The SI unit of luminous flux is MCQ with Answer and Explanation

Question Report Error

The SI unit of luminous flux is

A. Lux

B. Candela

C. Lumen

D. Watt

Answer: Option C

Solution (By JKExamLibrary)

Lumen (lm) = cd·sr. Candela is luminous intensity. Lux is illuminance (lm/m²). These are photometric units, important in lighting.

This question belongs to: Science Physics

Discuss this Question (0)

No comments yet. Be the first to start the discussion!

Practice More Physics Questions

Question #1 Report Error

The angle of incidence for a light ray is 30°. According to laws of reflection, angle of reflection is

A. 15°

B. 90°

C. 60°

D. 30°

View Answer & Solution Discuss

Correct Answer: Option D

Explanation:
Law of reflection: angle of incidence = angle of reflection, both measured from normal. So 30°. If angle with mirror is given, convert to normal. Always equal for smooth surfaces.

This question belongs to: Science Physics

Question #2 Report Error

The unit of inductance is

A. Ohm

B. Henry

C. Coulomb

D. Farad

View Answer & Solution Discuss

Correct Answer: Option B

Explanation:
Henry (H) = V·s/A = Ω·s. Self-inductance unit. Capacitance unit farad. Ohm resistance. Coulomb charge.

This question belongs to: Science Physics

Question #3 Report Error

A body of mass 2 kg moves with velocity 3 m/s. It is subjected to a force of 4 N in direction of motion for 2 s. Final velocity is

A. 6 m/s

B. 7 m/s

C. 8 m/s

D. 5 m/s

View Answer & Solution Discuss

Correct Answer: Option B

Explanation:
a = F/m = 4/2 = 2 m/s². v = u + at = 3 + 2×2 = 7 m/s. Impulse = Δp = 8 N s, initial momentum 6, final 14 => v=7 m/s.

This question belongs to: Science Physics

Explore All Physics MCQs