MCQ Questions for Class 7 Physics Light Quiz 11

Image formed by plane mirror is

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real and erect
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real and inverted
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virtual and erect
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virtual and inverted

What is the focal length of a plain mirror?

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0
0%
1
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Infinity
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None of these

The image formed by a plane mirror is:

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Erect and diminished
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Erect and enlarged
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Inverted and of same size
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Erect and of same size

All of the following statements are correct except

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The magnification produced by a convex mirror is always less than one
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A virtual, erect, same-sized image can be obtained using a plane mirror
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A virtual, erect, magnified image can be formed using a concave mirror
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A real, inverted, same-sized image can be formed using a convex mirror

A convex lens

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Converges light rays
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Diverges light rays
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Form real images always
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Always forms virtual images

Explanation

A convex lens converges ray of light coming from an object to form a real and inverted image provided object is not located in front of Focal Length(

F

$F$ ) of the lens. If object is located in front of

F

$F$ then image formed is virtual and magnified.

Hence, only option A is correct.

1896723_1824280_ans_ca5ff92669554a7eb941b924568bba99.png

Concave lens is known as convergent lens.

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True
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False

Real images are always inverted.

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True
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False

For a real object, which of the following can produce a real image

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Plane mirror
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Concave lens
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Convex mirror
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Concave mirror

A concave lens always forms a virtual image.

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True
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False

Mark True if the statement is true and False if it is false:
A real image cannot be obtained on a screen.

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True
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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.

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The image is virtual.
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The image is real.
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The image is upright.
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The image is inverted
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None of the above.

Which of the following is not a characteristic of light ?

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Light travels with $3 \times 10^{8}\ ms^{-1}$ speed in vacuum.
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Light is an electromagnetic radiation which produces sensation in our eye
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Light travels on a straight path
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Light is a mechanical wave

Explanation

Light is an electromagnetic radiation which produces sensation in our eye. It travels with a speed of

3 \times 10^{8} m / s

$3 \times 10^{8} \ m/s$ . It always travels in a straight line.

Light waves are not considered as mechanical waves because they don't need medium to travel.

Correct Option is D.

Study the given ray diagrams and select the correct statement from the following:
624567_d3c7d74633904ed489635046e465118a.30-Resize

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Device X is a concave mirror and device Y is a convex lens, whose focal lengths are 20cm and 25cm respectively.
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Device X is a convex lens and device Y is a concave mirror, whose focal lengths are 20cm and 25cm respectively.
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Device X is a concave lens and device Y is a convex mirror, whose focal lengths are 20cm and 25cm respectively.
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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?

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It reflect red colour.
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It allows red colour to pass through.
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It scatters red colour.
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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.

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(i) - Penumbra, (ii) - Darkness, (iii) - Brightness, (iv) - Umbra
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(i) - Penumbra, (ii) - Brightness, (iii) - Darkness, (iv) - Umbra
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(i) - Umbra, (ii) - Darkness, (iii) - Brightness, (iv) - Penumbra
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(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.

The image formed by a plane mirror is:

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Virtual and erect
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Virtual and inverted
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Real and erect
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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?

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The letters get laterally inverted
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The letters get transversely inverted
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The letters remain unchanged
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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:

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a and b
0%
b and c
0%
a and c
0%
All

How many images will be formed if two mirrors are fitted on adjacent wall and one mirror on roof?

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2
0%
5
0%
7
0%
10

Which one of the following does not use concave mirror?

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Magnifire mirror by dentist
0%
Reflector in flashlight
0%
Solar heater
0%
Rear view mirror in cars

If two plane mirrors be kept at an angle of

120^{0}

$120^{0}$ to each other, the number of images of a object, kept between the two mirror is

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$2$
0%
$3$
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$4$
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$5$

Explanation

The number of images formed between two mirrors kept at some angles is given as

n = (\frac{360^{\circ}}{θ}) - 1

$n = \left( {\dfrac{{360^\circ }}{\theta }} \right) - 1$

Where

n

$n$ is the number of images and

θ

$\theta$ is the angle between the mirrors.

Given that the angle between the mirrors is

θ = 120^{\circ}

$\theta = 120^\circ$ , hence

n = (\frac{360^{\circ}}{120^{\circ}}) - 1

$n = \left( {\dfrac{{360^\circ }}{{120^\circ }}} \right) - 1$

n = 3 - 1

$n = 3 - 1$

n = 2

$n = 2$ .

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

$F$ . 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

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Point $A$
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Point $B$
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Point $C$
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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

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$v_A + v_B$
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$|\vec{v_A} + \vec{v_B}|$
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$\sqrt{v_A^2 + v_B^2}$
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$\sqrt{v_A^2 - v_B^2}$

Explanation

As seen from the image, object

B

$B$ and image of

A

$A$ will be on the same line, thus for relative speed between them

V_{B A i} = V_{B} + V_{A}

$V_{BAi}=V_{B}+V_{A}$

977324_1069915_ans_aa0a4bbca3744ab791f5b4b6d5364007.png

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]

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None
0%
1
0%
2
0%
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?

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Read large prints
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Read small prints
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To diverge rays
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As a diverging lens

Which lens is used in a magnifying glass?

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Concave
0%
Convex
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Diverging
0%
Converging

Explanation

In a magnifying glass, a convex lens is used that is also called converging lens, thus options

B&D

$B&D$ are correct.
1989505_1951151_ans_5d3b6b34663f4d139524a6aef89f32d8.png

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

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Practice Class 7 Physics Quiz Questions and Answers

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

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Practice Class 7 Physics Quiz Questions and Answers

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