Matter UPSC Questions

Physics

Matter MCQ Questions


13.
Equal volumes of all gases under similar conditions of temperature and pressure contain equal numbers of molecules. This statement was made by
A.
Berzilius
B.
Avogadro
C.
Gay- lussae
D.
John Dalton
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ANSWER :
B. Avogadro
14.
Brominated flame retardants are used in many household products like mattresses and upholstery. Why is there some concern about their use?
1. They are highly resistant to degradation in the environment.
2. They are able to accumulate in humans and animals.
Select the correct answer using the code given below.
UPSC - 2014
A.
1 only
B.
2 only
C.
Both 1 and 2
D.
Neither 1 nor 2
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ANSWER :
C. Both 1 and 2
15.
Rate of dissusion of a gas is
A.
Directly proportional to its density
B.
Directly proportional to its molecular mass
C.
Inversely proportional to the square root of its density
D.
Inversely proportional to the square root of its molecular mass
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ANSWER :
D. Inversely proportional to the square root of its molecular mass
16.
Which of the following phenomena would increase on raising the temperature?
A.
Diffusion, evaporation, compression of gases
B.
Evaporation, compression of gases, solubility
C.
Evaporation, diffusion, expansion of gases
D.
Evaporation, solubility, diffusion, compression of gases
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ANSWER :
C. Evaporation, diffusion, expansion of gases
17.
In which of the following conditions, the distance between the molecules of hydrogen gas would increase?
(i) Increasing pressure on hydrogen contained in a closed container
(ii) Some hydrogen gas leaking out of the container
(iii) Increasing the volume of the container of hydrogen gas
(iv) Adding more hydrogen gas to the container without increasing the volume of the container
A.
(i) and (iv) only
B.
(i) and (ii) only
C.
(ii) and (iv) only
D.
(ii) and (iii) only
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ANSWER :
D. (ii) and (iii) only
18.
During summer, water kept in an earthen pot becomes cool because of the phenomenon of
A.
Diffusion
B.
Transpiration
C.
Osmosis
D.
Evaporation
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ANSWER :
D. Evaporation