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The following question based on light, heat, thermodynamics, wave motion, sound, optics & oscillations topic of general science mcq
(a) you receive successive crests more frequently even though the wave itself is unchanged
(b) the waves travel faster
(c) successive crests produced by the horn are closer to each other
(d) the motion of the car raises the frequency of the horn
The correct answers to the above question in:
Answer: (a)
When the car is at rest, the observer receives its original frequency $‘v’$.
But when the car is moving towards the stationary observer then the apparent frequency of sound is
$v' = v (v/{v-v_s})$
where vs is the velocity of the source. Hence, the observer receives successive crests more frequently even though the wave itself is unchanged.
Practice light, heat, thermodynamics, wave motion, sound, optics & oscillations (set 14) Online Quiz
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Read more light heat thermodynamics wave sound optics oscillation Based General Science Questions and Answers
Question : 1
Consider the following statements : If the same note is played on a flute and a sitar, one can still distinguish between them because they differ in
- frequency
- intensity
- quality
a) 3 only
b) 1 only
c) 2 and 3
d) 2 only
Answer »Answer: (a)
The difference in music from both the instruments is due to quality difference.
Question : 2
Assertion (A):
The boiling point of water decreases as the altitude increases.
Reason (R):
The atmospheric pressure increases with altitude.
Code
a) Both (A) and (R) are true, but (R) is not the correct explanation of (A)
b) (A) is true, but (R) is false
c) Both (A) and (R) are true and (R) is the correct explanation of (A)
d) (A) is false, but (R) is true
Answer »Answer: (b)
Question : 3
The acronym for LASER is
a) Low Amplitude Short Energy Radiation
b) Light Amplification by Stimulated Emission of Radiation
c) Low Amplitude Stimulated Emission of Radiation
d) Light Amplification by Short Energy Radiation
Answer »Answer: (b)
Question : 4
The marching soldiers break steps while crossing a bridge because of
a) echo
b) damped oscillations
c) resonance
d) reverberation
Answer »Answer: (c)
Question : 5
Consider the following statements :
- 1 gram of water at 100°C and 1 gram of steam at 100°C contain same amount of heat.
- 1 m3 of dry air is heavier than 1 m3 of humid air.
- Density of a substance in C.G.S. system is numerically equal to its specific gravity.
a) 1 and 3
b) 3 only
c) 1 only
d) 2 and 3
Answer »Answer: (b)
(1) 1 gram of steam at 100°C contains greater amount of heat in comparison to 1 gram of water at 100°C. Thus, statement (1) is incorrect.
(2) 1 m3 of humid air is heavier than 1m3 of dry air. Thus, statement (2) is incorrect.
(3) Density of a substance in C.G.S. system is numerically equal to its specific gravity. Thus, statement (3) is correct.
Question : 6
On a specific day and time, the temperature was 48ºC in Churu and 24ºC in Shimla. Two metallic cups identical in all respects contained water at 95ºC in Churu and 71ºC in Shimla. Which one of these two cups reached room temperature first?
a) Cup in Shimla
b) Both cups reached room temperature at the same time
c) Cup in Churu
d) Data are not enough to find out result
Answer »Answer: (b)
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