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What is the meissner effect?
In case of normal material,the magnetic lines of force can penetrate the material,but in case of superconductor material the magnetic lines of forces repels from the material.Since superconductor materials have dimagnetic property.This effect is called meissner effect.
What properties does ozone have that oxygen does not?
Ozone is a molecule made up of three oxygen atoms, whereas oxygen is composed of two oxygen atoms. Ozone is a much more reactive and unstable gas compared to oxygen. Ozone has a distinct pungent odor and can cause respiratory irritation in high concentrations, which oxygen does not.
What is the valance bond theory?
Valence Bond Theory: • A discussion of valence bond theory is based on the knowledge of atomic orbitals, electronic configuration of elements, overlap criteria of atomic orbitals and principles of variation and superposition. • Orbital Overlap Concept of Covalent Bond: When two atoms approach each other, partial merger of two bonding orbitals, known as overlapping of the orbitals occurs. • Depending upon the type of overlapping, the covalent bonds may be divided as sigma (H) bond and Pi ( p ) bond. • Sigma (H) bond: This type of covalent bond is formed by the end to end (hand on) overlapping of bonding orbitals along the inter-nuclear axis. The overlap is known as head on overlap or axial overlap. The sigma bond is formed by any one of the following types of combinations of atomic orbitals. Sigma (H) bond can be formed by - s overlapping, s - p overlapping, p - p Overlapping etc. • Pi ( p ) Bond: This type of covalent bond is formed by the sidewise overlap of the half- filled atomic orbitals of bonding atoms. Such an overlap is known as sidewise or lateral overlap. 42. Hybridization: • In order to explain characteristic geometrical shapes of polyatomic molecules concept of hybridization is used. • The process of intermixing of the orbitals of slightly different energies so as to redistribute their energies resulting in the formation of new set of orbitals of equivalent energies and shape. 43. Atomic orbitals used in different types of hybridization. Shapes of molecules/ions
What are the colors of ozone?
Ozone is a pale blue gas. It is dimagnetic in nature.
What is definition of paramagnetic and dimagnetic materials?
A dimagnetic material produces a magnetic field that opposes an external field. A paramagnetic materia, on the other hand, produces a magnetic field that increases an external field. Dimagnetism and paramagnetism are induced when an object is placed in a magnetic field.
Is Nickel Paramagnetic Or Dimagnetic?
Nickel is typically considered paramagnetic due to the presence of unpaired electrons that align with an external magnetic field, causing attraction. However, in certain conditions such as high temperatures or strong magnetic fields, nickel can exhibit some degree of diamagnetism due to induced currents that create a repulsive force.
What is the meissner effect?
In case of normal material,the magnetic lines of force can penetrate the material,but in case of superconductor material the magnetic lines of forces repels from the material.Since superconductor materials have dimagnetic property.This effect is called meissner effect.
If copper 2 is paramagnetic what would you classify copper 1 as?
Copper 1 would be classified as diamagnetic, as it has all of its electrons paired in its orbital. Unlike paramagnetic materials that have unpaired electrons and are attracted to a magnetic field, diamagnetic materials have all paired electrons and are weakly repelled by a magnetic field.
What properties does ozone have that oxygen does not?
Ozone is a molecule made up of three oxygen atoms, whereas oxygen is composed of two oxygen atoms. Ozone is a much more reactive and unstable gas compared to oxygen. Ozone has a distinct pungent odor and can cause respiratory irritation in high concentrations, which oxygen does not.
Color of ozone?
Ozone (O3)is called an allotrope of oxygen and consists of three oxygen atoms. The color of ozone gas is lilac/bluish because the gas has a weak absorption in yellow and orange. Fluid ozone is bluish black, solid ozone is violet black.Oxygen (O2) is a colorless gas, fluid and solid oxygen have a pale blue color.
What are magnetic substances?
