11.LIGHT AND SHADOWS
I. choose the correct answer(1M)
1.Pin
hole camera can be used to image
(A) All opaque objects.
(B) Sun and brightly lit objects.
(C) All types of objects.
(D) None of these
2.Butter
paper is an example of:
(A) Translucent object
(B) Transparent object
(C) Opaque object
(D) All of the above are right
3.If
we can see through an object partially, then it is __________ in nature.
(A) Transparent.
(B) Transluscent.
(C) Both (a) and (b) are correct.
(D) Opaque
4.If
we can see through an object clearly, then it is _________.
(A) Transparent
(B) Transluscent
(C) Opaque
(D) None of the above
5.Objects
that emit light of their own are called:
(A) Non-Luminous objects.
(B) Luminous objects.
(C) Radiant objects.
(D) None of the above
6.Iron
sheet is an example of _______.
(A) Transparent object
(B) Translucent object
7.reflection
(A) Mirror.
gives us clear images.
(B) Platinum.
(C) Opaque object
(C) Gold.
(D) None of the above
(D) One can use any one of them
8.are
formed when an opaque object comes in the path of light.
(A) Matter
(B) Waves
(C) Sound
(D) Shadows
9.Opaque
objects do not allow ________ to pass through them.
(A) Energy
(B) Light
(C) Both (a) and (b).
(D) None of the above
10.Light
is source of ________.
(A) Energy
(B) Air
(C) Pressure
(D) Matter
11.Light
always travels along ________.
(A) Non linear fashion
(B) Straight line
predict
(C) Circular path
(D) Can't
12.A
clear shadow in sunlight can be formed only by:
(A) Opaque object
(B) Transparent Object
(C) Translucent object
(D) None of the above
13.Match
the items of column A with those of column B:
Column A
Column B
I.Moon
A. Transparent
II. Wood
B. Non-luminous
III. Glass
C. Luminous
IV. Sun
D. Opaque object
(A) I-B, II-D, III-A, IV-C
(B) I-B, II-C, III-D, IV-A
(C) I-C, II-B, III-A, IV-D
(D) I-B, II-A, III-C, IV-D
14.A
pin hole camera is based on(A) Straight propagation of light.
(C) Both (a) and (b).
(B) Curved propagation of light
(D) None of these.
20.If
we cannot see through an object at all, it is
(A) Luminous object. (B) Transparent object. (C) Opaque object.
(D) Non luminous object
21.Find
the odd one out.
(A) The moon.
(B) Fire-fly.
(C) The sun.
(D) Tube light.
22.Direction
of light can be changed by using a
(A) Pin hole camera. (B) A translucent object.
(C) A mirror.
(D) An opaque object
23.The
image formed by a mirror is due to(A) Reflection.
(B) Refraction.
(C) Both (a) and (b).
(D) None of these.
24.The
requirement to form a shadow is(A) A source of light. (B) An opaque object.
(C) A screen behind the object. (D) All the above.
25.The
shape of shadow depends on the(A) Size of the object.
(B) Shape of the object.
(C) Shape of the source of light.
(D) Position of the source of light.
26.Which
of the following is a non- luminous body?
(A) The stars.
(B) The Earth.
(C) The Sun.
27.We
(D) A glowing electric bulb.
can see objects because:
(A) The light from a luminous object falls on them and then travels towards our eyes.
(B) Light comes to our eyes.
(C) The object stops the light.
(D) All the three statements are correct
28.Shadow
is formed when light is made to fall on-
(A) A transparent object.
(C) An opaque object.
(B) A translucent object.
(D) None of these.
29.The
changing of path of light by using a mirror is known as
(A) Reflection of light.
(B) Eclipse.
(C) Scattering of light.
(D) All of these
30.In
a pinhole camera, we get an upside down image where as in case of mirrors we see(A) Left side as the right side and the right side as the left side.
(B) Objects as they are.
(C) Upside down reflections.
(D) Backside of the object
31.Is
it possible to see the reflection of your face in a mirror placed in a darkroom?
(A) Yes
(B) No
(C) Sometimes
(D) May be
32.Which
of the following statement is false?
(A) Black thick paper is translucent.
(B) The shadow of an object in sunlight is shortest at noon.
(C) The sun is a natural source of light. (D) Light forms shadow of the opaque objects.
33.We
may see small circular patches of light under a tree because:
(A) There are circular gaps between the leaves of the tree.(B) Gaps between the leaves act as pin holes.
(C) Both (a) and (b).
(D) None of the above
34.We
need ____________ to see a shadow.
(A) Source of light.
(B) Source of light and an opaque object.
(C) Any object.
(D) Source of light, opaque object and a screen
35.If
an object allows light to pass through it, then it is called
(A) Luminous object.
(B) Transparent object.
(C) Non opaque object.
(D) Non luminous object
36.Translucent
objects are those objects
(A) Through which we can see clearly.
(C) Through which we cannot see.
(B) Through which we can see but not clearly.
(D) Which do not allow the light to pass through them
37.Shadows
are formed when ________ object comes in the path of light.
(A) Luminous
(B) Transparent
(C) Opaque
(D) Non luminous
38.Pin
hole camera shows the objects:
(A) Erect
(B) Upside down
(C) Only circular
(D) All of these
39.Formation
of shadows or pin hole images is possible because of the fact that
(A) Nature plays magic.
(B) Scientists have invented them.
(C) Light travels in a straight line.
(D) Light manages to pass through the objects
40.Find
the odd one out(A) The fire-fly.
(B) The stars.
(C) The sun.
(D) Burning candles
41.The
object which doesn't allow light to pass through it is called (A) Transparent.
(B) Opaque.
(C) Translucent.
(D) None of these.
42.Which
of the following is a transparent object?
(A) Rubber sheet.
(B) Moon.
(C) Grounded glass pane.
(D) Water.
II. Answer the following questions.(1M)
15.What
are artificial sources of light?
16.What
are translucent materials?
17.What
is light?
18.What
are transparent materials?
19.Whatis
an opaque material?
III. Answer the following questions.(2M)
43.In
a completely dark room , if you hold a mirror , will you see a reflection of yourself in the mirror?
44.What
is reflection of light?
45.What
is meant by a luminous body? Give examples
46.What
is the nature of the image formed by a pin hole camera? Give reason
47.What are luminous objects?
48.What are opaque objects?
49.What are translucent objects?
50.What is a shadow?
IV. Answer the following questions.(3M)
51.Name
three artificial and natural sources of light?
52.Why empty cardboard cartons act as a dark room?
53.Why do we need to classify objects into different classes?
54.Why are shadows formed?
55.why do opaque object form dark shadows?
V. Answer the following questions.(5M)
56.Show an experiment which proves that light
57.How
always travel in a straight line.
is a pin hole camera made?
58.Differentiate
between a shadow and an image
59.Suggest
an activity to show that light travelling along straight lines will get reflected from a mirror in a
similar way.
60.What are umbra and penumbra?
61.What is a pin hole camera ?
62.What type of image is formed in a pin hole camera?
63.Describe how will you make a pin hole camera?