The unit of luminous flux is MCQ with Answer and Explanation

The unit of luminous flux is
A. Candela
B. Lumen
C. Watt
D. Lux
Answer: Option B
Solution (By JKSSB Mock Tests)
Lumen (lm).

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Practice More Physics Questions

Question #1
Which of the following is the correct sequence of increasing wavelength?
A. Infrared < Radio < X-rays < Gamma
B. Gamma rays < X-rays < Infrared < Radio
C. X-rays < Gamma < Radio < Infrared
D. Radio < Infrared < X-rays < Gamma

Correct Answer: Option B


Explanation:
EM spectrum: Gamma (0.1 m). Increasing wavelength: Gamma, X-ray, IR, Radio.

This question belongs to: Science Physics
Question #2
A body is thrown vertically upward. At the highest point, its acceleration is
A. Zero
B. g upward
C. g downward
D. Variable

Correct Answer: Option C


Explanation:
At highest point velocity is zero, but acceleration due to gravity is still g (9.8 m/s²) downward. This causes it to fall back. Acceleration constant throughout free fall.

This question belongs to: Science Physics
Question #3
The energy equivalent of 1 amu is approximately
A. 1.6 × 10⁻¹⁹ J
B. 931 MeV
C. 931 eV
D. 3.0 × 10⁸ J

Correct Answer: Option B


Explanation:
1 amu = 1.6605 × 10⁻²⁷ kg, using E=mc² gives about 931.5 MeV. Used in nuclear binding energy calculations. Not eV, but MeV. Very large energy per nucleon.

This question belongs to: Science Physics