The ratio of mass of proton to that of electron is nearly?
Last Answer : The ratio of mass of proton to that of electron is nearly 1840.
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112 views
1 answer
asked
Mar 25, 2018
by
anonymous

Explain with sketch electron beam welding.
Last Answer : Electron Beam Welding Process In EBW process, the heat is generated when the electron beam impinges on work piece. As the high velocity electron beam strikes the surfaces to be welded, their kinetic ... material that is directly in the path is melted which when solidifies form the joint.
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92 views
1 answer
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Jan 3, 2021
by
anonymous

State the different modes of electron emission in metal. Explain any two modes of emission.
Last Answer : Different modes of electron emission in metal - 1. Thermionic emission 2. Photo electric emission. 3. Field emission. 4. Secondary emission. Mode of Emission 1. Thermionic emission. ... (GaP) Application: Electron multiplier tubes, Special amplifying tubes, Computer memory tubes.
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123 views
1 answer
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Aug 5, 2019
by
anonymous
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In a metal conductor, what is a free electron?
Last Answer : When many atoms are close together in a copper wire, the outermost orbital electron of each copper atom can easily break free from its home or parent atom. These electrons then can migrate easily ... random. Such electrons that can move freely from one atom to the next are called free electrons.
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193 views
1 answer
asked
Jun 29, 2019
by
anonymous

The vertical deflection of an electron beam on the screen of a CRO is measured to be 8 mm. Now, the potential difference between the Y-plates is doubled, and simultaneously the pre-accelerating anode voltage is reduced to half of ... on the screen would become (A) 64 mm (B) 32 mm (C) 8 mm (D) 1 mm
Last Answer : The vertical deflection of an electron beam on the screen of a CRO is measured to be 8 mm. Now, the potential difference between the Y-plates is doubled, and simultaneously the pre-accelerating ... of its previous value. Then, the vertical deflection of the beam on the screen would become 32 mm
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127 views
1 answer
asked
Apr 28, 2018
by
anonymous

lf the wire which is vertical to this page has electron flow downwards the conductor will have
Last Answer : lf the wire which is vertical to this page has electron flow downwards the conductor will have a counter-clockwise field in the plane of the paper
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180 views
1 answer
asked
Apr 26, 2018
by
anonymous

Could the magnetic properties of a piece of negative mass only be realized around another piece of negative magnetic mass?
Last Answer : I think you need to define some terms here. What is negative magnetic mass ? I understand each of those words, but the combination into a phrase is essentially meaningless to me. Non-magnetic is a ... of yet. Although anti-matter has been postulated, I'm not aware of its provable existence yet.
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1 answer
asked
Mar 2
by
anonymous

What is the Difference between Mass and Weight?
Last Answer : Shown below are two types of scales commonly used in the classroom -a spring scale (left) and a simple balance beam scale on the right. On earth the spring scale reads 100g with an unknown mass ... spring scale read? How much mass would be needed to balance the 100g mass on the balance beam?
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1 answer

What is mass energy equivalence? Give one example. Define mass defect and binding energy.
Last Answer : Mass energy equivalence:- The physical principle that a measured quantity of energy is equivalent to a measured quantity of mass. The equivalence is expressed by Einstein's equation E = mc ... of energy that must be supplied to a nucleus to completely separate its nuclear articles (nucleons)
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1 answer
asked
Sep 7, 2018
by
anonymous

The mass of ions in grams which is liberated or deposited by chemical action by the passage of 1 C of electricity _______ A) electrochemical force B) electrochemical voltage C) electrochemical equivalent D) none of these
Last Answer : The mass of ions in grams which is liberated or deposited by chemical action by the passage of 1 C of electricity electrochemical equivalent
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106 views
1 answer
asked
Apr 29, 2018
by
anonymous

The units of moment of inertia of mass are?
Last Answer : Moment of inertia mass*velocity [Kg M T'-1]
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223 views
1 answer
asked
Mar 22, 2018
by
anonymous

How can the state of charge of battery is best indicated?
Last Answer : Ans. The state of charge of battery is best indicated by specific gravity of electrolyte and voltage.
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1 answer

A charge of 0.1 C moves past a given point every 0.01 s. How much is the current?
Last Answer : The current is 10.0A. 1ampere = 1 Coulomb per 1 second. 0.1Coulombs ÷ 0.01seconds = 10.0amperes.
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414 views
1 answer
asked
Jul 1, 2019
by
anonymous
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What is the output voltage of a battery if 10 J of energy is expended in moving 1.25 C of charge?
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259 views
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asked
Jul 1, 2019
by
anonymous

Briefly describe the electric field of a static charge.
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0 answers
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Jun 29, 2019
by
anonymous

Coulomb Siemens Farad Joule
Last Answer : Correct Answer: 1. Coulomb
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1 answer
asked
Jun 28, 2019
by
anonymous
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The state of charge of the battery is indicated by the electrolyte's : (A) mass (B) colour (C) viscosity (D) specific gravity
Last Answer : The state of charge of the battery is indicated by the electrolyte's : specific gravity
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62 views
1 answer
asked
Apr 29, 2018
by
anonymous

