Q NO SECTION A MARKS
1 Many modern tanks for water and liquid fuels are made spherical in nature 1
what could be the reason behind this?
a) It is easier to build spherical tanks of other shapes
b) for a given surface area, spherical tanks enclosed maximum value
c) It is easier to transport spherical tanks when repair etc. are required
liquid get preserved better when they are stored in spherical tanks
2 Which phase change at standard temperature and pressure represents 1
sublimation?
a) CO(s)-CO(g)
b) H(I)-H(g)
c) CO(I)-CO(g)
D. H(s)-H(I)
3 People sometimes add salt to the water in Which eggs are to be boiled. 1
What is the MAIN reason for this?
a) Adding salt to the Water before the Egg is cooked makes the egg tastier.
b) Adding salt to the water increases its Boiling point and cooks the egg
better
c) Adding salt to the water Reduces the water Temperature cooking the egg
faster.
d) Adding salt to the Water kills micro Organisms making the egg safer to eat.
4 Rama suspects that the LPG cylinder is Leaking, and immediately turns the 1
Cylinder valve to the OFF position. What Should she do next?
a) Switch on all lights.
b) Switch off all lights.
c) Open all the windows
d) Close all the Windows.
5 It is easier to break a piece of chalk than an iron nail. Which characteristic 1
property of a matter is it mentioning about?
a. Particles are continuously moving
b. particles of matter attract each other.
c. Inter mixing of particles pf different types
d. Latent heat of vaporization
6 Units of temperature 1
a. Bar and pascal
b. Milligram and kilogram
c. Degree Celsius and kelvin
d. Gram per centimeter cube and kilogram per meter cube
Directions: In each of the following questions, a statement of Assertion is
given, and a corresponding statement of Reason is given just below it. Of the
statements, given below, mark the correct answer as:
(a) Both assertion and reason are true, and reason is the correct explanation of
assertion.
(b) Both assertion and reason are true, but reason is not the correct explanation
of assertion.
(c) Assertion is true, but reason is false.
(d) Assertion is false, but reason is true
SCIENCE HOLIDAY HOMEWORK (2025-26)
CLASS-IX
7 Assertion: Disinfectants are rubbed on our hands before taking injections 1
and it feels cold.
Reason: Particles of disinfectant gains energy from the surroundings and
evaporate and leaves our handSECTIONcold. C
814 The temperature
Assertion: Steam ofis amore
substance remains
dangerous thanconstant during its
boiled water 31
melting point or boiling point. Explain the reason
Reason: Solid particles have high melting point than behind it.
water.
SECTION B
915 a. Rita made a lemon juice and
Read the following situations and added some ice
categories cubes
them intointo it. She/ osmosis
diffusion 32
observed
a. Smell ofthat ice floated
biriyani whileinpassing
the juice. Give athe
through reason for this.
restaurant.
b. Plants use carbon dioxide for photosynthesis. Mention its natural state.
b. Spread of corona virus
How is it different from dry ice.?
c. Swelling of Chana when soaked in water
d. Earth worm dying when salt is sprinkled over it.
16 3
10 Camphor is a substance that we use for lighting lamp. 2
a. List the state of camphor before and after burning.
b. elaborates the process
11 Reem was making steam cake. 2
Suddenly she felt intense heat from the
puff of steam gushing out of the vessel.
She wondered whether the temperature
of the steam was higher than that of the
water boiling in the kettle. Comment.
Interconversion of state of matter is a natural phenomenon.
Observe the picture and explain the conversion of matter taking place.
12 a. Boilingabout
Mention pointtheofenergy
Alcohol is 78 also.
transfer degree Celsius. Convert it into Kelvin 2
scale. b. also mentions the physical state of water at 100 degree Celsius.
13 Dried raisins were put in water,SECTION
and it was D
observed after some time that it 2
17 swells. Mention the phenomenon and Explain.
Observe the picture given below and suggest which of the vessels A, B, C 5
or D will have the highest rate of evaporation?
Explain with reference to each vessel.
18 Matter exist in three states. Compare and write the properties of different 5
states of matter.
SECTION E
19 Evaporation causes natural cooling. The basic concept is that in order for 4
matter to change state, it must either receive or lose energy. When
molecules of matter changes from liquid to gas, they require energy to
overcome their potential energy through kinetic energy. As a result, the
liquid absorbs energy from its surroundings.
a. Clothes dry faster in a winter day than on a rainy day. Why?
b. It is easy to drink a hot tea from a saucer faster than from a cup. Why?
c. Evaporation requires energy. Explain.
1
20 In an experimental activity, crushed ice was taken in a beaker. A 4
thermometer is fitted in such a way that its bulb was thoroughly surrounded
by ice. The beaker is now slowly heated and the temperature was regularly
noted. The temperature rises gradually as the heating is continued and
becomes constant when the ice starts changing into liquid.
a) Where does the heat energy go when the temperature does not rise?
b) Name the process explained here.
c)Differentiate melting and boiling point.
EXTRA QUESTIONS: -
a) What is plasmolysis?
b) What would you predict to happen if you put the cell in a solution which is having the same amount of
solute concentration as inside the cell?
c)If Geetha places a plasmolyzed cell in a hypotonic solution, what do you think would happen to the cell?
What term can you give such a cell after the process?
Prepare one working model individual or make a group of two students on any one topic from the
following themes.
a) Waste management b) Food and Health
c) Transport d) Resource management
e) Disaster management f) Natural Farming
h) Math’s & computation
