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

What is a virtual image? 

Give one use each of a concave and a convex mirror.

Which type of mirror can form a real image?

A virtual image larger than the object can be produced by a ______.

Two organisms are good friends and live together. One provides shelter, water, and nutrients while the other prepares and provides food. Such an association of organisms is termed as ______.

The finger-like outgrowths of Amoeba helps to ingest food. However, the finger-like outgrowths of human intestine helps to ______.

Read the following statements with reference to the villi of small intestine.

1. They have very thin walls.
2. They have a network of thin and small blood vessels close to the surface.
3. They have small pores through which food can easily pass.
4. They are finger-like projections

Identify those statements which enable the villi to absorb digested food.

Name the parts of the alimentary canal where digested food gets absorbed.

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

Match the organs in Column I with the words listed in Column II.

A curtain is hanging at the entrance of a room. A long corridor runs at right angles to the door, that is parallel to the curtain. If a strong wind blows along the corridor, the curtain will ______.

Identify the names of six natural phenomena from the following word diagram given in figure.

Two clocks A and B are shown in the following figure. Clock A has an hour and a minute hand, whereas clock B has an hour hand, a minute hand as well as a second hand. Which of the following statement is correct for these clocks?

A shopkeeper wanted to fix a mirror which will give a maximum view of his shop. What type of mirror should he use? Give reason.

A jumbled word is given here. Write the correct form of the word.

WASHFERRET

Water is very precious for all living beings. What will happen in future if we do not save water now?

Visit a doctor and find out:

1. Under what conditions does a patient need to be on a drip of glucose?
2. Till when does a patient need to be given glucose?
3. How does glucose help the patient recover?

Write the answers in your notebook.

Observe fish in an aquarium. You will find flap like structures on both sides of their heads. These are flaps which cover the gills. These flaps open and close alternately. On the basis of these observations, explain the process of respiration in the fish.

You can perform an interesting activity when you visit a park to ride a swing. You will require a watch. Make the swing oscillate without anyone sitting on it. Find its time period in the same way as you did for the pendulum. Make sure that there are no jerks in the motion of the swing. Ask one of your friends to sit on the swing. Push it once and let it swing naturally. Again measure its time period. Repeat the activity with different persons sitting on the swing. Compare the time period of the swing measured in different cases. What conclusions do you draw from this activity?

Visit a nearby hospital. You can also visit the clinic of an ENT specialist, or a dentist. Request the doctor to show you the mirrors used for examining ear, nose, throat and teeth. Can you recognise the kind of mirror used in these instruments?