Q. A triode differs from a diode in the way that -
1) it can amplify a signal
2) it has a vacuum inside
3) it has a heated cathode
4) the photoelectric effect causes it's current
Q. The element of an electric stove is made of -
1) copper
2) aluminium
3) magnalium
4) nicrome
Q. Which of the following sounds cannot be heard by the human ear?
1) 300 vibrations/sec
2) 1,000 vibrations/sec
3) 10,000 vibration/sec
4) 30,000 vibrations/sec
Q. A photo-electric cell converts -
1) Sound energy into electrical energy
2) Light energy into electrical energy
3) An electrical signal into sound waves
4) Electrical energy into light energy
Q. Gold and copper happen to absorb ......... and violet light, leaving yellow light.
1) green
2) blue
3) red
4) orange
Q. Which of the following is a process in which hot, less dense materials rise upward and are replaced by colder, more dense materials?
1) Conduction
2) Radiation
3) Condensation
4) Convection
Q. Electron-volt is a unit of -
1) energy
2) power
3) current
4) potential difference
Q. Speed is indicated in -
1) Kilometer/second
2) Centimeter / hour
3) Newton
4) Kilometer/hour
Q. Temperature inversion is -
1) Positive lapse rate
2) Negative lapse rate
3) Neutral condition
4) None of these
Q. The heat of a reaction does not depend on -
1) temperature of the reaction.
2) the path by which the final product is obtained.
3) Physical state of the reactants and products
4) Whether the reaction is carried out at constant pressure or at constant volume .
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