The random motion of holes and free electrons due to thermal agitation is called ……….

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Answer :

The random motion of holes and free electrons due to thermal agitation is called Diffusion.

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________ is an electric noise produced by thermal agitation of electrons in conductor and semiconductor. A. External noise B. Internal noise C. Thermal noise D. Flicker

Description : ________ is an electric noise produced by thermal agitation of electrons in conductor and semiconductor. A. External noise B. Internal noise C. Thermal noise D. Flicker

Last Answer : C. Thermal noise

Noise caused by the thermal agitation of electrons in resistance. A. All of these B. Thermal noise C. Johnson’s noise D. White noise

Description : Noise caused by the thermal agitation of electrons in resistance. A. All of these B. Thermal noise C. Johnson’s noise D. White noise

Last Answer : A. All of these

In an intrinsic semiconductor, the number of free electrons ………

Last Answer :  In an intrinsic semiconductor, the number of free electrons Equals the number of holes.

(2) experience collision less frequently Explanation: When an electric field is applied, both the valence electrons and the free electrons move in the same direction. The hole direction is opposite to that of valence electron but the mobility is the same. Even for the same electric field, valence electrons cannot move as freely as the free electrons because its movement is restricted due to collisions. Therefore, the velocity of valence electrons is less compared to free electrons. In other words, the velocity of holes is less compared to free electrons. This means mobility is also less for a hole compared to free electron.

Description : (2) experience collision less frequently Explanation: When an electric field is applied, both the valence electrons and the free electrons move in the same direction. The hole direction is opposite to that ... to free electrons. This means mobility is also less for a hole compared to free electron.

Last Answer : Carbon dioxide is called a greenhouse gas because - (1) its concentration remains always higher than other gases (2) it is used in photosynthesis (3) it absorbs infrared radiation (4) it emits visible radiation

Most internal noise comes from A. Shot noise B. Transit-time noise C. Thermal agitation D. Skin effect

Description : Most internal noise comes from A. Shot noise B. Transit-time noise C. Thermal agitation D. Skin effect

Last Answer : C. Thermal agitation

What is the reliable measurement for comparing amplifier noise characteristics? A. Thermal agitation noise B. Noise factor C. Noise margin D. Signal-to-noise

Description : What is the reliable measurement for comparing amplifier noise characteristics? A. Thermal agitation noise B. Noise factor C. Noise margin D. Signal-to-noise

Last Answer : B. Noise factor

Considered as the main source of an internal noise. A. Device imperfection B. Thermal agitation C. Temperature change D. Flicker

Description : Considered as the main source of an internal noise. A. Device imperfection B. Thermal agitation C. Temperature change D. Flicker

Last Answer : B. Thermal agitation

Power consumption during turbulent flow in agitation tank is proportional to the __________ of the liquid. (A) Viscosity (B) Thermal conductivity(C) Surface tension(D) Density

Description : Power consumption during turbulent flow in agitation tank is proportional to the __________ of the liquid. (A) Viscosity (B) Thermal conductivity (C) Surface tension (D) Density

Last Answer : (D) Density

A trivalent impurity has ….. valence electrons

Last Answer : A trivalent impurity has 3 valence electrons.

A pentavalent impurity has ………. Valence electrons

Last Answer : A pentavalent impurity has 5 Valence electrons.

The current through a metallic conductor is due to the motion of a. free electrons b. Protons c. Neutrons d. still under controversy

Description : The current through a metallic conductor is due to the motion of a. free electrons b. Protons c. Neutrons d. still under controversy

Last Answer : a. free electrons

(3) reflection of light due to the presence of free electrons Explanation: Lustre (or luster) is the way light interacts with the surface of a crystal, rock, or mineral. The word traces its origins back to the latin lux, meaning "light", and generally implies radiance, gloss, or brilliance. Metals in general have high electrical conductivity, high thermal conductivity, and high density. Typically they are malleable and ductile, deforming -under stress without cleaving.

