Page 1 - HOME ASSIGNMENT-1(Obj.& Sub.)

SAI International School
Class-IX
Subject-Chemistry
Topic-Matter in our surroundings
Sub topic- Interconversion of different states of matter
OBJECTIVE QUESTIONS
Q.1 450 K temperature may be written in Celsius scale as
(a) 278 ◦C
(b) 450 ◦C
(c) 0 ◦C
(d) 177◦C
Q.2 Addition of impurities to water:
a) decreases the freezing point of water
b) increases the boiling point of water
c) does not affect the freezing or boiling point of water
d) sboth (a) and (b)
Q.3 When ice melts to water, then heat is
a) absorbed
b) evolved
c) no change
d) depends on conditions
Q.4 Choose the correct statement from the following:
a) Conversion of solid into vapours without passing through liquid state
is called vaporisation.
b) Conversion of vapours into solid without passing through the liquid
state is called sublimation.
c) Conversion of vapours into solid without passing through the liquid
state is called freezing.
d) Conversion of solid into liquid is called sublimation.
Q.5 The boiling point of ethane is, -88°C. This temperature will be equivalent
to:
a) 285 K
b) 288 K
c) 185 K
d) 361K
Q.6 Which of the following set of 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.

Q.7 Which of the following process/processes release heat?

(i) condensation

(ii) vaporisation

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