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Current Electricity Class 12 MCQ NEET. We covered all the Current Electricity Class 12 MCQ NEET in this post for free so that you can practice well for the exam.
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MCQ on Current Electricity for NEET Students
Quick Quiz
A copper plate can be heated by
(A) placing it in a time-varying magnetic field.
(B) placing in a space with varying magnetic fields, but does not vary with time.
(C) passing either a direct or alternating current through the plate.
(D) both (A) and (C) are correct.
Option d – both (A) and (C) are correct.
In a common emitter transistor amplifier, an increase of 40 μA in the base current causes an increase of 0.5 mA in the collector current. The change in emitter current is ( Current Electricity Class 12 MCQ )
(A) 1080 mA
(B) 1080 μA
(C) 540 mA
(D) 540 μA
Option d – 540 μA
A child is looking at the view down on the ground of an airplane at an altitude of 12 km. Assuming that his pupil’s diameter is 5 mm and the wavelength of visible light is 500 nm, the child will be able to resolve linear objects of the size is about
(A) 3.02 m
(B) 4.88 m
(C) 1.47 m
(D) 0.87 m
Option c – 1.47 m
Photons absorbed in the matter are converted to heat. A source emitting n photons per second of frequency v is used to convert 500 g of ice into the water at 0 °C. Then, the time T took from 0°C to the conversion ( Current Electricity Class 12 MCQ )
(A) decreases with increasing n, with v fixed.
(B) decreases with n fixed, v increasing.
(C) remains constant with n and v changing such that their product is constant.
(D) All of these.
Option d – All of these.
A double convex lens made of glass of refractive index 1.5 has both radii of curvature of magnitude 10 cm. If an object is placed at a distance of 20 cm from this lens, the position of the image formed is
(A) 20 cm and on the same side as the object.
(B) 20 cm and on the opposite sides of the object.
(C) 40 cm and on the same side of the object.
(D) 40 cm and on the opposite side of the object.
Option b – 20 cm and on the opposite sides of the object.
Two sources of light of wavelength 2000 Å and 3000 Å are used in Young’s double slit experiment simultaneously. Which orders of fringes of two wavelength patterns coincide? ( Current Electricity Class 12 MCQ )
(A) 3rd order of 1st source and 5th of the 2nd
(B) 4th order of 1st and 2nd order of 2nd
(C) 6th order of 1st and 4th order of 2nd
(D) 4th order of 1st and 6th order of 2nd
Option c – 6th order of 1st and 4th order of 2nd
A second harmonic has to be generated in a string of length 40 cm stretched between two rigid supports. The point where the string has to be plucked and touched are
(A) plucked at 10 cm and touched at 20 cm.
(B) plucked at 10 cm and touched at 15 cm.
(C) plucked at 20 cm and touched at 20 cm.
(D) plucked at 20 cm and touched at 30 cm.
Option a – plucked at 10 cm and touched at 20 cm.
Spherical wavefronts, emitted from a point source, strike a plane-reflecting surface. What will happen to these wavefronts, immediately after reflection? ( Current Electricity Class 12 MCQ )
(A) Wavefronts will remain spherical with the same curvature, both in magnitude and sign.
(B) Wavefronts will become plane wavefronts.
(C) Wavefronts will remain spherical, with the same curvature, but a sign of curvature reversed.
(D) Wavefronts will remain spherical, but with different curvature, both in magnitude and sign.
Option c – Wavefronts will remain spherical, with the same curvature, but a sign of curvature reversed.
A small telescope has an objective lens of focal length 120 cm and an eyepiece of focal length 5.0 cm. The magnifying power of the telescope for viewing distant objects when the final image is formed at a distance of 30 cm is
(A) 33.6
(B) 28
(C) 22.6
(D) 11.4
Option b – 28
From Brewster’s law, except for polished metallic surfaces, the polarising angle ( Current Electricity Class 12 MCQ )
(A) depends on the wavelength and is different for different colors.
(B) independent of wavelength and is different for different colors.
(C) independent of wavelength and is the same for different colors.
(D) depends on the wavelength and is the same for different colors.
