Due to the Earth's rotation, the acceleration due to gravity (g) is minimum at: MCQ with Answer and Explanation

Due to the Earth's rotation, the acceleration due to gravity (g) is minimum at:
A. The Equator
B. The North Pole
C. The South Pole
D. A latitude of 45 degrees
Answer: Option A
Solution (By JKSSB Mock Tests)
The effective acceleration due to gravity at latitude lambda is g' = g - R * w^2 * cos^2(lambda), where w is angular velocity. At the equator, lambda = 0, so cos(0) = 1. This subtracts the maximum outward centrifugal acceleration (Rw^2) from g. At the poles, lambda = 90, centrifugal effect is zero. Thus, g is minimum exactly at the equator.

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Practice More Physics Questions

Question #1
A body moves with uniform acceleration. The graph between velocity and time is:
A. Straight line with positive slope
B. Straight line parallel to time axis
C. Hyperbola
D. Parabola

Correct Answer: Option A


Explanation:
Uniform acceleration means constant rate of change of velocity: a = dv/dt = constant. Thus v = u + at, a linear equation in t. Graph is straight line with slope = acceleration. Parallel to time axis (A) implies zero acceleration (constant velocity). Parabola (C) is for position-time under constant acceleration. Memory tip: 'v-t graph slope = acceleration; area = displacement'. This graph interpretation question tests kinematics fundamentals, frequently examined in competitive exams. Always link graph features to physical quantities: slope, area, intercepts have specific meanings in motion graphs.

This question belongs to: Science Physics
Question #2
Temperature where Fahrenheit reading is double Celsius reading:
A. 40°C
B. 320°C
C. 80°C
D. 160°C

Correct Answer: Option D


Explanation:
F = (9/5)C + 32. Given F = 2C: 2C = 1.8C + 32 ⇒ 0.2C = 32 ⇒ C = 160°. Verify: F = 2×160 = 320°; formula: (9/5)×160+32 = 288+32 = 320°. Memory aid: Solve linear equation for temperature conversion problems. Algebraic manipulation of scale relations frequently tested in competitive exams.

This question belongs to: Science Physics
Question #3
When a body falls freely under gravity, which statement is correct?
A. Potential energy increases
B. Kinetic energy decreases
C. Total energy is not conserved
D. Mechanical energy remains constant

Correct Answer: Option D


Explanation:
In free fall under gravity alone, mechanical energy (kinetic + potential) is conserved, assuming no air resistance. Potential energy decreases while kinetic energy increases, sum constant. Law of conservation of mechanical energy. Non-conservative forces absent.

This question belongs to: Science Physics