Q. What is represented by the product of force with displacement in the direction of force?
1) Work
2) Momentum
3) Impulse
4) Power
Q. When light passes from one medium into another, it suffers a change in -
1) Frequency, wavelength, and speed
2) Frequency and speed
3) Wavelength and speed
4) None of the above
Q. Which is the smallest possible unit of a chemical compound?
1) Atom
2) Molecule
3) Proton
4) Photon
Q. Combustion of the candle is a/an -
1) Exothermic reaction
2) Photochemical reaction
3) Physical change
4) Endothermic reaction
Q. Light energy is converted into chemical energy by -
1) Electrolysis
2) Respiration
3) Transpiration
4) Photosynthesis
Q. The most commonly used semi-conductive material is -
1) Germanium
2) Silicon
3) Carbon
4) Sulphur
Q. What should be the characteristics of an electric-fuse wire?
1) High melting point, high specific resistance
2) Low melting point, low specific resistance
3) High melting point, low specific resistance
4) Low melting point, high specific resistance
Q. Very High Frequency (VHF) has -
1) shorter wavelengths
2) shortest wavelengths
3) longer wavelengths
4) longest wavelengths
Q. A device that converts chemical energy into electrical energy is called -
1) motor
2) generator
3) battery
4) moving-coil meter
Q. An elastic wave generated by an impulse such as an earthquake or an explosion is called -
1) sound wave
2) epicentre
3) tectonic shift
4) seismic wave