Test Details

Periodic Test

Light

Oct 30, 7:00 PM

40 minutes

Oct 30, 7:40 PM

40.0 marks

MCQ

24 questions

pratibha

B.ed /M.Sc

Class Details

Biology

Class10

Biology

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Question Text

Question 1 :
A concave mirror of focal length $f$ (in air) is immersed in water $(\mu=4/3).$ The focal length of the mirror in water will be

Question 2 :
$ \dfrac{\sin i}{\sin r}  =$constant, the value of constant depends upon a) Pair of media b) Color of incident light c) Wave length d) Refracting nature of material

Question 3 :
When a drop of oil is spread on a water surface, it displays beautiful colours in daylight because of :

Question 4 :
Which of the following mirrors forms an image which is virtual and smaller in size?

Question 5 :
State whether true or falseA convex mirror is used for obtaining a real and magnified image.

Question 9 :
A virtual image larger than the object can be produced by a

Question 10 :
For an object at infinity, a concave mirror produces an image at its focus which is :

Question 11 :
A student obtained a sharp inverted image of a distant tree on a screen placed in front of the concave mirror. He then removed the screen and tried to look into the mirror. He would now see:

Question 12 :
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 13 :
A convex lens has focal length $30$cm. If an object is placed at a distance of $15$cm from it then the magnification produced by the lens is?

Question 14 :
A beam of red light ($7000$ A.U. in air) in passing from air into a medium making an angle of incidence of $61^o$ and angle of refraction of $34^o$. find the wavelength of red light in the medium.

Question 15 :
An object is placed at a distance of 1.5 m from a screen and a convex lens is interposed between them. The magnification produced is 4. The focal length of the lens is then

Question 16 :
Identify the power of the lens in increasing order for the following cases 1) lens of focal length 10 cm 2) lens of focal length 10 m 3) lens of focal length 2 m 4) lens of focal length 50 m

Question 18 :
The relation among u, v and f for a mirror is

Question 19 :
Two thin lenses, when in contact, produce a combination of power$+10D$. When they are $0.25m$ apart, the power reduces to $+6D$. The focal lengths of the lenses (in m) are

Question 21 :
A light ray travels from optically denser medium to optically rarer medium, if the angle of incidence and refraction at point of incidence are $\angle i$ and $\angle r$ respectively, then find the angle of deviation in terms of $\angle i$ and $\angle r$.

Question 22 :
A convex lens produces a double size real image when an object is placed at a distance of $18$ cm from it. Where should the object be placed to produce a triple size real image?

Question 23 :
A flim projector magnifies a flim of area $100 $ square centimeter on screen. If linear magnification is $4$ then area of magnified image on screen will be-

Question 24 :
A small object of linear dimension $x$ lies on the axis of an optical mirror of local length $f$ at a distance $a$ from mirror. The linear dimension of image:

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