What is the charge on each capacitor when a 150 V is applied across two capacitors with values 5 μF and 10 μF, connected in series? A) 500 μC B) 0.5 μC C) 0.5 C D) None of these
Last Answer : What is the charge on each capacitor when a 150 V is applied across two capacitors with values 5 μF and 10 μF, connected in series? A) 500 μC B) 0.5 μC C) 0.5 C D) None of these
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100 views
1 answer
asked
Apr 29, 2018
by
anonymous

The minimum charge on an ion is?
Last Answer : The minimum charge on an ion is equal to the charge of an electron.
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265 views
1 answer
asked
Mar 25, 2018
by
anonymous

How do you charge a capacitor with a battery?
Last Answer : The capacitor is connected in parallel with the battery.
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123 views
1 answer
asked
Mar 15, 2018
by
anonymous

Why does charge flow from positive to negative?
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0 answers
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Mar 14, 2018
by
anonymous

How the charge Carriers are created?
Last Answer : Charge Carriers are created if the electrons is removed from atom .
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1 answer
asked
Sep 20, 2017
by
anonymous

The transferred electron bulk effect occurs in
Last Answer : The transferred electron bulk effect occurs in Gallium Arsenide
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227 views
1 answer
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May 23, 2018
by
anonymous

In any atom the potential energy of an orbiting electron is (A) always positive (B) always negative (C) sometime positive, sometime negative (D) numerically less then its kinetic energy.
Last Answer : In any atom the potential energy of an orbiting electron is always negative
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1 answer
asked
May 16, 2018
by
anonymous

In order to generate electron-hole pairs, the maximum wavelength of radiation for Silicon (Band gap = 1.1 eV) is (a) 1.88 μm (b) 1.68 μm (c) 1.13 μm (d) 1.54 μm
Last Answer : In order to generate electron-hole pairs, the maximum wavelength of radiation for Silicon (Band gap = 1.1 eV) is 1.13 μm
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152 views
1 answer
asked
May 15, 2018
by
anonymous

An electron is moving with a velocity of `10^(7) m s^(-1)`. Find its energy in electron volts. (Mass of electron `=9.1xx10^(-31) kg` and charge of ele
Last Answer : An electron is moving with a velocity of `10^(7) m s^(-1)`. Find its energy in electron volts. (Mass ... ` and charge of electron `=1.6xx10^(-19) C`)
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1 answer

What is the Particle in a nucleus of an atom it has a positive electrical charge and it's 2000 times the mass of the electron?
Last Answer : protonthere is no such thing as an electrical charged nut there issuch a thing as a charged particle, that is also known asneutron
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1 answer

The nuclear particle having no mass and no charge, but only spin is - (1) proton (2) neutrino (3) meson (4) electron
Last Answer : (2) neutrino Explanation: Neutrinos do not carry electric charge, and have mass quite small, though nonzero. Their mass is tiny even by the standards of subatomic particles. They are electrically neutral, weakly interacting elementary subatomic particles with half-integer spin.
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1 answer

In Rutherford's experiment involving the deflection of alpha particles by atomic nuclei, the fact that some of the alpha particles bombarding the thin gold foil were back-scattered, led to one of the ... its nucleus z) the nucleus of a gold atom occupies nearly the entire space of the atom
Last Answer : ANSWER: Y -- MOST OF THE MASS OF A GOLD ATOM IS IN ITS NUCLEUS
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1 answer
asked
Mar 12, 2021
by
anonymous

Alpha rays are different from beta rays in one of the following ways. Are they different since: w) alpha rays are deflected in a magnetic field and beta rays are not x) alpha rays are ... negative charge z) alpha rays are produced within the nucleus and beta rays are produced outside the nucleus
Last Answer : ANSWER: Y -- ALPHA RAYS HAVE A POSITIVE CHARGE AND BETA RAYS HAVE A NEGATIVE CHARGE
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1 answer
asked
Mar 9, 2021
by
anonymous

The nuclear particle having no mass and no charge, but only spin is (1) proton (2) neutrino (3) meson (4) electron
Last Answer : neutrino
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1 answer
asked
Jan 23, 2021
by
anonymous
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If an atom loses one or more electrons, it becomes _____.
Last Answer : It becomes positively charged atom.
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465 views
2 answers
asked
May 29, 2018
by
anonymous

The correct order of electromagnetic spectrum with decreasing frequency is: (1) Microwaves, Radiowaves, Infrared rays, Ultraviolet rays, X-rays (2) Radiowaves, Infrared rays, Ultraviolet rays, ... Radiowaves, Ultraviolet rays (4) X-rays, Ultraviolet rays, Infrared rays, Microwaves, Radiowaves
Last Answer : The correct order of electromagnetic spectrum with decreasing frequency is: (1) Microwaves, Radiowaves, Infrared rays, Ultraviolet rays, X-rays (2) Radiowaves, Infrared rays, Ultraviolet rays, ... Radiowaves, Ultraviolet rays (4) X-rays, Ultraviolet rays, Infrared rays, Microwaves, Radiowaves
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155 views
1 answer
asked
May 29, 2018
by
anonymous

