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

Explain why a charged balloon is repelled by another charged balloon whereas an uncharged balloon is attracted by another charged balloon?

State the laws of reflection.

Describe an activity to show that the incident ray, the reflected ray and the normal at the point of incidence lie in the same plane.

A person 1 m in front of a plane mirror seems to be ______ m away from his image.

If you touch your ______ ear with your right hand in front of a plane mirror, it will be seen in the mirror that your right ear is touched with your ______.

Angle of incidence is equal to the angle of reflection.

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.