Fuse protects circuit by: MCQ with Answer and Explanation

Question
Fuse protects circuit by:
A. Melting on overcurrent
B. Amplifying signal
C. Storing energy
D. Limiting voltage
Answer: Option A
Solution (By JKExamLibrary)
Fuse wire melts when current exceeds rating (Joule heating I²R), breaking circuit to prevent damage. Sacrificial overcurrent protection. Memory aid: 'Fuse = thermal cutoff; rated current slightly above normal'. Safety device function frequently tested in competitive electricity sections.
This question belongs to: Science Physics
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Question #1
Which of the following has highest specific heat capacity?
A. Copper
B. Water
C. Aluminium
D. Iron
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Correct Answer: Option B

Explanation:
Water has exceptionally high specific heat (4200 J/kg°C) due to hydrogen bonding. Used as coolant. Iron ~450, copper ~385, aluminium ~900. High specific heat moderates climate.
This question belongs to: Science Physics
Question #2
Radioactivity was discovered by
A. Curie
B. Becquerel
C. Rutherford
D. Roentgen
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Correct Answer: Option B

Explanation:
Henri Becquerel discovered natural radioactivity in uranium salts (1896). Curie isolated radium, Rutherford classified rays.
This question belongs to: Science Physics
Question #3
The device used to convert solar energy into electrical energy is
A. Wind turbine
B. Solar heater
C. Solar cell
D. Battery
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Correct Answer: Option C

Explanation:
Photovoltaic cell (solar cell) directly converts sunlight to electricity. Solar heater uses sun to heat water, not electricity. Wind turbine converts wind energy. Battery stores chemical energy.
This question belongs to: Science Physics
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