Magnetic substances are substances containing aligned dipoles. Dipoles are spinning electrons. In order for something to be magnetic, its dipoles must be aligned with each other, so that they face the same direction. The direction they face create a North end, while the opposite end creates a South end.Some substances, known as ferromagnetic substances, have permanently aligned dipoles. Other substances, such as paramagnetic and dimagnetic substances, require an external magnetic field to align, or 'induce' the dipoles of the substance.To conclude, magnetic substances contain dipoles which are permanently aligned, or can be aligned through the force of external magnetic fields.Diamagnetic Substances are those Substances there is no resultant field as the magnetic field produce by both the spin and orbital motions of the electrons might add up to zero.
What is the valance bond theory?
Valence Bond Theory: • A discussion of valence bond theory is based on the knowledge of atomic orbitals, electronic configuration of elements, overlap criteria of atomic orbitals and principles of variation and superposition. • Orbital Overlap Concept of Covalent Bond: When two atoms approach each other, partial merger of two bonding orbitals, known as overlapping of the orbitals occurs. • Depending upon the type of overlapping, the covalent bonds may be divided as sigma (H) bond and Pi ( p ) bond. • Sigma (H) bond: This type of covalent bond is formed by the end to end (hand on) overlapping of bonding orbitals along the inter-nuclear axis. The overlap is known as head on overlap or axial overlap. The sigma bond is formed by any one of the following types of combinations of atomic orbitals. Sigma (H) bond can be formed by - s overlapping, s - p overlapping, p - p Overlapping etc. • Pi ( p ) Bond: This type of covalent bond is formed by the sidewise overlap of the half- filled atomic orbitals of bonding atoms. Such an overlap is known as sidewise or lateral overlap. 42. Hybridization: • In order to explain characteristic geometrical shapes of polyatomic molecules concept of hybridization is used. • The process of intermixing of the orbitals of slightly different energies so as to redistribute their energies resulting in the formation of new set of orbitals of equivalent energies and shape. 43. Atomic orbitals used in different types of hybridization. Shapes of molecules/ions
Do you have bsnl tta old question papers?
BSNL TTA 2008 Sample PapersIf the voltage applied across a capacitance is triangular in waveform then the waveform of the current is-a) Triangularb) Trapezoidalc) Sinusoidald) RectangularAnswer is :- Rectangular1. One of the following statement which is true for relative dielectric constant is -a) It is dimensionlessb) It is not equal to unity for vacuumc) It?s value for all substances is less than oned) NoneAnswer is :- It is dimensionless2. Pure metals generally have-a) high conductivity and low temperature coefficientb) high conductivity and large temperature coefficientc) low conductivity and zero temperature coefficientd) low conductivity and high temperature coefficientAnswer is :- high conductivity and large temperature coefficient3. For small size, high frequency coils, the most common core material isa) Airb) Ferritec) Powdered iond) SteelAnswer is :- Air4. For an abrupt junction Varactor diode, the dependence of device capacitance (C) on applied reverse bias (V) is given by-a) C a V1/3b) C a V-1/3c) C a V1/2d) C a V-1/2Answer is :- C a V-1/35. A superconductor is a-a) A material showing perfect conductivity and Meissner effect below a critical temperatureb) A conductor having zero resistancec) A perfect conductor with highest dimagnetic susceptibilityd) A perfect conductor which becomes resistive when the current density through it exceeds a critical valueAnswer is :-A material showing perfect conductivity and Meissner effect below a critical temperature6. When a semiconductor based temperature transducer has a temperature coefficient of ?2500 mV/0C then this transducer is indeed a-a) Thermistorb) Forward biased pn junction diodec) Reverse biased pn junction dioded) FETAnswer is :- Forward biased pn junction diode7. The location of lightning arrestor is -a) Near the transformerb) Near the circuit breakerc) Away from the transformerd) NoneAnswer is :- Near the transformer8. Time constant of an RC circuit increases if the value of the resistance is -a) Increasedb) Decreasedc) Neither a nor bd) Both a and bAnswer is :- Increased9. Intrinsic semiconductors are those which -a) Are available