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• Four identical bulbs each rated 100 watt, 220 volts are connected across a battery as shown. The total electric power consumed by the bulbs is: A. 75 wattB. 400 wattC. 300 wattD. 400/3 watt
• The characteristic X-ray radiation is emitted whenA. the bombarding electrons knock out electrons from the inner shell of the target atoms and one of the outer electrons falls into this vacancyB. the valance electrons are removed from the target atoms as a result of the collisionC. the source of electrons emits a mono energetic beanD. the electrons are accelerated to a fixed energy
• Statement-1: Television signals are received through skywave propagation. Statement-2: The ionosphere reflects electromagnetic waves of frequencies greater than a certain critical requency.A. Statement-1 is true, Statement-2: is true, Statement-2 is a correct explanation for Statement-1.B. Statement-1 is true, Statement-2: is true, Statement-2 is NOT a correct explanation for Statement-1.C. Statement-1 is true but statement-2 is falseD. Statement-1 is false, Statement-2 is true