Q. A rainbow is produced due to which one of the following phenomena?
1) Dispersion of light
2) Interference of light
3) Diffraction of light
4) Scattering of light by atmospheric dust
Q. The statement that heat cannot flow by itself from a body at a lower temperature to a body at a higher temperature, is know as -
1) Zeroth law of thermodynamics
2) First law of thermodynamics
3) Second law of thermodynamics
4) Third law of thermodynamics
Q. Which one of the following waves does not belong to the category of the other three?
1) X-rays
2) Microwaves
3) Radiowaves
4) Sound waves
Q. Which one of the following statements is not correct ?
1) Ultrasonic waves cannot get reflected, refracted or absorbed
2) Ultrasonic waves are used to detect the presence of defects like cracks, porosity, etc. in the internal structure of common structure materials
3) Ultrasonic waves can be used for making holes in very hard materials like diamond
4) Ultrasonic waves cannot travel through vacuum
Q. Light year is a measure of -
1) time
2) distance
3) total amount of light falling on the Earth in a year
4) average intensity of light falling on the Earth in a year
Q. Water boils at a lower temperature at high altitudes, because -
1) the air pressure is less
2) outside temperature is less
3) latent heat is less
4) None of the above
Q. The majority charge carriers in a p-type semiconductor are -
1) free electrons
2) conduction electrons
3) ions
4) holes
Q. Five bulbs each of 100 watt capacity in a tunnel are illuminated continuously for twenty hours. The consumption of electricity will be-
1) One unit
2) Two units
3) Ten units
4) Twenty units
Q. A cut diamond shines brilliantly due to-
1) some inherent property
2) total internal reflection
3) its molecular structure
4) absorption of light
Q. Which one of the following pairs is not correctly matched?
1) Light year - Unit of distance
2) Parsec - Unit of time
3) Decibel - Unit of sound intensity
4) Hertz - Unit of frequency
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