Light, Shadows and Reflections

The following are the sources of light.
(i) A glow worm
(ii) An electric bulb
(iii) The stars
Which of the given sources emit light naturally?
1. Only (i) and (ii)
2. Only (ii) and (iii)
3. Only (i) and (iii)
4. All the three
Identify translucent objects given in the box.
(i) Ground glass
(ii) Ice
(iii) Wood
1. Only (i) and (ii)
2. Only (ii) and (iii)
3. Only (i) and (iii)
4. All the three
How does light travel?
1. Rectilinear propagation
2. Random motion
3. Curvilinear motion
4. Circular motion
Why does an opaque object form a shadow when placed in the path of light?
1. Because light gets reflected
2. Because the opaque object does not allow light to pass through it
3. Because the opaque object acts as a source of light
4. Because light is a form of energy
Which of the following are non-luminous bodies?
(i) A planet
(ii) A star
(iii) A metal strip
(iv) A burning candle
1. Only (i) and (ii)
2. Only (ii) and (iii)
3. Only (i) and (iii)
4. Only (ii) and (iv)
Which of the following allows light to pass through it easily?
1. A metal plate
2. A glass tumbler
3. A book
4. A wooden block
Which of the following reflects light the most?
1. A mirror
2. A piece of paper
3. A cloth
4. A wooden table
What happens when light falls on a wooden chair?
1. A part of the light reflected from the chair enters our eyes.
2. Light passes through the wooden chair.
3. The chair sends a signal to our eyes that enables us to see it.
4. Electrical energy is given out by the chair.
Objects which do not allow light to pass through them are called
1. transparent
2. translucent
3. opaque
4. all the above
A shadow is
1. black in colour
2. red in colour
3. colour of the object
4. none of these
A highly polished furniture acts like a
1. pinhole camera
2. mirror
3. lens
4. transparent object
An image has
1. the colour of the object
2. black colour
3. no colour at all
4. all the above
Shadow is formed on the screen
1. in front of the object
2. behind the object
3. does not sustain
4. none of the above
The nature of the size of the shadow depends on
1. size of the source of light
2. size of the object
3. distance between the source of light an object
4. all of them
A torch is shone onto a star-shaped card which forms a shadow on the screen behind the card. What will happen to the shadow if the torch is moved away from the card?
1. It decreases in size.
2. It increases in size.
3. It first becomes smaller and then again becomes larger.
4. It changes its shape.
We are able to see the objects around us because
1. the objects absorb all the light.
2. the light reflected from the eyes reaches the object.
3. the light reflected from the objects enters our eyes.
4. light can be refracted.
In the morning, when the sun rises in the east, your shadow will be seen on the
1. east
2. north
3. west
4. south
Which of the following statements about shadows is Incorrect!
1. The shadow of an object is formed on the opposite side of the light source.
2. The position of the shadow changes with the position of the light source.
3. The position of the shadow changes with the movement of the object.
4. A transparent body produces a shadow.
You cannot see the flame of a burning candle by looking through a bent pipe. This is because
1. light gets bent along the pipe.
2. light travels in a straight line.
3. light gets reflected.
4. light gets absorbed.
Which of the following statements is NOT true regarding shadows?
1. A shadow gives only the outline of that object.
2. Shadows are formed due to the blocking of light by an opaque object.
3. Images are similar to shadows.
4. A shadow formed is always on the opposite side of the light source.
The diagram given below shows a shadow formed when light falls on an opaque object. What are the characteristics of the shadow?

(i) It is black in colour.
(ii) It has the same shape as the object.
(iii) It has the same size as the object.
(iv) It has the same colour as that of the object.
1. Only (i) and (ii)
2. Only (ii) and (iii)
3. Only (i) and (iii)
4. Only (ii), (iii) and (iv)
The moon is a non-luminous object but still it is visible to us. Why?
1. The moonlight travels only in the form of rays.
2. The moon reflects the light falling on it from the sun.
3. The moonlight emits visible light.
4. The moonlight travels in curved paths.
We cannot see an object when
(i) it reflects light
(ii) it casts a shadow
(iii) there is no light.
1. Only (i)
2. Only (ii)
3. Only (iii)
4. All the three
Rahul places a candle in front of three cardboards each with a hole on them and observes on the other side. What inference does he make from the given experiment?
1. Light rays are very thin.
2. Light rays travel in straight lines.
3. The eye can only see a luminous body.
4. A beam of light is made up of a lot of light rays.
Which of the following objects does NOT allow light to pass through it?
1. A mirror
2. A glass bottle
3. A piece of tracing paper
4. A piece of clear plastic paper
The length of the shadow of a tree will keep changing with respect to
1. Sun
2. lamp.
3. a distant star
4. torch
Which of the following factors affect the image produced by a pinhole camera?
(i) Enlarging the size of the pinhole
(ii) Increasing the distance between the screen and the pinhole camera.
(iii) Increasing the distances between the object and the pinhole
1. Only (i) and (ii)
2. Only (ii) and (iii)
3. Only (i) and (iii)
4. (i), (ii) and (iii)
Which of the following is a false?
1. Pinhole camera produces an erect image
2. Pinhole Camera produces a shadow
3. Pinhole Camera produces an image
4. Pinhole Camera produces an inverted image
Pinhole camera produces an ?
1. An erect and small image
2. an erect and enlarged image
3. an Inverted and small image
4. An inverted and enlarged image
What is required to create the pinhole camera?
1. Cardboard
2. tracing paper
3. lens
4. mirrors

Light, Shadows and Reflections

Quiz