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 .
Q. Which of the following is a natural polymer?
1) Bakelite
2) Cellulose
3) PVC
4) Nylon
Q. Radio telescopes are better than optical telescopes because -
1) They can detect faint galaxies which cannot be done by optical telescopes.
2) They an work even in cloudy conditions.
3) They can work during the day and night.
4) All of the above .
Q. Light year is a unit of -
1) time
2) distance
3) light
4) intensity of light
Q. A transformer is used to -
1) increase A.C. voltage.
2) increase D.C. voltage.
3) Convert electrical energy to heat energy.
4) convert A.C. energy to D.C. energy .
Q. What is the most suitable unit to measure the distance of any star?
1) Coulomb
2) Nautical Mile
3) Light year
4) Amperes
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