Forward Bias

Q.

Two PN-junctions can be connected in series by three different methods as shown in the figure. If the potential difference in the junctions is the same, then the correct connections will be [IIT-JEE 1989]

1. In the circuit (2) and (3)

2. In the circuit (1) and (2)

3. In the circuit (1) and (3)

4. Only in the circuit (1)

Q.

When forward bias is applied to a p-n junction, then what happens to the potential barrier $V_B$, and the width of charge depletion region?

1. $V_B$ increases, x decreases

2. $V_B$ decreases, x increases

3. $V_B$ increases, x increases

4. $V_B$ decreases, x decreases

Q.

In the circuit, if the forward voltage drop for the diode is 0.5V, the current will be

1. 3.4 mA

2. 2 mA

3. 2.5 mA

4. 3 mA

Q.

In the forward bias arrangement of a PN-junction diode

1. The N-end is connected to the positive terminal of the battery

2. The P-end is connected to the positive terminal of the battery

3. The direction of current is from N-end to P-end in the diode

4. The P-end is connected to the negative terminal of battery

Q.

What does a high resistance reading in both forward and reverse bias directions indicate?

Q. What will happen when a 40 W, 220 V lamp and 100 W, 220 V lamp are connected in series across a 440 V supply?

जब 40 W, 220 V के एक लैम्प तथा 100 W, 220 V के एक लैम्प को 440 V सप्लाई पर सिरों पर श्रेणी में संयोजित किया जाता है, तब क्या घटित होगा?

1. Both lamps will fuse
   
   दोनों लैम्प फ्यूज हो जाएंगे
2. 100 W lamp will fuse
   
   100 W का लैम्प फ्यूज हो जाएगा
3. 40 W lamp will fuse
   
   40 W का लैम्प फ्यूज हो जाएगा
4. Neither lamp will fuse
   
   कोई भी लैम्प फ्यूज नहीं होगा

Q. Consider the junction diode is idea. The value of current in the figure is

1. zero
2. ${10}^{-1}A$
3. ${10}^{-3}A$
4. ${10}^{-2}A$

Q. Why is voltage same in parallel combination of resistors and different in series combination?

Q.

Power voltage rating of an electric bulb is 100 W 200 V, current drawn by it will be?

Q.

In the circuit given below, the value of the current is

1. 0 amp

2. 

3. 

4. 

Q. An ideal transformer is used on $220V$ line to deliver $2A$ at $110V$. What is the current through the primary coil ?

1. $5A$
2. $1A$
3. $0.1A$
4. $10A$

Q. A 200 W and a 100 W bulbs, both meant for operation at 200 V are connected in parallel. When connected to a 200 V supply, the power consumed by them will be

200 W के एक बल्ब तथा 100 W के एक बल्ब को समान्तर में संयोजित किया जाता है, दोनों बल्ब 200 V पर कार्य करते हैं। जब इन्हें 200 V सप्लाई से संयोजित किया जाता है, तब इनके द्वारा व्ययित शक्ति होगी

1. $\frac{200}{3}$ W
2. 300 W
3. 200 W
4. 100 W

Q. If three resistance 10 Ω, 20 Ω, 30 Ω, connected in parallel with 2.5 V battery then calculate total current supply in circuit

Q. THERE ARE TWO BULBS A AND B , IN SERIES COMBINATION THERE VOLTAGE SHOULD BE SAME TO GET THE POWER. BUT IN SERIES COMBINATION VOLTAGE IS DIFFERENT AND CURRENT IS SAME SO, IN THIS HOW THE BULB WILL HAVE SAME VOLTAGE?

Q. A $20\text{H.P.}$ motor is used in a lift of a $100\text{m}$ tall building. If the elevator takes $45$ seconds to travel from the ground floor to the top of the building, calculate the work done by the motor.