Option a – depends on the wavelength and is different for different colors
A source of unknown frequency gives 4 beats/s when sounded with a source of known frequency 250 Hz. The second harmonic of the source of unknown frequency gives five beats per second when sounded with a source of frequency 513 Hz. The unknown frequency is
(A) 254 Hz
(B) 246 Hz
(C) 240 Hz
(D) 260 Hz
Option a – 254 Hz
Choose the incorrect statement ( Current Electricity Class 12 MCQ )
(A) When a body does some work against friction, its kinetic energy decreases.
(B) Work done by a body is independent of time.
(C) The power of a body varies inversely with time.
(D) When work done over a closed path is positive, force must be conservative.
Out of the following which one is not possible energy for a photon to be emitted by a hydrogen atom according to Bohr’s atomic model?
(A) 0.65 eV
(B) 1.9 eV
(C) 4.9 eV
(D) 2.55 eV
Option c – 4.9 eV
The rear side of the truck is open and a box of mass 20 kg is placed 5 m away from the open end. The coefficient of friction between the box and the surface below it is 0.2. The truck starts from rest with an acceleration of 3.5 m s2 on a straight road. At what distance from the starting point does the box fall off the truck? Take g = 10 m/s² ( Current Electricity Class 12 MCQ )
(A) 20 m
(B) 13.5 m
(C) 11.67 m
(D) 10 m
Option c – 11.67 m
A cricketer can throw a ball to a maximum horizontal distance of 120 m. How high above the ground can the cricketer throw the same ball?
(A) 100 m
(B) 50 m
(C) 25 m
(D) 60 m
Option d – 60 m
Two spheres of the same material have radii 1 m and 9 m and temperatures of 5727 °C and 1727 °C respectively. The energy radiated per second by the first sphere is ( Current Electricity Class 12 MCQ )
(A) greater than that by the second.
(B) less than that by the second.
(C) same as that of the second.
(D) nullified by the second sphere.
Option c – same as that of the second.
If the current sensitivity of a galvanometer is doubled by doubling the number of turns, then its voltage sensitivity will be
(A) unchanged.
(B) doubled
(C) halved
(D) four times the original.
Option a – unchanged.
A wheel with a moment of inertia of 0.65 kg m² and a radius of 0.4 m is rolling on the road without sliding with an angular velocity of 10 rad/s. If the translational kinetic energy of the wheel is 55% total kinetic energy, the mass of the wheel is ( Current Electricity Class 12 MCQ )
(A) 1.75 kg
(B) 2.39 kg
(C) 4 kg
(D) 5 kg
Option d – 5 kg
The waves that are bent down by the ionosphere are ……… ( Current Electricity Class 12 MCQ NEET )
(A) ground waves
(B) sky waves
(C) surface waves
(D) space waves
Option b – sky waves
Assertion: The Laplace correction is based on the fact that the exchange of heat between the region of compression and rarefaction in the air is not possible. Reason: Air is a bad conductor of heat and the velocity of sound in air is high ( Current Electricity Class 12 MCQ )
(A) The assertion is True, Reason is True; Reason is a correct explanation for Assertion.
(B) The assertion is True, and Reason is True; Reason is not a correct explanation for Assertion.
(C) The assertion is True, Reason is False.
(D) The assertion is False, Reason is True.
Option a – The assertion is True, Reason is True; Reason is a correct explanation for Assertion.
A coil in the heater consumes power P on passing current… If it is cut into halves and joined in parallel, it will consume power
(a) P
(b) (\frac {P}{2})
(c) 2P
(d) 4P
Option d – 4P
A fuse wire repeatedly gets burnt when used with a good heater. It is advised to use a fuse wire of ( Current Electricity Class 12 MCQ )
(a) more length
(b) less radius
(c) less length
(d) more radius
Option d – more radius
The resistivity does not change if
(a) the material is changed
(b) the temperature is changed
(c) the shape of the resistor is changed
(d) both material and temperature are changed
Option c – the shape of the resistor is changed
The property of electric current which is applicable in the fuse wire is ( Current Electricity Class 12 MCQ )
(a) the chemical effect of the current
(b) the magnetic effect of the current
(c) the heating effect of the current
(d) the optical property of the current
Option c – the heating effect of the current
Suppose a rod is given a negative charge by rubbing it with wool. Which one of the following statements is correct in this case?
