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  1. Decibel is the unit used for:
    • ✘ Speed of light
    • ✘ Intensity of heat
    • ✔ Intensity of sound
    • ✘ Radio wave frequency
  2. ‘Short sight ‘ in human eye can be corrected by using proper:
    • ✔ Concave lens
    • ✘ Convex lens
    • ✘ Cylindrical lens
    • ✘ Bifocal lens
  3. Pycnometer is an instrument used to measure the :
    • ✘ Intensity of heat
    • ✔ Density
    • ✘ Intensity of earthquake
    • ✘ High temperature
  4. What is viewed through an electron microscope?
    • ✘ Electrons and other particles
    • ✔ Structure of bacteria and viruses
    • ✘ Inside of human stomach
    • ✘ Inside of human eye
  5. Who invented the laser?
    • ✘ Sir Frank Whittle
    • ✘ Fred Morrisson
    • ✔ Theodore H. Maiman
    • ✘ Dr. Charles H Jones
  6. Speed of sound is greatest in
    • ✘ Water
    • ✘ Air
    • ✔ Glass
    • ✘ Glycerin
  7. Which of the following is a nonrenewable source of energy ?
    • ✘ Biogas
    • ✘ Solar
    • ✘ Wind
    • ✔ Coal
  8. A fountain pen works on the principle of :
    • ✘ Flow of liquids from higher to lower potential
    • ✔ Capillary action
    • ✘ Bernoulli’s principle
    • ✘ Viscosity of liquids
  9. Which is the weakest force in nature?
    • ✘ weak force
    • ✔ gravity
    • ✘ strong force
    • ✘ electromagnetic force
  10. What is the phenomenon of Raman scattering, named after Indian physicist C.V. Raman?
    • ✘ effects of cloud layers on radio emissions
    • ✔ change of wavelength of deflected light
    • ✘ statistical distribution of meteorite impacts
    • ✘ motion of atoms in ionized gas