Secondary School (English Medium) (5 to 8) Class 7 - CBSE Question Bank Solutions for Science

The hotness of an object is determined by its ______.

Temperature is measured in degree ______.

One litre of water at 30°C is mixed with one litre of water at 50°C. The temperature of the mixture will be ______.

An iron ball at 40°C is dropped in a mug containing water at 40°C.

The heat will ______.

Explain why An antacid tablet is taken when you suffer from acidity.

Explain why Calamine solution is applied on the skin when an ant bites.

Explain why factory waste is neutralised before disposing it into the water bodies.

Describe how crystals of copper sulphate are prepared.

Fill the missing word in the blank spaces in the following statements:

Near the earth’s surface _____ air rises up whereas _______  air comes down.

Name any two effects of electric current.

When current is switched ‘on’ in a room heater, it ______.

The safety device based on the heating effect of electric current is called a ______.

Explain the factors responsible for the depletion of water table.

The term that is used for the mode of nutrition in yeast, mushroom and bread-mould is ______.

Choose the odd one out from the group and give a reason.

liver, salivary gland, starch, gall bladder

______ is the largest gland in the human body.

State whether the following statement is True or False. If false, correct them.

Yak hair is not used to make woollen fabric.

Shopkeepers selling ice blocks usually cover them with jute sacks. Explain why.

‘Litmus’, a natural dye is an extract of which of the following?

State whether the following statement is true or false. Correct the false statement.

Common salt dissolved in water turns blue litmus red.