Description : (3) reflection of light due to the presence of free electrons Explanation: Lustre (or luster) is the way light interacts with the surface of a crystal, rock, or mineral. The word ... conductivity, and high density. Typically they are malleable and ductile, deforming -under stress without cleaving.

Last Answer : Cloud is a colloidal dispersion of – (1) Air in a dispersion medium of water (2) Fog in a dispersion medium of water (3) Mist in a dispersion medium of air (4) Water drops in a dispersion medium of air

Electric current in a metal wire is due to the flow of — (1) Electrons (2) Protons (3) Ions (4) Holes

Description : Electric current in a metal wire is due to the flow of — (1) Electrons (2) Protons (3) Ions (4) Holes

Last Answer : (1) Electrons Explanation: A solid conductive metal contains mobile, or free electrons, originating in the conduction electrons. When a metal wire is connected across the two terminals of a DC ... the conductor are forced to drift toward the positive terminal under the influence of this field.

Conduction in metals is due to a) Electrons only b) Electrons and holes c) Holes only d) Applied electric field

Description : Conduction in metals is due to a) Electrons only b) Electrons and holes c) Holes only d) Applied electric field

Last Answer : a) Electrons only

The reverse current through semiconductor diode is due to (a) Minority carrier (b) majority carrier (c) electrons (d) holes

Description : The reverse current through semiconductor diode is due to (a) Minority carrier (b) majority carrier (c) electrons (d) holes

Last Answer : (a) Minority carrier

Forward current through a semi-conductor diode circuit is due to ________ (a) Minority carriers (b) majority carriers (c) holes (d) electrons

Description : Forward current through a semi-conductor diode circuit is due to ________ (a) Minority carriers (b) majority carriers (c) holes (d) electrons

Last Answer : (b) majority carriers

Electric current in a metal wire is due to the flow of— (1) Electrons (2) Protons (3) Ions (4) Holes

Description : Electric current in a metal wire is due to the flow of— (1) Electrons (2) Protons (3) Ions (4) Holes

Last Answer : Electrons

The majority charge carriers in p-type silicon are (A) Free electrons (B) Ions (C) Conduction electrons (D) Holes

Description : The majority charge carriers in p-type silicon are (A) Free electrons (B) Ions (C) Conduction electrons (D) Holes

Last Answer : Option D

Addition of trivalent impurity to a semiconductor creates many (A) holes. (B) free electrons. (C) valance electrons. (D) bound electrons.

Description : Addition of trivalent impurity to a semiconductor creates many (A) holes. (B) free electrons. (C) valance electrons. (D) bound electrons.

Last Answer : (B) free electrons.

The thermal noise is due to random

Last Answer : The thermal noise is due to random Motion of free electrons.

Diffusion due to thermal motion is called  a. dilation  b. infusion  c. effusion  d. dispersion

Description : Diffusion due to thermal motion is called  a. dilation  b. infusion  c. effusion  d. dispersion

Last Answer : effusion

The leakage current across a pn junction is due to …………..

Last Answer : The leakage current across a pn junction is due to Minority carriers.

In a semiconductor, current conduction is due to ……..

Last Answer : In a semiconductor, current conduction is due to Holes and free electrons.

Magnetism in materials is due to - (1) electrons at rest (2) circular motion of electrons (3) protons at rest (4) all neutrons at rest

Description : Magnetism in materials is due to - (1) electrons at rest (2) circular motion of electrons (3) protons at rest (4) all neutrons at rest

Last Answer : (2) circular motion of electrons Explanation: Myopia is commonly known shortsighted. It is a condition of the eye where the light that comes in does not directly focus on the retina but in ... most commonly correct myopia through the use of corrective lenses, such as glasses or contact lenses.

