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Weekly Quiz Competition

Question 1
1 / -0

In which mirror is the image formed always virtual?

a. Plane mirror
b. Convex mirror
c. Concave mirror

A
Only a

B
Only b

C
Only c

D
a and b

Solution

Both a plane mirrors and a convex mirror, always form a virtual image.The image formed by a plane mirror appears to be behind the plane in which the mirror lies, thus, the image is virtual. Convex mirror is known as a diverging mirror as in this mirror, light diverges when it strikes on its reflecting surface.These rays seem to meet behind the mirror, thus, the image formed by it is virtual.
Question 2
1 / -0

When an object is kept between the focus and the pole, the image formed by a concave mirror is _________.

A
real, inverted and of the same size

B
real, inverted and smaller in size

C
virtual, erect and magnified

D
real, inverted and magnified

Solution

When the object is kept between the focus and the pole, the image formed by a concave mirror is virtual, erect and magnified.
Question 3
1 / -0

For maximum utility, the bulb of a car's headlight should be kept

A
beyond the centre of curvature

B
at focus

C
between the focus and the pole

D
between the centre of curvature and the focus

Solution

In a car's headlight, the bulb is placed at the focus so that a highly enlarged image is obtained at the infinity.
Question 4
1 / -0

What are the characteristics of the image formed at the retina?

A
Real, smaller and erect

B
Real, magnified and erect

C
Smaller, real and upside down

D
Magnified, real and upside down

Solution

The characteristics of the image formed at the retina are that the image formed is smaller, real and upside down. It is further processed in the brain.
Question 5
1 / -0

When a mirror is rotated through an angle of 30 degrees, with what angle would the reflected ray turn?

A
90 degrees

B
15 degrees

C
30 degrees

D
60 degrees

Solution

When a mirror is rotated through an angle of 30 degrees, the reflected ray would turn by two times the angle of rotation of the mirror i.e. 30x2= 60 degrees.
Question 6
1 / -0

In a plane mirror, if an object moves by a distance 'x', then what is the distance moved by the image with respect to the object?

A
2x

B
x

C
x/2

D
x²

Solution

In case of a plane mirror, the distance of the image is always equal to the distance of the object from the mirror.If an object moves a distance 'x' towards the mirror, then the distance moved by the image towards the mirror is 'x'. Hence, the relative separation of the image and the object decreases by 2x or it can be said that the distance moved by the image with respect to the object is 2x.If an object moves a distance 'x' away the mirror, then the distance moved by the image away from the mirror is 'x'. Hence, the relative separation of the image and the object increases by 2x or it can be said that the distance moved by the image with respect to the object is 2x.
Question 7
1 / -0

In a concave mirror, all the rays parallel to the principal axis converge at which point?

A
Centre of curvature

B
Focus

C
Pole

D
Between the pole and the focus

Solution

In a concave mirror, all the rays parallel to the principal axis converge at the focus.
Question 8
1 / -0

A concave mirror is used everywhere except in a

A
dentist mirror

B
shaving mirror

C
torch

D
rear view mirror

Solution

A convex mirror is used in the rear view mirror because it forms an erect, virtual, and diminished image which allows the driver to view a large area in a small mirror.
Question 9
1 / -0

Which colour is absent in the spectrum formed by a cut diamond?

A
Violet

B
Purple

C
Blue

D
Indigo

Solution

Purple colour is not present in the spectrum.
Question 10
1 / -0

The outer curved surface of a spoon acts as a ___________.

A
concave mirror

B
convex mirror

C
plane mirror

D
convex lens

Solution

The outer curved surface of a spoon acts as a convex mirror.
Question 11
1 / -0

Which of the following equation gives the correct relation between the focus (F) and the centre of curvature (C)?

A
F = 2C

B
F = 1/2 C

C
F = C

D
C = 1/2 F

Solution

F is related to C by F = 1/2 C, it means that the focus is half the length of the centre of curvature (C) from the pole.

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Re-Attempt Weekly Quiz Competition

Light Test - 7

Result

Light Test - 7

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SHARING IS CARING

Question 1

Only a

Only b

Only c

a and b

Solution

Question 2

real, inverted and of the same size

real, inverted and smaller in size

virtual, erect and magnified

real, inverted and magnified

Solution

Question 3

beyond the centre of curvature

at focus

between the focus and the pole

between the centre of curvature and the focus

Solution

Question 4

Real, smaller and erect

Real, magnified and erect

Smaller, real and upside down

Magnified, real and upside down

Solution

Question 5

90 degrees

15 degrees

30 degrees

60 degrees

Solution

Question 6

2x

x

x/2

x2

Solution

Question 7

Centre of curvature

Focus

Pole

Between the pole and the focus

Solution

Question 8

dentist mirror

shaving mirror

torch

rear view mirror

Solution

Question 9

Violet

Purple

Blue

Indigo

Solution

Question 10

concave mirror

convex mirror

plane mirror

convex lens

Solution

Question 11

F = 2C

F = 1/2 C

F = C

C = 1/2 F

Solution

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