locallyb) Are made of the semiconductor material in its purest fromc) Have more electrons than holesd) Have zero energy gapsAnswer is :- Are made of the semiconductor material in its purest from10. The primary control on drain current in a JFET is exerted by -a) Channel resistanceb) Size of depletion regionsc) Voltage drop across channeld) Gate reverse biasAnswer is :- Gate reverse bias11. The electrical conductivity of metals which is expressed in ohm-1 m-1 is of the order of -a) 1010b) 105c) 10-4d) 10-6Answer is :- 10512. When biased correctly, a zener diode ?a) acts as a fixed resistanceb) has a constant voltage across itc) has a constant current passing through itd) never overheatsAnswer is :- has a constant voltage across it13. The current amplification factor adc is given by ?a) IC/IEb) IC/IBc) IB/ICd) IB/ICAnswer is :- IC/IE14. Compared to bipolars, FETs have-a) high input impedanceb) low input impedancec) same input impedanced) noneAnswer is :- high input impedance15. The source-drain channel of JFET is -a) ohmicb) bilateralc) unilaterald) both a and bAnswer is :- both a and b16. diac is equivalent to a -a) Pair of SCRsb) Pair of four layer SCRsc) Diode and two resistorsd) Triac widthAnswer is :- Pair of four layer SCRs17. When a sample of N type semiconductor has electron density of 6.25 ? 1011 /cm3 at 300K and if the intrinsic concentration of carriers in this sample is 2.5 ? 1013/cm3 then the hole density will be ?a) 106/cm3b) 103/ cm3c) 1010/ cm3d) 1012/ cm3Answer is :- 103/ cm318. The statement ?In any network of linear impedances, the current flowing at any point is equal to the algebraic sum of the currents caused to flow at that point by each of the sources of emf taken separately with all other emf?s reduced to zero? represents -a) Kirchhoff?s lawb) Norton?s theoremc) Thevenin?s theoremd) Superposition theoremAnswer is :- Superposition theorem19. One of the following modes which has the characteristics of attenuation becoming less as the frequency is increased and is attractive at microwave frequencies of circular cylindrical wave guides is ?a) TE1 modeb) TM01 modec) TE01 moded) Higher order modeAnswer is :- TE01 mode20. A two-port network is symmetrical if ?a) z11z22 ? z12z21 = 1b) h11h22 ? h12h21 = 1c) AD ? BC = 1d) y11y22 ? y12y21 = 1Answer is :-AD ? BC = 121. For transmission line load matching over a range of frequencies, it is best to use a-a) balunb) broad band directional couplerc) double stubd) single stub of adjustable positionAnswer is :- double stub22. The poles and zeros of a driving point function of a network are simple and interlace on the negative real axis with a pole closest to the origin. It can be realised -a) by an LC networkb) as an RC driving point impedancec) as an RC driving point admittanced) only by an RLC networkAnswer is:- only by an RLC network23. Poles and zeros of a driving point function of a network are simple and interlace on the jw axis. The network consists of elements ?a) R and Cb) L and Cc) R and Ld) R, L and CAnswer is :- L and C24. For a two port reciprocal network, the output open circuit voltage divided by the input current is equal to ?a) Bb) Z12c) ?d) h12Answer is :- Z1225. In a short electric doublet the radiation properties are so that-a) The induction field diminishes as the square root of the distance and is only appreciable in the vicinity of the conductor.b) In the radiation, magnetic field is minimum when the current is maximum.c) The radiation resistance of a short doublet antenna is extremely high.d) Mean rate of power through a unit area of spherical sphere surrounding this doublet is proportional to the square of the elemental length, other factors remaining constant.Answer is :-Mean rate of power through a unit area of spherical sphere surrounding this doublet is proportional to the square of the elemental length, other factors remaining constant.For more Questions please visit www.solvedquestionpapers.com
Why are some metals magnetic and some are not?
There is no necessary relationship between metals and magnets. Some metals and non-metals are attracted to magnets, while others aren't. Different materials have different characteristics, which vary not only depending on their elemental composition, but also their structure. Even frogs can be magnetized if you try hard enough. Furthermore, the term "magnet" is not specific enough to answer this question. There are ferromagnetic materials, ferrimagnetic materials, paramagnetic materials, dimagnetic materials, electromagnets, etc, all of which work differently.
