The gravitational constant G has dimensions MCQ with Answer and Explanation

The gravitational constant G has dimensions
A. [ML²T⁻²]
B. [M⁻¹L³T⁻²]
C. [M⁻²L³T⁻²]
D. [M⁻¹L³T⁻¹]
Answer: Option B
Solution (By JKSSB Mock Tests)
F = G m1 m2 / r² => G = F r² / (m1 m2) => [MLT⁻²][L²]/[M²] = [M⁻¹L³T⁻²].

Discuss this Question (0)

No comments yet. Be the first to start the discussion!

Practice More Physics Questions

Question #1
A body at 100°C is placed in contact with a body at 0°C. Heat flow stops when
A. Thermal equilibrium is reached
B. Heat content becomes equal
C. Both reach 100°C
D. Both reach 0°C

Correct Answer: Option A


Explanation:
Heat flows until temperatures equal, i.e., thermal equilibrium. Not necessarily 50°C unless heat capacities equal.

This question belongs to: Science Physics
Question #2
A person cannot see objects clearly beyond 2 m. This defect of vision is:
A. Astigmatism
B. Presbyopia
C. Myopia
D. Hypermetropia

Correct Answer: Option C


Explanation:
Myopia (nearsightedness) is the inability to see distant objects clearly, with far point less than infinity. Here, far point is 2 m. Corrected using concave lens. Hypermetropia (farsightedness) affects near vision; presbyopia is age-related loss of accommodation; astigmatism involves uneven corneal curvature. Memory aid: 'Myopia = near-sighted; far point reduced'. This application question tests knowledge of vision defects and corrections, frequently appearing in competitive exams. Always link symptom (blurred distant vision) to defect (myopia) and correction (diverging lens).

This question belongs to: Science Physics
Question #3
A sound wave has time period 0.01 s. Its frequency is
A. 0.1 Hz
B. 100 Hz
C. 10 Hz
D. 1000 Hz

Correct Answer: Option B


Explanation:
f = 1/T = 1/0.01 = 100 Hz.

This question belongs to: Science Physics