(a) The positive charges are transferred from rod to wool
(b) The positive charges are transferred from wool to rod
(c) The negative charges are transferred from rod to wool
(d) The negative charges are transferred from wool to rod
Option d – The negative charges are transferred from wool to rod
Which one of the following devices is non-ohmic? ( Current Electricity Class 12 MCQ )
(a) Conducting copper coil
(b) Electric heating coil
(c) Semiconductor diode
(d) Rheostat
Option c – Semiconductor diode
Which one of the following does not convert electrical energy into light energy?
(a) A candle
(b) A light-emitting diode
(c) A laser
(d) A television set
Option a – A candle
Which one of the following statements regarding magnetic field is NOT correct? ( Current Electricity Class 12 MCQ )
(a) The magnetic field is a quantity that has direction and magnitude
(b) Magnetic field lines are closed curves
(c) Magnetic field lines are open curves
(d) No two magnetic field lines are found to cross each other
Option c – Magnetic field lines are open curves
In an incandescent electric bulb, the filament of the bulb is made up of which metal?
(a) Aluminium
(b) Copper
(c) Tungsten
(d) Silver
Option c – Tungsten
The instrument used for detecting the presence of electric current in a circuit is
(a) a Refractometer
(b) a Galvanometer
(c) Viscometer
(d) a Diffractometer
Option b – a Galvanometer
Two devices are connected between two points say A and B in parallel. The physical quantity that will remain the same between the two points is
(a) current
(b) voltage
(c) resistance
(d) None of these
Option b – voltage
In a step-down transformer, the AC output gives the
(a) currently more than the input current
(b) current less than the input current
(c) current equal to the input current
(d) voltage more than the input voltage
Option a – currently more than the input current
Electricity is produced through the dry cells from
(a) chemical energy
(b) thermal energy
(c) mechanical energy
(d) nuclear energy
Option a – chemical energy
The magnetic field inside a long straight solenoid carrying current
(a) Is the same at all points
(b) Is zero
(c) Decreases as we move towards its end
(d) Increases as we move towards its end
Option a – Is the same at all points
What is the commercial unit of electrical energy?
(a) Joules
(b) Kilojoules
(c) Kilowatt-hour
(d) Watt-hour
Option c – Kilowatt-hour
Electric potential is a :
(a) scalar quantity
(b) vector quantity
(c) neither scalar nor vector
(d) sometimes scalar and sometimes vector
Option a – scalar quantity
Coulomb is the SI unit of
(a) charge
(b) current
(c) potential difference
(d) resistance
Option a – charge
When an electric current is passed, electrons move from
(a) high potential to low potential.
(b) low potential to high potential.
(c) in the direction of the current.
(d) against the direction of the current.
Option b – low potential to high potential
The heating element of an electric iron is made up of
(a) copper
(b) nichrome
(c) aluminum
(d) iron
Option b – nichrome
The electrical resistance of insulators is
(a) high
(b) low
(c) zero
(d) infinitely high.
Option d – infinitely high
The electrical resistivity of any given metallic wire depends upon
(a) its thickness
(b) its shape
(c) the nature of the material
(d) its length
Option c – the nature of the material
Electric power is inversely proportional to
(a) resistance
(b) voltage
(c) current
(d) temperature
Option a – resistance
The frequency of A.C. mains in India is
(a) 30 Hz
(b) 50 Hz
(c) 60 Hz
(d) 120 Hz
Option b – 50 Hz
Electric iron uses wires of alloy as
(a) they do not oxidise at high temperatures
(b) they do not burn at high temperatures
(c) both (a) and (b)
(d) neither (a) nor (b)
Option c – both (a) and (b)
The parameters of electricity supply in India are
(a) Potential Difference of 220 V, Frequency of 50 hertz and Current Rating of 5A/15A
(b) Potential Difference of 150 V, Frequency of 40 hertz and Current Rating of 10 A
(c) Potential Difference of 220 V, Frequency of 60 hertz and Current Rating of 15A
(d) Potential Difference of 220 V, Frequency of 40 hertz and Current Rating of 5 A
Option a – Potential Difference of 220 V, Frequency of 50 hertz and Current Rating of 5A/15A
The earth’s magnetic field always has a vertical component except at the
(a) magnetic equator
(b) magnetic poles
(c) geographic north pole
(d) latitude 45°
Option a – magnetic equator
Domestic electrical wiring is basically an
(a) series connection
(b) parallel connection
(c) combination of series and parallel connections
(d) series connection within each room and parallel connection elsewhere
Option b – parallel connection
What should be the characteristic of fuse wire?
