A 40 W tube light consumes _____ energy in 8 hours. MCQ with Answer and Explanation
Question
Report Error
Discuss this Question (0)
Practice More Physics Questions
Question #1
Report Error
The number of significant figures in 0.0034060 is
Correct Answer: Option C
Explanation:
Leading zeros (before first non-zero digit) are not significant. So 0.0034060: the first non-zero is 3, then 4,0,6 are significant, and the trailing zero after decimal is significant. Thus significant digits are 3,4,0,6,0 — 5 digits. Note: The last zero indicates precision. Answer is 5.
Leading zeros (before first non-zero digit) are not significant. So 0.0034060: the first non-zero is 3, then 4,0,6 are significant, and the trailing zero after decimal is significant. Thus significant digits are 3,4,0,6,0 — 5 digits. Note: The last zero indicates precision. Answer is 5.
Question #2
Report Error
A convex lens is placed in water. Its focal length
Question #3
Report Error
Interference demonstrates light's:
Correct Answer: Option B
Explanation:
Interference (constructive/destructive superposition) is wave phenomenon. Young's double-slit confirmed light's wave nature. Particle nature shown by photoelectric effect. Memory aid: 'Interference/diffraction ⇒ wave; photoelectric ⇒ particle'. Wave-particle duality frequently tested in competitive exams.
Interference (constructive/destructive superposition) is wave phenomenon. Young's double-slit confirmed light's wave nature. Particle nature shown by photoelectric effect. Memory aid: 'Interference/diffraction ⇒ wave; photoelectric ⇒ particle'. Wave-particle duality frequently tested in competitive exams.
No comments yet. Be the first to start the discussion!