41
Colour in a colour television is produced by a combination of three basic colours, they are
A)
Red, Blue and Orange
B)
Red, Green and Blue
C)
Red, Yellow and Green
D)
Red, Green and Brown
Answer & Solution
Answer: Option
B
42
Spherical mirror with reflective surface curved outwards. It is called:
A)
ordinary mirror
B)
concave mirror
C)
convex mirror
D)
plane mirror
Answer & Solution
Answer: Option
C
43
If the angle of incidence of a concave mirror is 30°, what will be the value of the angle of reflection?
A)
15°
B)
30°
C)
60°
D)
90°
Answer & Solution
Answer: Option
B
44
In a magnifying glass . . . . . . . . lens is used.
A)
Convex
B)
Concave
C)
Plano concave
D)
Plano convex
Answer & Solution
Answer: Option
A
45
The lens of the eye is behind the
A)
pupil
B)
vitreous humor
C)
retina
D)
optic nerve
Answer & Solution
Answer: Option
A
46
Which one of the following combinations of aperture and shutter speed of a camera will allow the maximum exposure?
A)
f-22, 1/60
B)
f-16, 1/125
C)
f-8, 1/250
D)
f-5.6, 1/1000
Answer & Solution
Answer: Option
A
47
Astronauts see the sky . . . . . . . . from spacecraft.
A)
black
B)
blue
C)
orange
D)
red
Answer & Solution
Answer: Option
A
48
When a CD (Compact disc used in audio and video systems) is seen in Sunlight, rainbow-like colours is seen. This can be explained on the basis of the phenomenon of
A)
Reflection and diffraction
B)
Reflection and transmission
C)
Diffraction and transmission
D)
Refraction, diffraction and transmission
Answer & Solution
Answer: Option
A
49
A star appears twinkling in the sky because of
A)
scattering of light by atmosphere
B)
reflection of light by atmosphere
C)
refraction of light by atmosphere
D)
diffraction of light by atmosphere
Answer & Solution
Answer: Option
C
50
Which can divide the sun's light into its constituent colors?
A)
refraction
B)
reflection
C)
prism
D)
radiation
Answer & Solution
Answer: Option
C
