The process of transfer of heat in fluids by actual movement of particles is called MCQ with Answer and Explanation

The process of transfer of heat in fluids by actual movement of particles is called
A. Evaporation
B. Convection
C. Conduction
D. Radiation
Answer: Option B
Solution (By JKSSB Mock Tests)
Convection requires medium, movement of hot and cold masses. Land/sea breeze, trade winds, heating water. Conduction vibration transfer without particle movement.

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Practice More Physics Questions

Question #1
SONAR uses waves of frequency:
A. 20 Hz - 20 kHz
B. Any frequency
C. < 20 Hz
D. > 20 kHz

Correct Answer: Option D


Explanation:
SONAR uses ultrasonic waves (>20 kHz) for better directionality, resolution, and reduced absorption in water. Audible sound (20Hz-20kHz) diffracts more; infrasonic (

This question belongs to: Science Physics
Question #2
Which of the following statements is true regarding uniform circular motion?
A. Acceleration is zero
B. Kinetic energy changes continuously
C. Velocity is constant
D. Speed is constant

Correct Answer: Option D


Explanation:
In uniform circular motion, speed remains constant but direction changes, so velocity (vector) changes. There is centripetal acceleration towards centre, so acceleration is not zero. Kinetic energy = ½mv², depends on speed, so remains constant. Thus, only speed is constant.

This question belongs to: Science Physics
Question #3
The frequency of ultrasonic wave is
A. 20 Hz - 20 kHz
B. < 20 Hz
C. > 20 MHz
D. > 20 kHz

Correct Answer: Option D


Explanation:
Above 20 kHz.

This question belongs to: Science Physics