Physical and Chemical Changes NDA Questions

NDA Chemistry

Physical and Chemical Changes MCQ Questions


7.
The rate of evaporation depends upon the surface area exposed to the atmosphere, _____
A.
Temperature
B.
Humidity
C.
Wind speed
D.
All the above
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ANSWER :
D. All the above
8.
Evaporation causes _____
A.
Heating
B.
Temperature
C.
Cooling
D.
None of the above
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ANSWER :
C. Cooling
9.
Latent heat of vaporisation is the heat energy required to change 1 kg of a liquid to gas at atmospheric pressure at its _____
A.
Boiling point
B.
Melting point
C.
Condensation
D.
Solidification
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ANSWER :
A. Boiling point
10.
The particles of a solution are smaller than _____ in diameter.
A.
1 cm
B.
1 mm
C.
1 nm
D.
1 km
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ANSWER :
C. 1 nm
11.
At any particular temperature, a solution that has dissolved as much solute as it is capable of dissolving, is said to be a _____ solution
A.
Saturated
B.
Dilute
C.
Concentrated
D.
None of the above
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ANSWER :
A. Saturated
12.
The amount of the solute present in the saturated solution at this temperature is called its _____
A.
Solvent
B.
Solute
C.
Solution
D.
Solubility
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ANSWER :
D. Solubility