1
JEE Main 2020 (Online) 8th January Evening Slot
+4
-1
A galvanometer having a coil resistance 100 $$\Omega$$ gives a full scale deflection when a current of 1 mA is passed through it. What is the value of the resistance which can convert this galvanometer into a voltmeter giving full scale deflection for a potential difference of 10 V?
A
8.9 k$$\Omega$$
B
10 k$$\Omega$$
C
9.9 k$$\Omega$$
D
7.9 k$$\Omega$$
2
JEE Main 2020 (Online) 8th January Morning Slot
+4
-1
The length of a potentiometer wire is 1200 cm and it carries a current of 60 mA. For a cell of emf 5V and internal resistance of 20$$\Omega$$, the null point on it is found to be a 1000 cm. The resistance of whole wire is :
A
80$$\Omega$$
B
60$$\Omega$$
C
120$$\Omega$$
D
100$$\Omega$$
3
JEE Main 2020 (Online) 7th January Evening Slot
+4
-1
In the figure, potential difference between A and B is :
A
10 V
B
5 V
C
zero
D
15 V
4
JEE Main 2020 (Online) 7th January Evening Slot
+4
-1
In a building there are 15 bulbs of 45 W, 15 bulbs of 100 W, 15 small fans of 10 W and 2 heaters of 1 kW. The voltage of electric main is 220 V. The minimum fuse capacity (rated value) of the building will be :
A
15 A
B
20 A
C
25 A
D
10 A
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