Test Details

Light

Class7

Oct 23, 7:00 PM

25 minutes

Oct 23, 7:25 PM

40.0 marks

MCQ

18 questions

Shahid Hussain

Adaptive and blank

Class Details

Science &Maths

Class 8&7

Science &Maths

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Question Text

Question 2 :
Why do we study the Dispersion phenomenon using a glass prism and not a glass slab ?

Question 4 :
A virtual image larger than the object can be produced by a

Question 5 :
A part of sphere is cut and polished on both sides. One object is kept on each side of mirror. Is it possible for the twoimages to overlap?

Question 6 :
A point object is placed in front of a plane mirror. If the object and the mirror start moving away from each other with speed v along a straight line, then speed of the image with respect to mirror is

Question 7 :
Assertion: All the materials always have the same colour, whether viewed by reflected light or through transmitted light. Reason: The colour of material does not depend on nature of material.

Question 8 :
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 9 :
The locus of a point which moves so that its distance from x-axis is double of its distance from y-axis is

Question 10 :
Write true or false for each statement<br>The speed of light is more in glass than in water.

Question 11 :
State whether the following statement is true or false :<br>A diverging mirror is used as a rear-view mirror.

Question 12 :
A clock fixed on a wall shows time $$04:25:37$$. What time will its image in a plane mirror show?

Question 13 :
Assertion: The size of the mirror affect the nature of the image. Reason: Small mirror always forms a virtual image.

Question 14 :
The reflectivity percentage of incident lighton earth is meteorologically called as

Question 15 :
A spherical convex surface separates object and image space of refractive index $$1$$ and $$4/3$$ respectively. If radius of curvature of the surface s $$0.1\ m$$, its power is

Question 16 :
A narrow of white light goes through a slab having parallel faces.

Question 17 :
A concave shaving mirror has a radius of curvature of 35.0 cm. It is positioned so that the (upright) image of a mans face is 2.50 times the size of the face. How far is the mirror from the face?

Question 18 :
A perfectly reflecting mirror has an area of $$1\ cm^{2}$$. Light energy is allowed to fall on it for $$1\ h$$ at the rate of $$10W/ cm^{2}$$. The force that acts on the mirror is:

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