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This is year 348 BC. Aristotle is a famous Greek philosopher and scientist. One day he suddenly wakes up into future - The year 2017. He observes that the world has changed a lot.
Out of the following observations made by him, which observations are examples of change?

Define the process of spinning?

How is churning a sort of separation?

Which of the following is not a greenhouse gas?

Which of the following correctly shows the process of weaving?

Photosynthesis involves the consumption of:

Vapour pressure of a liquid decreases with increase in:

Fill in the blanks :

(a) The liquid in the earth’s core has a temperature of about ……………. .

(b) …………., ….……., ……….., are factors necessary for the existence of living things.

(c) The ……………. rays of the sun are absorbed in the atmosphere.

(d) ………………. % of the earth’s surface consists of water.

(e) We get useful substances like ……………., ……………., from sea water.

Question 5
The type of pollution which is likely to affect TajMahal in Agra to a greater extent is
(a) Air pollution
(b) Water pollution
(c) Soil pollution
(d) Noise pollution

Question 4

What is the greenhouse effect?

Which of the following statements about a mixture is TRUE?

What kind of water taps are fitted in railway compartments? Why?

Industrial wastes, oils and fats should not be released into the rivers and ponds because they can:

Which method is best suited for the separation of a mixture of acetone and water?

Does Frank seem to encourage Taplow's comments on Crocker-Harris?

Match the $\frac{C_p}{C_v}$ ratio for ideal gases with different types of molecules:

Explain briefly what is meant by environment.

Water pollution can be classified as ___ .

Read the following passage carefully.

One day Meena plucks a mango and brings it home. Her grandmother gives the larger piece to Raju because he is a boy. Meena protests. After all, she brought the mango and she is the elder of the two. She insists she has a greater right over her share. Her father comes to her help and divides the mango equally.



Now answer the questions.

(i) Who brought the mango home?

(ii) Why did Meena’s grandmother give a larger piece to Raju?

(iii) Who do you think should have got the larger piece?



1. Using the following clues write about yourself in the space below — name, place you live in, physical features, habits, likes and dislikes etc.

________________________________________________________

________________________________________________________

________________________________________________________

________________________________________________________



2. What are the things your mother asks you to do?

The loss of groundwater level is due to:

In a coffee machine, the ground coffee beans are separated from the coffee solution by using a/an ______.

Question 23

Find out the wrong statements and write them in their correct form.

(i) We can survive for some time without air but we cannot survive even for a few minutes without food.

(ii) A brick kiln emits a lot of smoke and other harmful gases causing air pollution.

(iii) Carbon monoxide is produced by the complete burning of fuels such as coal, petrol, diesel.

(iv) Chlorination is a commonly used chemical method for killing germs in water.

(v) Water which is suitable for drinking is called soft water.

Identify a cleaner fuel which is used in vehicles from the given options.

Question 2:

Can we reverse the following changes? If yes, suggest the name of the method.

(a) Water into water vapour

(b) Water vapour into water

(c) Ice into water

(d) Curd into milk