Secondary School (English Medium) (5 to 8) इयत्ता ८ - CBSE Question Bank Solutions for Science

From the word puzzle given as figure. Find at least eight words which are ‘farmer’s friends’. Classify them into living and non-living.

Unscramble the words related to crop production and its management and write in the boxes given beneath them.

Now, using the circled letters, form one word which is an activity carried out in fields, after maturation of crops.

Terrycot is made by mixing two types of fibres. Write the names of the fibres.

A lady went to the market to buy a blanket. The shopkeeper showed her blankets made of acrylic fibres as well as made of wool. She preferred to buy an acrylic blanket. Can you guess why?

A polymer is a chain of many small units joined together which are called ______.

A fibre similar to wool is ______.

Match items in List A with the items of list B.

Unscramble the jumbled word given below, related to synthetic material.

Felton

Paheli prepared a blue coloured solution of copper sulphate in beaker A and placed an iron nail in it. Boojho prepared a yellowish green solution of ferrous sulphate in beaker B and placed a copper wire in it. What changes will they observe in the two beakers after an hour?

Match the substances in Column A with their applications given in Column B.

Some of the following statements are incorrect. Find the incorrect statements and correct them.

1. The property of metals by virtue of which they can be drawn into wires is called ductility.
2. Metals are good conductors of electricity but poor conductor of heat.
3. Articles made up of metals produce ringing sound when struck hard.
4. Oxides of non-metals and metals are acidic in nature.
5. A less reactive metal displaces a more reactive metal from its salt solution in water.

Fill in the blanks to complete the following paragraph.

The name of the product formed in the reaction of sulphur and ______ is sulphur dioxide gas. When sulphur dioxide is dissolved in  ______, sulphurous acid is formed. The sulphurous acid turns  ______ litmus paper to ______. Generally oxides of  ______ are acidic in nature.

After completing the paragraph, write two questions which you can raise on the basis of this information.

Complete the crossword given in the figure with the help of the clues.

Across

1. Which is generally hard, ductile, malleable and sonorous.

2. A metal is called so it can be drawn into wires.

3. Metal bells are used because of this property.

Down

4. A metal generally used for making jewellery.

5. A metal which is liquid at room temperature.

6. A metal which reacts with acid as well as base to form hydrogen gas.

7. Substances used to enhance the growth of plants.

8. Property by virtue of which metals can be beaten into thin sheets.

Various materials which are obtained from nature are called natural resources. Which of the following is not a natural resource?

Air is a natural resource and cannot be exhausted by human activities. It is known as inexhaustible natural resource. Which of the following is another inexhaustible natural resource?

Which of the following is a pair of exhaustible natural resources?

Exhaustible natural resources are

Coal is one of the ______ used to cook food.

The underlined word in the following sentence have been jumbled up. Write them in their correct form.

Nutsgilh is an example of inexhaustible natural resources.

Write True/False against the following statement.

Oxygen in air is an exhaustible natural resource.