In a photocell light energy is converted into
1). potential energy
2). chemical energy
3). heat energy
4). electrical energy
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1. For which of the following substances, the resistance decreases with increase in temperature?
2. A microscope used in pathological laboratories forms
4. Which among the following types of coal produces most heat per unit?
5. The waveform of a certain signal can be studied by
6. The weakest of all fundamental forces is
7. Device used for the detection and measurement of all types of radiation (alpha, beta and gamma)
8. In heating frozen foods in sealed pouches in a microwaves, why do you first poke holes in the pouch?