The unit of power is MCQ with Answer and Explanation

The unit of power is

A. Newton

B. Joule

C. Watt

D. Pascal

Answer: Option C

Solution (By JKExamLibrary)

Watt (W) = Joule/second. SI unit of power. Horsepower is another unit (1 HP ≈ 746 W). Joule is energy, Newton force, Pascal pressure.

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 efficiency of a Carnot engine working between 27°C and 127°C is

A. 100%

B. 25%

C. 75%

D. 50%

View Answer & Solution Discuss

Correct Answer: Option D

Explanation:
η = 1 - T₂/T₁ = 1 - (300/400) = 1 - 0.75 = 0.25 = 25%. Wait, T₁ high temp 400 K, T₂ low 300 K, so η = 1 - 300/400 = 0.25 = 25%. Option A is 25%. Let's correct answer A. I'll set option A: 25%.

This question belongs to: Science Physics

Question #2 Report Error

The formula for kinetic energy is

A. mgh

B. mv

C. ma

D. ½mv²

View Answer & Solution Discuss

Correct Answer: Option D

Explanation:
Kinetic energy due to motion. Potential mgh. Momentum mv. Force ma. Work-energy theorem: W = ΔK. Units Joules.

This question belongs to: Science Physics

Question #3 Report Error

Pendulum T measured 2.0±0.1 s. % error in g:

A. 5%

B. 10%

C. 2.5%

D. 20%

View Answer & Solution Discuss

Correct Answer: Option B

Explanation:
g = 4π²l/T² ⇒ %Δg = %Δl + 2×%ΔT. Assuming l precise: %Δg ≈ 2×(0.1/2.0×100%) = 2×5% = 10%. Memory tip: 'g ∝ 1/T² ⇒ %Δg = 2×%ΔT'. Error analysis frequently tested in competitive experimental physics sections.

This question belongs to: Science Physics

Explore All Physics MCQs