1
JEE Main 2020 (Online) 3rd September Morning Slot
+4
-1
When a diode is forward biased, it has a voltage drop of 0.5 V. The safe limit of current through the diode is 10 mA. If a battery of emf 1.5 V is used in the circuit, the value of minimum resistance to be connected in series with the diode so that the current does not exceed the safe limit is
A
50 $$\Omega$$
B
200 $$\Omega$$
C
300 $$\Omega$$
D
100 $$\Omega$$
2
JEE Main 2020 (Online) 2nd September Evening Slot
+4
-1
In the following digital circuit, what will be the output at ‘Z’, when the
input (A, B) are (1, 0), (0, 0), (1, 1,), (0, 1)
A
1, 1, 0, 1
B
0, 1, 0, 0
C
1, 0, 1, 1
D
0, 0, 1, 0
3
JEE Main 2020 (Online) 9th January Evening Slot
+4
-1
The current i in the network is :
A
0.6 A
B
0.3 A
C
0 A
D
0.2 A
4
JEE Main 2020 (Online) 9th January Evening Slot
+4
-1
Two identical capacitors A and B, charged to the same potential 5V are connected in two different circuits as shown below at time t = 0. If the charge on capacitors A and B at time t = CR is QA and QB respectively, then (Here e is the base of natural logarithm)
A
QA = $${{CV} \over e}$$, QB = $${{VC} \over 2}$$
B
QA = $${{CV} \over 2}$$, QB = $${{VC} \over e}$$
C
QA = VC, QB = $${{VC} \over e}$$
D
QA = VC, QB = CV
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