CBSE Questions for Class 7 Physics Light Quiz 9 - MCQExams.com

Choose the mirror image of the word above:
635931_1b56ba6dd92f47c585418c120d3e0bb2.png
  • 1
  • 2
  • 3
  • 4
Incident light falling on a surface is sent back into the same medium. This phenomenon is known as
  • Dispersion
  • Reflection
  • Refraction
  • Polarization
A candle can not be seen through a bent pipe. This shows that 
  • Light reflects when incident on a surface
  • Light does not reflect when incident on a surface
  • Light does not travel in a straight line
  • Light travels in a straight line
State whether true or false.
A real image cannot be obtained on a screen.
  • True
  • False
What do you mean by "Rectilinear Propagation" of Light ?
  • Light travels in a straight line
  • Light travels in a curved path
  • Light exhibits dual nature of particle and wave
  • Light gets deviated when it moves in another medium
Rajesh conducts the following experiment. 
He cuts $$3$$ cardboard pieces, each with a hole in the center, and aligns them in a straight line as shown in the image. He now puts a candle in front of the first cardboard piece and looks at it from behind the third piece. He is able to see the candle. He puts the third cardboard piece aside and now tries to look at the candle. But this time, he is not able to see it.

What can be concluded from this experiment?
637161_38338f17e04b4141a3f07db914e60493.png
  • The visibility of the candle depends on the position of the candle with respect to Rajesh
  • The visibility of candle depends on the position of Rajesh
  • The visibility of candle depends on the relative alignment of $$3$$ cardboards
  • The candle is visible only when the $$3$$ cardboards are in a line because light from the candle travels only in a straight line, to reach Rajesh's eyes.
State whether true or false.
A concave mirror always forms a real image.
  • True
  • False
Convex lens
  • Shrinks the image
  • Magnifies the image
  • Sharpens the image
  • Increase the contrast of the image
The image of the teeth seen by a dentist while testing teeth is 
  • Erect and real
  • Erect and virtual
  • Inverted and virtual
  • Inverted and real
Image formed by plane mirror is:
  • Virtual 
  • Real
  • Magnified
  • None of these
The number of capital letters such as A, B, C, D which are not laterally inverted by a plane mirror?
  • 6
  • 7
  • 11
  • 13
The observer  ________see the candle because light always takes _______ path.
904060_3ca3cd716f9643279eb3464142d6e139.png
  • Can, straight line
  • Can, curved
  • Cannot, straight line
  • Cannot, curved
Three light bulbs are concealed from an observer by an opaque wall as shown. Without shifting the positions of the observer and the bulbs, the images of which of the bulbs can the observer see from the plane mirror? 
768240_030b400ce3d14f70a962ead6aa7247fa.png
  • P and R
  • P and Q
  • Only P
  • Q and R
Which of the following forms a virtual and erect image for all positions of the object ?
  • Concave lens
  • Concave mirror
  • Convex mirror
  • Both (a) and (c)
Shadow of an object is produced, when it is placed in the path of light ray, because
  • Light contains material particles
  • Light travel very fast
  • Light rays travel in straight lines
  • Light rays are electromagnetic in nature
A small object is 10 cm in front of a plane mirror. A man stands 30 cm from the mirror behind the object and looks at the object's image. He should focus his eyes to see the image at a distance of ___ from himself. (Fill in the blank)
  • 25 cm
  • 35 cm
  • 45 cm
  • 40 cm
The mirror which is used for side view in vehicles is 
798764_c1e4d5fb85534ab7aa57d5d6675fae01.png
  • Plane mirror
  • Concave mirror
  • Convex mirror
  • None of these
The image of an object formed by a device is always virtual and small. The device may be 
  • A glass plate
  • A concave mirror
  • A convex lens
  • A concave lens
Which type of an image is formed by a plane mirror?
  • Real & inverted
  • Real & erect
  • Virtual & erect
  • Virtual & inverted
A person has a $$18$$cm wide face and his two eyes are separated by 8 cm.Find the minimum width of a mirror required for the person to view is face laterally is
  • $$9$$cm
  • $$4$$cm
  • $$5$$cm
  • $$13$$cm
The diameter of the sun subtends an angle of $$ 0.5^0 $$ at the surface of the earth. A converging lens of focal length $$100 \ cm$$ is used to provide an image of the sun on a screen. The diameter ( in mm) of the image formed is nearly 
  • $$1$$
  • $$3$$
  • $$5$$
  • $$8.7$$
The image formed by a convex mirror of a real object is
  • virtual and erect
  • virtual and inverted
  • real and erect
  • real and inverted
Which diagram best shows the reflection of light?
An object is at a distance of $$0.5$$ m in front of a plane mirror. The distance between the object and the image is
  • $$0.5 m$$
  • $$1 m$$
  • $$0.25 m$$
  • $$1.5 m$$
While capturing solar energy for commercial purposes we use 
  • Parabolic mirrors
  • Plane mirrors
  • Convex mirrors
  • Concave mirrors

The passenger side-view mirror on an automobile often has notation. "Objects seen in the mirror are closer than they appear". Is the image really farther away than the object? 
  • Yes, the image is smaller and farther away than the object.
  • Yes, the image is larger and farther away than the object.
  • No, the image is larger and closer than the object.
  • No, the image is smaller and closer than object.

In which of the following cases we cannot get a virtual image using a plane mirror ?
The reflection that occurs when a beam of light falls on a smooth surface is called irregular reflection.
  • True
  • False
 The time in a clock is $$8: 40: 10$$. The time in the image of the clock formed by the plane mirror is 
  • $$8 : 40 : 10$$
  • $$8 : 50 : 30$$
  • $$3 : 19 : 50$$
  • None of these
Which surface will  reflect most of the light falling on them ?
  • Rough surface
  • Shining surface
  • Smooth surface
  • Opaque surface
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