Secondary School (English Medium) (5 to 8) इयत्ता ८ - CBSE Question Bank Solutions for Science

Image formed by a plane mirror is ______.

What is the angle of incidence of a ray if the reflected ray is at an angle of 90° to the incident ray?

Boojho stands at A just on the side of a plane mirror as shown in figure. Can he see himself in the mirror? Also can he see the image of objects situated at P, Q and R?

1. Find out the position of the image of an object situated at A in the plane mirror.
2. Can Paheli at B see this image?
3. Can Boojho at C see this image?
4. When Paheli moves from B to C, where does the image of A move?
   

Which of the following is NOT a member of the solar system?

Fill in the blanks:

A group of stars that appear to form a pattern in the sky is known as a __ _________.

Mark the following statement as true (T) or false (F)

Constellation Orion can be seen only with a telescope. ( )

What is a constellation? Name any two constellations.

Draw sketches to show the relative position of prominent stars in Ursa Major

Draw sketches to show the relative position of prominent stars in Orion

Which of the following is not a greenhouse gas?

Describe the Greenhouse Effect in your own words.

Prepare a brief speech on global warming. You have to deliver the speech in your class.

Coal tar is a mixture of various substances.

Match the agricultural implements given in Column A with their use given in Column B.

(i) ______; (ii) ______; (iii) ______; (iv) ______ 

What are organic foods?

Terms related to agricultural practices are given below. Rearrange them in the correct sequence,

Pathogenic micro-organisms present in host cells are killed by medicines called

The two micro-organisms which live in symbiotic association in lichens are

The disease caused by a protozoan and spread by an insect is ______.