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Physics-

General

Easy

Question

The valence band and conduction band of a solid overlap at low temperature, the solid may be

A metal
A semiconductor
An insulator
None of these

The correct answer is: A metal

In conductors valence band and conduction band overlaps.

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In a P-type semiconductor, germanium is doped with

In a P-type semiconductor, germanium is doped with

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The impurity atom added to germanium to make it N-type semiconductor is

The impurity atom added to germanium to make it N-type semiconductor is

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If $N subscript P end subscript$ and $N subscript e end subscript$ be the numbers of holes and conduction electrons in an extrinsic semiconductor, then

If $N subscript P end subscript$ and $N subscript e end subscript$ be the numbers of holes and conduction electrons in an extrinsic semiconductor, then

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When Ge crystals are doped with phosphorus atom, then it becomes

When Ge crystals are doped with phosphorus atom, then it becomes

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A piece of copper and the other of germanium are cooled from the room temperature to 80 K, then which of the following would be a correct statement

A piece of copper and the other of germanium are cooled from the room temperature to 80 K, then which of the following would be a correct statement

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Bonding in a germanium crystal (semi- conductor) is

Bonding in a germanium crystal (semi- conductor) is

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What is the coordination number of sodium ions in the case of sodium chloride structure

What is the coordination number of sodium ions in the case of sodium chloride structure

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The expected energy of the electrons at absolute zero is called

The expected energy of the electrons at absolute zero is called

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If the series limit of Lymen series for Hydrogen atom is equal to the series limit of Balmer series for a hydrogen like atom, then atomic number o this hydrogen like atom will be

If the series limit of Lymen series for Hydrogen atom is equal to the series limit of Balmer series for a hydrogen like atom, then atomic number o this hydrogen like atom will be

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Consider an initially pure M gm sample of ^AX, an isotope that has a half life of T hour, what is it’s initial decay rate (N_A= Avogrado No.)

Consider an initially pure M gm sample of ^AX, an isotope that has a half life of T hour, what is it’s initial decay rate (N_A= Avogrado No.)

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Nuclear fission can be explained based on

Nuclear fission can be explained based on

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$text If end text c o s invisible function application 25 to the power of ring operator end exponent plus s i n invisible function application 25 to the power of ring operator end exponent equals$ K_t then cos $20 to the power of ring operator end exponent$ equal to

$text If end text c o s invisible function application 25 to the power of ring operator end exponent plus s i n invisible function application 25 to the power of ring operator end exponent equals$ K_t then cos $20 to the power of ring operator end exponent$ equal to

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$text If end text c o s to the power of 2 end exponent invisible function application x plus c o s to the power of 4 end exponent invisible function application x equals 1 text , then the value of end text t a n to the power of 4 end exponent invisible function application x plus c o t to the power of 4 end exponent invisible function application x plus t a n to the power of 2 end exponent invisible function application x minus c o t to the power of 2 end exponent invisible function application x text is equal to end text$

$text If end text c o s to the power of 2 end exponent invisible function application x plus c o s to the power of 4 end exponent invisible function application x equals 1 text , then the value of end text t a n to the power of 4 end exponent invisible function application x plus c o t to the power of 4 end exponent invisible function application x plus t a n to the power of 2 end exponent invisible function application x minus c o t to the power of 2 end exponent invisible function application x text is equal to end text$

If cot $theta equals fraction numerator square root of m plus square root of n over denominator square root of m minus square root of n end root end fraction$ ,then $left parenthesis m plus n right parenthesis$ cos $2 theta$ is equal to

If cot $theta equals fraction numerator square root of m plus square root of n over denominator square root of m minus square root of n end root end fraction$ ,then $left parenthesis m plus n right parenthesis$ cos $2 theta$ is equal to

On bombarding $U to the power of 235 end exponent$ by slow neutrons, 200MeV energy is released. If the power output of atomic reactor is 1.6 MW, then the rate of fission will be

On bombarding $U to the power of 235 end exponent$ by slow neutrons, 200MeV energy is released. If the power output of atomic reactor is 1.6 MW, then the rate of fission will be

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