A student measures length as 3.600 cm using vernier calliper of least count 0.001 cm. Number of significant figures is MCQ with Answer and Explanation

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A student measures length as 3.600 cm using vernier calliper of least count 0.001 cm. Number of significant figures is

A. 1

B. 2

C. 4

D. 3

Answer: Option C

Solution (By JKSSB Mock Tests)

3.600 has 4 significant figures (3,6,0,0). Trailing zeros after decimal are significant due to precision.

This question belongs to: Science Physics

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LED working principle:

A. Fluorescence

B. Phosphorescence

C. Electroluminescence

D. Incandescence

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Correct Answer: Option C

Explanation:
LED: electroluminescence - electron-hole recombination in semiconductor emits photons. Incandescence: thermal radiation (bulbs); Fluorescence: UV excitation. Memory tip: 'LED = semiconductor light emission; no filament, efficient'. Modern device principle frequently tested in competitive exams linking physics to technology.

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Question #2

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Correct Answer: Option C

Explanation:
R = ρL/A. New R' = ρ(2L)/(A/2) = 4ρL/A = 4R.

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Correct Answer: Option D

Explanation:
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