Tamil Nadu +2 physics important one mark questions
Current electricity - Set 3
15. The unit of conductivity is
(a) ohm-m (b) ohm (c) mho (d) mho-m-1
16. Drift velocity in metals is the order of
(a) 0.1ms-1 (b) 1cms-1 (c) 0.1cms-1 (d) 1ms-1
17. The emf of leclanche cell is
(a) 1.08 V (b) 1.5 V (c) 2 V (d) 1.8 V
18. The internal resistance of a secondary cell is
(a) Low (b) high (c) very low (d) very high
19. For metals , when the temperature increases their resistance
(a) Decreases (b) increases
(c) Remains constant (d)increases & then decreases
20. The resistance of mercury is zero at the temperature
(a)3.2 K (b)4.2 K (c) 4.2 °c (d) 0 K
21. The unit of magnetic induction is
(a) Tesla (b)Wb/m2 (c) Wbm2 (d) Both a and b
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