The number of significant figures in 0.02040 is MCQ with Answer and Explanation

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The number of significant figures in 0.02040 is

A. 2

B. 5

C. 4

D. 3

Answer: Option C

Solution (By JKSSB Mock Tests)

Leading zeros not significant. '2040' – trailing zero after decimal is significant. So digits 2,0,4,0 are significant = 4. Rule: zeros between non-zero and trailing zeros after decimal count.

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Question #1

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A block of mass 5 kg is pushed against a wall with a horizontal force of 50 N. Coefficient of friction 0.4. The block (g=10)

A. Stays at rest

B. Moves sideways

C. Falls down

D. Moves up

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Correct Answer: Option C

Explanation:
Weight = 50 N. Max static friction = μN = 0.4×50 = 20 N, insufficient to hold. So block slides down.

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Question #2

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The process of coating iron with zinc to prevent rusting is called

A. Electroplating

B. Alloying

C. Galvanisation

D. Annealing

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Correct Answer: Option C

Explanation:
Galvanisation: iron/steel coated with zinc to prevent corrosion. Zinc acts as sacrificial anode. Electroplating deposits metal layer using electricity. Alloying mixing metals. Annealing heat treatment.

This question belongs to: Science Physics