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Recent questions tagged physics
Questions
How many NAND gates are used to form an AND gate
jeemain
physics
class12
unit19
ch14
q63
medium
logic-gates
semiconductor-electronics
asked
Jan 29, 2014
by
meena.p
1
answer
How many electrons must be removed from a piece of metal to give it a positive charge of $\;1\times10^{-7} \;C\;?$
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-charge
easy
asked
Jan 29, 2014
by
yamini.v
1
answer
Truth table given below represents
jeemain
physics
class12
unit19
ch14
q62
medium
logic-gates
semiconductor-electronics
asked
Jan 28, 2014
by
meena.p
1
answer
The following logic symbol represents
jeemain
physics
class12
ch14
q61
easy
logic-gates
semiconductor-electronics
concepts
asked
Jan 28, 2014
by
meena.p
1
answer
For a given transistor, the value of the forward transfer ratio $\beta =50$. Calculatethe ratio of change in collector current to the change in emitter current.
jeemain
physics
class12
unit19
ch14
q60
easy
transistors
semiconductor-electronics
asked
Jan 28, 2014
by
meena.p
1
answer
WHich of the following best describes the output of a full wave rectifier:
jeemain
physics
class12
unit19
ch14
q59
medium
semiconductor-electronics
diodes
concepts
asked
Jan 28, 2014
by
meena.p
1
answer
The emitter current in a transistor is $ 1mA$ If $\alpha =0.95$ value of base current is :
jeemain
physics
class12
unit19
ch14
q58
medium
transistors
semiconductor-electronics
asked
Jan 28, 2014
by
meena.p
1
answer
The transconductance of a transistor used as an amplifier in common emitter mode is $0.1 \;mho.$ When a signal of 10 mv is added to base emitter voltage change in collector current is
jeemain
physics
class12
unit19
ch14
q57
easy
transistors
semiconductor-electronics
asked
Jan 28, 2014
by
meena.p
1
answer
Given $\Delta V_{BE} = $ potential difference across base emitter, $\Delta I_C = $ change in collector current, $\Delta I_B = $ change in the base current and $\Delta R_{BE} = $ change in base emitter resistance, which of the following best represents transconductance $g_m$.
jeemain
physics
class12
unit19
ch14
q56
easy
transistors
semiconductor-electronics
concepts
asked
Jan 28, 2014
by
meena.p
1
answer
In a p-n function diode a input signal is applied as shown. The output across $R_L$ is
jeemain
physics
class12
unit19
ch14
q54
medium
junction-diodes
semiconductor-electronics
concepts
asked
Jan 28, 2014
by
meena.p
1
answer
Which of the following quantities cannot be zero on an average for the molecules of an ideal gas in equilibrium condition?
jeemain
physics
kinetic-theory-of-gases
ch13
class11
easy
molecular-nature-of-matter
asked
Jan 28, 2014
by
balaji.thirumalai
1
answer
Which of the following relations hold true for a monatomic gas?
jeemain
physics
kinetic-theory-of-gases
easy
class11
ch13
specific-heat-capacity
molar-specific-heat
asked
Jan 28, 2014
by
balaji.thirumalai
1
answer
In a transistor the level of doping for the three region is different . In the order of decreasing doping level,
jeemain
physics
class12
unit19
ch14
q53
easy
semiconductor-electronics
concepts
asked
Jan 28, 2014
by
meena.p
1
answer
The specific heat of a gas:
jeemain
physics
kinetic-theory-of-gases
easy
class11
ch13
specific-heat-capacity
asked
Jan 28, 2014
by
balaji.thirumalai
1
answer
Under the conditions when no bias is applied across a p-n junction
jeemain
physics
class12
unit19
ch14
q52
easy
semiconductor-electronics
concepts
asked
Jan 28, 2014
by
meena.p
1
answer
Which of the following is used to produce ratio waves of constant amplitude
jeemain
physics
class12
unit19
ch14
q51
easy
semiconductor-electronics
concepts
asked
Jan 28, 2014
by
meena.p
1
answer
Keeping the volume constant and increasing the temperature, which of the following will hold true?
jeemain
physics
kinetic-theory-of-gases
class11
ch13
kinetic-theory-of-an-ideal-gas
kinetic-interpretation-of-temperature
easy
asked
Jan 28, 2014
by
balaji.thirumalai
1
answer
When p end of P-n junction is connected to positive terminal of the battery and N end to negative terminal , the p-n junction behaves like
jeemain
physics
class12
unit19
ch14
q50
easy
semiconductor-electronics
concepts
asked
Jan 28, 2014
by
meena.p
1
answer
Which of the following statement is incorrect ?
