1
JEE Main 2022 (Online) 24th June Morning Shift
+4
-1

Two identical cells each of emf 1.5 V are connected in parallel across a parallel combination of two resistors each of resistance 20 $$\Omega$$. A voltmeter connected in the circuit measures 1.2 V. The internal resistance of each cell is :

A
2.5 $$\Omega$$
B
4 $$\Omega$$
C
5 $$\Omega$$
D
10 $$\Omega$$
2
JEE Main 2021 (Online) 1st September Evening Shift
+4
-1
Due to cold weather a 1 m water pipe of cross-sectional area 1 cm2 is filled with ice at $$-$$10$$^\circ$$C. Resistive heating is used to melt the ice. Current of 0.5A is passed through 4 k$$\Omega$$ resistance. Assuming that all the heat produced is used for melting, what is the minimum time required? (Given latent heat of fusion for water/ice = 3.33 $$\times$$ 105 J kg$$-$$1, specific heat of ice = 2 $$\times$$ 103 J kg$$-$$1 and density of ice = 103 kg/m3
A
0.353 s
B
35.3 s
C
3.53 s
D
70.6 s
3
JEE Main 2021 (Online) 1st September Evening Shift
+4
-1
Two resistors R1 = (4 $$\pm$$ 0.8) $$\Omega$$ and R2 = (4 $$\pm$$ 0.4) $$\Omega$$ are connected in parallel. The equivalent resistance of their parallel combination will be :
A
(4 $$\pm$$ 0.4) $$\Omega$$
B
(2 $$\pm$$ 0.4) $$\Omega$$
C
(2 $$\pm$$ 0.3) $$\Omega$$
D
(4 $$\pm$$ 0.3) $$\Omega$$
4
JEE Main 2021 (Online) 31st August Evening Shift
+4
-1
The equivalent resistance of the given circuit between the terminals A and B is :

A
0$$\Omega$$
B
3$$\Omega$$
C
$${9 \over 2}$$$$\Omega$$
D
1$$\Omega$$
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