A student measures the length of a pencil as 7.50 cm. The number of significant figures is
A. 2
B. 3
C. 1
D. 4
Answer: Option B
Solution (By JKSSB Mock Tests)
7.50 has three significant figures (7,5,0). Trailing zero after decimal is significant. If it were 7.5 cm, two significant figures. Precision indicated by decimal places.
Explanation:
Michael Faraday built the first electric generator (Faraday disk) in 1831, based on electromagnetic induction. Tesla contributed to AC motor and polyphase system. Edison DC systems. Watt steam engine.
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