Test Details

Light

Feb 08, 6:10 PM

60 minutes

Feb 09, 7:10 PM

50.0 marks

MCQ

30 questions

Ravi shankar pandey sir

B.tech (IIT Dhanbad). ex faculty of Allen, Rao, fiitjee.

Class Details

Maths

8th

Maths

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Question Text

Question 1 :
Mark the WRONG statement: When two plane mirrors are placed parallel to each other:

Question 3 :
The least distance of distinct vision for a young adult with normal vision is about:

Question 5 :
Plane mirrors are arranged parallel to each other to get :

Question 6 :
Choose the proper food from following, to keep our eyes healthy:

Question 7 :
Assertion: When an object is placed between two plane parallel mirrors, then all the images found are of equal intensity. Reason: In case of plane parallel mirrors, only two images are possible.

Question 8 :
Two plane mirrors are set at right angle and a flower is placed in between the mirrors. The number of images of the flower which will be seen is:

Question 9 :
There is a pattern observed in the number of sum spots appearing every year called as

Question 11 :
Assertion: Dispersion of light occurs because velocity of light in a material depends upon its colour. Reason: The dispersive power depends only upon the material of the prism, not upon the refracting angle of the prism.

Question 12 :
Assertion: Different colours travel with different speed in vacuum. Reason : Wavelength of light depends on refractive index of medium.

Question 13 :
Which of the following colour of light undergoes the maximum deviation while passing a glass prism ?

Question 14 :
Far point of a person is $5 m$. In order that he has normal vision what kind of spectacles should be use

Question 15 :
Due to which property of colours they appear differently though the sunlight is passed through only one medium?

Question 16 :
Fill in the blanks:The phenomenon of splitting of light into its component colours is ____________

Question 17 :
The phenomenon of splitting of light into its component colours is _________.

Question 18 :
When light passes through a medium that consists of scatters such as water vapour, dust particles, which colour of light experiences highest scattering?

Question 19 :
State whether the following statement is True or False.  You can see a rainbow only when your back is towards the sun

Question 20 :
A white screen illuminated by green and red light appears to be

Question 21 :
A short pulse of white light is incident from air to a glass slab at normal incidence. After traveling through the slab, the first colour to emerge is

Question 22 :
Which of the following scientists did the pioneering work to understand the splitting of white light in different components ?

Question 23 :
Assertion: A ray of white light shows no dispersion on emerging from a glass slab although dispersion occurs inside the glass slab. Reason: The velocity of light inside the glass slab is same for all different colours.

Question 24 :
In spectrum obtained with prism which color is deviated maximum ?

Question 25 :
Which of the following colours of light undergoes the least deviation while passing through a glass prism ?

Question 26 :
What causes difference in velocity of colours while passing from one medium to another through glass prism?

Question 28 :
In the spectrum of white light which color is deviated minimum ?

Question 29 :
Assertion : If a plane glass slab is placed on the letters of different colours all the letters appears to be raised up to the same height. Reason : Different colours have different wavelengths.

Question 30 :
Which of the following statements is correct regarding the propagation of light of different colors of white light in air?

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