A Zener diode, having breakdown voltage equal to 15 V, is used in a voltage regulator circuit shown in the figure. The current through the diode is :

                      

1. 10 mA                                                    2. 15 mA

3. 20 mA                                                     4. 5 mA

 

 

Subtopic:  Applications of PN junction |
 61%
From NCERT
NEET - 2011
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

Which one of the following statement is false?

(1) Pure Si doped with trivalent impurities gives a p-type semiconductor 

(2) Majority carries in a n-type semiconductor are holes

(3) Minority carries in a p-type semiconductor are electrons

(4) The resistance of intrinsic semiconductor decreases with increase of temperature 

Subtopic:  Types of Semiconductors |
 87%
From NCERT
NEET - 2010
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

To get an output Y =1 from the circuit shown below, the input must be

        A     B     C

(1)   0      1     0

(2)   0      0     1

(3)   1      0     1

(4)   1      0     0

 

Subtopic:  Logic gates |
 95%
From NCERT
NEET - 2010
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

advertisementadvertisement

The following figure shows a logic gate circuit with two inputs A and B and the output Y. The voltage waveforms of A, B and Y are as given

                            

The logic gate is 

(1) NOR gate                                                 

(2) OR gate

(3) AND  gate                                                 

(4) NAND gate

Subtopic:  Logic gates |
 76%
From NCERT
NEET - 2010
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

For transistor action

(1) Base, emitter and collector regions should have similar size and doping concentrations.

(2) The base regions must be very thin and lightly doped.

(3) The emitter-base junction is forward biased and the base-collector junction is reverse biased.

(4) Both the emitter-base junction as well as the base-collector junction are forward biased.

Which of the following pairs of statements is correct?

(a)   (4) and (1)                                       (b)   (1) and (2)

(c)   (2) and (3)                                       (d)    (3) and (4)

Subtopic:  Transistor (OLD NCERT) |
 86%
From NCERT
NEET - 2010
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

A p-n photodiode is fabricated from a semiconductor with a band gap of 2.5 eV. It can detect a signal of wavelength 

(a) 6000 A                                    (b) 4000 nm

(c) 6000 nm                                  (d) 4000 A

Subtopic:  Applications of PN junction |
 65%
From NCERT
NEET - 2009
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

advertisementadvertisement

 

The circuit is equivalent to

1. AND gate                              2. NAND gate

3. NOR gate                              4. OR gate 

Subtopic:  Logic gates |
 64%
From NCERT
NEET - 2008
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

The electrical circuit used to get smooth output from a rectifier circuit is called 

(1) Oscillator                         

(2) Filter

(3) Amplifier                           

(4) Logic gates

Subtopic:  Rectifier |
 58%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

PN-junction diode works as a insulator, if connected

(1) To A.C.                             

(2) In forward bias
(3) In reverse bias                   

(4) None of these

Subtopic:  Applications of PN junction |
 88%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

advertisementadvertisement

The PN junction diode is used as

(1) An amplifier                       

(2) A rectifier
(3) An oscillator                       

(4) A modulator

Subtopic:  Applications of PN junction |
 65%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch