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WorksheetsCLASS 10TH CHAPTER LIGHT
Total questions: 47
Worksheet time: 26mins
Which of the following substances cannot be used to make a lens?
Water
Glass
Plastic
Clay
If the power of a convex lens is 1 diopter, what is the focal length of that lens?
+ 10 cm
– 10 cm
– 100 cm
+100 cm
How many laws of refraction of light are there?
1
2
3
4
How many laws of reflection of light are there?
1
2
3
4
What is the value of the refractive index of a medium?
sini/sinr
sinr/sini
sinixsinr
sini+sinr
An convex lens is
Of uniform thickness everywhere
Thicker at the edges than in the middle
Thicker in the middle than at the edges
None of these
What is used in a solar cooker?
Concave mirror
Convex mirror
Plane mirror
Both convex and concave mirrors
The focal length of a convex lens submerged in water is
greater
less
remains unchanged
none of these
Which lens would you prefer when reading small letters found in a dictionary?
Convex lens with a focal length of 50 cm
Concave lens with a focal length of 50 cm
Convex lens with a focal length of 5 cm
Concave lens with a focal length of 5 cm
Example of light wave
(a)
Which lens would you prefer?
Convex lens with a focal length of 50 cm
Concave lens with a focal length of 50 cm
Convex lens with a focal length of 5 cm ✔️
Concave lens with a focal length of 5 cm
Example of light wave
Sound wave
Electromagnetic wave ✔️
Ultraviolet wave
None of these
Light rays travel in
straight lines ✔️
curved lines
any direction
none of these
What is the minimum speed of light?
In vacuum
In water
In air
In glass ✔️
What is always in front of the driver of a motor vehicle?
Flat mirror
Convex mirror ✔️
Concave mirror
Convex lens
What is used in the headlight of a motor car?
Plane mirror
Convex mirror
Concave mirror ✔️
Convex lens
The image formed by a plane mirror is
Real
Virtual ✔️
Both
None of these
Which mirror does a dentist use to see a large reflection of the patient's teeth?
Plane mirror
Concave mirror ✔️
Convex mirror
All of these
Which lens is also called a concave lens?
Which mirror does a dentist use to see a larger reflection of the patient's teeth?
Plane mirror
Concave mirror
Convex mirror
All of these
Which lens is also called a concave lens?
Plane lens
Concave lens
Convex lens
All of these
The diameter of the circular boundary line of the reflective surface of a spherical mirror is called
Principal focus
Radius of curvature
Principal axis
Diameter of the spherical mirror
Which of the following is the focal length of a convex mirror with a radius of curvature of 32 cm?
+8 cm
-8 cm
+16 cm
-16 cm
What is the SI unit of magnification produced by a lens?
m
cm
Dimensionless
None
Which mirror is used in torches and vehicle headlights?
Concave mirror
Convex mirror
Plane mirror
All of these
Which mirror is used in the side mirrors (rearview mirrors) of vehicles?
Concave mirror
Convex mirror
Plane mirror
All of these
How many foci are there in a lens?
Two
Three
One
Two or three
The SI unit of lens power is
Diopter
Angstrom
Lumen
Lux
How many foci are there in a lens?
Two
Three
One
Two or three
The SI unit of lens power is
Diopter
Angstrom
Lumen
Lux
What will be the nature of the image formed when an object is placed in front of a concave mirror?
Virtual
Real
Real or Virtual
None
In which medium does light travel the fastest?
Glass
Water
Iron
Vacuum
Where should the object be placed in front of a concave mirror so that the image formed is inverted, real, and of the same size?
At the pole
At infinity
At the center of curvature
At the focus
The reason the water in the pond appears less deep is
Reflection
Refraction
Deflection
Polarization
What are the diagrams that show the path of light rays called?
Ray diagram
Focus
Ray bundle
None of these
What is the focal length of a 2D lens?
20 cm
30 cm
40 cm
50 cm
What is the capacity of a convex lens?
Negative
Positive
Both A and B
None of these
What is the power of a concave lens?
Negative
Positive
Both A and B
None of these
What is the capacity of a convex lens?
Negative
Positive ✔️
Both A and B
None of these
What is the power of a concave lens?
Negative ✔️
Positive
Both A and B
None of these
Which of the following substances cannot be used to make a lens?
Water
Glass
Plastic
Clay ✔️
When a ray of light enters from air into glass, it bends
Away from the normal
Near the normal ✔️
Parallel to the normal
None of these
Which of the following has the highest refractive index?
Air
Ice
Glass
Diamond ✔️
What is the refractive index of alcohol?
1.33
1.36 ✔️
1.65
1.58
The ratio of the height of the image to the height of the object is called-
Magnification ✔️
Enhancement
Augmentation
None
What type of reflection is formed on the cinema screen?
Real reflection ✔️
Virtual reflection
Both
None
A stick placed in water appears bent. The reason for this is
Refraction ✔️
Reflection
Both
None
