Q.1
Some people use my lenses to work recording other people, landscapes and objects.Who am I?
  • Camera
  • Binoculars
  • Glasses
Q.2
Some people like using me to enjoy a Safari in Africa, because they can see details of the animals at long distances.Who am I?
  • Camera
  • Binoculars
  • Glasses
Q.3
Through my lenses, people can register and record cultural events.Who am I?
  • Binoculars
  • Telescope
  • Camera
Q.4
I am the instrument used by detectives to see the clues better and to solve the mystery.Who am I?
  • Telescope
  • Microscope
  • Magnifying glass
Q.5
Through my lenses, it is possible to record important moments in people's lives.Who am I?
  • Magniyng glass
  • Binoculars
  • Camera
Q.6
I have lenses that help people to read newspapers, magazines and see well.Who am I?
  • Telescope
  • Glasses
  • Camera
Q.7
My lenses allow us to know the world of microorganisms and many disease-causing agents.Who am I?
  • Microscope
  • Camera
  • Telescope
Q.8
I have a set of lenses that allows scientists to study and observe the Universe and the Galaxy where we live.Who am I?
  • Telescope
  • Binoculars
  • Microscope
Q.9
My lenses protect the eyes by reducing the range of artificial light that is harmful for vision.Who am I?
  • Magnifyng glass
  • Glasses
  • Microscope
Q.10
My lenses help to correct some vision problems that cause headaches, blurred vision and discomfort due to visual effort.Who am I?
  • Glasses
  • Camera
  • Microscope
Q.11
My lenses help to correct some vision problems like myopia, the astigmatism and hyperopia.Who am I?
  • Binoculars
  • Glasses
  • Telescope
Q.12
I have lenses that help children to see better. Who am I?
  • Camera
  • Magnifyng glass
  • Glasses
Q.13
Without my lenses, scientists would never be able to find out about the Sun and the Solar system.Who am I?
  • Camera
  • Magnifyng glass
  • Telescope
Q.14
I am a simple manual optical instrument that students use in Science class to be able to observe small things they don't see well such as insects in the garden. Who am I?
  • Glasses
  • Camera
  • Magnifying glass
Q.15
Some of discoveries made by my lenses were: irregularity of the Moon’s surface and the four largest Jupiter’s moons.Who am I?
  • Telescope
  • Microscope
  • Binoculars
Q.16
Refractive index of material of a prism is √The angle of prism is 60o. What is the angle of minimum deviation?
  • 30o
  • 45o
  • 60o
  • 90o
Q.17
If the critical angle for total internal reflection from a medium to vacuum is 30o, the velocity of light in the medium is
  • 3 X 108 m/s
  • 1.5 X 108 m/s
  • 0.5 X 108 m/s
  • 0.2 X 108 m/s
Q.18
For the same value of angle of incidence, the angles of refraction in three media A, B and C are 15°,andrespectively. In which medium would the velocity of light be minimum?
  • 25°
  • 15°
  • 35°
  • 45°
Q.19
The radius of curvature of the curved surface of a plano-convex lens iscm. If the refractive index of the material of the lens be 1.it will
  • act as a convex lens only for the objects that lie on its curved side.
  • act as a concave lens for the objects that lie on its curved side.
  • act as a convex lens irrespective of the side on which the object lies.
  • act as a concave lens irrespective of side on which the object lies.
Q.20
You are given four sources of light each one providing a light of a single colour – red, blue, green and yellow. Suppose the angle of refraction for a beam of yellow light corresponding to a particular angle of incidence at the interface of two media is 90°. Which of the following statements is correct if the source of yellow light is replaced with that of other lights without changing the angle of incidence?
  • The beam of red light would undergo total internal reflection.
  • The beam of red light would bend towards normal while it gets refracted through the second medium.
  • The beam of blue light would undergo total internal reflection.
  • The beam of green light would bend away from the normal as it gets refracted through the second medium
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