Question

Choose the correct option :


(i) Which one of the options given below is a good conductor of electricity–


(a) Wood piece (b) Sheet of paper (c) Copper wire (d) glass rod


(ii) The instrument used to measure current in a circuit is–


(a) voltmeter (b) ammeter (c) odometer (d) none of these


(iii) The relation between V and I for a conducting wire is–


(a) a variable ratio (b) a fixed ratio

(c) sometimes variable sometime fixed (d) none of these


(iv) The resistance of an electrical instrument is 2.2 ohm and potential difference is 220

volts. Find out the value of current on connecting the instrument to a electric source–


(a) 5 A (b) 20 A (c) 25 A (d) 10 A


(v) The equivalent resistance of the following diagram would be–


(a) 25 Ω (b) 20 Ω (c) 10 Ω (d) 35 Ω

Answer 1

1) c
2) b
3)b
4) 100 A
5)b

Answer 2

i) a
ii ) b
iii) b
iv ) V / I = R
220 / 2.2
= 100
v) 20 ohm