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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-4 section-1

Each section contains 100 MCQs on Physics .
31
Sound of frequency below 20 Hz is called
Discuss
Answer & Solution
Answer: Option B
Solution:
Sound of frequency below 20 Hz is called Infrasonic.
32
On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because:
Discuss
Answer & Solution
Answer: Option C
Solution:
On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because cohesion of mercury is greater than its adhesion with glass.
33
Suitable impurities are added to a semiconductor depending on its use. This is done in order to
Discuss
Answer & Solution
Answer: Option C
Solution:
Suitable impurities are added to a semiconductor depending on its use. This is done in order to increase its electrical conductivity.
34
Stars twinkle because
Discuss
Answer & Solution
Answer: Option C
Solution:
Stars twinkle because the refractive index of the different layers of the earth's atmosphere changes continuously.
35
It takes much longer to cook food in the hills than in the plains, because
Discuss
Answer & Solution
Answer: Option A
Solution:
It takes much longer to cook food in the hills than in the plains, because in the hills the atmospheric pressure is lower than that in the plains and therefore water boils at a temperature lower than 100oC causing an increase in cooking time.
36
Moment of inertia is:
Discuss
Answer & Solution
Answer: Option D
Solution:
Moment of inertia is tensor.
37
Of the following natural phenomena, tell which one known in Sanskrit as 'deer's thirst'?
Discuss
Answer & Solution
Answer: Option D
Solution:
Of the following natural phenomena, mirage is known in Sanskrit as 'deer's thirst'?
38
Inside an aeroplane, flying at a high altitude,
Discuss
Answer & Solution
Answer: Option B
Solution:
The air pressure in an aircraft (cabin pressure) is kept higher than the atmospheric pressure at high altitudes to avoid discomfort to passengers due to low outside air pressure. This pressure is called cabin pressurization. Hence the normal atmospheric pressure is maintained by the use of air pumps.
39
Sound travels with a different speed in media. In what order does the velocity of sound increase in these media?
Discuss
Answer & Solution
Answer: Option C
Solution:
Increasing order of velocity of sound in the following media is as follows : Air, water and iron.
40
One thousand microns is equal to
Discuss
Answer & Solution
Answer: Option A
Solution:
One thousand microns is equal to 10-3m.