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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-7 section-8

Each section contains 100 MCQs on Physics .
61
In a photocell light energy is converted into
Discuss
Answer & Solution
Answer: Option D
Solution:
A photocell converts light energy into electrical energy.
62
A voltaic cell converts chemical energy to
Discuss
Answer & Solution
Answer: Option B
Solution:
A galvanic (voltaic) cell converts the energy released by a spontaneous chemical reaction to electrical energy.
63
The work done by the string of a simple pendulum during one complete oscillation is equal to
Discuss
Answer & Solution
Answer: Option D
Solution:
Work done by the string of the simple pendulum during one complete oscillation is zero. Pressure in the string precisely drops the segment parallel to the string.
64
Conversion of sound energy into electrical energy is done by
Discuss
Answer & Solution
Answer: Option C
Solution:
Conversion of sound energy into electrical energy is done by microphone.
65
If a person moves a trolley for a distance of 10 m with a force of 50 N, then the work done is
Discuss
Answer & Solution
Answer: Option D
Solution:
distance of trolley S = 10m
force F =50N
work done = F. S
=50×10
=500J
66
Necessary element of change in solar energy to electrical energy
Discuss
Answer & Solution
Answer: Option B
Solution:
Necessary element of change in solar energy to electrical energy Silicon.
67
In hydro power station, the motion produced in turbines is due to
Discuss
Answer & Solution
Answer: Option A
Solution:
In hydel power station, the motion produced in turbines is due to flow of water.
68
The SI unit for measuring work and energy is
Discuss
Answer & Solution
Answer: Option A
Solution:
The SI unit for measuring work and energy is Joule.
69
In a rechargeable cell what kind of energy is stored within the cell?
Discuss
Answer & Solution
Answer: Option C
Solution:
Electric energy is converted into chemical energy and stored it as chemical energy within the cells.
70
A bullet is fired from a rifle which recoils after firing. The ratio of kinetic energy of the rifle to that of the bullet is
Discuss
Answer & Solution
Answer: Option A
Solution:
Since, the the mass of the bullet is smaller than the mass of the rifle hence, the velocity of the bullet is more than the rifle recoil velocity. Also, kinetic energy is inversely proportional to the mass. Hence, when a bullet is fired from a rifle and the rifle recoils freely then the kinetic energy of the rifle will be less than that of bullet.