EICHER SCHOOL, FARIDABAD

SESSION-2022-23
HOLIDAY HOMEWORK
CLASS IX

PHYSICS

1 Derive the three equations of motion analytically.

2 Draw position time, velocity time and acceleration time graphs for
A. Body at rest
B. Body in uniform motion
C. Body accelerating uniformly
D. Body deacceleratng uniformly.
3 Derive the three equations of motion graphically.
4 Calculate the acceleration of a body which starts from rest and travels
87.5m 5 sec?
5 Calculate the acceleration and distance of the body moving with 5m/s2
which comes to rest after traveling for 6sec?
6 A body is moving with a velocity of 12m/s and it comes to rest in 18m, what
was the acceleration?
7 A body starts from rest and moves with a uniform acceleration of 4m/s2
until it travels a distance of 800m, find the find velocity?
8. The driver of a car traveling along a straight road with a speed of 72KM ph
observes a signboard which give the speed limit to be 54KM ph. The
signboard is 70m ahead when the driver applies the brakes. calculate the
acceleration of the car which will cause the car to pass the signboard at
the stated speed limit? 6. Two cars A and B are moving along in a straight
line. Car A is moving at a speed of 80KMph while car B is moving at a
speed 50KMph in the same direction, find the magnitude and direction of
(a) the relative velocity of car A with respect to B
(b) The relative velocity of car B with respect to A.
9. A car moving with a certain velocity comes to a halt if the retardation was
5m/s, find the initial velocity of the car?
10 A ball starts from rest and rolls down 16m down an inclined plane in 4 s.
(a) What is the acceleration of the ball?
(b) What is the velocity of the ball at the bottom of the incline?
11 A body is dropped from a height of 320m. The acceleration due to the
gravity is 10m/s²?
(a) How long does it take to reach the ground?
(b) What is the velocity with which it will strike the ground?
12. A boy throws a stone upward with a velocity of 60m/s. (a) How long will it
take to reach the maximum height (g = -10m/s)? (b) What is the
maximum height reached by the ball? (c) How long will it take to reach
the ground?

13.In your everyday life you come across a range of motions in which

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 o acceleration is in the direction of motion,
o acceleration is against the direction of motion,
o acceleration is uniform,
o acceleration is non-uniform.
 Can you identify one example each of the above type of motion?

14.The times of arrival and departure of a train at three stations A, B and C and the
distance of stations B and C from station A are given in table 4.

Table 4 Distances of stations B and C from A and times of arrival and

departure of the train

Distance from A Time of arrival Time of departure

Station
(km) (hours) (hours)
A 0 08:00 08:15
B 120 11:15 11:30
C 180 13:00 13:15

 Plot and interpret the distance-time graph for the train assuming that its motion
between any two stations is uniform.

15.Take a piece of thread and tie a small piece of stone at one of its ends. Move the
stone to describe a circular path with constant speed by holding the thread at the
other end, as shown in Fig. 10.

A stone describing a circular path with a velocity of constant magnitude.

 Now, let the stone go by releasing the thread.

 Can you tell the direction in which the stone moves after it is released?
 By repeating the activity for a few times and releasing the stone at different
positions of the circular path, check whether the direction in which the stone
moves remains the same or not.

16.Find the distance covered by a particle during the time interval t=0 and t=4s for
which the speed time graph is shown in figure:

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17Figure shows distance time graph of three objects A ,B and C
a. which object is moving with a greater speed
b. which object is moving with slowest speed

18.The data regarding the motion of two different objects P and Q is given in the
following table. Examine them carefully and state whether the motion of the objects is
uniform or non-uniform.

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19.Given below is the velocity-time graph for the motion of the car. What does the
nature of the graph show ? Also find the acceleration of the car.

20.Study the speed-time graph of a body given here and answer the following
questions:

(a) What type of motion is represented by OA?

