The value of g at the centre of Earth is MCQ with Answer and Explanation

Question

Share Report Error

The value of g at the centre of Earth is

A. 9.8 m/s²

B. Zero

C. 4.9 m/s²

D. Infinite

Answer: Option B

Solution (By JKSSB Mock Tests)

g decreases with depth: g' = g(1 - d/R). At centre d=R, g'=0. Weightless at centre. At poles g=9.83, equator 9.78. At surface it's maximum.

This question belongs to: Science Physics

Request complete Subject PDF

Discuss this Question (0)

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

Practice More Physics Questions

Question #1

The efficiency of a machine is 80%. If it lifts a load of 500 N through 2 m, effort applied through 10 m. Effort is

A. 125 N

B. 80 N

C. 100 N

D. 200 N

View Answer & Solution Discuss

Get Complete Subject PDF for Science

Correct Answer: Option A

Explanation:
Work output = 500×2=1000 J. Work input = output/eff = 1000/0.8=1250 J. Effort = Work input / distance = 1250/10 = 125 N.

This question belongs to: Science Physics

Question #2

A body moves along a straight line with v = 2t + 3. Acceleration after 2 s is

A. 5 m/s²

B. 3 m/s²

C. 2 m/s²

D. 7 m/s²

View Answer & Solution Discuss

Get Complete Subject PDF for Science

Correct Answer: Option C

Explanation:
a = dv/dt = 2, constant.

This question belongs to: Science Physics

Question #3

The specific heat capacity of water is exceptionally high. This property is primarily responsible for:

A. Water being a good conductor of electricity.

B. The formation of sea breezes and land breezes.

C. Water expanding upon freezing.

D. Water having high surface tension.

View Answer & Solution Discuss

Get Complete Subject PDF for Science

Correct Answer: Option B

Explanation:
Water has a specific heat capacity of 4184 J/kg·K, which is very high. This means it heats up and cools down much more slowly than land. During the day, land heats faster than the sea, causing air above it to rise and cool air from the sea to rush in (sea breeze). The reverse happens at night (land breeze).

This question belongs to: Science Physics

Explore All Physics MCQs