jeemain
physics
class12
unit19
ch14
q49
easy
semiconductor-electronics
concepts
asked
Jan 28, 2014
by
meena.p
1
answer
For approximately ten times increase in conductivity of a semiconductor the impurity to be added is of the order of
jeemain
physics
class12
unit19
ch14
q48
easy
semiconductor-electronics
concepts
asked
Jan 28, 2014
by
meena.p
1
answer
The valancy of impurity atom added to silicon to make it P type is
jeemain
physics
class12
unit19
ch14
q47
easy
semiconductor-electronics
concepts
asked
Jan 28, 2014
by
meena.p
1
answer
The forbidden gap in energy bands in silicon is order of
jeemain
physics
class12
unit19
ch14
q46
easy
semiconductor-electronics
concepts
asked
Jan 28, 2014
by
meena.p
1
answer
Which is doped heaviest in a transistor
jeemain
physics
class12
unit19
ch14
q45
easy
semiconductor-electronics
concepts
asked
Jan 28, 2014
by
meena.p
1
answer
The average translational kinetic enegry of Oxygen molecules (molecular weight of $O_2$ is 32) at a particlular temperature is 0.032eV. What is the average translational kinetic energy of $N_2$ molecules (molecular weight is 28) at the same temperature
jeemain
physics
kinetic-theory-of-gases
class11
ch13
kinetic-theory-of-an-ideal-gas
kinetic-interpretation-of-temperature
easy
asked
Jan 28, 2014
by
balaji.thirumalai
1
answer
A change of 10 mA in the emitter current produces a change of 7.5 mA in collector current in a transistor . What should be change in base current to produce the same change in collector current.
jeemain
physics
class12
unit19
ch14
q44
easy
transistors
semiconductor-electronics
asked
Jan 28, 2014
by
meena.p
1
answer
A vessel is filled with an ideal gas at 76 cm of Hg (mercury). The mass of gas is increased by 25% by introducing more gas at the same temperature. What is the resultant pressure of Hg in cm?
molecular-nature-of-matter
jeemain
physics
kinetic-theory-of-gases
class11
ch13
behaviour-of-gases
ideal-gas-law
kinetic-theory-of-an-ideal-gas
pressure-of-an-ideal-gas
easy
asked
Jan 28, 2014
by
balaji.thirumalai
1
answer
The energy density of an ideal monoatomic gas is equal to:
jeemain
physics
kinetic-theory-of-gases
class11
ch13
kinetic-interpretation-of-temperature
medium
energy-density
atomicity
asked
Jan 28, 2014
by
balaji.thirumalai
1
answer
The $x$-components of velocity of some particles (in $km/s$) are $6,4,2,0,-2,-4,-6$. The root-mean-square (rms) velocity calculated from these data (in $km/s$) is nearest to?
speed-of-molecules
jeemain
physics
kinetic-theory-of-gases
class11
ch13
kinetic-theory-of-an-ideal-gas
kinetic-interpretation-of-temperature
medium
asked
Jan 28, 2014
by
balaji.thirumalai
1
answer
A given sample of ideal gas is made to undergo a process in which the temperature decreases by 10% and the pressure decreases by 8%. By what % does the volume change?
jeemain
physics
kinetic-theory-of-gases
class11
ch13
behaviour-of-gases
ideal-gas-law
easy
asked
Jan 28, 2014
by
balaji.thirumalai
1
answer
A transistor in common emitted mode the load resistance is $2k \Omega$ and the current gain $\beta =50,$ What is the power if input resistance is $500 \Omega$
jeemain
physics
class12
unit19
ch14
q43
medium
transistors
semiconductor-electronics
asked
Jan 28, 2014
by
meena.p
1
answer
When negative voltage feedback is applied to an amplifier of gain 150, the overall gain falls to 15. Find the fraction of the output that is feedback to the input.
jeemain
physics
class12
unit19
ch14
q42
medium
transistors
semiconductor-electronics
asked
Jan 28, 2014
by
meena.p
1
answer
In an amplifier, negative feedback is introduced with feedback fraction $\beta =0.01$. If voltage given with out negative feed back. is $2500$ what is voltage gain with negative feed back.
jeemain
physics
class12
unit19
ch14
q41
medium
transistors
semiconductor-electronics
asked
Jan 28, 2014
by
meena.p
1
answer
In an n-p-n transistor only $3 \%$ of the charge carriers are allerved to recombine in the base region. The value of $ \alpha$ is
jeemain
physics
class12
unit19
ch14
q40
medium
transistors
semiconductor-electronics
pn-junction
asked
Jan 28, 2014
by
meena.p
1
answer
What is the emitter current $I_E$ in a transfer where base current $I_B$ is $20 \mu A$ and $\beta =40$
jeemain
physics
class12
unit19
ch14
q39
medium
transistors
semiconductor-electronics
asked
Jan 28, 2014
by
meena.p
1
answer
What is the output resistance, When we observe in a common emitter circuit the collector current increase from $9.5 \;mA\;to 10\;mA$ When the collector voltage increase from $2.5 \;to \;6v$ When base current is kept constant .
