Question 1. Red light is used in traffic signals because ?
(A) It has the longest wavelength
(B) It is visible to people even with bad eyesight
(C) It is beautiful
(D) None of the above
Question 2. The Sky appears blue due to ?
(A) Red light is ultimately absorbed by atmosphere
(B) Blue light is minimum absorbed by atmosphere
(C) The red colour is scattered most
(D) Blue colour is scattered most
Question 3. Sky is blue because ?
(A) Atmosphere absorbs long wavelength more than short wavelength
(B) Blue colour is more absorbing to eyes
(C) Short waves are scattered more than long waves by atmosphere
(D) Blue colour in the Sunlight is more than other colours
Question 4. Red light signal is used as a danger signal because ?
(A) It is least absorbed in air
(B) It produces least chemical reaction
(C) This is comfortable for eyes
(D) Red light is scattered least
Question 5. Blue colour of the sky is due to_______.
(A) Emission of more blue light as compared to other colours by the Sun
(B) Interference of light
(C) Dispersion of light
(D) Scattering of light
Question 6. The Sun appears red during Sunset________.
(A) Diffraction of light
(B) Refraction of light
(C) Scattering of light
(D) Reflection of light
Question 7. The red colour of the Sun at Sunset and Sunrise is due to__________.
(A) Dispersion of light
(B) Total internal reflection of light
(C) Refraction of light
(D) Scattering of light
Question 8. An astronaut sees the colour of the sky as________.
(A) Red
(B) Black
(C) White
(D) Blue
Question 9. When we see the sky from a plane in high altitude, then it seems________.
(A) Red
(B) White
(C) Black
(D) Blue
Question 10. Sea seems blue due to_________?
(A) Upper layer of water
(B) Blue colour of water
(C) Reflection of sky and scattering of light by the drops of water
(D) Excess deepness
Question 11. Photosynthesis using the invisible part of the Sunlight is done by some ?
(A) Fungi
(B) Bacteria
(C) Algae
(D) Trees
Question 12. The Sun and the Moon appear elliptical near the horizon because of ?
(A) Their actual shape
(B) Interference phenomenon
(C) Optical illusion
(D) Refraction
Question 13. The Sun is visible to us a few minutes before the actual sunrise because of ?
(A) Refraction of light
(B) Total internal reflection of light
(C) Diffraction of light
(D) Scattering of light
Question 14. Which one among the following has the highest energy?
(A) Yellow light
(B) Red light
(C) Green light
(D) Blue light
Question 15. In the visible spectrum, the colour having the shortest wavelength is________.
(A) Violet
(B) Blue
(C) Yellow
(D) Red
Question 16. Which one of the colours has the longest wavelength?
(A) Red
(B) Blue
(C) Yellow
(D) Green
Question 17. The colour of light is determined by its ?
(A) Velocity
(B) Intensity
(C) Wavelength
(D) Amplitude
Question 18. For the myopic eye, the defect is cured by ?
(A) Toric lens
(B) Cylindrical lens
(C) Concave lens
(D) Convex lens
Question 19. Diffusion of light in the atmosphere takes place due to ?
(A) Water vapours
(B) Helium
(C) Dust particles
(D) Carbon dioxide
Question 20. The colour of the star is an indication of its ?
(A) Distance from the Sun
(B) Luminosity
(C) Temperature
(D) Distance from the Earth
Question 21. Direct viewing of Sun during total solar eclipse causes irreversible damage to eyes. The retinal burn is caused by which one of the following components of the Sun rays?
(A) Infra-red light
(B) Ultra-violet light
(C) Rainbow light
(D) Heat
Question 22. The principle reason why it is better to have two eyes than one is that ?
(A) It enhances distance and depth perception in us
(B) It gives a man a type of vision known as mosaic vision
(C) By having two eyes we can easily see in the dark as well in dim light
(D) By having two eyes we can distinguish colour easily
Question 23. Which type of image of an object is formed by eye lens of the retina?
(A) Inverted and Virtual
(B) Inverted and Real
(C) Erect and Virtual
(D) Erect and Real
Question 24. The image formed on Retina is ?
(A) Equal to object but straight
(B) Smaller than object but inverted
(C) Smaller than object but straight
(D) Equal to object but inverted
Question 25. The technique used to transmit auto signals in television broadcasts is ?
(A) Time Division Multiplexing
(B) Pulse Code Modulation
(C) Frequency Modulation
(D) Amplitude Modulation
Question 26. Television signals cannot be received beyond a certain distance because ?
(A) The surface of the Earth is curved
(B) Air absorbs signals
(C) Antenna is weak
(D) Signals are weak
Question 27. When a CD (Compact disc used in audio and video systems) is seen in Sunlight, rainbow-like colours is seen. This can be explained on the basis of the phenomenon of ?
(A) Refraction, diffraction and transmission
(B) Diffraction and transmission
(C) Reflection and transmission
(D) Reflection and diffraction
Question 28. For reproducing sound, a CD (Compact Disc) audio player uses a ?
(A) Barium titanic ceramic
(B) Laser beam
(C) Titanium needle
(D) Quartz crystal
Question 29. ‘Raman effect’ deals with the light rays passing through ?
(A) Only fluids
(B) Only diamonds
(C) Only prisms
(D) All transparent medium
Question 30. The generating images on a screen by focusing an electronic beam on phosphorus coated screen is called ?
(A) Radar Scan
(B) Roster Scan
(C) Total Scan
(D) Master Scan