1
JEE Main 2020 (Online) 5th September Morning Slot
+4
-1
An electrical power line, having a total resistance of 2 $$\Omega$$, delivers 1 kW at 220 V. The efficiency of the transmission line is approximately :
A
85%
B
96%
C
72%
D
91%
2
JEE Main 2020 (Online) 5th September Morning Slot
+4
-1
A galvanometer of resistance G is converted into a voltmeter of range 0 – 1 V by connecting a resistance R1 in series with it. The additional resistance that should be connected in series with R1 to increase the range of the voltmeter to 0 – 2 V will be :
A
G
B
R1
C
R1 + G
D
R1 - G
3
JEE Main 2020 (Online) 4th September Evening Slot
+4
-1
The value of current i1 flowing from A to C in the circuit diagram is :
A
1 A
B
4 A
C
5 A
D
2 A
4
JEE Main 2020 (Online) 4th September Morning Slot
+4
-1
A battery of 3.0 V is connected to a resistor dissipating 0.5 W of power. If the terminal voltage of the battery is 2.5 V, the power dissipated within the internal resistance is :
A
0.50 W
B
0.072 W
C
0.10 W
D
0.125 W
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