13/08/2024
*🔰 IMPORTANT Points 〽️*
*♦️Theses MCQS are From PMC and PMDC Past Papers♦️*
🔸Electron Volt is unite of electric energy.
🔹783Kev is the minimum electron energy in neutron beta decay.
🔸Proton and neutron are composed smaller particle called quark.
🔹Co_herent source of light means single wave length.
🔸Woolen cloths keep body warm bcz of bad conductivity.
🔹The open circuit test in a transformer is used to measure core loss.
🔸When bulb is turned on ohm's law is not applicable.
🔹If centripetal force is zero then centrifugal also zero.
🔸Negative of potential gradient is equal to electric intensity.
🔹if mass number increase density does not change.
🔸Acceleration in Simple pendulum is always negative to displacement.
🔹The Angular momentum of photon is zero.
🔸X_Rays used in crystallography to perform diffraction.
🔹Bone image is shown on X-rays photography bcz X-rays can be absorbed by bones.
🔸Mutual induction has a practical role in performance of transformer.
🔹When force is parallel to the direction of motion of the body,the work done is minimum.
🔸1st law of thermodynamics is special case of conservation of energy.
🔹In stationary wave the distance b/w adjacent node is equal to λ/2.
🔸An angular velocity of 60rpm is same as 2π rad/s.
🔹A star moving away from earth shows red shift.
🔸F=e(V×B)is valid for proton.
🔹photon cell is similar to photo electric effect.
🔸Alternating current generator use slip rings.
🔹The speed of sound in a metal is approximately 5000m/s.
🔸Platinum wire becomes yellow at 130 temperature.
🔹Plank's constant is analogous to angular momentum.
🔸A nucleus emits an alpha particle,followed by two beta particle the final nucleus will be an isotope of the original one.
🔹One redian means arc length of unit radius is unity.
🔸Red light photon has least momentum.
🔹For step down transformer Ns greater than Np.
🔸Basically potentiometer is a device for comparing two voltages.
🔹The existence of positron was discovered in cosmic radiation.
🔸Vs/A is unit of mutual inductance.
🔹B.dI=uI is expression of Ampere's law.
🔸IR radiation are used in green house effect.
🔹The role of Inductance is equal to inertia.
🔸volts/ampere =Ohm.
🔹For ideal step up transformer Ps=Pp.
🔸Fission and fusion both are example of renewable sources of energy.
🔹Perfect black body shows continuous spectrum.
🔸Half wave rectifier posses upper half cycle.
🔹the sum of absorption and transmission of light in a medium is equal to Incident light.
🔸Polarization explains that light is electric as well as magnetic in nature.
🔹Coulmb/volts=Farrad.
🔸The coupling co-efficient of perfectly coupled coil is one(1).
🔹Magnetic field density out side the solenoid is negligible.
🔸when object moving in a circle,the angle b/w linear velocity and position vector is 90°C.
🔹During Self Inductance number of turns varies as N^2.
🔸Energy of photon is directly proportional to frequency.
🔹Work done in a Isobaric process is given by Pdv.
🔸Angular velocity can not be infinite.
🔹Constant potential difference is required for establishing steady current.
🔸An arc of length equal to circumference of a circle subtends an angle of 2π radian.
🔹The angular displacement of an object after one complete revolution is "2π" redian.
🔸Radiations are classified by its ionizing and non-ionizing nature.
🔹In full wave rectifier ripple factor is less.
🔸electric field lines due to a positive charge are radially away from the charge.
🔹Alpha rays used in smoke detectors.
🔸Wave nature of light is provided by polarization.
🔹Displacement of sun with respect to earth is "r".
🔸Instantaneous velocity is positive and negative.
🔹Work done by transition force in Simple pendulum is zero.
🔸Heavy metal used to detect radioactivity.
🔹Minimum energy required for pair production is 1.02Mev.
🔸Beats can be used to find frequency.
🔹The interference of green photon to red photon will cause no effect.
🔸Maximum power delivered by battery is Pmax=E^2/4r.
🔹Centrifuge is used to purify uranium.
🔸Momentum of photon is hf/c.
🔹Non-inverting amplifier circuits have very high input independence.
🔸Mass and energy are related to each other by Einstein law.
🔹The nuclear force is considered as strong force.
🔸Stationary Charge is not affected by magnetic field.
🔹Emf is equal to terminal potential difference when circuit is open.
🔸If we are standing in bus and driver applies a break then pseudo force pushes forward.
🔹According to Einstein mass energy are directly proportional.
🔸X-Rays is reverse process of photo electric effect.
🔹Momentum principle used in solar cells.
🔸Michelson measured the length of standard meter in terms of wave length of red candium light.
🔹Diode is non-ohmic resistor.
🔸Ripple factor of half wave rectifier is 1.21.
🔹Steady current does not change with time.
🔸Galvano meter is electro mechanical device.
🔹The principle behind the working of cathod rays osicilloscop is half wave rectifier.
🔸The value of angular momentum is maximum when angle is 90°.
🔹If pipe is closed at one end and open at other the closed end known as node.
🔸Work done on a ceiling fan by gravity is zero.
🔹The pe*******on power of x-rays depend upon frequency.
🔸The concept of work function was given by Einstein.
🔹Michelson determined velocity of light by using an octagonal rotating mirror.
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🔸Centre tape rectifier circuit consist of 200%diode.
🔹Varticle velocity vs time graph for a projectile motion varies linearly.