Magnetism in materials is due to (1) electrons at rest (2) circular motion of electrons (3) protons at rest (4) all neutrons at rest

Description : Magnetism in materials is due to (1) electrons at rest (2) circular motion of electrons (3) protons at rest (4) all neutrons at rest

Last Answer : circular motion of electrons

Fluid motion in the natural convection heat transfer between a solid surface and a fluid in contact with it, results from the (A) Existence of thermal boundary layer (B) Temperature gradient produced due to density difference (C) Buoyancy of the bubbles produced at active nucleation site (D) None of these

Description : Fluid motion in the natural convection heat transfer between a solid surface and a fluid in contact with it, results from the (A) Existence of thermal boundary layer (B) Temperature gradient produced ... difference (C) Buoyancy of the bubbles produced at active nucleation site (D) None of these

Last Answer : (D) None of these

In a single crystal of an intrinsic semiconductor, the number of free carriers at the Fermi level at room

Description : In a single crystal of an intrinsic semiconductor, the number of free carriers at the Fermi level at room temperature is: A) Half the total number of electrons in the crystal B) Zero C) Half the number of atoms in the crystal D) Half the number of free electrons in the crystal

Last Answer : In a single crystal of an intrinsic semiconductor, the number of free carriers at the Fermi level at room temperature is: Zero 

What are electrons and holes ?

Description : What are electrons and holes ?

Last Answer : Electrons are negatively charged particles and holes are positively charged. An electron does not bind to any covalent bond in a pure semiconductor when a quintile element is mixed . These electrons easily act ... creates a demand for an electron i.e. a hole which acts as a positive charge carrier.

What is the name of the area in a PN junction that has a shortage of electrons and holes?

Description : What is the name of the area in a PN junction that has a shortage of electrons and holes?

Last Answer : Depletion region

What is the name given to a piece of pure semiconductor material that has an equal number of electrons and holes?

Description : What is the name given to a piece of pure semiconductor material that has an equal number of electrons and holes?

Last Answer : Intrinsic.

In solid-state optical detectors, the excited charge is transported in the solid by ∙ a. Holes and protons ∙ b. Holes and electrons ∙ c. Anion and cation ∙ d. Protons and photons

Description : In solid-state optical detectors, the excited charge is transported in the solid by ∙ a. Holes and protons ∙ b. Holes and electrons ∙ c. Anion and cation ∙ d. Protons and photons

Last Answer : ∙ b. Holes and electrons

N-type region has majority charge carriers as (a) Holes (b) protons (c) neutrons (d) electrons

Description : N-type region has majority charge carriers as (a) Holes (b) protons (c) neutrons (d) electrons

Last Answer : (d) electrons

Minority carriers in N-type are a) Holes b) Electrons c) Neutrons d) Protons

Description : Minority carriers in N-type are a) Holes b) Electrons c) Neutrons d) Protons

Last Answer : a) Holes

The majority carriers in N-type substance are a) Holes b) Protons c) Neutrons d) Electrons

Description : The majority carriers in N-type substance are a) Holes b) Protons c) Neutrons d) Electrons

Last Answer : d) Electrons

In the N-type semiconductor the charge carries are a) Holes b) Neutrons c) Protons d) Electrons

Description : In the N-type semiconductor the charge carries are a) Holes b) Neutrons c) Protons d) Electrons

Last Answer : d) Electrons

In a P-type semiconductor the charge carriers are a) Electrons b) Holes c) Protons d) Neutrons

Description : In a P-type semiconductor the charge carriers are a) Electrons b) Holes c) Protons d) Neutrons

Last Answer : b) Holes

Barrier potential in a P-N junction is caused by (A) Thermally generated electrons and holes. (B) Diffusion of majority carriers across the junction. (C) Migration of minority carriers across the junction. (D) Flow of drift current.

Description : Barrier potential in a P-N junction is caused by (A) Thermally generated electrons and holes. (B) Diffusion of majority carriers across the junction. (C) Migration of minority carriers across the junction. (D) Flow of drift current.

Last Answer : (B) Diffusion of majority carriers across the junction.

In p-type semiconductor the majority carriers are (A) holes. (B) electrons. (C) positive ions. (D) negative ions.

Description : In p-type semiconductor the majority carriers are (A) holes. (B) electrons. (C) positive ions. (D) negative ions.

