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CLASS - 10 SCIENCE IMPORTANT QUESTIONS PART - 2 


QUESTION NO. 11 

 Write the name of lens which is called diverging lens. Why it is called diverging.

 ANSWER NO. 11

 Concave lens diverging light rays. Such lenses are called diverging lenses.

 QUESTION NO. 12

 A paper is burnt through a lens. Write the name of lens.

 ANSWER NO. 12

 Convex lens.

 QUESTION NO. 13

 The human eye can focus on object at different distances by adjusting the focal length of the eye lens. This is due to 
(a) Presbyopia
(b) Accommodation
(c) Near - sightedness   
(d) Far - sightedness

 ANSWER NO. 13

 (b) Accommodation

 QUESTION NO. 14

 If the earth had no atmosphere, the sky will look -
(a) Blue
(b) Red 
(c) Yellow 
(d) Dark blue 

 ANSWER NO. 14

 (d) Dark blue

 QUESTION NO. 15

 To the passengers flying in very high altitude the sky will look -
(a)  Red 
(b)  Yellow 
(c)  Pink
(d)  Dark Blue

 ANSWER NO. 15

 (d)  Dark Blue

 QUESTION NO. 16

 Why the ' DANGER ' signals lights are red in colour. 

 ANSWER NO. 16

The red is least scattered by fog or smoke. Thus it can be seen in the same colour from a distance.

 QUESTION NO. 17

 What is spectrum ?

 ANSWER NO. 17 

 The bond of the coloured component of a light beam is called spectrum.

 QUESTION NO. 18 

 What is dispersion ?

 ANSWER NO. 18

 The splitting of light into its component colours is called dispersion.

 QUESTION NO. 19
What does an electric circuit mean.

 ANSWER NO. 19

 A continuous and closed path of an electric current is called an electric circuit.

 QUESTION NO. 20

 Name a device that helps to maintain a potential difference across a conduction.

 ANSWER NO. 20 

 The name of device is voltmeter.


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