The principle of a microwave oven is MCQ with Answer and Explanation

The principle of a microwave oven is
A. Infrared radiation
B. Dielectric heating
C. Convection heating
D. Induction heating
Answer: Option B
Solution (By JKSSB Mock Tests)
Microwaves (2.45 GHz) are absorbed by water, fat, sugar molecules, causing them to rotate and generate heat through dielectric heating. Not induction (metal). Not conventional convection.

Discuss this Question (0)

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

Practice More Physics Questions

Question #1
A train 150 m long running at 60 km/h crosses a man walking at 6 km/h in opposite direction. Time taken is
A. 15 s
B. 6 s
C. 12 s
D. 9 s

Correct Answer: Option D


Explanation:
Relative speed = 60+6 = 66 km/h = 66×5/18 = 55/3 m/s. Time = distance / relative speed = 150 / (55/3) = 450/55 = 8.18 s ≈ 9 s. Actually 450/55=8.18, nearest 9 s. Option B.

This question belongs to: Science Physics
Question #2
Which component in an electrical circuit is specifically designed to melt and break the circuit in the event of an overload?
A. Fuse
B. Capacitor
C. Switch
D. Resistor

Correct Answer: Option A


Explanation:
A fuse is an electrical safety device consisting of a wire made of an alloy with a low melting point. If the current exceeds a safe limit (due to a short circuit or overload), the Joules heating (I²Rt) causes the wire to melt instantly, breaking the circuit and preventing fire or damage to appliances.

This question belongs to: Science Physics
Question #3
The image formed on retina is
A. Virtual and erect
B. Real and erect
C. Real and inverted
D. Virtual and inverted

Correct Answer: Option C


Explanation:
Real inverted image, brain interprets as erect.

This question belongs to: Science Physics