1
JEE Main 2022 (Online) 25th July Morning Shift
Numerical
+4
-1 The energy band gap of semiconducting material to produce violet (wavelength = 4000$$\mathop A\limits^o$$ ) LED is ______________ $$\mathrm{eV}$$. (Round off to the nearest integer).

2
JEE Main 2022 (Online) 30th June Morning Shift
Numerical
+4
-1

The circuit diagram used to study the characteristic curve of a zener diode is connected to variable power supply (0 $$-$$ 15 V) as shown in figure. A zener diode with maximum potential Vz = 10 V and maximum power dissipation of 0.4 W is connected across a potential divider arrangement. The value of resistance RP connected in series with the zener diode to protect it from the damage is ________________ $$\Omega$$. 3
JEE Main 2022 (Online) 29th June Evening Shift
Numerical
+4
-1 A potential barrier of 0.4 V exists across a p-n junction. An electron enters the junction from the n-side with a speed of 6.0 $$\times$$ 105 ms$$-$$1. The speed with which electron enters the p side will be $${x \over 3} \times {10^5}$$ ms$$-$$1 the value of x is _____________.

(Given mass of electron = 9 $$\times$$ 10$$-$$31 kg, charge on electron = 1.6 $$\times$$ 10$$-$$19 C.)

4
JEE Main 2022 (Online) 29th June Morning Shift
Numerical
+4
-1 A transistor is used in an amplifier circuit in common emitter mode. If the base current changes by 100 $$\mu$$A, it brings a change of 10 mA in collector current. If the load resistance is 2 k$$\Omega$$ and input resistance is 1 k$$\Omega$$, the value of power gain is x $$\times$$ 104. The value of x is _____________.

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