set 14 MCQ Questions & Answers Detailed Explanation
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The following question based on light, heat, thermodynamics, wave motion, sound, optics & oscillations topic of general science mcq
(a) the reflected sound wave at fixed end interferes with the incident wave
(b) the sound wave undergoes diffraction behind obstacles
(c) the longitudinal movement of air molecules produce pressure fluctuations
(d) the speed of the sound wave changes as it travels through a medium
The correct answers to the above question in:
Answer: (c)
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
Wireless communication is reflected back to the Earth’s surface by the
a) Ionosphere
b) Stratosphere
c) Troposphere
d) Exosphere
Answer »Answer: (a)
Question : 2
Match List I with List II and select the correct answer using the codes given below the lists
List I | List II |
A. Isothermal process | 1. Volume of the system remains constant |
B. Adiabatic process | 2. Pressure of the system remains constant |
C. Isobaric process | 3. Temperature of the system remains constant |
D. Isochoric process | 4. No heat transfer takes place between the system and the surrounding |
a) A – 3, B – 4, C – 2, D – 1
b) A – 2, B – 3, C – 4, D – 1
c) A – 2, B – 1, C – 4, D – 3
d) A – 4, B – 3, C – 1, D – 2
Answer »Answer: (a)
Question : 3
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)
Question : 4
The frequency of a wave travelling at a speed of 500 ms–1 is 25Hz. Its time period is
a) 25 s
b) 20 s
c) 0.05 s
d) 0.04 s
Answer »Answer: (d)
Question : 5
Consider the following statements:
- Steam at 100°C and boiling water at 100°C contain same amount of heat.
- Latent heat of fusion of ice is equal to the latent heat of vaporization of water.
- In an air-conditioner, heat is extracted from the room air at the evaporator coils and is rejected out at the condenser coils.
a) 2 and 3
b) 1 and 2
c) Only 2
d) Only 3
Answer »Answer: (d)
Question : 6
Consider the following phenomena.
- Size of the Sun at dusk
- Colour of the Sun at dawn
- Moon being visible at dawn
- Twinkle of stars in the sky
- Polestar being visible in the sky
a) 1, 2 and 4
b) 3, 4 and 5
c) 1, 2 and 3
d) 2, 3 and 5
Answer »Answer: (a)
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