CBSE Questions for Class 7 Physics Light Quiz 11 - MCQExams.com

Image formed by plane mirror is
  • real and erect
  • real and inverted
  • virtual and erect
  • virtual and inverted
What is the focal length of a plain mirror?
  • 0
  • 1
  • Infinity
  • None of these
The image formed by a plane mirror is: 
  • Erect and diminished
  • Erect and enlarged
  • Inverted and of same size
  • Erect and of same size
All of the following statements are correct except 
  • The magnification produced by a convex mirror is always less than one
  • A virtual, erect, same-sized image can be obtained using a plane mirror
  • A virtual, erect, magnified image can be formed using a concave mirror
  • A real, inverted, same-sized image can be formed using a convex mirror
A convex lens
  • Converges light rays
  • Diverges light rays
  • Form real images always
  • Always forms virtual images
Concave lens is known as convergent lens.
  • True
  • False
Real images are always inverted.
  • True
  • False
For a real object, which of the following can produce a real image  
  • Plane mirror
  • Concave lens
  • Convex mirror
  • Concave mirror
A concave lens always forms a virtual image.
  • True
  • False
Mark True if the statement is true and False if it is false:
A real image cannot be obtained on a screen.
  • True
  • False
An object, represented by a gray arrow, is placed in front of a plane mirror. Which of the diagrams in below Figure correctly describes the image, represented by the pink arrow?
When an image of an object is formed by a plane mirror, which of the following statements is always true? More than one statement may be correct.
  • The image is virtual.
  • The image is real.
  • The image is upright.
  • The image is inverted
  • None of the above.
Which of the following is not a characteristic of light ?
  • Light travels with $$3 \times 10^{8}\ ms^{-1} $$ speed in vacuum.
  • Light is an electromagnetic radiation which produces sensation in our eye
  • Light travels on a straight path
  • Light is a mechanical wave
Study the given ray diagrams and select the correct statement from the following:
624567_d3c7d74633904ed489635046e465118a.30-Resize
  • Device X is a concave mirror and device Y is a convex lens, whose focal lengths are 20cm and 25cm respectively.
  • Device X is a convex lens and device Y is a concave mirror, whose focal lengths are 20cm and 25cm respectively.
  • Device X is a concave lens and device Y is a convex mirror, whose focal lengths are 20cm and 25cm respectively.
  • Device X is a concave lens and device Y is a concave mirror, whose focal lengths are 20cm and 25cm respectively.
Why does a red coloured object seem to be red?
  • It reflect red colour.
  • It allows red colour to pass through.
  • It scatters red colour.
  • It absorb red colour.
Fill in the blanks with most appropriate option.
Although a number of objects, such as kites, birds, aeroplanes move in space, but their shadow is not seen on earth. This is due to the reason that the  ___(i)____, the region of complete ___(ii)____ is not able to reach the earth. The region of partial  __(iii)___, that is the ___(iv)___ reaching the earth is too large and too faint to be visible to us.
  • (i) - Penumbra, (ii) - Darkness, (iii) - Brightness, (iv) - Umbra
  • (i) - Penumbra, (ii) - Brightness, (iii) - Darkness, (iv) - Umbra
  • (i) - Umbra, (ii) - Darkness, (iii) - Brightness, (iv) - Penumbra
  • (i) - Umbra, (ii) - Brightness, (iii) - Darkness, (iv) - Penumbra
Find the correct mirror image of given combination of letters and numbers if the mirror is placed vertically to the left.
799483_c38c6d25647c43808171a771c42438e3.png
The image formed by a plane mirror is:
  • Virtual and erect
  • Virtual and inverted
  • Real and erect
  • Real and inverted
If you write your name or any other word or sentence on a piece of paper and hold it in front of a plane mirror, how does it appear in the mirror?
  • The letters get laterally inverted
  • The letters get transversely inverted
  • The letters remain unchanged
  • None of the above
Image formed by a plane mirror is
a) of same size as that of object
b) at the same distance behind the mirror as the object in front
c) erect, virtual
Mark the correct statements:
  • a and b
  • b and c
  • a and c
  • All
How many images will be formed if two mirrors are fitted on adjacent wall and one mirror on roof?
  • 2
  • 5
  • 7
  • 10
Which one of the following does not use concave mirror?
  • Magnifire mirror by dentist
  • Reflector in flashlight
  • Solar heater
  • Rear view mirror in cars
If two plane mirrors be kept at an angle of $$ 120^{0}  $$ to each other, the number of images of a  object, kept between the two mirror is 
  • $$2$$
  • $$3$$
  • $$4$$
  • $$5$$
As shown above, an object is placed on the left side of a cpnvex lens(beyond its focus) with its focal points labeled as $$F$$. A flat mirror is placed at the right side focal point, with its reflecting surface facing the lens. The image of the object after refraction and reflection is at 
1301757_fb6ee76983264b4baf8461226f0adb99.PNG
  • Point $$A$$
  • Point $$B$$
  • Point $$C$$
  • Point $$D$$
A student measures the focal length of a convex lens by putting an object pin at a distance 'u' from the lens and measured the distance 'v' of the image pin. The graph between 'u' and 'v' plotted by the student should look like

Two bodies A and B are moving, towards a plane mirror with speeds $$v_A$$  and $$v_B$$ respectively as shown in the figure. The speed of image of A respect to the body B is


1069915_dbafea7f42574377a3176ffd6dd63727.png
  • $$v_A + v_B$$
  • $$|\vec{v_A} + \vec{v_B}|$$
  • $$\sqrt{v_A^2 + v_B^2}$$
  • $$\sqrt{v_A^2 - v_B^2}$$
Two plane mirrors are at right angles to each other. A man stands between them and combs his hair with his right hand. In how many of the images will he be seen using his right hand            
                                         [ MP PMT 1995; UPSEAT 2001]
  • None
  • 1
  • 2
  • 3
The image formation, when rays from a distant object fall on a concave mirror is correctly depicted in the ray diagram and give correct explanation to support your answer.
What is a magnifying glass used for?
  • Read large prints
  • Read small prints
  • To diverge rays
  • As a diverging lens
Which lens is used in a magnifying glass?
  • Concave
  • Convex
  • Diverging
  • Converging
0:0:1


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