CLASS 9
SUBJECT: SCIENCE
Date of Submission-31-05-2019
SUBJECT: SCIENCE
Date of Submission-31-05-2019
Date of Submission-18-06-2018
Date of Submission-08-06-2018
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Date of Submission-05-01-2018
Date of Submission-07-12-2017
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Date of Submission-05-11-2017
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Date of Submission-20-8-17
1. Why do we fall forward if we
alight from a moving bus?
2. Why does an athlete run for
some distance before long jump?
3. Define momentum.
4. State first law of motion.
5. What is inertia?
6. Can action and reaction
balance each other?
7. How does one climb up a rope?
8. Why cannot we walk in space?
9. What does rate of change of
momentum represent?
10. Why do we continuously paddle
to keep the cycle moving?
11. Why does a scooter tend to
skid while executing a sharp turn?
12. Which one would have more inertia : 10 kg
mass & 5 kg mass?
13. Explain the functioning of
shockers in cars.
14. How much force is needed to
pull an object of mass 40 kg in vertically upward direction
with acceleration of 2.2 m / s2.
15.Why does a fan keep moving for
sometime when switched off?
16. What do you mean by
conservation of momentum?
17. Inflated balloon lying on the
surface of a floor moves forward when pricked with a pin.
Why?
Three Marks questions
1. An iron sphere of mass 10 kg
is dropped from a height of 80 cm, if ‘g’ = 10 m / s2.
Calculate the momentum
transferred to the ground by the body.
2. What would be the force
required to stop a car of mass 1000 kg and a loaded truck of
mass 10,000 kg in 2 seconds each
moving with velocity 5 m / s.
3. Deduce law of conservation of
momentum using third law of motion.
Five marks
1. Name and define three
different types of inertia & give an example of each.
2. The volume of a solid of mass
300g is 150 cm3. (i) What will be the density of this solid? (ii)
What will be the mass of Water
displaced by this solid? (iii) What will be the relative density
of the solid? (iv) Will the solid
float or sink in water?
3. Write down he equation for
density .A 10 kg of material X occupy 20 cm3 whereas 30 kg of
material Y can occupy 100cm3.
Which has greater density: X or Y? Support your answer with
calculation.
4. Is the acceleration due to
gravity of the earth ‘g’ a constant? Discuss.Calculate the
acceleration due to gravity on
the surface of a satellite having a mass of 6.5 X 1022 kg and
radius 1.5 X106m. G= 6.7.X 10 -11
Nm2/kg2
CHEMISTRY
Matter around us
1.
Give an activity to show that particles of matter are continuously
moving.
2.
What is meant by diffusion?
3.
Why does diffusion increases with raise in temperature ?
4.
What are the characteristics of particles of matter?
Date of Submission-5-6-17
Q.1 Define matter.
Q.2 what happens if you put copper sulphate crystals in water?
Q.3 A substance has a definite volume but no definite shape? State whether this
substance is a solid, a liquid or a gas.
Q.4 Arrange the following substances in increasing order of force of attraction
between the particles.
(a) Milk (b) Salt (c) Oxygen.
Q.5 A substance has neither a fixed shape nor a fixed volume. State whether it
is a solid, a liquid or a gas.
Q.6 The melting point of a substance is below the room temperature. Predict its
physical state.
Q.7 What is vapour?
Q.8 Name the temperature at which the solid and liquid
states of water can exist together.
Q.9 What is the effect of pressure on boiling point?
Q.10 Name any two substances which sublime.
Q.11 Define Condensation.
Q.12 For any substance, why does the temperature remain constant during the
change of state?
Date of submission-5 June2017
To be done in HW notebook
Chemistry
Differentiate
between different states of matter
Stick
pictures of some substances which can naturally exist in all the three states
Biology
Who
discovered cell?
Draw
labelled diagram of plant cell and animal cell
Write
the difference between plant cell and animal cell
Physics
Differentiate
between different types of motion
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