(b) What type of motion is represented by AB?
(c) What type of motion is represented by BC?
(d) Find out the acceleration of the body.
(e) Calculate the retardation of the body.
(f) Find out the distance travelled by the body from A to B.

BIOLOGY
1. Why is plasma membrane called selectively permeable membrane?
2. Differentiate between rough and smooth endoplasmic reticulum. How is
endoplasmic reticulum important for membrane biogenesis?
3. Give the roles of the following:
(i) Lipids and proteins of plasma membrane.
(ii) Cellulose in the cell wall.

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 (iii) Flexible nature of the cell membrane.
(iv) Hydrolytic enzymes of lysosomes.
(v) Ribosomes present on the RER.
4. (i) In what form do mitochondria releases energy? Write its full form.
(ii) The inner membrane of mitochondria is deeply folded. What is the
advantage of these folds?
5. Describe an activity to demonstrate endosmosis and exosmosis. Draw a
diagram also.
6. Differentiate between diffusion and osmosis. Write any two examples where a
living organism uses osmosis to absorb water.
7. (i) What would happen to the life of the cell if there was no Golgi apparatus?
(ii) Which cell organelle detoxifies poisons and drugs in the liver of
vertebrates?
8. Write the functions of:
(i) Inner membrane of mitochondria
(ii) Nucleus of the cell
(iii) Ribosomes present in active cells.
9. In brief state what happens when
(i) dry apricots are left for sometime in pure water and later transferred to
sugar solution?
(ii) a red blood cell is kept in concentrated saline solution?
(iii) the plasma-membrane of a cell breaks down?
(iv)golgi apparatus is removed from the cell?
10. State reasons for the following:
(i) Mitochondria are known as the powerhouse of the cell.
(ii) Plastids are able to make their own protein.
(iii) Plant cell shrinks when kept in hypertonic solution.
11. Draw a plant cell and label the parts which:
(i) determines the function and development of the cell.
(ii) package materials coming from the endoplasmic reticulum.
(iii) provides resistance to microbes to withstand hypotonic external media
without bursting.
(iv) is site for many biochemical reactions necessary to sustain life.
(v) is a fluid contained inside the nucleus.

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 12. Why are plants and animals made of different types of tissue?
13. Write a short note on the different types of meristematic tissue with their
location and functions in the plants.
14. Show the diagrammatic representation of location of lateral meristem and
intercalary meristem in plant body.
15. State the characteristics of prokaryotic cells.
16. Multicellular organisms exhibit division of labour. Comment.
17. Why is cell the basic unit of life?
18. Describe the cell theory in brief.
19. Differentiate between Rough Endoplasmic Reticulum
and Smooth Endoplasmic Reticulum.
20. Why are mitochondria known as the “powerhouse of the cell”?
21.Make a PPT of 7-10 slides showing various organelles of cell and their role
and position.
22. Take plaster of paris and a rectangular and circular pan or cardboard box.
Collectdifferent objects resembling different organelles. Mix plaster of paris in
water and pour it in both the containers. Add these objects before the plaster of
paris solidifies. Ensure that you are able to highlight the differences between
plant and animalcells through this model. You can make a similar model with
gelatine instead of plaster of paris.

CHEMISTRY

1 Define diffusion
2 With the help of an example show that the rate of diffusion is directly
proportional to temperature.
3 List the characteristics of solid state of matter.
4 Give reason for the following
a. Solids can not be termed as fluids.
b. Light can not be considered as matter.
c. Smell of agarbattican not be contained in an open area for a long time.
d. Sponge is a solid but can be compressed easily.
e. Generally Solids can not be compressed.

5 What is Viscosity ? How is it related to density ?

6 For any substance , which physical term has same value as boiling point ?
7 State the following
a. Freezing point of water
b. Unit to express latent heat
c. Process by which any solid directly changes to its gaseous form.

8 Draw a diagram to show change of state of water from solid to liquid state.
Show heat exchange at different stages and at freezing point temperature.

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