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Free download in PDF CBSE class 9 Science Short Questions & Answers. Here Gkseries provide Science Solve Questions and Answers for CBSE class 9 Students.
41
Thermal conduction takes places in
[A]
solids, liquids and gases.
[B]
gases only
[C]
liquids only
[D]
solids only
Answer: solids, liquids and gases.
42
Rate of diffusion is the fastest in
[A]
Solids
[B]
Liquids
[C]
Gases
[D]
None of these
43
When a sample of hot water is cooled slowly to room temperature, the temperature of the sample _______.
[A]
decreases
[B]
remains constant
[C]
increases
[D]
either increases or decreases
44
______ is the formation of liquid drops from vapour.
[A]
Evaporation
[B]
Condensation
[C]
Boiling
[D]
Melting
45
______ is a process in which solids go directly into gaseous state without going through the liquid state.
[A]
Sublimation
[B]
Boiling
[C]
Evaporation
[D]
Melting
46
The phase or state of matter can change when the ______ of the substance changes.
[A]
amount
[B]
mass
[C]
temperature
[D]
weight
47
During summer, water kept in an earthen pot becomes cool because of the phenomenon of
[A]
evaporation
[B]
osmosis
[C]
diffusion
[D]
transpiration
48
Solids are usually ______ since their particles are closely packed together.
[A]
soft
[B]
spongy
[C]
compressible
[D]
hard
49
Which one of the following sets of phenomena would increase on raising the temperature?
[A]
Evaporation, diffusion, expansion of gases
[B]
Evaporation, solubility, diffusion, compression of gases
[C]
Diffusion, evaporation, compression of gases
[D]
Evaporation, compression of gases, solubility
Answer: Evaporation, diffusion, expansion of gases
50
______ is the ratio of mass of a substance to its volume.
[A]
Density
[B]
Elasticity
[C]
Viscosity
[D]
Fluidity
51
The space inside a container that is occupied by matter is its ______.
[A]
volume
[B]
shape
[C]
density
[D]
mass
52
______ is a physical quantity which expresses the amount of matter in a body.
[A]
Mass
[B]
Density
[C]
Volume
[D]
Temperature
53
Which one of the following is TRUE for compounds?
[A]
It has fixed melting and boiling point.
[B]
It can be separated by physical methods.
[C]
It may be homogeneous or heterogeneous.
[D]
It shows properties of its constituents.
Answer: It has fixed melting and boiling point.
54
Which of the following is a chemical change?
[A]
Boiling of water into steam
[B]
Rusting of iron
[C]
Melting of ice
[D]
Dissolving salt in water
55
The particles of a suspension will be of size ________
[A]
greater than 100nm
[B]
less than 0.1 nm
[C]
less than 1nm (nm = nano metre)
[D]
between 1nm to 100 nm
Answer: greater than 100nm
56
Solution which has uniform composition throughout is called ___________.
[A]
homogeneous solution
[B]
heterogeneous solution
[C]
Colloidal solution
[D]
None of these
Answer: homogeneous solution
57
When two liquids in a mixture differ by their boiling points, which of the following is the best method to separate these liquids?
[A]
Filtration
[B]
Evaporation
[C]
Chromatography
[D]
Distillation
58
A mixture of water and silver chloride can be separated by
[A]
Filtration
[B]
Sublimation
[C]
Centrifugation
[D]
Sedimentation
59
Removal of clear layer of the liquid without disturbing the settled solid is known as __________.
[A]
Evaporation
[B]
Sedimentation
[C]
Decantation
[D]
Filtration
60
How can we separate cream from milk?
[A]
Distillation
[B]
Chromatography
[C]
Centrifugation
[D]
Sublimation
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