Physics Section 12


  • Forward current in a semiconductor diode circuit is due to majority carriers.
  • The donor impurity among the options is antimony.
  • The arrow in the transistor schematic symbol is located on the emitter.
  • In full wave rectification, the output D.C. voltage across the load is obtained for the complete cycle of input A.C.
  • In half-wave rectification, the output D.C. voltage is obtained across the load for the positive half cycle of A.C.
  • The device used for converting D.C. to A.C. is called an inverter.
  • Specially designed semiconductor diodes used as fast counters are photo diodes.
  • Alternating voltage is an example of an analogue waveform.
  • An operational amplifier is a high gain amplifier.
  • To obtain an n-type semiconductor germanium crystal, it must be doped with foreign atoms of valency 5.
  • The operation of a transistor does not require heating of any part (emitter, base, or collector).
  • Non-inverting amplifier circuits have a very high input impedance.
  • An OP-AMP comparator compares the signal voltage on one input with a reference voltage on the other.
  • The working of a transistor as an amplifier is similar to a triode vacuum tube.
  • To obtain a p-type semiconductor Si crystal, it must be doped with foreign atoms of valency 3.
  • In a half-wave rectifier, the r.m.s. value of the A.C. component of the wave is more than the D.C. value.
  • In forward bias, the width of the potential barrier decreases.
  • Electronic circuits that implement logic operations are called logic gates.
  • Acceptor and donor impurities donate p-carriers and n-carriers, respectively.
  • An OP-AMP can amplify A.C.
  • The rectangular voltage is an example of a digital waveform.
  • The centripetal acceleration produced in a rotating body is commonly due to changes in direction.
  • Gravitation force of the moon is 1.62 m/s².
  • Farad is the unit of capacitance.
  • The speed of light is minimum while passing through glass.
  • A stone thrown from the top of a tall building follows a path that is parabolic.
  • The least count of a Vernier caliper containing 10 Vernier scale divisions is 0.1mm.
  • The core of a transformer is laminated to reduce energy losses due to eddy currents.
  • The symbol of the prefix used for Mega is M.
  • The efficiency of the Carnot engine working between 150°C and 50°C is 23.6%.
  • A piece of copper and a piece of germanium are cooled from room temperature to 77 K; the resistance of copper decreases and that of germanium increases.
  • How many electrons per second constitute a current of one micro ampere? 6.25 × 10^12 electrons.
  • In bringing an electron towards another electron, the electrostatic potential energy of the system increases.
  • The surface density of charge on a cube with a side of 5 cm and a charge of 6 C is 240 C/m².
  • The process in which entropy remains constant is called isochoric.
  • The effect based on the sudden expansion of gases is the Joule-Thomson effect.
  • Rutherford’s atomic model could not explain the behavior of electrons.
  • The unit of capacitance is the farad.
  • The speed of light is minimum while passing through glass.
  • The force applied on a body through a string is called tension.
  • The pioneers of physics were the Greeks.
  • The SI unit having the symbol “cd” is candela.
  • The centripetal acceleration produced in a rotating body is commonly due to a change in direction.
  • The efficiency of the Carnot engine working between 150°C and 50°C is 23.6%.
  • The mass-energy relation is the outcome of the special theory of relativity.
  • A stone thrown from the top of a tall building follows a parabolic path.
  • A force on a particle is conservative if its work depends on the end points of every motion, not on the path between.
  • Electric current in a solid metal conductor is caused by the movement of electrons.
  • The core of a transformer is laminated to reduce energy losses due to eddy currents.
  • The value of self-inductance is 5 mH.
  • Two parallel beams of positrons moving in the same direction will repel each other.
  • The resistance of copper decreases, and that of germanium increases when cooled from room temperature to 77 K.
  • The process in which entropy remains constant is isochoric.
  • The process in which all the heat supplied is converted into work done is isothermal.
  • The least count of Vernier caliper is 0.1 mm.
  • Electric current in a solid metal conductor is caused by the movement of electrons.
  • The turning effect of force is called torque.
  • The unit of capacitance is the farad.
  • Oil rises up the wick in a lamp due to capillary action.
  • Newton’s Third Law of Motion states that every action has an equal and opposite reaction.
  • The medium that sends a signal from the source to the destination is known as the transmission channel.
  • The Joule-Thomson effect is based upon sudden expansion of gases.
  • Rutherford’s atomic model could not explain the behavior of electrons.
  • Mach number is used in connection with the speed of aircraft.
  • The mass-energy relation is the outcome of the special theory of relativity.
  • The acceleration produced in a rotating body is due to a change in direction.
  • Gravitation force of Earth is 9.80 m/s².
  • Gravitation force of the Sun is 274 m/s².
  • Gravitation force of the Moon is 1.62 m/s².
  • A force applied on a body through a string is called tension.
  • The instrument suitable to measure the internal diameter of a test tube is Vernier Callipers.
  • The efficiency of the Carnot engine working between 150°C and 50°C is 23.6%.
  • The unit of capacitance is the farad.
  • The speed of light is minimum while passing through glass.
  • A stone thrown from the top of a tall building follows a parabolic path.
  • A force on a particle is conservative if its work depends on the end points of every motion, not on the path between.
  • Electric current in a solid metal conductor is caused by the movement of electrons.
  • The process in which entropy remains constant is isochoric.
  • The core of a transformer is laminated to reduce energy losses due to eddy currents.
  • The value of self-inductance is 5 mH.
  • Two parallel beams of positrons moving in the same direction will repel each other.
  • The resistance of copper decreases, and that of germanium increases when cooled from room temperature to 77 K.
  • The process in which entropy remains constant is isochoric.
  • The electrostatic potential energy of a system increases when bringing an electron towards the second electron.
  • The electrostatic potential energy of a system increases when bringing an electron towards the second electron.
  • The electrostatic potential energy of a system increases when bringing an electron towards the second electron.
  • The electrostatic potential energy of a system increases when bringing an electron towards the second electron.
  • The process in which entropy remains constant is isochoric.
  • The process in which all the heat supplied is converted into work done is isothermal.
  • The least count of Vernier caliper is 0.1 mm.
  • Electric current in a solid metal conductor is caused by the movement of electrons.
  • The turning effect of force is called torque.
  • The unit of capacitance is the farad.
  • Oil rises up the wick in a lamp due to capillary action.
  • Newton’s Third Law of Motion states that every action has an equal and opposite reaction.
  • The medium that sends a signal from the source to the destination is known as the transmission channel.
  • The Joule-Thomson effect is based upon the sudden expansion of gases.
  • Rutherford’s atomic model could not explain the behavior of electrons.
  • Mach number is used in connection with the speed of aircraft.
  • The mass-energy relation is the outcome of the special theory of relativity.

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