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Free download in PDF Human Eye and Colourful World Objective Type Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
(21)
Two convex lenses of focal length 10cm and 20cm are kept in contact .The focal length of the combination is:
[A]
20/3 cm
[B]
40 cm
[C]
12cm
[D]
15 cm
(22)
The defect of astigmatism can be rectified by using: -
[A]
Convex lens
[B]
Cylindrical lens
[C]
Concave lens
[D]
Bifocal lens
(23)
A student sitting on the last bench can read the letters written on the blackboard but is not able to read the letters written in his text book. Which of the following statements is correct?
[A]
The near point of his eyes has receded away
[B]
The near point of his eyes has come closer to him
[C]
The far point of his eyes has come closer to him
[D]
The far point of his eyes has receded away
Answer: The near point of his eyes has receded away
(24)
Which of the following phenomena of light are involved in the formation of a rainbow?
[A]
Reflection, refraction and dispersion
[B]
Refraction, dispersion and total internal reflection
[C]
Refraction, dispersion and internal reflection
[D]
Dispersion, scattering and total internal reflection
Answer: Refraction, dispersion and internal reflection
(25)
Which of the following statements is correct regarding the propagation of light of different colours of white light in air?
[A]
Red light moves fastest
[B]
Blue light moves faster than green light
[C]
All the colours of the white light move with the same speed
[D]
Yellow light moves with the mean speed as that of the red and the violet light
Answer: All the colours of the white light move with the same speed
(26)
Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or sunset?
[A]
Dispersion of light
[B]
Scattering of light
[C]
Total internal reflection of light
[D]
Reflection of light from the earth
Answer: Scattering of light
(27)
The focal length of the eye lens increases when eye muscles
[A]
are relaxed and lens becomes thinner
[B]
contract and lens becomes thicker
[C]
are relaxed and lens becomes thicker
[D]
contract and lens becomes thinner
Answer: are relaxed and lens becomes thinner
(28)
The image formed by retina of human eye is
[A]
Virtual and erect
[B]
Real and inverted
[C]
Virtual and inverted
[D]
Real and erect
Answer: Real and inverted
(29)
The light sensitive cell present on retina and is sensitive to the intensity of light is:
[A]
Cones
[B]
Rods
[C]
Both rods and cones
[D]
None of these
(30)
The phenomena of light responsible for the working of the human eye is
[A]
Reflection
[B]
Refraction
[C]
Power of accommodation
[D]
Persistence of vision
31
The colored light that refracts most while passing through a prism is
[A]
Yellow
[B]
Violet
[C]
Blue
[D]
Red
32
Splitting of white light into seven colours on passing through the glass prism is called-
[A]
Reflection
[B]
Refraction
[C]
Scattering
[D]
Dispersion
33
For which colour, refractive index of glass is maximum?
[A]
Red
[B]
Violet
[C]
Green
[D]
None of these above
34
Red colour of the sun at the time of sunrise and sunset is because-
[A]
Red colour is least scattered
[B]
Blue colour is least scattered
[C]
Red colour is scattered the most
[D]
All colours are equally scattered
Answer: Red colour is least scattered
35
Cinematography makes use of -
[A]
Accommodation
[B]
Persistence of vision
[C]
Least distance of distinct vision
[D]
Bi-focal lens system
Answer: Persistence of vision
36
The convex lens of focal length 20cm each are separated by a distance of 10cm for focal length of combination is :-
[A]
20cm
[B]
40cm
[C]
30cm
[D]
13.3cm
37
A long-sighted person cannot see clearly:
[A]
Near objects
[B]
Distant objects
[C]
Both distant and near objects
[D]
All of the Above
38
A person cannot see fundamental colours (red, blue, green). This defect is called:-
[A]
Myopia
[B]
Presbyopia
[C]
Colour blindness
[D]
All of the above
39
Two lenses of power –1.75D and +2.75D are placed in contact. The focal length of the combination is :-
[A]
50cm
[B]
100cm
[C]
75cm
[D]
125cm
40
The amount of light entering the human eye is controlled by
[A]
Ciliary muscles
[B]
Pupil
[C]
Cornea
[D]
Iris
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