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The following question based on light, heat, thermodynamics, wave motion, sound, optics & oscillations topic of general science mcq
(a) the temperature of its surface
(b) the nature of its surface
(c) the area of its surface
(d) All of the above
The correct answers to the above question in:
Answer: (d)
Discuss Form
Read more light heat thermodynamics wave sound optics oscillation Based General Science Questions and Answers
Question : 1
The normal temperature of human body is 98.4°F. It’s equivalent temperature (in °C) is
a) 36.89
b) 35.72
c) 40.16
d) 32.36
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. The coefficient of volume expansion at constant pressure | 1. Decrease in pressure |
B. At constant temperature, an increase in volume results in | 2. At all temperature |
C. An ideal gas obeys Boyle’s and Charle’s law | 3. Same for all gases |
D. A real gas behaves as an ideal gas at low pressure | 4. At high temperature |
a) A – 3, B – 1, C – 2, D – 4
b) A – 2, B – 3, C – 4, D – 1
c) A – 2, B – 1, C – 3, D – 4
d) A – 3, B – 4, C – 1, D – 2
Answer »Answer: (a)
(A) → 3 Cv = $1/{273}$ °C same for all gases
(B) → 1 PV = cos A ⇒ P ∝ $1/V$
(C) → 2 Ideal gas obeys gas law at each range of temperature.
(D) → 4 At high temperature, intermolecular forces become zero and so real gas behaves like an ideal gas.
Question : 3
Which of the following statements is/ are false about mode of heat transfer?
- In radiation, heat is transfered from one medium to another without affecting the intervening medium
- Radiation and convection are possible in vaccum while conduction requires material medium.
- Conduction is possible in solids while convection occurs in liquids and gases.
a) II only
b) I only
c) II and III
d) I, II and III
Answer »Answer: (a)
Question : 4
At a given temperature the internal energy of a substance
a) in liquid state is more than that in gaseous state
b) in liquid state is equal to that in gaseous state
c) in liquid state is less than that in gaseous state
d) is equal for the three states of matter
Answer »Answer: (c)
Question : 5
A solid cube and a solid sphere of the same material have equal surface area. Both are at the same temperture 120°C , then
a) the sphere cools down faster than the cube
b) both the cube and the sphere cool down at the same rate
c) the cube cools down faster than the sphere
d) whichever is having more mass will cool down faster
Answer »Answer: (c)
Rate of cooling of a body R = ${Δϴ}/t = {Aɛσ(T^4 - {T_O}^4)}/{mc}$
⇒ $R ∝ A/m ∝ \text"Area"/\text"Volume"[m = ρ×V]$
⇒ For the same surface area. $R ∝ 1/\text"Volume"$
Since Volume of cube < Volume of a sphere
⇒ $R_{cube} > R_{Sphere}$
i.e., the cube cools down at a faster rate.
Question : 6
The power of a lens is measured in
a) Lumen
b) Aeon
c) Dioptre
d) Candela
Answer »Answer: (c)
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