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The following question based on light, heat, thermodynamics, wave motion, sound, optics & oscillations topic of general science mcq
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
The correct answers to the above question in:
Answer: (b)
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
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 : 2
Which of the following atmospheric layers is responsible for the deflection of radio waves?
a) Mesosphere
b) Stratosphere
c) Troposphere
d) Ionosphere
Answer »Answer: (d)
Question : 3
Placement of another identical prism in an inverted position with respect to the first and allowing the colours of spectrum to pass through it will
a) keep the spectrum as before
b) change the spectrum into white light
c) change the spectrum into a black band
d) split into more colours
Answer »Answer: (b)
Placement of another identical prism in an inverted position with respect to the first and allowing the colours of spectrum to pass through it will change the spectrum into white light.
Question : 4
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 : 5
If a car is moving towards you with its horn sounding, you hear a higher pitch than you would hear if the car were at rest. This is because:
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
Answer »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.
Question : 6
The marching soldiers break steps while crossing a bridge because of
a) echo
b) damped oscillations
c) resonance
d) reverberation
Answer »Answer: (c)
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