Class 10 Human Eye And Colourful World CBSE Questions & Answers

Class 10 · Human Eye And Colourful World

Class 10 Human Eye and Colourful World CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
The far point of a healthy person is
  • A
    0.15m
  • B
    100m.
  • C
    15cm
  • D
    Infinity
    Correct
2
A ray of light travelling in air fall obliquely on the surface of a calm pond. It will-
  • A
    Go into water without deviating from its path
    Correct
  • B
    Deviate towards the normal
  • C
    Deviate away from the normal.
  • D
    Turn back on its original path.
3
The human eye forms the image of an object at its
  • A
    Iris
  • B
    Retina
    Correct
  • C
    Cornea
  • D
    Pupil
4
The far point of a myopic person is 80cm in front of the eye. Which type of lens is required to correct the problem?
  • A
    Bifocal
  • B
    Concave
    Correct
  • C
    Plane lens
  • D
    Convex
5
What Colour we obtain on mixing red green blue?
  • A
    Cyan
  • B
    Black
  • C
    Magenta
  • D
    White
    Correct
6
The refractive indices of three media P, Q, R, are 1.73, 1.33 and 2.24 respectively. Arrange these media in increasing order of their optical density.
  • A
    R, Q, P
  • B
    Q, P, R
  • C
    Q, R, P
    Correct
  • D
    P, Q, R
7
The inability among the elderly to see nearby objects clearly because of the weaking of the ciliary muscles is called-
  • A
    Near-sightedness
  • B
    Far sightedness
  • C
    Myopia
  • D
    Presbyopia
    Correct
8
Light waves are
  • A
    electrical waves
  • B
    Electromagnetic waves
    Correct
  • C
    None of these
  • D
    Mechanical waves
9
The muscles of the iris control the
  • A
    Opening of the pupil
    Correct
  • B
    Shape of the crystalline lens
  • C
    Focal length of the eye-lens
  • D
    Optic nerve
10
At what rate the event should be projected to have the clear image?
  • A
    24 frames per second
    Correct
  • B
    22 frames per second
  • C
    20 frames per second
  • D
    25 frames per second
11
What is the least distance for clear vision in old age?
  • A
    about 1 to 2 m
    Correct
  • B
    about 50cm
  • C
    about 2to3m
  • D
    about 25cm
12
The values of f and u for a concave lens are always
  • A
    None of these
  • B
    Negative
  • C
    Positive
    Correct
  • D
    Sometimes negative sometimes positive
13
The angle through which a ray of light turns on passing through a prism is called-
  • A
    Angle of deviation.
    Correct
  • B
    Angle of incidence
  • C
    Angle of reflection
  • D
    Angle of emergence
14
How long does the light from an event stay in our eye?
  • A
    None of these
  • B
    \({{{1^{th}}} \over {10}}\) of a second
  • C
    \({{{1^{th}}} \over {24}}\) of a second
  • D
    \({\rm{1}}/{\rm{1}}{{\rm{6}}^{{\rm{th}}}}\) of a second
    Correct
15
When do we say a person is colour blind?
  • A
    All of these
  • B
    When person cannot differentiate between colours
    Correct
  • C
    When person cannot see in the light
  • D
    When person cannot see in the dark