Recent questions tagged concepts

The length of string of a simple pendulum as measured by a meter scale was found to be $98.2 \;cm$ The diameter of the bob was measured by a vernier caliper and it was found to be $3.62\;cm$ The time for 10 oscillations was found to be $21.2\; s$ . To get more accurate value of g , will more accurate measurement of bob will help ?

asked Jul 11, 2014 by meena.p

1 answer

Consider the following statements \[\] Statement 1: The electric bulb glows immediately when switch is turned on \[\] Statement 2: The drift velocity of electrons is very high in metallic conductors

asked Feb 16, 2014 by thanvigandhi_1

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Consider the following statements \[\] Statement 1: Voltmeter is much better than a potentiometer for measuring the emf of the cell \[\] Statement 2: A potentiometer draws no current while measuring the emf of the cell

asked Feb 16, 2014 by thanvigandhi_1

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Which of the following has the maximum resistance?

asked Feb 6, 2014 by thanvigandhi_1

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The net resistance of a voltmeter should be large to ensure that

asked Feb 3, 2014 by thanvigandhi_1

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When forward bias is applied to a p-n junction.

asked Jan 31, 2014 by meena.p

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A Diode Laser

asked Jan 31, 2014 by meena.p

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When a solid with a band gap has a donor level just below its empty energy band, its solid is

asked Jan 31, 2014 by meena.p

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Which of the following logic gate is an universal gate

asked Jan 31, 2014 by meena.p

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Using law of Boolean Algebra the value of $A+(\bar {A}B)$

asked Jan 31, 2014 by meena.p

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Transistor working as an amplifier operates in its active region of characteristic only when

asked Jan 31, 2014 by meena.p

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If the 0 and 1 are inputs for a NAND gate what would be the output?

asked Jan 30, 2014 by meena.p

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Which of the statement about NOT gate is true?

asked Jan 30, 2014 by meena.p

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Which of the gate is represented by

asked Jan 29, 2014 by meena.p

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The following logic symbol represents

asked Jan 28, 2014 by meena.p

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WHich of the following best describes the output of a full wave rectifier:

asked Jan 28, 2014 by meena.p

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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 $g_m$.

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

asked Jan 28, 2014 by meena.p

1 answer

In a transistor the level of doping for the three region is different . In the order of decreasing doping level,

asked Jan 28, 2014 by meena.p

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Under the conditions when no bias is applied across a p-n junction

asked Jan 28, 2014 by meena.p

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Which of the following is used to produce ratio waves of constant amplitude

asked Jan 28, 2014 by meena.p

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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

asked Jan 28, 2014 by meena.p

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Which of the following statement is incorrect ?

asked Jan 28, 2014 by meena.p

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For approximately ten times increase in conductivity of a semiconductor the impurity to be added is of the order of

asked Jan 28, 2014 by meena.p

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The valancy of impurity atom added to silicon to make it P type is

asked Jan 28, 2014 by meena.p

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The forbidden gap in energy bands in silicon is order of

asked Jan 28, 2014 by meena.p

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Which is doped heaviest in a transistor

asked Jan 28, 2014 by meena.p

1 answer

In a transistor collector base is biased and emitter base is _ biased.

asked Jan 28, 2014 by meena.p

1 answer

Which of the following is reverse biased diode.

asked Jan 27, 2014 by meena.p

1 answer

In LEDs one can see emitted light to because

asked Jan 27, 2014 by meena.p

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Avalanche breakdown is due to

asked Jan 27, 2014 by meena.p

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Zener breakdown occurs:

asked Jan 27, 2014 by meena.p

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The approximate ratio of resistance in forward bias of p-n junction is

asked Jan 27, 2014 by meena.p

1 answer

The conduction band of a solid is partially filled at OK.Then the solid is

asked Jan 27, 2014 by meena.p

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Electrical conductivity of pure germanium can be increased by 1) increasing the temperature 2) doping with donor impurities 3) radiation with ultra violet rays. 4) doping with acceptor impurities

asked Jan 27, 2014 by meena.p

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The impurity atom with which pure silicon can be doped to make p-type semiconductors are

asked Jan 27, 2014 by meena.p

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The diffusion current in p-n junction is due to

asked Jan 27, 2014 by meena.p

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Electronic conduction to in a semiconductor takes place due to

asked Jan 27, 2014 by meena.p

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Which of the following are incorrect statements about a transistor?

asked Jan 27, 2014 by meena.p

1 answer

The reverse bias in p-n junction

asked Jan 27, 2014 by meena.p

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In p-n junction diode : the depletion zone has

asked Jan 27, 2014 by meena.p

1 answer

Semi conductors doped with donor atoms have majority carriers as

asked Jan 27, 2014 by meena.p

1 answer

Fermi energy is

asked Jan 27, 2014 by meena.p

1 answer