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Practice MCQ Questions and answers on Physics-GK

Learn and practice General Knowledge questions and answers on Physics with very easy and understandable explanations. GK questions are very helpful different type of competitive exams. Page-10 section-1

Each section contains 100 MCQs on Physics .
91
The fuse in an electric circuit is connected in
Discuss
Answer & Solution
Answer: Option D
Solution:
Fuses are always connected in series with the components to be protected from overcurrent, so that when the fuse blows (opens) it will open the entire circuit and stop current through the components.
92
Working of safety fuses depends upon
1. magnetic effect of the current
2. chemical effect of the current
3. magnitude of the current
4. heating effect of the current
Select the correct answer using the code given below.
Discuss
Answer & Solution
Answer: Option C
Solution:
Working of safety fuses depends upon magnitude of the current and heating effect of the current.
93
During thunderstorm you are travelling in a car. To protect yourself from the lightning you will have to
Discuss
Answer & Solution
Answer: Option A
Solution:
During thunderstorm you are travelling in a car. To protect yourself from the lightning you will have to remain in the car.
94
The unit of electrical power is
Discuss
Answer & Solution
Answer: Option B
Solution:
The unit of electrical power is Watt.
95
Safety fuse wire used in domestic electrical appliances is made of metal of low
Discuss
Answer & Solution
Answer: Option B
Solution:
For safety, the fuse wire used in the mains for household supply of electricity must be made of metal having low melting point.
96
The best conductor of electricity among the following is :
Discuss
Answer & Solution
Answer: Option D
Solution:
Silver is the best conductor of electricity.
97
Kilowatt-hour is the unit of :
Discuss
Answer & Solution
Answer: Option A
Solution:
Kilowatt-hour is the unit of energy.
98
Copper wires are generally used for electrical power transmission instead of iron wire because :
Discuss
Answer & Solution
Answer: Option C
Solution:
Copper is generally preferred for electrical power transmission instead of iron because of its high electrical conductivity and low resistivity.
99
The earth-wire of a cable is connected to
Discuss
Answer & Solution
Answer: Option B
Solution:
The earth-wire of a cable is connected to the fuse of the appliance.
100
Lightning is caused due to
Discuss
Answer & Solution
Answer: Option B
Solution:
Lightning is an electrical discharge caused by imbalances between storm clouds and the ground, or within the clouds themselves. Most lightning occurs within the clouds.