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Physics

Physics
Which of the following is indicated by the colour of a star ?

Weight
Temperature
Distance
Size

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Physics
Mach number is used in connection with the speed of

spacecraft
sound
aircraft
ships

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Physics
Choose the most appropriate answer: Sir CV Raman was awarded Noble Prize for his work connected with which of the following phenomenon of radiation?

Polarization
Scattering
Interference
Diffraction

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Physics
Copper wires are generally used for electrical power transmission instead of iron wire because :

Copper can take higher power than iron
Copper is lighter than iron
Copper is cheaper than iron
Copper is a better conductor of electricity than iron

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Physics
Rectifiers are used to convert:

Alternating current to Direct current
Direct current to Alternating current
Low voltage to high voltage
High voltage to low voltage

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Physics
What device converts light energy to electrical energy?

Photovoltaic cell
Heliostats
Photodiode
Thermocouple

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