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Two Mark Questions, 1. Name the unit of (a) electrical resistance (b), resistivity, 2. Define One Ohm, 3. Define Resistivity, 4. Determine the direction of conventional current?, 5. What is electrical power? Write its unit., Three Mark Questions, 6. You take two resistors of resistance 2R and 3R, and connect them in parallel in an electric circuit., Calculate the ratio of the electrical power consumed, by 2R and 3R?, 7. Asmall bulb has a resistance of 20 when cold. It, takes up a current of 0.4 A from a source of 4V and, then starts glowing. Calculate (i) the resistance of the, bulb when it is glowing and, , (ii) Elaborate on the reason for the difference in, resistance?, 8. Define resistance and resistivity and also give the, relation between them. Explain the dependence of, resistance on temperature., 9. A bulb is rated at 330V- 110W. What do you think, is its resistance? Three such bulbs burn for 5Shrs at a, stretch. What is the energy consumed? Calculate the, cost in rupees if the rate is 70 paise per unit?, 10. Calculate the resistance of 2 km long copper, wire of radius 2 mm. (Resistivity of copper = 1.72 x 1, 0°8)