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IX Class Physics Holidays Homework Assignment 2009-2010 1.

Make a short note on ‘JOURNEY OF LIFE’ of given scientists : Issac NewtonArchimedes

2.

Plan to go to a place by an vehicle. Take readings of odometer and speedometer after every 5 minutes till you reach your destination. Record these observations in tabular form ; plot graphs between distance-time and speed time. State whether this motion is uniform or non-uniform.

3.

Make a short project report (with pictures) on following:

a)

Hearing Aid (its basic construction, principle and how it is beneficial to people having hearing disorder?)

b)

Ultrasonography (basic principle behind this technique and its uses). Visit any Diagnostic Centre near your home for details.

c)

Visit National Science Centre, Delhi (near Pragati Maidan) and list 5 models based on Force and Laws of Motion. Your may use Wikipedia for more information on these topics.

Chemistry Chapter- Matter in our Surroundings 1.

Define matter. What are the two ways of classification of matter?

2.

What is the effect of temperature on particle motion?

3.

Define diffusion. Why diffusion is greater in gases and not in solids?

4.

Among the three states of matter, which has minimum inter particle spaces?

5.

A substance has neither definite shape nor definite volume. What does its physical state represent?

6.

What is the physical state of water at 100C?

7.

Why does a gas fill the entire available space?

8.

Why gases are compressed but not liquids? Explain.

9.

Write the full names of 1) LPG ii) CNG

10

.What are two different ways by which we can bring about the change of state?

11.

Define latent heat of fusion.

12.

What is the significant of the melting point temperature?

13.

A) Give the relation between Fahrenheit scale and Celsius scale

14.

The room temperature on Celsius scale is 250C. Convert it into the other two scales of measurement.

15.

The body temperature of a normal and healthy person is 98.40F. What is the temperature on the Celsius scale?

16.

Define latent heat of vaporization. What is the effect of disease in temperature on the physical state of matter?

17.

Define sublimation. Give at least 2 examples of substance which undergo sublimation.

18.

Does the temperature of a solid change when it starts melting?

19.

Are the melting point temperature of solid and the freezing point of temperature of liquid same or different.

20.

A solids melts at 200C. Convert this temperature into Kelvin temperature.

21.

Convert the following temperature at Kelvin scale- 1) 300C 2) 2730c

22.

Convert the following temperature to Celsius scale. a) 200 K

b) 450 K

23.

The melting points of two solids A and B are 300K and 350 K respectively. Which has more inter particles forces?

24.

A rubber band changes its shape when stretched. Can it be regarded as solid?

25.

What are the factors which are responsible for bringing a change in the physical state of a substance?

26.

Explain why there is no rise in temperature of a substance when it undergoes a change of state although it is still being heated.

27.

Why are gases highly compressible?

28.

Does the temperature of liquid increase further when it starts boiling?

29.

Why do we sweat more on a humid day?

30.

The latent heat of vaporization of steam is more than that of the boiling water. Explain.

31.

A substance ‘X’ was highly compressible and could be easily liquefied. It could also take up the shape of any container. Predict the nature of the substance and write four properties of this state of matter.

Biology 1.

Prepare five riddles about any five organelles that are found in the cell. Here is an example: For getting energy, this organelle is the key It has chemical reactions that produce ATP Answer: mitochondrion

2 • • •

Prepare a model of plant cell/animal cell. The model should not exceed a size of 12’’ by 18’’. It can be made in groups (maximum- 3 students per group). Do not use plastic / thermocol for making the model. The model should be interactive i.e. can be in the form of a puzzle, or, in the form where if an organelle part is moved, the function is visible. Make good use of your imagination. OR Prepare a scrap book/ video/ Power Point Presentation of a biological phenomenon: (Examples – biogeochemical cycles, working of cell organelles, types of tissues, diversity in plant kingdom, diversity in animal kingdom, vertebrates, acute diseases, chronic diseases, inflammation, vaccinations- past and present etc.)