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Get Ready for the Assertion Reason Quiz !

Passing percentage = 60%

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Assertion Reason

Topic - Colourful World

 

These consist of two statements - Assertion (A) and Reason (R). Answer these questions selecting the appropriate options given below:

(a) Both A and R are true and R is the correct explanation of A.

(b) Both A and R are true but R is not the correct explanation of A.

(c) A is true but R is false.

(d) A is false but R is true.

 

1 / 10

 

Assertion-Stars twinkle while planets do not twinkle. 

Reason- Stars are very far away so they are considered point sources whereas planets are near to us so they are taken as extended sources. 

 

2 / 10

 

Assertion- Stars appears lower than they actually are. 

Reason- The light coming from the stars suffers atmospheric refraction before reaching our eyes.

 

3 / 10

 

Assertion- Blue colour of the sky appears due to maximum scattering of blue colour of white light. 

Reason- Blue colour has the shortest wavelength in the white light. 

 

4 / 10

 

Assertion : A beam of white light produces spectrum on passing through a glass prism in a dark room.

Reason : Different colours of white light travel with same speed inside the glass prism.

 

5 / 10

 

Assertion : There is no dispersion of white light when light passes through a glass slab in a brightly lit room

Reason : Dispersion of light is splitting up of light into its constituent colours.

 

6 / 10

 

Assertion – Danger signals are made of red colour.

Reason – Speed of red light is maximum in air so red reaches the observer’s eye fastest even in dark.

 

7 / 10

 

Assertion – The sky looks dark and black instead of blue in outer space.

Reason – There is no atmosphere containing air in the outer space to scatter sunlight.

 

8 / 10

 

Assertion : Stars twinkle while planets do not twinkle.

Reason :  Stars are much bigger in size than planet.

 

9 / 10

 

Assertion -  Rainbow is an example of the dispersion of sunlight by water droplets.

Reason : Light of shorter wavelength is scattered more than the light of longer wavelength.

 

10 / 10

 

Assertion : The light of violet colour deviates the most and the light of red colour the least while passing through a prism.

Reason : For a prism material, refractive index is highest for the violet colour and lowest for the red colour.

 

The average score is 65%

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