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

A purple coloured non-metal forms a brown solution in alcohol which is applied on wounds as an antiseptic. Name the non-metal.

The movement of the earth’s plates causes

Which of the following is not likely to cause Tsunami?

The earth’s plate responsible for causing earthquakes is ______.

The outermost layer of earth is called

Major earthquakes are less likely to occur in

Consider the list of terms given below:

1. Tsunami
2. Landslides
3. Floods
4. Lightning

Earthquakes can cause

State whether the following statement is True or False.

Earthquakes occur all the time all over the world. 

State whether the following statement is True or False.

The plates of the outermost layer of the earth are always in continuous motion.

State whether the following statement is True or False.

Tremors on the earth can also be caused by the eruption of a volcano.

State whether the following statement is True or False.

The process of electric discharge cannot occur between clouds and the earth.

Is it possible to predict the occurrence of an earthquake?

What is irrigation?

Categorize the materials of the following products into ‘can be recycled’ and ‘cannot be recycled’.

Telephone instruments, plastic toys, cooker handles, carry bags, ball point pens, plastic bowls, plastic covering on electrical wires, plastic chairs, electrical switches.

‘Avoid plastics as far as possible’. Comment on this advice.

An archer stretches her bow while taking aim at the target. She then releases the arrow, which begins to move towards the target. Based on this information fill up the gap in the following statement using the following terms.

The type of force responsible for a change in the state of motion of the arrow is an example of a ______ force.

A blacksmith hammers a hot piece of iron while making a tool. How does the force due to hammering affect the piece of iron?

An inflated balloon was pressed against a wall after it has been rubbed with a piece of synthetic cloth. It was found that the balloon sticks to the wall. What force might be responsible for the attraction between the balloon and the wall?

Name the forces acting on a plastic bucket containing water held above ground level in your hand. Discuss why the forces acting on the bucket do not bring a change in its state of motion.

A rocket has been fired upwards to launch a satellite in its orbit. Name the two forces acting on the rocket immediately after leaving the launching pad.