The phenomenon by which heat is transferred through empty space without the need for a material medium is known as: MCQ with Answer and Explanation

The phenomenon by which heat is transferred through empty space without the need for a material medium is known as:
A. Convection
B. Latent Heat Transfer
C. Radiation
D. Conduction
Answer: Option C
Solution (By JKSSB Mock Tests)
Thermal radiation is the transfer of heat via electromagnetic waves (primarily infrared). Unlike conduction (which requires physical contact) or convection (which requires fluid movement), radiation can travel through a vacuum. This is how the heat from the Sun reaches the Earth through the vacuum of space.

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Practice More Physics Questions

Question #1
Who gave the law of floatation?
A. Bernoulli
B. Archimedes
C. Pascal
D. Newton

Correct Answer: Option B


Explanation:
Archimedes' principle: buoyant force = weight of displaced fluid. Law of floatation: floating body displaces fluid equal to its own weight. Archimedes discovered it. Pascal gave pressure law.

This question belongs to: Science Physics
Question #2
The instrument used to record seismic waves is
A. Barometer
B. Hygrometer
C. Anemometer
D. Seismograph

Correct Answer: Option D


Explanation:
Seismograph records earth tremors, detects earthquakes. Barometer atmospheric pressure. Hygrometer humidity. Anemometer wind speed. Seismograph uses inertia of a suspended mass.

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Question #3
A 1000 W heater is used for 2 hours. Energy consumed in kWh is
A. 0.5 kWh
B. 2 kWh
C. 1000 kWh
D. 2000 kWh

Correct Answer: Option B


Explanation:
Power = 1 kW (1000 W). Time = 2 h. Energy = Power × time = 1 × 2 = 2 kWh. 1 kWh = 3.6 × 10⁶ J, but here answer in kWh. Commercial unit.

This question belongs to: Science Physics