# In semiconductors, which of the following gives the law of mass action? (where symbols have their usual meanings.) 1. $$n_i=n_e=n_h$$ 2. $$n_i^2=n_en_h$$ 3. $$n_h>> n_e$$ 4. $$n_h<<n_e$$

Subtopic:  Types of Semiconductors |
82%
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

The conductivity of an n-type semiconductor whose density of conduction electrons is ${\mathrm{n}}_{\mathrm{e}}$, Density of holes is ${\mathrm{n}}_{\mathrm{h}}$, Mobility of conduction electrons is ${\mathrm{m}}_{\mathrm{e}}$and Mobility of holes is ${\mathrm{m}}_{\mathrm{h}},$ will be

1.

2.

3.

4.

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

The current through an ideal p-n junction diode shown in the circuit will be -

1.  5 A

2.  0.2 A

3.  0.6 A

4.  Zero

Subtopic:  PN junction |
60%
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

1.  36 mW

2.  12 mW

3.  144 mW

4.  64 mW

Subtopic:  Applications of PN junction |
64%
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

A semiconductor is known to have an electron concentration of $8×{10}^{13}$ cm-3 and a hole concentration of $5×{10}^{2}$ cm-3. The semiconductor is:

1.  n-type

2.  p-type

3.  intrinsic

4.  insulator

Subtopic:  Types of Semiconductors |
87%
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

1.

2.

3.

4.  All of these

Subtopic:  Transistor (OLD NCERT) |
73%
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints

Which of the following is correct for $$\mathrm{n}$$-type semiconductors?

 1 electron is the majority carriers and trivalent atoms are dopants. 2 electrons are majority carriers and pentavalent atoms are dopants. 3 holes are majority carriers and pentavalent atoms are dopants. 4 holes are majority carriers and trivalent atoms are dopants.
Subtopic:  Types of Semiconductors |
86%
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

When a transistor is used as a switch it is in:

1.  Active state

2.  Cut off state

3.  Saturation state

4.  Both cut off state and saturation state are possible

Subtopic:  Applications of Transistor (OLD NCERT) |
62%
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

When a p-n junction is forward biased, then:

 1 the depletion region becomes thick. 2 the p-side is at a higher potential than n side. 3 the current flowing is zero. 4 the effective resistance is of the order of $$10^6 ~\Omega$$.

Subtopic:  PN junction |
82%
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

A transistor is operated in common emitter configuration at  When base current is changed from 10mA to 30mA, it produces a change in emitter current from 2A to 4A, the current amplification factor is

1.  100

2.  99

3.  10

4.  9

Subtopic:  Applications of Transistor (OLD NCERT) |
52%
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints