A typical household refrigerator works by forcing a refrigerant fluid through a cycle of: MCQ with Answer and Explanation

A typical household refrigerator works by forcing a refrigerant fluid through a cycle of:
A. Nuclear fission and fusion
B. Ionization and recombination
C. Sublimation and deposition
D. Evaporation and condensation
Answer: Option D
Solution (By JKSSB Mock Tests)
A refrigerator is a heat pump operating in reverse. A compressor squeezes the refrigerant gas, raising its temperature. As it passes through coils on the back (condenser), it releases heat and condenses into a liquid. This liquid expands through a valve, cooling rapidly, and flows into the evaporator coils inside the fridge, where it absorbs heat from the food and evaporates back into a gas.

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Practice More Physics Questions

Question #1
The phenomenon of resonance in sound is used in:
A. Both (a) and (b)
B. Neither
C. Tuning forks
D. Musical instruments

Correct Answer: Option A


Explanation:
Resonance (amplification at natural frequency) is exploited in musical instruments (e.g., guitar body resonates with string frequencies) and tuning forks (designed to vibrate at precise frequency for calibration). Memory tip: 'Resonance applications: musical instruments (amplify sound), tuning forks (frequency standard), bridges (avoid resonance to prevent collapse)'. This application question tests wave phenomena uses, frequently appearing in competitive exams. Always link physical principles to practical applications; competitive exams emphasize real-world relevance of physics concepts, including both beneficial and hazardous aspects of resonance.

This question belongs to: Science Physics
Question #2
A sound wave has wavelength 1.7 m and speed 340 m/s. Its frequency is
A. 340 Hz
B. 170 Hz
C. 578 Hz
D. 200 Hz

Correct Answer: Option D


Explanation:
f = v/λ = 340/1.7 = 200 Hz.

This question belongs to: Science Physics
Question #3
A force F gives an acceleration a to mass m. If mass doubled and force halved, acceleration becomes
A. a/2
B. a
C. 2a
D. a/4

Correct Answer: Option D


Explanation:
a' = (F/2)/(2m) = F/(4m) = a/4.

This question belongs to: Science Physics