🔸one of the major reasons for heat loss in transformer is Eddy current loss.
🔹Pseudo current may be defined as accelerating frame of reference.
🔸The Speed of photon in vacuum is smaller then in liquid water.
🔹The root mean square value of alternating current is equal to(1 under root 4)times of the peak value.
🔸Gamma rays can not be produce by electronic transition.
🔹Beta particle is actually a fast moving electron.
🔸if Alpha,Beta and Gamma rays carry same momentum all have same wave length.
🔹Wave transport energy without transporting mattet.
🔸The angle b/w radius vector and centripetal acceleration is "π".
🔹There are zero quark in electron.
🔸if we make the magnetic field stronger the value of induce current is increase.
🔹Nuclear force is spin dependent but charge independent.
🔸The number of diode in bridge rectifier is four(4).
🔹For coil self_inductance is L and current is I then flux passing through it is LI.
🔸Charge and momentum both are conserved in pair production.
🔹Ripple factor is defined as Irms/Idc.
🔸power transformers have maximum efficiency at full load.
🔹Photon when scattered from mirror its momentum becomes double.
🔸R is the thermodynamic coordinate.
🔹Gamma rays shows comparable penetrating power to X-rays.
🔸Work done by friction can be positive or negative.
🔹Radiation exchange occurs in vacuum.
🔸An ideal reversible heat engine has highest efficiency.
🔹The voltage turns ratio in step_down transformer is 2:1.
🔸The insulation b/w sheets of transformer core is to get small Eddy current.
🔹Acceleration of earth around sun in its orbit is always tangential.
🔸Emf produced in generator is NwABcos(wt).
🔹If direction of field and area vector is opposite then field is negative.
🔸The value of Rydberg constant varies with atomic number as Z^2.
🔹Compton confirm existence of photon.
🔸Acceleration can be seen in rotating frame of reference.
🔹In Ultra violet region photon has highest energy.
🔸The resistance of super conductor is zero.
🔹Half-life is measured by Geiger Muller counter.
🔸Co_Herent sources are monochromatic sources which produce waves of constant phase difference.
🔹The fission reaction is slow reaction when neutrons slow down.
🔸According to wien's law temperature and wave length are inversely related.
🔹Value of current in short circuit is infinite.
🔸Spectral lines is like a finger print of absorbed or emission energy in a spectrum.
🔹In half wave rectification the diode conducts during positive half.
🔸The reverse process of pair production is known as annihilation of energy.
🔹Heavy water used to reduce the speed of fast moving neutron.
🔸The net force in an inertial frame is zero.
🔹The speed of sound in water is approximately 1500m/s.
🔸The resistance of human body is about 120k-ohm.
🔹Quarks are half spin particle.
🔸whene sound reflects back its known as echo sound.
🔹wave nature and particle nature of photon related to its momentum.
🔸In SONAR we use sound waves.
🔹Power remain unchanged in transformer.
🔸Projectile motion does not depend upon mass.
🔹The Alternating current can be converted into direct current by Rectification.
🔸Phosphorus-32 and strontium-90 used for skin cancer.
🔹Copper has low electrical resistivity.
🔸S.I unit of radioactivity is Becqueral.
🔹The speed of waves depend upon tension and mass per unit length of string.
🔸Very hot star emit blue colour.
🔹Projectile motion of object on earth always parabolic.
🔸Life time of an excited state is 10^-8s.
🔹1Rutherford is equal to 10^6becqueral.
🔸Atmosphere around the earth help by gravity.
🔹Momentum of white light is less than X-rays.
🔸Acceleration always positive for free falling body.
🔹H-atom can not produce Alpha rays.
🔸The black body which is close to perfect body is cavity radiator.
🔹S.I unit of Inductance is Henry.
🔸In stationary wave strain is maximum at node.
🔹Photocopier and ink-jet printer are applications of electrostatics.
🔸Temperature is defined by zeroth law of thermodynamics.
🔹The speed of sound in air is approximately 332m/s.
🔸Microscope uses shorter wavelength to reduce diffraction.
🔹The core of earth is hot due to frictional force.
🔸Centre tap rectifier circuit consist of 200%diode.
🔹Newtons 1st law falsified Aristotle theory.
🔸Angular frequency directly related to linear frequency.
🔹Breather is provided to transformer to absorb moisture of air during breathing.
🔸if number of loops increase than according to Faraday's law magnetic field,electric field and voltage also increase.
🔹The greek word"xeros and graphos means dry writing.
🔸Laser light is uni-directional.
🔹X-Rays were discovered in scattering experiment.
🔸Lenz law is in accordance with conservation of energy.
🔹Resistance of conductor depends upon length.
🔹A cycle tyres burst suddenly is an example of Adiabatic process.
🔸Molar mass of water is 0.108kg/mol.
🔹In A.C generator increase in number of turns in the coil increase emf.
🔸The electric potential at infinite distance zero.
🔹In fusion reaction of sun H isotopes are used.
🔸Alpha rays has highest charge.
🔹Young's double slit experiment support Huygen's wave theory.
🔸In Lorentz force magnetic force is deflecting force.
🔹The effect of nuclear bomb radiation lasts for more than 90years.
🔸In Compton scattering process wave length of scattered X-rays Increase.
🔹In stationary wave the distance between two consecutive crests is 1/2wavelength.
🔸In full wave rectifier with input frequency of 50Hz the ripple in output is mainly of the frequency of 100Hz.
🔹Pair production is possible in gamma ray
