Light - Chapter Wise CBSE Solved Question and Answer Based On NCERT
Very Short Q&A:
Q1: The sense of light is one of the most important _______________
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Senses
Q2: Eyes alone cannot see the objects. True/False.
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True
Q3: Define a mirror.
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A mirror is an shiny or polished object that reflects light or sound in a way that preserves much of its original quality subsequent to its contact with the mirror.
Q4: Define light.
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A form of energy that can be detected by the human eye.
Q5: Define incident ray.
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The light ray which strikes any surface is called the incident ray.
Q6: Which mirror used is used in vehicles?
Plain mirror
concave mirror
Convex mirror
none of the above
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Convex mirror.
Q7: Which property of light is responsible for the occurrence of Rainbows
Reflection
Refraction
Radiation
rectilinear propagation of light.
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Refraction
Q8: Define reflected ray.
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The ray which comes back from the surface after reflection is called reflected ray.
Q9: Define angle of incidence.
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Angle of incidence is a measure of deviation of something from "straight on".
Q10: The angle between normal and incident rays is called the ___________________.
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angle of incidence.
Q11: The angle between normal and reflected rays is called the ___________________.
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angle of reflection.
Q12: Define angle of reflection.
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The angle between normal and reflected rays is called angle of reflection.
Q13: The angle of incidence is always equal to _________________________.
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angle of reflection
Q14: What is the first law of reflection?
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The angle of incidence is always equal to angle of reflection
Q15: What is the second law of reflection?
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Incident rays, reflected rays and normal rays drawn at the point of incidence to the reflecting surface lies in the same plane
Q16: Mita is in front of a plane mirror, in the image formed by mirror her left hand will appear on the________________.
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Right
Q17: Define lateral inversion.
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In an image formed by mirror left of the object appears on the right and the right appears on the left, this property of mirror is called lateral inversion.
Q18: Name the two types of reflection.
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Regular and irregular reflection.
Q19: Define irregular reflection.
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Reflection that place from rough surfaces is called irregular reflection.
Q20: Define regular reflection.
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Regular reflection takes place when light is incident on smooth, polished and regular surfaces.
Q21: What is the colour of sunlight in actual?
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White
Q22: Splitting of light into its colours is called ______________________.
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dispersion of light
Q23: Give an example of dispersion of light.
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Rainbow
Q24: _______________ is the natural phenomenon showing dispersion.
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Rainbow
Q25: Name the dark muscular part of eyes behind the cornea.
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Iris
Q26: Name the small opening in the iris.
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Pupil
Q27: Name the part of eyes which gives it its distinctive colour.
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Iris.
Q28: The ______ controls the amount of light entering the eyes.
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Iris
Q29: In which case do you need to allow more light in the eye, when the light is dim or bright?
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Dim
Q30: The lens of the eyes focuses light on______________.
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Retina
Q31: Name the nerve which helps in the sense of vision.
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Optic nerve
Q32: Which of these form virtual image only?
Concave mirror
Concave mirror
Concave lens
Convex lens
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Convex mirror
Q33: What kind of Image is formed by a concave mirror?
Virtual image
Real image
Sometimes real sometimes virtual
None of the above
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Sometimes real sometimes virtual
Q34: Cones are sensitive to dark light. True/False.
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False
Q35: At which part of eyes there is no sense of vision?
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At the junction of optic nerve and the retina there is no sensory cells, so there is no sense of vision.
Q36: Visually challenged persons can read and write by using _______________.
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Braille system.
Q37: Too little or too much light is good for eyes. True/False
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False
Q38: Which property of light helps in formation of shadows
Reflection
Refraction
Radiation
Rectilinear propagation of light
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Rectilinear propagation of light
Q39: The size of the pupil becomes _______________ when we see in dim light.
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Large
Q40: Angle of incidence is equal to the angle of reflection
