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The following question based on light, heat, thermodynamics, wave motion, sound, optics & oscillations topic of general science mcq
(a) ECHO
(b) RADAR
(c) SONAR
(d) None of these
The correct answers to the above question in:
Answer: (c)
Practice light, heat, thermodynamics, wave motion, sound, optics & oscillations (set 10) Online Quiz
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Read more light heat thermodynamics wave sound optics oscillation Based General Science Questions and Answers
Question : 1
Soap bubble looks coloured due to
a) interference
b) dispersion
c) reflection
d) Any one of these
Answer »Answer: (a)
Interference at thin films causes colouring of soap bubble.
Question : 2
Consider two identical iron spheres , one which lie on a thermally insulating plate, while the other hangs from an insulatory thread. Equal amount of heat is supplied to the two spheres
a) Their temperature will be equal
b) Temperature of A will be greater than B
c) Temperature of B will be greater than A
d) Can’t be predicted
Answer »Answer: (c)
The temperature of B will be higher because, due to expansion, the centre of mass of B will come down.
Same heat is supplied but in B, Potential energy is decreased therefore internal energy gain will be more.
Question : 3
A worker was working on the rail track. A boy at a distance holds his ear near the rail track. This boy was able to hear sound of the blow of workman twice. It is because of
a) The speed of sound is greater in air than in steel
b) Part of the sound wave is reflected between the rail tracks
c) The speed of sound is greater in steel than in air
d) His ears are at different distance from the source
Answer »Answer: (c)
Question : 4
Consider the following statements:
- Light of longer wavelength are scattered much more than the light of shorter wavelength.
- The speed of visible light in water is 0.95 times the speed in vacuum.
- Radio waves are produced by rapidly oscillating electrical currents.
- To detect the over speeding vehicles, police use the Doppler effect of reflected short radio waves.
a) 2 and 4
b) 1 and 2
c) 1 and 3
d) 3 and 4
Answer »Answer: (d)
Radio waves are a form of electromagnetic radiation, created whenever a charged object (in normal radio transmission, an electron) accelerates with a frequency that lies in the radio frequency (RF) portion of the electromagnetic spectrum.
Thus statement 3 is correct.
The Doppler’s Effect shows a change in a wave’s frequency received when it is either reflected from a moving object or generated on a moving object. Police radar speed detectors bounce a radio frequency wave off cars and use their internal electronics to determine the speed at which the object is moving by that frequency change.
Therefore, statement 4 is also correct.
Question : 5
Consider the following statements:
- Light has transverse wave nature.
- Light cannot travel in vacuum.
- No particle can ever move at a speed greater than the speed of light in vacuum.
a) 2 and 3
b) 1 and 2
c) 1 and 3
d) 1, 2 and 3
Answer »Answer: (c)
Yes light can travel through vacuum. It is because light waves consists of magnetic field which is perpendicular to electric field which results in creation of potential difference between two points and light wave propagates.
Question : 6
Let the average temperatures in Centigrade (C) and Fahrenheit (F) be $C↖{-}$ and $F↖{-}$ . If $C↖{-}$ and $F↖{-}$ are related to F = $9/2$C + 32, then $F↖{-}$ and $C↖{-}$ have the relation
a) $F↖{-} = C↖{-}$ + 32
b) $F↖{-} = 9/2 C↖{-}$
c) $F↖{-}= 9/5 C↖{-}$ + 32
d) $F↖{-} = 9/5C↖{-}$ - 32
Answer »Answer: (c)
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