jeemain
physics
class12
unit19
ch14
q38
medium
transistors
semiconductor-electronics
asked
Jan 28, 2014
by
meena.p
1
answer
In a common base amplifier current gain is $0.96$ and emitter current is $7.2\;mA$. The base current is
jeemain
physics
class12
unit19
ch14
q37
medium
transistors
semiconductor-electronics
asked
Jan 28, 2014
by
meena.p
1
answer
In a common emitter transistor the current gain is 80. What is change in collector current , when change in base current is $250 \mu A$
jeemain
physics
class12
unit19
ch14
q36
easy
transistors
semiconductor-electronics
asked
Jan 28, 2014
by
meena.p
1
answer
In the use of transistor as an amplifier $I_f \alpha =\large\frac{I_c}{I_e}$ and $\beta =\large\frac{I_c}{I_b}$ where $I_c$- collector current $I_b$- base current $I_e$- emitter current then
jeemain
physics
class12
unit19
ch14
q35
easy
transistors
semiconductor-electronics
asked
Jan 28, 2014
by
meena.p
1
answer
In a transistor collector base is ____ biased and emitter base is _____ biased.
jeemain
physics
class12
unit19
ch14
q34
easy
semiconductor-electronics
concepts
asked
Jan 28, 2014
by
meena.p
1
answer
An electron enters the p-n junction from the n-side with a velocity of $5 \times 10^5 m/s$ . If the depletion region is $5 \times 10^{-7} m/s$ wide and the potential barrier is $0.5 V$ What will be its speed When it enters P side ?
jeemain
physics
class12
ch14
intrinsic-and-extrinsic-semiconductor
semiconductor-electronics
medium
asked
Jan 28, 2014
by
meena.p
1
answer
An electron losely bound to the impurity of a doped semiconductor is able to jump to the conducting band because of thermal collision at temperature T k. If the impurity level is 15 mev below the conducting band, calculate the temperature.
jeemain
physics
class12
ch14
intrinsic-and-extrinsic-semiconductor
semiconductor-electronics
medium
asked
Jan 28, 2014
by
meena.p
1
answer
What is the resistivity of n-type semiconductors given: Density of conducting electrons $=8 \times 10^{13} /cc$; Density of holes $=5 \times 10^{12} /cc$ mobility of electron $=2.3 \times 10^4 cm^2 /v-s$ mobility of holes $=100 cm^2 /v-s$
jeemain
physics
class12
ch14
intrinsic-and-extrinsic-semiconductor
semiconductor-electronics
medium
asked
Jan 28, 2014
by
meena.p
1
answer
Find the current through resistance in the circuit.
jeemain
physics
class12
unit19
ch14
q30
medium
junction-diodes
semiconductor-electronics
asked
Jan 28, 2014
by
meena.p
1
answer
Let Potential at A and B be $V_A$ and $V_B$ respectively . In the given circuit. If the effective resistance is found to be $5 \Omega$ Then
jeemain
physics
class12
unit19
ch14
q29
difficult
junction-diodes
semiconductor-electronics
asked
Jan 28, 2014
by
meena.p
1
answer
What is reading in ammeter $A_1$ and $A_2$ in given circuit.
jeemain
physics
class12
unit19
ch14
q28
difficult
junction-diodes
semiconductor-electronics
asked
Jan 27, 2014
by
meena.p
1
answer
In the given diagram resistance of each diode in forward bias is zero and infinity in reverse bias . If a 2V battery is connected as shown in circuit What is the effective current.
jeemain
physics
class12
unit19
ch14
q27
medium
junction-diodes
semiconductor-electronics
asked
Jan 27, 2014
by
meena.p
1
answer
When a 10v battery is connected as shown in the circuit what is the potential difference across A and B ?
jeemain
physics
class12
unit19
ch14
q26
medium
junction-diodes
semiconductor-electronics
asked
Jan 27, 2014
by
meena.p
1
answer
The diode connected in forward bias has zero resistance and if connected in reverse biase has infinity resistance Find the effective resistance across A and B the given circuit.
jeemain
physics
class12
unit19
ch14
q25
medium
junction-diodes
semiconductor-electronics
asked
Jan 27, 2014
by
meena.p
1
answer
What is current and voltage across the diode in The given circuit given drift current is $ 2 \times 10^{-3}A$
jeemain
physics
class12
unit19
ch14
q24
sec-a
medium
junction-diodes
semiconductor-electronics
asked
Jan 27, 2014
by
meena.p
1
answer
In a p-n junction hole with kinetic energy 250 mev approaches the junction from m-side . The potential barrier is 200 mev. What will be its kinetic energy when it crosses the junction .
jeemain
physics
class12
unit19
ch14
q23
easy
asked
Jan 27, 2014
by
meena.p
1
answer
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