Q. Black-hole is -
1) a flight recorder in aeroplane
2) a spot on the sun
3) a place in Antarctica
4) a collapsed star
Q. Which one of the following is associated with 'Albedo'?
1) Transmitting power
2) Absorbing power
3) Emissive power
4) Reflecting power
Q. The phenomenon used in optical fibre for transmission of light energy is -
1) Total internal reflection
2) Diffraction
3) Scattering
4) Refraction
Q. A liquid remains hot or cold for a long time in thermos flask because there is no loss or gain of heat by -
1) Conduction
2) Convection and radiation
3) Both (A) and (B)
4) None of the above
Q. The unit of electric power is -
1) ampere
2) volt
3) coulomb
4) watt
Q. The device to measure electric current is -
1) voltmeter
2) ammeter
3) voltameter
4) Potentiometer
Q. What is measured in Hertz?
1) Frequency
2) Energy
3) Heat
4) Quality
Q. Sound wave in air is -
1) transverse
2) longitudinal
3) electromagnetic
4) polarized
Q. Which one of the following quantities does not have unit?
1) Stress
2) Force
3) Strain
4) Pressure
Q. Which one of the following is a scalar quantity?
1) Force
2) Pressure
3) Velocity
4) Acceleration
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