Moving coil instruments have which one of the following scales ? (a) Logarithmic scale (b) Uniform scale (c) Non-uniform scale (d) Squared scale
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72 views
0 answers
asked
May 26, 2018
by
anonymous

Super conducting materials can be used for (a) ore refining. (b) magnetic levitation in high speed trains. (c) medical resonance imaging. (d) All of the above
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0 answers
asked
May 26, 2018
by
anonymous
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Ferrites are types of (a) magnetic material (b) conducting material (c) semiconducting material (d) insulating material
Last Answer : Ferrites are types of magnetic material.
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99 views
1 answer
asked
May 26, 2018
by
anonymous

In which material, valence electrons are tightly bounded to their parent atoms ? (a) Conductor (b) Semiconductor (c) Insulator (d) Magnetic
Last Answer : insulator(b)
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137 views
2 answers
asked
May 26, 2018
by
anonymous

If temperature of a pure silicon specimen is increased, then (a) only number of free electrons increase. (b) only number of free holes increase. (c) number of free holes and free electrons increases. (d) only number of free holes decrease.
Last Answer : Number of free holes and free electrons increases.
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281 views
1 answer
asked
May 25, 2018
by
anonymous

A silicon p-n junction at a temperature of 20 °C has a reverse saturation current of 10 pA. The reverse saturation current at 40 °C will approximately be (a) 30 pA (b) 40 pA (c) 50 pA (d) 60 pA
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80 views
0 answers
asked
May 25, 2018
by
anonymous

A material has conductivity of 10–2 mho/m and relative permittivity of 4. The frequency at which the conduction current in the medium is equal to the displacement current, is (a) 450 MHz (b) 900 MHz (c) 45 MHz (d) 90 MHz
Last Answer : C
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103 views
1 answer
asked
May 25, 2018
by
anonymous

Both donor and acceptor impurities are present in the combination of (a) Phosphorous - Arsenic (b) Aluminium - Antimony (c) Boron - Gallium (d) Arsenic - Antimony
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0 answers
asked
May 25, 2018
by
anonymous

A cable has an insulation of relative permittivity 2. If the insulation is replaced by one of relative permittivity 4, then capacitance of the cable (a) is doubled (b) is halved (c) remains unchanged (d) is reduced
Last Answer : B
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1 answer
asked
May 25, 2018
by
anonymous

Three materials X, Y and Z having relative permittivity 2.5, 3.0 and 4.0 respectively are used in a single core cable. The materials on inner most and outer most layer respectively should be (a) X and Y (b) Y and Z (c) X and Z (d) Z and X
Last Answer : Answer is option d Because the material with high relative permitivity should be used as the inner most layer of the cable,to withstand with the high currents flowing in the conductor
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352 views
1 answer
asked
May 25, 2018
by
anonymous

If temperature of a radiating body is 1500 °C, the wavelength at which maximum radiant energy occurs is (a) 2.87 µm (b) 1.63 µm (c) 1.01 µm (d) 20.85 µm
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246 views
0 answers
asked
May 25, 2018
by
anonymous

A compact microstrip antenna may be obtained by
Last Answer : A compact microstrip antenna may be obtained by cutting slot on the patch
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48 views
1 answer
asked
May 23, 2018
by
anonymous

Frequency is inherently a physical quantity with characteristics. a. Positive b. negative c. both a &b d. none of above
Last Answer : Frequency is inherently a physical quantity with characteristics. Positive
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290 views
1 answer
asked
May 17, 2018
by
anonymous

The degree of coupling depends (A) size of hole (B) location of holes (C) size and location of holes (D) not depend on size or location of hole
Last Answer : The degree of coupling depends location of holes
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76 views
1 answer
asked
May 17, 2018
by
anonymous

Form the hot metal surface electrons escape because (A) of change of state from metal to gas due to heat. (B) of change of state from gas to metal (C) the energy supplied is greater than the work function (D) the energy is greater than Fermi level
Last Answer : Form the hot metal surface electrons escape because the energy supplied is greater than the work function
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67 views
1 answer
asked
May 17, 2018
by
anonymous

At a particular temperature and current density, the critical magnetic field for a Type I superconductor is Bc and that for a type II superconductor ranges from Bc1 to Bc2 keeping other ... will switch to the normal conducting state, while Type II superconductor will maintain a vortex sate
Last Answer : At a particular temperature and current density, the critical magnetic field for a Type I superconductor is Bc and that for a type II superconductor ranges from Bc1 to Bc2 keeping other ... will switch to the normal conducting state, while Type II superconductor will maintain a vortex sate
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104 views
1 answer
asked
May 15, 2018
by
anonymous
