1
JEE Main 2019 (Online) 10th January Evening Slot
+4
-1
The Wheatstone bridge shown in figure, here, gets balanced when the carbon resistor used as R1 has the colour code (Orange, Red, Brown). The resistors R2 and R4 are 80$$\Omega$$ and 40$$\Omega$$, respectively. Assuming that the colour code for the carbon resistors gives their accurate values, the colour code for the carbon resistor, used as R3, would be -

A
Brown, Blue, Brown
B
Grey, Black, Brown
C
Red, Green, Brown
D
Brown, Blue, Black
2
JEE Main 2019 (Online) 10th January Evening Slot
+4
-1
The actual value of resistance R, shown in the figure is 30$$\Omega$$. This is measuered in an experiment as shown using the standard formula R = $${V \over {\rm I}}$$, where V and I are the readings of the voltmeter and ammeter, respectively. If the measured value of R is 5% less, then the internal resistance of the voltmeter is -

A
570 $$\Omega$$
B
600 $$\Omega$$
C
350 $$\Omega$$
D
35 $$\Omega$$
3
JEE Main 2019 (Online) 10th January Morning Slot
+4
-1
A uniform metallic wire has a resistance of 18 $$\Omega$$ and is bent into an equilateral triangle. Then, the resistance between any two vertices of the triangle is -
A
12 $$\Omega$$
B
2 $$\Omega$$
C
4 $$\Omega$$
D
8 $$\Omega$$
4
JEE Main 2019 (Online) 10th January Morning Slot
+4
-1
A 2 W carbon resistor is color coded with green, black, red and brown respectively. The maximum current which can be passed through this resistor is -
A
0.4 mA
B
20 mA
C
63 mA
D
100 mA
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