Test Details

Physics

Onra

Oct 28, 9:15 PM

100 minutes

Oct 28, 10:55 PM

30.0 marks

MCQ

25 questions

Mr. Adarsh Tiwari

MSc ( Physics )

Class Details

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Question Text

Question 1 :
If a $$3cm$$ tall object placed perpendicular to principal axis of a convex lens of focal length $$15cm$$ produces a real invented image of height $$15cm$$, then its object distance $$(u)$$ is ................ and image distance $$(v)$$ is ................

Question 2 :
Where should the object be placed in front of a concave mirror so that the image formed is of the same size as the object?

Question 3 :
Which of the below is one of the laws of refraction?<br>

Question 4 :
If an object is placed at '$$C$$' of a concave mirror, the position of the image is ______

Question 5 :
A beam of light passing from air enters into the glass. Identify which of the following statements is true?<br/>

Question 6 :
If in a plano-convex lens, the radius of curvature of the convex surface is 10 cm and the focal length of the lens is 30 cm, then the refractive index of the material of lens will be

Question 7 :
The value of the focal length of the lens is equal to the value of the image distance when the rays are

Question 8 :
During refraction through a glass block, the angle of refraction _______.

Question 11 :
An under-water swimmer cannot see very clearly even in absolutely clear water because of:

Question 12 :
A convex and a concave lens separated by distance $$d$$ are then put in contact. The focal length of the combination

Question 13 :
Assertion: A beam of white light gives a spectrum on passing through a hollow prism. Reason: Speed of light outside the prism is different from the speed of light inside the prism.

Question 14 :
Which of the following observations cannot be explained by Tyndall Effect?

Question 15 :
Long-sightedness is caused by the eyeball being too short. It can be corrected by the use of a :

Question 18 :
The color of scattered light depends on ____ of the scattering particles.

Question 21 :
The danger signals installed at the top of tall buildings are red in colour. These can be easily seen from a distance because among all other colours, the red light:<br/>

Question 23 :
Assertion: The setting sun appears to be red. Reason: Scattering of light is directly proportional to the wavelength.

Question 24 :
Assertion: Bluish colour predominates in a clear sky, since blue has a shorter wavelength and is scattered strongly. Reason: Blue has the shortest wavelength among all colours.

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