(a) High melting point, high specific resistance
(b) Low melting point, low specific resistance
(c) High melting point, low specific resistance
(d) Low melting point, high specific resistance
Option d – Low melting point, high specific resistance
The heating element of an electric heater should be made with a material, which should have
(a) high specific resistance and high melting point
(b) high specific resistance and low melting point
(c) low specific resistance and low melting point
(d) low specific resistance and high melting point
Option a – high specific resistance and high melting point
Of the two bulbs in a house, one glows brighter than the other. Which of the two has a large resistance?
(a) The bright bulb
(b) The dim bulb
(c) Both have the same resistance
(d) The brightness does not depend upon the resistance
Option b – The dim bulb
The magnet is strongest near the
(a) poles of the magnet
(b) only the south pole of the magnet
(c) centre of the magnet
(d) on the equator point from the poles of the magnet
Option a – poles of the magnet
When an electrical safety fuse is rated (marked) as 16 A, it means it
(a) will not work if the current is less than 16 A
(b) has a resistance of 16 W
(c) will work if the temperature is more than 16°C
(d) will be blown (break) if the current exceeds 16 A
Option d – will be blown (break) if the current exceeds 16 A
At the time of a short circuit, the current in the circuit
(a) vary continuously
(b) increases heavily
(c) decreases substantially
(d) does not change
Option b – increases heavily
Lenz’s law is a consequence of the law of conservation of
(a) Charge
(b) Momentum
(c) Energy
(d) Mass
Option c – Energy
A magnetic field can be produced by
(a) A moving charge only
(b) A changing electric field only
(c) Both of these
(d) None of the above
Option c – Both of these
How many units of electricity will be consumed if you use a 60-watt electric bulb for 5 hours every day for 30 days?
(a) 12
(b) 9
(c) 6
(d) 3
Option b – 9
Consider the following statements and select the correct code. Assertion (A): The temperature of a metal wire rises when an electric current is passed through it. Reason (R): Collision of metal atoms with each other releases heat energy. Codes :
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Option a – Both A and R are true and R is the correct explanation of A
Consider the following statements and select the correct code. Assertion (A): In our houses, the current in the A.C. electricity line changes direction 60 times per second. Reason (R): The frequency of the alternating voltage supplied is 50 Hz. Codes :
(a) Both A and R are correct and R is the correct explanation of A.
(b) Both A and R are correct, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Option d – A is false, but R is true
In electromagnetic induction, the induced charge does not depend on
(a) Change in flux
(b) Time of change of magnetic flux
(c) Resistance of Coil
(d) None of the above
Option b – Time of change of magnetic flux
At temperature 0K, the germanium behaves as a / an
(a) conductor
(b) insulator
(c) super-conductor
(d) ferromagnetic
Option b – insulator
Appropriate material to be used in the construction of resistance boxes out of the following is
(a) copper
(b) iron
(c) manganin
(d) aluminium
Option c – manganin
If the temperature is decreased, then the relaxation time of electrons in metals will
(a) increase
(b) decrease
(c) fluctuate
(d) remains constant
Option a – increase
The transformer is used
(a) for converting AC into DC
(b) for converting DC into AC
(c) to step up DC voltages
(d) to step up or step down AC voltages
Option d – to step up or step down AC voltages
Which of the following is the best conductor of electricity?
(a) Aluminium
(b) Copper
(c) Silver
(d) Gold
Option c – Silver
Constantan wire is used for making standard resistance because it has
(a) a high melting point
(b) low specific resistance
(c) high specific resistance
(d) negligible temperature coefficient of resistance
Option d – negligible temperature coefficient of resistance
A piece of copper and another of germanium are cooled from room temperature to 80° K. The resistance of
(a) each of them increases
(b) each of them decreases
(c) copper increases and germanium decreases
(d) copper decreases and germanium increases
Option d – copper decreases and germanium increases
Which of the following quantities do not change when a resistor connected to a battery is heated due to the current?
(a) Drift speed
(b) Resistivity
(c) Resistance
(d) Number of free electrons
Option d – Number of free electrons
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