Physics GK Questions - Set 03 - ObjectiveBooks

Physics GK Questions - Set 03

G.K. Practice Test: Question Set - 03


1. RADAR is used for
    (A) Locating submerged submarines
    (B) Receiving a signals in a radio receiver
    (C) Locating geostationary satellites
    (D) Detecting and locating the position of objects such as aeroplanes

2. Stars twinkle because
    (A) The intensity of light emitted by them changes with time
    (B) The distance of the stars from the earth changes with time
    (C) The refractive index of the different layers of the earth's atmosphere changes continuously, consequently the position of the image of a start changes with time
    (D) The light from the star is scattered by the dust particles and air molecules in the earth's atmosphere

3. Sound travels with a different speed in media. In what order does the velocity of sound increase in these media?
    (A) Water, iron and air
    (B) Iron, air and water
    (C) Air, water and iron
    (D) Iron, water and air

4. Light travels at the fastest speed in
    (A) Glass
    (B) Water
    (C) Hydrogen
    (D) Vacuum

5. Light Emitting Diodes (LED) is used in fancy electronic devices such as toys emit
    (A) X-rays
    (B) Ultraviolet light
    (C) Visible light
    (D) Radio waves

6. Supersonic plane fly with the speed
    (A) Less than the speed of sound
    (B) Of sound
    (C) Greater than the speed of sound
    (D) Of light

7. Primary rainbow is formed when light suffers
    (A) Two internal refractions before emerging out of the drop
    (B) One internal refractions before emerging out of the drop
    (C) No internal refraction
    (D) Either one or two internal refractions before emerging out of the drop

8. Rainbow is produced when sunlight fall on drops of rain. Which of the following physical phenomena are responsible for this?
    I. Diffusion
    II. Refraction
    III. Internal reflection
    (A) I, II and III
    (B) I and II
    (C) II and III
    (D) I and III

9. Rain is falling vertically downwards. To a man running east-wards, the rain will appear to be coming from
    (A) East
    (B) West
    (C) Northeast
    (D) Southeast

10. Planets are
    (A) Luminous heavenly bodies revolving around a star
    (B) Non-luminous heavenly bodies
    (C) Luminous heavenly bodies that twinkle
    (D) Luminous heavenly bodies that do not twinkle

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