doubled and its radius halved, the new value of 'g' would be:

A. 2g
B. 4g
C. 8g ✓
D. g

Answer: C. 8g
g' = G(2M)/(R/2)^2 = 8 * GM/R^2 = 8g.

If the distance between the Earth and the Sun were half of its present value, the number of days in a year would be approximately:

A. 64.5
B. 129 ✓
C. 182.5
D. 730

Answer: B. 129
By Kepler's Third Law, T^2 proportional to r^3. T' = T * (1/2)^(3/2) = 365 / 2.828 = 129 days.

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