Universal Law of Gravitation — Homi Bhabha Exam Physics MCQs with Solutions
Free Homi Bhabha Exam Physics Universal Law of Gravitation MCQs with step-by-step solutions (6 questions). Part of Gravitation & Pressure. Practise online on Prepizo — no login needed.
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Questions with solutions
Q1 — Universal Law of Gravitation · medium · theory
According to Newton's universal law of gravitation, the force between two masses is:
A. directly proportional to the distance between them
B. independent of the distance between them
C. directly proportional to the product of the masses and inversely proportional to the square of the distance ✓ Correct
D. inversely proportional to the product of the masses
Solution: $F = \dfrac{G m_1 m_2}{r^2}$ — proportional to $m_1 m_2$ and inversely proportional to $r^2$.
Q2 — Universal Law of Gravitation · hard · numerical
If the distance between two bodies is doubled, the gravitational force between them becomes:
A. double
B. one-fourth ✓ Correct
C. one-half
D. four times
Solution: Since $F \propto \dfrac{1}{r^2}$, doubling $r$ makes $F$ become $\dfrac{1}{2^2} = \dfrac{1}{4}$ of the original.
Q3 — Universal Law of Gravitation · hard · numerical
If both masses are doubled while the distance between them is kept the same, the gravitational force becomes:
A. 2 times
B. unchanged
C. 4 times ✓ Correct
D. half
Solution: $F \propto m_1 m_2$; doubling both masses multiplies the force by $2 \times 2 = 4$.
Q4 — Universal Law of Gravitation · medium · theory
We do not notice the gravitational force of attraction between everyday objects because:
A. gravity acts only on large planets
B. friction cancels gravity
C. the gravitational constant G is extremely small ✓ Correct
D. small objects have no mass
Solution: G $\approx 6.67\times10^{-11}$ is so tiny that the force between ordinary masses is negligible.
Q5 — Universal Law of Gravitation · medium · theory
The gravitational force between two bodies is always:
A. repulsive
B. zero
C. sometimes attractive, sometimes repulsive
D. attractive ✓ Correct
Solution: Gravitation is always an attractive force between masses.
Q6 — Universal Law of Gravitation · hard · numerical
If the distance between two masses is reduced to half, the gravitational force becomes:
A. 2 times
B. 4 times ✓ Correct
C. one-fourth
D. half
Solution: $F \propto \dfrac{1}{r^2}$; halving $r$ multiplies the force by $\dfrac{1}{(1/2)^2} = 4$.