FSC Physics important MCQ's ~ Science Physics

FSC Physics important MCQ's

1^st Year

· Value of "g" remains constant in the range of 1km.

· Area under v-t graph gave distance.

· F net=0, ∆a=0, ∆v does not equal to zero. The body will move with constant velocity.

· When a triangle have two sides equal then there angle will also be equal.

· Increase in K.E=4 times Momentum=? P=√2mE P= 2 times

· Every declaration is not retardation acceleration but every retardation acceleration is deceleration.

· Rocket propulsion involved Newton's 3rd law of Motion.

· In Equation of motion, the acceleration is uniform.

· One second is defined as 9192631770 periods of Cesium clock.

· The magnitude of dot product and cross product will be same at 45° and 225°.

· In stationary wave pressure is maximum at node and minimum at anti-node.

· For Resonance; I- Amplitude large ii- Frequencies match iii- Response must

· Speed of sound in; I- solid 5000m/S ii- liquid 1500m/s iii- Gas 332m/s and vacuum zero.

· Sound waves cannot be polarized because they are Longitudinal Waves.

· Human ear can listen20Hz-20000HzInfrasonic< 20Hz and 20000Hz<Ultrasonic

· Same medium. Different medium=f x lambda. V= f x lambda remains constant. f remains constant. Diffraction. Refraction

· Speed of sound depends upon; I- pressure ii- increase in temp iii- molecular weight

· The wave which start from extreme position called cosine wave.

· Sine wave starts from mean position.

· Pyrometer used to measure pressure and Barometer used for high and low pressure.

· For a satellite orbiting around earth P.E is greater than K.E.

· Dyrometer:- Energy measurements.

· K.E is inversely proportional to moment of inertia.

· Acceleration describes path motion followed by body.

· No. Of beats per second= Diff of frequencies (beats)

· S.H.M is a type rectilinear motion.

· Linear Magnification M= infinite

· Resolving power inversely proportional to wavelength and directly proportional to Diameter.

· In YDSE wave front divided.

· Distance b/w object and its real image formed by convex lens cannot be less than 4f.

· At the point of contact of lens and glass plate thickness is zero. That’s why Newton's center is dark.

· When object is placed B/w principle axis and focus image is erect, virtual and enlarge.

·        When water heat 0° - 4° volume decrease5°- 100° volume increases.
·        CNG engine efficiency= 18%Petrol engine=25%Disel engine =40-45%
·        Change in entropy in adiabatic is zero.
·        We cannot see through the fog due to scattering.
·        Scattering inversely proportional to wavelength.41. Response for yellow-green light human eye is 5500A°.
·        Intensity becomes half after polarization.
·        Stars seems twinkle due to different refractive index in atmosphere of earth.
·        Newton's rings formed due to interference.
·        Total internal reflection conditions; I- Denser to rare. Ii- incidence angle > critical angle.
·        Entropy of gases is greater than the solids.
·        Real gases can obey gas law for High temp and low pressure.

2^nd Year

· When electrons removed from neutral metal electric charge on it is +1.6C

· Metal cannot be used as electric medium B/w plates of capacitor.

· A charged conductor has charge on its outer surface.

· Glass has loosely bounded electrons.

· Glass used B/w parallel plate capacitor to increase capacitance.

· Work done in carrying a unit charge b/w two points on an equipotential is zero.

· Flux density is a vector quantity.

· Tensor is a quantity which have different values in different directions.

· Mass of Alpha particle is 4 times of mass of proton.

· Charge on alpha particle is 2 times of proton.

· A device is non ohmic its resistance is dynamic.

· A hollow charged surface does not produce E at internal.

· When supply us given to a transfer its output voltage is zero volt.

· The electrical circuit used to get smooth D.C output for a rectifier is called Filter.

· A hot body will radiate maxi energy if its surface is Black and rough.

· Diode can't perform amplification because it is a two terminal device.

· A choke coil have high inductance and low resistance. It control current due to Lenz's law.

· The value of A.C produces heat is called virtual value.(Ch # 16 article before three phase)

· In Hysteresis magnetizing current leads the magnetism.

· Potential drop not depend upon temp.

· A fast reactor does not use a moderator. i.e. Uranium does not need a moderator.

· Lyman series lies in both absorption and emissions.

· Compound micro scope theory explained by liquid drop theory.

· Fusion reaction is a source of energy in Hydrogen bomb and sun.

· Fission reaction produces energy 0.9MeV per nucleon.

· Fusion reaction produces energy 6MeV per nucleon.

· A photon is always considers to moving with speed of light.

· Lepton’s are electron , neutrino and anti-neutrino.

· Proton and neutron are called nucleon.

· The meaning of negative energy in a system indicate Bound energy.

· Gamma particles are more penetrating but alpha are most dangerous for body.

· Entering Flux is +ve and outgoing flux is -ve.

· Ohm's law is only applicable to conductors.

· Drift velocity cannot be increased by temp.

· Magnetic field toward reader shows by X (outward).

· Because of ionization of salt conductivity increases ( last year this was appeared in ECAT).

· Current obtained by generator is displacement current.

· The conductivity of super conductor is infinite.

· Energy stored in chook coil in the form of magnetic energy.

· The best materiel for core of transformer is soft iron.

· The energy produced in fusion reaction is 6 times more than a fission reaction.

· Fusion takes place on earth only in Hydrogen bomb.

· An op-amp consists of total 5 terminals.

· Neutrons are more damaging for eyes.

· Laser is used in micro surgery.

· Fission reaction was discovered by two German scientists who Ottottann and Strassman in 1939

· Einstein photoelectric effect base upon conservation of mass.

· Nuclear forces are short range and charge independent.

· Penetrating power of X rays can be increased by frequency.

· D.C have zero Frequency.

· Good materiel for making Electro magnet is Iron.

· Admittance is reciprocal of impedance.