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

A few of Paheli’s classmates eat potato chips and burgers regularly during the recess at school. Are they healthy eating habits? Give reasons.

Given below are certain food items required for proper nourishment of adolescents. Name the nutrients present in the food items and write their functions.

A water tank has four taps fixed at points A, B, C, D as shown in the following figure. The water will flow out at the same pressure from taps at 

A brick is kept in three different ways on a table as shown in the following figure. The pressure exerted by the brick on the table will be

A	B	C

A chapatti maker is a machine which converts balls of dough into chapatties. What effect of force comes into play in this process?

It is difficult to cut cloth using a pair of scissors with blunt blades. Explain.

Write a paragraph in your own words of the following.

Weeding

What are weeds?

Stages in the life cycle of silkworm are given below. Write them in sequential order.

After observing the above figure, answer the following.

1. Read the following statements and label them in the figure.
   1. The part which produces female gametes.
   2. The part where development of the baby takes place.
   3. The part through which the developing embryo passes to reach the uterus.
2. Explain the future development of the embryo that would take place after it gets embedded in the uterus.

Hens and frogs are both oviparous exhibiting different types of fertilisation. Explain.

We should avoid taking medicines/drugs unless prescribed by a doctor. Give reasons.

Salma had a very soft and smooth skin during her childhood. As she entered adolescence, she developed pimples on her face. The skin specialist advised her to wash her face at regular intervals. Can you explain the reasons for the appearance of pimples on her face and suggest ways to prevent them?

Figure shows a container filled with water. Which of the following statements is correct about pressure of water?

The loudness of sound depends on

Loudness of sound is measured in units of

The loudness of sound is determined by the

Does any part of our body vibrate when we speak? Name the part.

Two astronauts are floating close to each other in space. Can they talk to each other without using any special device? Give reasons.

An alarm bell is kept inside a vessel as shown in the following figure. A person standing close to it can distinctly hear the sound of alarm. Now, if the air inside the vessel is removed completely, how will the loudness of alarm get affected for the same person?