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The following question based on light, heat, thermodynamics, wave motion, sound, optics & oscillations topic of general science mcq
(a) Visible Light
(b) Ultrasonic Waves
(c) Infra-red Rays
(d) X-Rays
The correct answers to the above question in:
Answer: (d)
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Read more light heat thermodynamics wave sound optics oscillation Based General Science Questions and Answers
Question : 1
The mirror, which is used in searchlights, is
a) Simple mirror
b) Convex mirror
c) Concave mirror
d) None of the above
Answer »Answer: (c)
Question : 2
If the length of second’s pendulum is increased by 2%, how many seconds will it lose per day?
a) 3456 s
b) 3600 s
c) 1728 s
d) 846 s
Answer »Answer: (d)
Question : 3
A radio station broadcast at 30 metre band. The frequency of the carrier wave transmitted by this station is
a) 100 kHz
b) 10 MHz
c) 10 kHz
d) 100 MHz
Answer »Answer: (b)
Question : 4
Ultrasonics are sound waves of frequency
a) Less than 10,000 Hz
b) Equal to 1000 Hz
c) Greater than 20,000 Hz
d) None of the above
Answer »Answer: (c)
Question : 5
When a drop of oil is spread on a water surface, it displays beautiful colours in daylight because of
a) polarization of light
b) dispersion of light
c) reflection of light
d) interference of light
Answer »Answer: (d)
The colours are seen due to interference of light. The colours seen in reflected light are complementary with the colours seen in transmitted light.
Question : 6
Which of the following is not close to a black body?
a) Black holes
b) Black board paint
c) Green leaves
d) Red roses
Answer »Answer: (b)
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