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The following question based on light, heat, thermodynamics, wave motion, sound, optics & oscillations topic of general science mcq
- frequency
- intensity
- quality
(a) 2 and 3 only
(b) 1 and only
(c) 3 only
(d) 2 only
The correct answers to the above question in:
Answer: (c)
Discuss Form
Read more light heat thermodynamics wave sound optics oscillation Based General Science Questions and Answers
Question : 1
Which of the following processes result in cooling ?
- Evaporation of liquid
- Compression of gas
- Shaking a liquid in a vessel
- Adiabatic expansion of a gas
a) 2 and 3
b) 1 and 4
c) 1 and 3
d) 3 and 4
Answer »Answer: (b)
- The process of a liquid changing into its vapour below its boiling point is called evaporation. In this process remaining water after evaporation loses heat and gets cooled.
- If a gas is compressed, work is done on it which results in heating of the system or an increase in temperature.
- On shaking a liquid in a vessel, the kinetic energy of liquid molecules increases and hence, the temperature of the system increases.
-
In adiabatic process ΔQ = 0
From the first law of thermodynamics,
ΔQ = ΔU + ΔW
We have ΔU + ΔW = 0
If the gas expands adiabatically (DW→positive), DU will be negative, so internal energy and hence, the temperature of the system will decrease. Thus, the gas is cooled.
Thus option (b) is correct.
Question : 2
The splitting of white light into seven colours on passing through a glass prism is due to
a) interference
b) refraction
c) reflection
d) diffraction
Answer »Answer: (b)
Disperssion arises because of basic phenomenon refraction.
Question : 3
Match List - I with List - II:
List I | List II |
A. high pitch | 1. Faint sound |
B. low pitch | 2. Loud sound |
C. small amplitude | 3. High frequency |
D. large amplitude | 4. Low frequency |
a) A – 4, B – 1, C – 2, D – 3
b) A – 2, B – 1, C – 4, D – 3
c) A – 2, B – 3, C – 4, D – 1
d) A – 3, B – 4, C – 1, D – 2
Answer »Answer: (b)
The faster the vibration of source, the higher is the frequency and the higher is the pitch.
Question : 4
Food in the pressure cooker is cooked faster, as
a) more steam is available at 100°C
b) the boiling point increases due to an increase in pressure
c) the boiling point decreases due to an increase in pressure
d) more pressure is available at 100°C
Answer »Answer: (b)
Question : 5
When ice melts, then
a) Volume decreases
b) Mass increases
c) Volume increases
d) Mass decreases
Answer »Answer: (a)
Question : 6
Consider the following statements:
- Principle of superposition can be used for any physical quantity.
- Principle of superposition can be used only when amplitude of quantity is small.
- It is not possible to have interference between the waves produced by two independent sources of same frequency.
- For interference of two waves the phase difference between the waves remain constant.
a) 1, 2 and 3
b) 1 and 2
c) 3 and 4
d) 2, 3 and 4
Answer »Answer: (a)
Principle of superposition is applicable in wave motion.
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