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A Nephometer is used to measure:
Which of the following principle is used to produce low-temperatures'?
The substance which conducts current in the solid state is –
The experimental evidence that the electron exhibits wave-like characteristics was first provided by:
Which of the following is the energy quantum of radiation?
The potential inside a charged hollow sphere is __________.
The density of water is maximum at which temperature?
Cathode rays when obstructed by metal cause emission of -