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

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

[12] Some Natural Phenomena
Chapter: [12] Some Natural Phenomena
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State the laws of reflection.

[13] Light
Chapter: [13] Light
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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.

[13] Light
Chapter: [13] Light
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A person 1 m in front of a plane mirror seems to be ______ m away from his image.

[13] Light
Chapter: [13] Light
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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 ______.

[13] Light
Chapter: [13] Light
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Angle of incidence is equal to the angle of reflection.

[13] Light
Chapter: [13] Light
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Image formed by a plane mirror is ______.

[13] Light
Chapter: [13] Light
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What is the angle of incidence of a ray if the reflected ray is at an angle of 90° to the incident ray?

[13] Light
Chapter: [13] Light
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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?

[13] Light
Chapter: [13] Light
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  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?
[13] Light
Chapter: [13] Light
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Which of the following is NOT a member of the solar system?

[17] Star and Solar System
Chapter: [17] Star and Solar System
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Fill in the blanks:

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

[17] Star and Solar System
Chapter: [17] Star and Solar System
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Mark the following statement as true (T) or false (F)

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

[17] Star and Solar System
Chapter: [17] Star and Solar System
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What is a constellation? Name any two constellations.

[17] Star and Solar System
Chapter: [17] Star and Solar System
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Draw sketches to show the relative position of prominent stars in Ursa Major

[17] Star and Solar System
Chapter: [17] Star and Solar System
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Draw sketches to show the relative position of prominent stars in Orion

[17] Star and Solar System
Chapter: [17] Star and Solar System
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Which of the following is not a greenhouse gas?

[18] Pollution of Air and Water
Chapter: [18] Pollution of Air and Water
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Describe the Greenhouse Effect in your own words.

[18] Pollution of Air and Water
Chapter: [18] Pollution of Air and Water
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Prepare a brief speech on global warming. You have to deliver the speech in your class.

[18] Pollution of Air and Water
Chapter: [18] Pollution of Air and Water
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Coal tar is a mixture of various substances.

[3] Coal and Petroleum
Chapter: [3] Coal and Petroleum
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