Last Answer : (A) holes.

The dominant charge carriers in p-type semiconductors are: w) neutrons x) electrons y) protons z) holes

Description : The dominant charge carriers in p-type semiconductors are: w) neutrons x) electrons y) protons z) holes

Last Answer : ANSWER: Z -- HOLES

In N-type semiconductors the majority of the carriers are: w) holes x) electrons y) protons z) neutrons

Description : In N-type semiconductors the majority of the carriers are: w) holes x) electrons y) protons z) neutrons 

Last Answer : ANSWER: X -- ELECTRONS

A P-type semiconductor is doped to produce one of the following. Will it produce: w) both holes and electrons x) positive electrons y) negative electrons z) holes

Description : A P-type semiconductor is doped to produce one of the following. Will it produce: w) both holes and electrons x) positive electrons y) negative electrons z) holes

Last Answer : ANSWER: Z -- HOLES

Conduction band electrons have more mobility than holes because they (1) are lighter (2) experience collision less frequently (3) have negative charge (4) need less energy to move them

Description : Conduction band electrons have more mobility than holes because they (1) are lighter (2) experience collision less frequently (3) have negative charge (4) need less energy to move them

Last Answer :  experience collision less frequently

The region consisting of holes and electrons near the p-n junction of a diode is

Description : The region consisting of holes and electrons near the p-n junction of a diode is (A) diffusion region (B) neutral zone (C) recombination region (D) depletion region 

Last Answer : The  region  consisting  of  holes  and  electrons  in a  pn  junction  is called  depletion layer.The  reason  being  both  holes  and  electrons have neutrolyzed at the  junction  thus  it  is depleated  with  delocalized  charge  carriers.

When an object undergoes thermal expansion,  a. any holes in the object expand as well  b. any holes in the object remain the same  c. mass increases  d. molecular activities would cease

Description : When an object undergoes thermal expansion,  a. any holes in the object expand as well  b. any holes in the object remain the same  c. mass increases  d. molecular activities would cease

Last Answer : any holes in the object expand as well

The random motion of particles suspended in a fluid is called: w) Boson Condensation x) Fermi Motion y) Brownian Motion z) Pauli Motion

Description : The random motion of particles suspended in a fluid is called: w) Boson Condensation x) Fermi Motion y) Brownian Motion z) Pauli Motion

Last Answer : ANSWER: Y -- BROWNIAN MOTION

Pick out the wrong statement. (A) 'Solvates' are chemical compounds formed by solute with their solvents. When water is the solvent, then it is called a 'hydrate' (B) In heat exchanger calculations (Δt) weighted is used in place of Δt, when it involves more than one sequence of heating or cooling i.e., desuperheating & condensation or condensation & sub-cooling (C) Heat transfer co-efficient during nucleate boiling is not influenced by the agitation imparted (D) In case of short tube vertical evaporators, area of central downtake is about 50 to 100% of the total tube cross-sectional area

Description : Pick out the wrong statement. (A) 'Solvates' are chemical compounds formed by solute with their solvents. When water is the solvent, then it is called a 'hydrate' (B) In heat exchanger ... vertical evaporators, area of central downtake is about 50 to 100% of the total tube cross-sectional area

Last Answer : (C) Heat transfer co-efficient during nucleate boiling is not influenced by the agitation imparted

The energy associated with the random motion of molecules or atoms within a substance is?

Description : The energy associated with the random motion of molecules or atoms within a substance is?

Last Answer : Thermal energy

Name the term used for mixing of different gases by random molecular motion and ferquent collision.

Description : Name the term used for mixing of different gases by random molecular motion and ferquent collision.

Last Answer : Name the term used for mixing of different gases by random molecular motion and ferquent collision.

Object moving along a circular path is A. in equilibrium B. not in equilibrium C. not moving with constant speed D. in random motion

Description : Object moving along a circular path is A. in equilibrium B. not in equilibrium C. not moving with constant speed D. in random motion

Last Answer : not in equilibrium