A carbon microphone is best used in
1). Dynamo?
2). telephone?
3). Transformer
4). None of these?
2. A photostat machine works on
3. In which form is the supplied heat energy stored during change in temperature of substance?
5. During the Independence Movement, Subhash Chandra Bose revamped the Indian National __________.
6. A hydrogen balloon floats up because of
7. One should not connect a number of electrical appliances to the same power socket because
8. Which of the following physical quantities is a scalar quantity?
9. White clothes are cooler than black ones because they
10. The part of the eye having the larges refractive index is :