Download 2 Marks Questions

II – Term Question Bank [2016-2017]
Subject:- Physics
Standard:-X
1 Mark Questions:1) State the two laws of reflection of light.
2) Refractive index of two materials medium are 13 and 15 respectively. In which of the two the
light would travel faster?
3) Give the mirror image of ambulance
4) What is the range of vision of normal human eye?
5) State one function of Iris in human eye
6) Give an example of phenomenon where tyndall effect is observed
7) State one function of crystalline lens in human eye
8) What will be the colour of the sky when it is observed from space?
9) What is the wavelength range of visible light?
10) The radius of curvature of a spherical mirror is 25cm what is the focal length?
11) What do you understand by the term power of accommodation?
12) Which phenomenon is used in cinematography?
13) Why do chicken wakeup early and sleep early?
14) What kind of mirrors are used in the cars as rear view mirror?
2 Marks Questions:1) The refractive index of diamond is 2.47 and the speed of the light is 3x10`8 m/s. Calculate the
speed of light in diamond.
2) What are the minimum number of rays required for locating the image formed by concave a
mirror for an object. Draw ray diagram to show the formation of a virtual image by a concave
mirror.
3) The power of lens is -2.5 D. What is the focal length and nature of lens?
4) Draw a labeled ray diagram to illustrate the dispersion of a narrow beam of white light when it
passes through a glass prism
5) Define refractive index of a transparent medium . What is its unit? Which has a higher refractive
index glass or a water?
6) Name the type of mirror used in following situation:i)Headlight of a car.
ii)Solar furnace.
iii)Shaving mirror.
7) Define power of lens. What is the SI unit of a power of a lens. If power of a lens is +2D. What is
the nature and focal length of a lens?
8) Why is the colour of the clear sky blue?
9) What are the factors affecting refractive index of a air?
10) What is meant by power of accommodation of eye? How is it related to the focal length of the
eye lens?
11) A star sometimes appear brighter and some other times fainter. What is this effect called? State
the reason for this effect
12) What is scattering of light? Give factors also.
13) Cataract is common old age disease Why does it occur? How can it be rectified?
14) Why does an object appears to flickers when viewed through smoke above chulah?
3 Marks Questions:1) Draw a ray diagram to show refraction of light through a glass prism. Mark on it (a) the incident
ray (b) the emergent ray and (c) the angle of deviation.
2) Explain the formation of rainbow in the sky with the help of a diagram.
3) What is meant by dispersion of light. Draw a diagram to show dispersion of white light by the
glass prism.
4) Give reason:- i) The extent of a deviation of a ray light on passing through a glass prism depends
on its colour.
ii) Light of red colour is used for danger signal.
5)
6)
7)
8)
9)
10)
11)
12)
What do you understand by myopia? What causes it? How can it be rectified?
How can a hypermetropia eye be treated? What are main causes of it? Give its remedy?
For which position of the object does a convex lens form a virtual and erect image? Explain.
How can you differentiate between plane, convex and concave mirror without touching them?
What is understood by lateral displacement of light? Illustrate it with the help of a diagram.
How to increase the magnification and sharpness of the image in optical instruments?
What is meant by lateral displacement of light?
Draw a ray diagram to show the path of the refracted ray in each of the following cases:-A ray of
light incident on a concave lens is (a) passing through its optical centre. (b) parallel to its principal
axis. (c) directed towards its principal focus.
5 Marks Questions:1) How far will a light beam travel? If there was an extremely strong light beam that could be
seen from miles, were would the light stop? If the flash light has low batteries, how far will its
light beam travel?
2) Light of wavelength of 500nm in air, enter a glass plate of refractive index 1.5. (i) speed (ii)
frequency and (iii) wavelength of light in glass. Assume that the frequency of light remains
the same in both medium?
3) Draw a ray diagram showing the image formation by a concave mirror when an object is
placed:- (a) between pole and focus of the mirror. (b) between focus and centre of curvature
of the mirror. (c) at centre of curvature of the mirror. (d) a little beyond centre of curvature
of the mirror. (e) at infinity.
4) List the new Cartesian sign convention for reflection of light by spherical mirror. Draw a
diagram and apply these conventions for calculating the focal length and nature of the
spherical mirror which forms a 1/3 lines magnified virtual image of an object placed 18cm in
front of it.
5) Draw a ray diagram showing the image formation by a convex lens when an object is placed:(a) between optical centre and focus of the lens. (b) between focus and twice the focal length
of the lens. (c) at twice the focal length of the lens. (d) at infinity. (e) at the focus of the lens.
6) Draw a neat labeled diagram of human eye and explain the working of each part of it.
7) (a) What is dispersion of white light? What is the causes of such dispersion? Draw a diagram
to show the dispersion of white light by a glass prism.
(b) A glass prism is able to produce a spectrum when white light passes through it but a glass
slab does not produce any spectrum. Explain why it is so?
8) What eye defect is hypermetropia? Describe with a ray diagram how this defect of vision can
Be corrected by using an appropriate lens.
9) Name the three common defects of vision. What are their causes? Name the type of lens
used to correct each of them.
10) What eye defect is myopia. Describe with a neat diagram how this defect of vision can be
corrected by using a suitable lens.