Question

SUB Physical Science
1119
о л дом
CLASS: X
ch. Lahari
1 Blue colour of the sky is due to
5. Human eye and Colourful World - Work Sheet
A) water vapour and Krypton
- molecules present in the atmosphere
El Nitrogen and Oxygen
be least distance of distinct vision for a young adult with normal vision is
B)Carbon dioxide and Carbon monoxide
D) Krypton and Carbon monoxide
A) 20cm
B) 25cm
In case of eye defect called Myopia' image is formed
C) 25m
D) 20m
A) after retina
B) before retina
The colour in the sequence VIBGYOR that has least wavelength is
C) on retina
D) none of the above
A) yellow
B) red
The splitting of white light into different colours is called
C) green
D) violet
A) dispersion
B) scattering
C) refraction
Which of the following molecules in atmosphere are responsible for blue colour of sky?
D) reflection
A) H2, Cl2
B) He, H2
C) CO, SO2
D) N2,02
7. Light is a/an
A) longitudinal wave B) stationary wave
C) electromagnetic wave D) none of the above
3. Which part of human eye is called “Variable aperture”?
A) Retina
B) Cornea
C) Pupil
D) Lens
P. In prism experiment, the i-d curve looks like
A) straight line
D) elipse
B) circle
C) parabola
0. Select the correct statement of the following
A) The least distance of distinct vision at below 10 years age is 7-8cm
B) The least distance of distinct vision in old age is 1m or even more
C) If angle of vision is above 600 then we can see only the part of the object
D) Angle of vision and least distance of distinct vision are same for all persons
1. Which of the following phenomena of light are involved in the formation of a rainbow?
B) Refraction, dispersion and total internal reflection
A) Refraction, dispersion
D) Dispersion, scattering and total internal reflection
C) Reflection, refraction and dispersion
B) to focus the sunlight at a point
2. One of the uses of a concave lens is
A) as eye piece in microscope
C) to correct hypermetropia
D) to correct myopia
. If a person uses a lens of -2.5D powder, then the focal length of the lens is
A) 40cm
B) 50cm
C) -40cm
D) -50cm​

Answer 1

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