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The following question based on light, heat, thermodynamics, wave motion, sound, optics & oscillations topic of general science mcq
(a) 290
(b) 300
(c) 280
(d) 310
The correct answers to the above question in:
Answer: (d)
Practice light, heat, thermodynamics, wave motion, sound, optics & oscillations (set 15) Online Quiz
Discuss Form
Read more light heat thermodynamics wave sound optics oscillation Based General Science Questions and Answers
Question : 1
Assertion (A) :
A jet aircraft moving at Mach Number equal to 1 travels faster at an altitude of 15 km than while moving at Mach Number equal to 1 near the sea level.
Reason (R) :
The velocity of sound depends on the temperature of the surrounding medium.
a) Both A and R are true but R is not a correct explanation of A
b) Both A are R are true and R is the correct explanation of A
c) A is true but R is false
d) A is false but R is true
Answer »Answer: (d)
Question : 2
In scattering of light phenomenon, light falls on tiny particles absorbed by these tiny particles. Then these particles re-emit light in all directions.
- Intensity of scattered light, $I ∝ 1/λ^4$
- Greenish-blue appearance of sea water is due to scattering of light
- In a clear atmosphere of the earth, red colour scatters more than blue colour.
a) 1 and 3
b) 1 and 2
c) 2 and 3
d) 1, 2 and 3
Answer »Answer: (d)
The wavelength of the red colour is more than the blue colour. According to Reybergh's scattering formula scattering ∝ $1/4$
Thus, the light of short waves is scattered about ten times as the longer waves of red light.
Question : 3
The technique used to transmit auto signals in television broadcasts is
a) Pulse Code Modulation
b) Frequency Modulation
c) Amplitude Modulation
d) Time Division Multiplexing
Answer »Answer: (b)
Question : 4
When a CD (compact disc used in audio and video systems) is seen in sunlight, rainbow like colours are seen. This can be explained on the basis of the phenomenon of
a) diffraction and transmission
b) reflection and diffraction
c) reflection and transmission
d) refraction, diffraction and transmission
Answer »Answer: (d)
The reason CDs reflect rainbow colours is because they have a clear plastic coating on top of a mirrored surface. Light refracts (bends) when it moves from one medium (such as air) to another with a different optical density (such as the clear plastic surface of a CD).
Different wavelengths of light (every colour has a different wavelength) travel at different speeds so that the full spectrum appears when white light passes from the air through the plastic surface of a CD, separated light rays which are then reflected back to us by the mirrored centre surface of a CD.
Here the diffraction and transmission also take place because diffraction of light rays occurs when it strikes the surface of CD and transmission is obvious when light enters from one medium to another.
The thickness of the different optical media, angle of source light, and brightness of source light all affect which rainbow patterns are visible on a CD.
Question : 5
5g ice at 0ºC is mixed with 5g of steam at 100ºC . What is the final temperature?
a) 80ºC
b) 50ºC
c) 100ºC
d) 150ºC
Answer »Answer: (c)
Heat required by ice to raise its temperature to 100°C,
$Q_1 = m_1L_1 + m_1c_ 1Δϴ_1$ = 5 × 80 + 5 × 1 × 100 = 400 + 500 = 900 cal.
Heat given by steam when condensed,
$Q_2 = m_2L_2$ = 5 × 536 = 2680 cal as $Q_2 > Q_1$.
This means that whole steam is not even condensed.
Hence temperature of mixture will remain at 100°C.
Question : 6
Which of the following is carried by the waves from one place to another ?
a) Wavelength
b) Mass
c) Velocity
d) Energy
Answer »Answer: (d)
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