The device that protects electrical circuits from overload is MCQ with Answer and Explanation

The device that protects electrical circuits from overload is
A. Capacitor
B. Switch
C. Resistor
D. Fuse
Answer: Option D
Solution (By JKSSB Mock Tests)
Fuse melts and breaks circuit when current exceeds rating. MCB (Miniature Circuit Breaker) does same but resettable. Switch only turns on/off. Resistor limits current but doesn't break.

Discuss this Question (0)

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

Practice More Physics Questions

Question #1
A nuclear reactor uses control rods made of
A. Heavy water
B. Graphite
C. Cadmium
D. Uranium

Correct Answer: Option C


Explanation:
Cadmium or boron absorb neutrons to control chain reaction.

This question belongs to: Science Physics
Question #2
Which of the following is a derived unit in SI system?
A. Newton
B. Ampere
C. Mole
D. Kelvin

Correct Answer: Option A


Explanation:
Newton is a derived unit representing force, defined as kg·m/s². Kelvin (temperature), Ampere (current), and Mole (amount of substance) are fundamental SI units. Derived units are combinations of fundamental units through physical relationships. Newton comes from Newton's second law: F = ma. Memory aid: Remember the seven fundamental SI units: meter, kilogram, second, ampere, kelvin, mole, candela. All others like newton, joule, watt are derived. This distinction is essential for unit conversion questions in competitive exams.

This question belongs to: Science Physics
Question #3
A wave of frequency 500 Hz has speed 350 m/s. Wavelength is
A. 175 m
B. 70 m
C. 1.43 m
D. 0.7 m

Correct Answer: Option D


Explanation:
λ = v/f = 350/500 = 0.7 m.

This question belongs to: Science Physics