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Decibel is the unit used for:
- ✘ Speed of light
- ✘ Intensity of heat
- ✔ Intensity of sound
- ✘ Radio wave frequency
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‘Short sight ‘ in human eye can be corrected by using proper:
- ✔ Concave lens
- ✘ Convex lens
- ✘ Cylindrical lens
- ✘ Bifocal lens
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Pycnometer is an instrument used to measure the :
- ✘ Intensity of heat
- ✔ Density
- ✘ Intensity of earthquake
- ✘ High temperature
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What is viewed through an electron microscope?
- ✘ Electrons and other particles
- ✔ Structure of bacteria and viruses
- ✘ Inside of human stomach
- ✘ Inside of human eye
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Who invented the laser?
- ✘ Sir Frank Whittle
- ✘ Fred Morrisson
- ✔ Theodore H. Maiman
- ✘ Dr. Charles H Jones
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Speed of sound is greatest in
- ✘ Water
- ✘ Air
- ✔ Glass
- ✘ Glycerin
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Which of the following is a nonrenewable source of energy ?
- ✘ Biogas
- ✘ Solar
- ✘ Wind
- ✔ Coal
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A fountain pen works on the principle of :
- ✘ Flow of liquids from higher to lower potential
- ✔ Capillary action
- ✘ Bernoulli’s principle
- ✘ Viscosity of liquids
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Which is the weakest force in nature?
- ✘ weak force
- ✔ gravity
- ✘ strong force
- ✘ electromagnetic force
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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
