51
The colour of an opaque object is due to the colour it
A)
Absorbs
B)
Refracts
C)
Reflects
D)
Scatters
Answer & Solution
Answer: Option
C
A)
actual size of specimen/observed size
B)
observed size of specimen/actual size
C)
actual size of specimen-observed size
D)
observed size of specimen actual size
Answer & Solution
Answer: Option
B
53
When we see the sky from a plane in high altitude, then it seems
A)
Blue
B)
Black
C)
White
D)
Red
Answer & Solution
Answer: Option
B
54
Rainbow is produced when Sunlight falls on drops of rain, which of the following physical phenomena are responsible for this?
A)
Only 1 and 2
B)
Only 2 and 3
C)
Only 1 and 3
D)
1, 2 and 3
Answer & Solution
Answer: Option
D
55
Which colour of light shows maximum deviation when passed through a prism?
A)
White
B)
Red
C)
Violet
D)
Green
Answer & Solution
Answer: Option
C
56
Light rays move in straight lines. But through an optical fibre, they can move in any type of zig-zag path because
A)
the holes through the fibres are extremely fine
B)
light rays are absorbed at the entry end and relieved at the exit end of the fibre
C)
scattering of light occurs inside the fibre
D)
successive total internal reflections occur as a ray moves through the fibre
Answer & Solution
Answer: Option
D
57
Red is used as an emergency or danger signal as
A)
it is a striking colour
B)
wavelength is the longest
C)
it is scattered
D)
it has very high energy
Answer & Solution
Answer: Option
B
58
When light passes from one medium to another medium, which one of the following does not change?
A)
Intensity
B)
Velocity
C)
Wavelength
D)
Frequency
Answer & Solution
Answer: Option
D
59
The formation of glittering colours in thin foam of soap is the result of which of the following phenomenon?
A)
Total reflection and interference
B)
Total refraction and dispersion
C)
Diffraction and dispersion
D)
Polarization and interference
Answer & Solution
Answer: Option
A
60
The primary colours in photography are
A)
red, blue, yellow
B)
red, yellow, green
C)
red, blue, green
D)
red, green, cyan
Answer & Solution
Answer: Option
C
