The frequency of AC mains in India is MCQ with Answer and Explanation

Question

Share Report Error

The frequency of AC mains in India is

A. 0 Hz

B. 50 Hz

C. 60 Hz

D. 100 Hz

Answer: Option B

Solution (By JKExamLibrary)

Indian grid frequency 50 Hz, voltage 230 V. In USA 60 Hz. Most Asian/European countries 50 Hz. Transformers designed accordingly.

This question belongs to: Science Physics

Request complete Subject PDF

Discuss this Question (0)

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

Practice More Physics Questions

Question #1

The energy dissipated as heat in a resistor is given by

A. I²Rt

B. VIt

C. All of the above

D. V²t/R

View Answer & Solution Discuss

Get Complete Subject PDF for Science

Correct Answer: Option C

Explanation:
All expressions equivalent (Joule's law).

This question belongs to: Science Physics

Question #2

Ultrasonic waves have frequency

A. 20 Hz to 20 kHz

B. Less than 20 Hz

C. Greater than 20 kHz

D. Greater than 20 MHz

View Answer & Solution Discuss

Get Complete Subject PDF for Science

Correct Answer: Option C

Explanation:
Above 20 kHz is ultrasound.

This question belongs to: Science Physics

Question #3

An echo returned in 0.5 s. If speed of sound is 340 m/s, the distance of reflecting surface is

A. 680 m

B. 340 m

C. 170 m

D. 85 m

View Answer & Solution Discuss

Get Complete Subject PDF for Science

Correct Answer: Option D

Explanation:
d = (v×t)/2 = (340×0.5)/2 = 170/2 = 85 m. Minimum distance for echo perception is about 17 m. Remember divide by 2 for one-way distance.

This question belongs to: Science Physics

Explore All Physics MCQs