1
JEE Main 2018 (Online) 16th April Morning Slot
+4
-1
A galvanometer with its coil resistance 25 $$\Omega$$ requires a current of 1 mA for its full deflection. In order to construct an ammeter to read upto a current of 2 A, the approximate value of the shunt resistance should be :
A
$$2.5 \times {10^{ - 3}}\,\Omega$$
B
$$1.25 \times {10^{ - 2}}\Omega$$
C
$$1.25 \times {10^{ - 3}}\Omega$$
D
$$2.5 \times {10^{ - 2}}\Omega$$
2
JEE Main 2018 (Online) 16th April Morning Slot
+4
-1
A heating element has a resistance of 100 $$\Omega$$ at room temperature. When it is connected to a supply of 220 V, a steady current of 2 A passes in it and temperature is 500oC more than room temperature. what is the temperature coefficient of resistance of the heating element ?
A
0.5 $$\times$$ 10$$-$$4 oC$$-$$1
B
5 $$\times$$ 10$$-$$4 oC$$-$$1
C
1 $$\times$$ 10$$-$$4 oC$$-$$1
D
2 $$\times$$ 10$$-$$4 oC$$-$$1
3
JEE Main 2018 (Online) 16th April Morning Slot
+4
-1
In a circuit for finding the resistance of a galvanometer by half deflection method, a 6 V battery and a high resistance of 11 k$$\Omega$$ are used. The figure of merit of the galvanometer is 60 $$\mu A/$$division. In the absence of shunt resistance, the galvanometer produces a deflection of $$\theta$$ = 9 divisions when current flows in the circuit. The value of the shunt resistance that can cause the deflection of $$\theta /2,$$ is closest to :
A
500 $$\Omega$$
B
220 $$\Omega$$
C
55 $$\Omega$$
D
110 $$\Omega$$
4
JEE Main 2018 (Offline)
+4
-1
Two batteries with e.m.f 12 V and 13 V are connected in parallel across a load resistor of 10 $$\Omega$$. The internal resistances of the two batteries are 1 $$\Omega$$ and 2 $$\Omega$$ respectively. The voltage across the load lies between :
A
11.7 V and 11.8 V
B
11.6 V and 11.7 V
C
11.5 V and 11.6 V
D
11.4 V and 11.5 V
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