1
JEE Main 2019 (Online) 9th January Morning Slot
+4
-1
When the switch S, in the circuit shown, is closed, then the value of current i will be :

A
3A
B
5A
C
4A
D
2A
2
JEE Main 2019 (Online) 9th January Morning Slot
+4
-1
A resistance is shown in the figure. Its value and tolerance are given respectively by :

A
270 $$\Omega$$, 10 %
B
27 k$$\Omega$$, 10 %
C
27 k$$\Omega$$, 20 %
D
270 $$\Omega$$, 5 %
3
JEE Main 2019 (Online) 9th January Morning Slot
+4
-1
Drift speed of electrons, when 1.5 A of current flows in a copper wire of cross section 5 mm2, is $$\upsilon$$. If the electron density in copper is 9 $$\times$$ 1028/m3 the value of $$\upsilon$$. in mm/s is close to (Take charge of electron to be = 1.6 $$\times$$ 10$$-$$19C)
A
0.02
B
3
C
2
D
0.2
4
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
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