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. Conduction
B. Latent Heat Transfer
C. Convection
D. Radiation
Answer: Option D
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
The human ear can hear sound in frequency range
A. 0-20 Hz
B. 20 kHz - 200 kHz
C. Above 200 kHz
D. 20 Hz - 20 kHz

Correct Answer: Option D


Explanation:
Audible range: 20 Hz to 20,000 Hz (20 kHz). Below 20 Hz infrasound, above ultrasound. This range decreases with age. Dogs can hear higher frequencies (ultrasonic whistles).

This question belongs to: Science Physics
Question #2
Pressure at depth h in fluid: P = P₀ + ρgh. If depth doubles, pressure increase is:
A. Same
B. Double
C. Four times
D. Half

Correct Answer: Option B


Explanation:
Gauge pressure (excluding atmospheric) P_gauge = ρgh ∝ h. Doubling depth doubles gauge pressure. Total pressure P = P₀ + ρgh increases but not exactly double due to P₀ term. Question asks about pressure increase (ρgh part). Memory tip: 'Hydrostatic pressure ∝ depth'. Fundamental fluid statics concept frequently tested in competitive exams.

This question belongs to: Science Physics
Question #3
The wave property that determines pitch is
A. Speed
B. Frequency
C. Amplitude
D. Wavelength

Correct Answer: Option B


Explanation:
Pitch related to frequency.

This question belongs to: Science Physics