Q.1.
Ratio of the amount of heat developed in the four arms of a balanced wheat stone bridge, when the arms have resistance P=100Ω, Q=10Ω, R=300 Ω and S=30 Ω respectively is
-
100%
a) 3:30:1:10
-
0%
b) 30:3:10:1
-
0%
c)30:10:1:3
-
0%
d)30:1:3:10
Explanation
Q.2.
Twenty one similar electric bulbs, each of resistance r are connected in series across 220 V supply. After one bulb is fused, the remaining bulbs are connected again in series cross the same supply. The percentage total change in illumination of bulbs is
-
0%
a) decrease by 5%
-
0%
b) increase by 5%
-
0%
c) decrease by 10%
-
100%
d) increase by 10%
Q.3.
The current capacity of a storage cell is 3 Ah. The maximum current it can supply for half hour is
-
0%
a)1.5 A
-
0%
b) 3 A
-
100%
c)4.5 A
-
0%
d)6.0 A
Q.4.
The current capacity of the charged secondary cell does not depend on
-
0%
a) rate of discharge
-
100%
b) temperature
-
0%
c)amount of active material
-
0%
d)rate of charging
Q.5.
The amount of ions liberated by 96500C charge passed through the electrolyte is called
-
0%
a) electrochemical equivalent
-
0%
b) chemical equivalent
-
100%
c)gram equivalent
-
0%
d)none of the above
Q.6.
Which of the following acts as depolariser in Leclanche cell?
-
0%
a) MnO2
-
0%
b) NH4Cl
-
0%
c) Mn2O3
-
100%
d) ZnCl2