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The following question based on light, heat, thermodynamics, wave motion, sound, optics & oscillations topic of general science mcq
A piece of copper and a piece of glass are heated to the same temperature. When touched, thereafter, the copper piece appears hotter than the glass piece.
Reason (R) :
The density of copper is more than that of glass.
(a) Both A and R are true but R is not a correct explanation of A
(b) Both A and 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
The correct answers to the above question in:
Answer: (a)
Discuss Form
Read more light heat thermodynamics wave sound optics oscillation Based General Science Questions and Answers
Question : 1
Assertion and Reason are given below.
Assertion (A):
We prefer the white dress in winters.
Reason (R):
White dresses are good reflectors of heat.
Which one among these is the right answer.
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: (d)
Question : 2
Which one of the following is used as an antifreeze for the automobile engines?
a) Ethylene glycol
b) Methanol
c) Ethanol
d) Propyl alcohol
Answer »Answer: (a)
Question : 3
The technique used to transmit audio signals in television broadcast is
a) Pulse code modulation
b) Frequency modulation
c) Amplitude modulation
d) Time dimension multiplication
Answer »Answer: (b)
Question : 4
Decibel unit is used to measure
a) Sound intensity
b) Magnitude of earthquake
c) Light intensity
d) None of the above
Answer »Answer: (a)
Question : 5
Why is sound heard with more intensity through CO2 than through the air ?
a) Density of CO2 is less than that of air
b) Density of CO2 is more than that of air
c) Air is bad conductor of heat
d) CO2 is a compound, but air is a mixture of gases.
Answer »Answer: (b)
Question : 6
Match list I with list II and select the correct answer using the codes given below the lists.
List I | List II |
A. Heat | 1. 0°C |
B. Temperature | 2. Zero Kelvin |
C. Temperature of melting ice | 3. Sum of K.E. + P.E. of the molecules |
D. Absolute zero temperature | 4. Average K.E. of molecules |
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 – 3, B – 4, C – 1, D – 2
Answer »Answer: (d)
Heat is the total K.E. and P.E. of the molecules.
Water freezes at 0°C.
Absolute zero i.e., zero Kelvin temperature.
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