CBSE class 9 Science Quiz | CBSE class 9 Science Short Questions & Answers

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Questions
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

Answer: Gases
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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

Answer: decreases
44 ______ is the formation of liquid drops from vapour.
A Evaporation
B Condensation
C Boiling
D Melting

Answer: Condensation
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

Answer: Sublimation
46 The phase or state of matter can change when the ______ of the substance changes.
A amount
B mass
C temperature
D weight

Answer: temperature
47 During summer, water kept in an earthen pot becomes cool because of the phenomenon of
A evaporation
B osmosis
C diffusion
D transpiration

Answer: evaporation
48 Solids are usually ______ since their particles are closely packed together.
A soft
B spongy
C compressible
D hard

Answer: 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

Answer: Density
51 The space inside a container that is occupied by matter is its ______.
A volume
B shape
C density
D mass

Answer: volume
52 ______ is a physical quantity which expresses the amount of matter in a body.
A Mass
B Density
C Volume
D Temperature

Answer: Mass
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

Answer: Rusting of iron
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

Answer: Distillation
58 A mixture of water and silver chloride can be separated by
A Filtration
B Sublimation
C Centrifugation
D Sedimentation

Answer: Filtration
59 Removal of clear layer of the liquid without disturbing the settled solid is known as __________.
A Evaporation
B Sedimentation
C Decantation
D Filtration

Answer: Decantation
60 How can we separate cream from milk?
A Distillation
B Chromatography
C Centrifugation
D Sublimation

Answer: Centrifugation

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