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

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

Phenolphthalein is a natural indicator.

Turmeric and litmus are ______ acid-base indicators.

Give an example of a chemical reaction for the following situation:

A gas is evolved

If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.

Give two other examples of a similar type of change.

Which of the following statement is incorrect for penguins?

Figure shows a diagrammatic representation of trees in the afternoon along a sea coast. State on which side is the sea; A or B? Give reasons for your choice.

When strong/high-speed wind blows, an umbrella held upright at times gets upturned. Explain the reason.

Availability of water and minerals in the soil for maximum absorption by roots is in the –

Soil has particles of different sizes. Arrange the words given below in increasing order of their particle size.

Boojho walks to his school which is at a distance of 3 km from his home in 30 minutes. On reaching he finds that the school is closed and comes back by a bicycle with his friend and reaches home in 20 minutes. His average speed in km/h is ______.

A combination of two or more cells is called a ______.

Unscramble the following words:

HICWTS

Draw the symbols of the following circuit components.

Electric cell

Suppose we wish to obtain the real image of a distant tree. Explain two possible ways in which we can do it.

Which of the following are not the liquid forms of water?

1. Snow
2. Lake water
3. River water
4. Water vapour
5. Ice

Choose the correct combination from the options below.

Water cycle does not involve which of the following?

Which of the following inhibits the seepage of rainwater into ground?

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

Water vapour is the gaseous form of water

Some definitions are given below which can be corrected by changing one word. Correct them.

1. Aquifer is ground water stored between layers of hard rock above the water table.
2. The process of evaporation of water in the ground is called infiltration.
3. The evaporation of water from oceans and its arrival back into oceans is called vapour cycle.

Fill in the blanks in the given passage.

The rainwater and ______ from other sources such as rivers and ponds seeps through the ______ and fills the empty spaces and cracks deep below the ground. The process of seeping of water into the ground is called ______.