The essential difference between AC and DC is MCQ with Answer and Explanation

The essential difference between AC and DC is
A. Resistance
B. Magnitude only
C. Direction of current
D. Voltage level
Answer: Option C
Solution (By JKExamLibrary)
AC changes direction periodically, DC unidirectional.

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 speed of sound in air at 20°C is approximately
A. 360 m/s
B. 300 m/s
C. 330 m/s
D. 343 m/s

Correct Answer: Option D


Explanation:
At 0°C ≈ 331 m/s, increases with temperature. At 20°C ≈ 343 m/s.

This question belongs to: Science Physics
Question #2 Report Error
The part of the eye that controls the amount of light entering is
A. Retina
B. Cornea
C. Iris
D. Lens

Correct Answer: Option C


Explanation:
Iris adjusts pupil size.

This question belongs to: Science Physics
Question #3 Report Error
A lactometer operates on the principle of:
A. Archimedes' Principle
B. Pascal's Law
C. Bernoulli's Theorem
D. Newton's Law of Viscosity

Correct Answer: Option A


Explanation:
A lactometer is a specific type of hydrometer used to test the purity of milk by measuring its relative density. All hydrometers, including lactometers, work on Archimedes' Principle of buoyancy. They float at a depth that depends directly on the density of the liquid; they sink deeper in less dense liquids (like milk heavily diluted with water).

This question belongs to: Science Physics