The number of significant figures in 0.00450 is MCQ with Answer and Explanation

The number of significant figures in 0.00450 is
A. 5
B. 3
C. 4
D. 2
Answer: Option B
Solution (By JKSSB Mock Tests)
Leading zeros not significant. '450' has three digits, but the trailing zero after decimal is significant (4,5,0). So 3 significant figures. 0.00450 is 3 SF.

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Practice More Physics Questions

Question #1
A force of 20 N acts on a body of mass 4 kg for 5 s. Change in momentum is
A. 4 kg m/s
B. 100 kg m/s
C. 80 kg m/s
D. 20 kg m/s

Correct Answer: Option B


Explanation:
Impulse = F×t = 20×5 = 100 N s = change in momentum.

This question belongs to: Science Physics
Question #2
Linear expansion coefficient α = 2×10⁻⁵/°C. Length increase for 1 m rod heated 50°C:
A. 10 mm
B. 1 mm
C. 0.01 mm
D. 0.1 mm

Correct Answer: Option B


Explanation:
ΔL = L₀αΔT = 1×2×10⁻⁵×50 = 100×10⁻⁵ = 10⁻³ m = 1 mm. Direct expansion formula application. Memory tip: 'ΔL = LαΔT; convert result to required units'. Tests thermal expansion calculation with unit conversion, frequently appearing in competitive exams.

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An echo is an example of
A. Refraction of sound
B. Reflection of sound
C. Diffraction of sound
D. Interference of sound

Correct Answer: Option B


Explanation:
Echo is reflected sound.

This question belongs to: Science Physics