CBSE 12th Physics (Term 1) Paper 2021-22
Paper was held on Fri, Dec 10, 2021 11:30 AM
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Physics

A negatively charged object X is repelled by another charged object Y. However an object Z is attracted to object Y. Whi
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In an experiment three microscopic latex spheres are sprayed into a chamber and became charged with charges +3e, +5e and
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An object has charge of 1 C and gains 5.0 $$\times$$ 1018 electrons. The net charge on the object becomes -
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Kirchhoff's first rule $$\Sigma$$I = 0 and second rule $$\Sigma$$IR = $$\Sigma$$E (where the symbols have their usual me
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The electric power consumed by a 220 V $$-$$ 100 W bulb when operated at 110 V is
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Which of the following has negative temperature coefficient of resistivity?
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Two wires carrying currents I1 and I2 lie, one slightly above the other, in a horizontal plane as shown in figure. The r
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Two parallel conductors carrying current of 4.0 A and 10.0 A are placed 2.5 cm apart in vacuum. The force per unit lengt
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If an ammeter is to be used in place of a voltmeter, then we must connect with the ammeter a -
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The magnetic field at the centre of a current carrying circular loop of radius R is B1. The magnetic field at a point on
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The self-inductance of a solenoid of 600 turns is 108 mH. The self-inductance of a coil having 500 turns with the same l
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The rms current in a circuit connected to a 50 Hz ac source is 15 A. The value of the current in the circuit $$\left( {{
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In a circuit the phase difference between the alternating current and the source voltage is $${\pi \over 2}$$. Which of
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The electric potential V at any point (x, y, z) is given by V = 3x2 where x is in metres and V in volts. The electric fi
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Which of the diagrams correctly represents the electric field between two charged plates if a neutral conductor is place
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A variable capacitor is connected to a 200 V battery. If its capacitance is changed from 2 $$\mu$$F to X $$\mu$$F, the d
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A potential difference of 200 V is maintained across a conductor of resistance 100 $$\Omega$$. The number of electrons p
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The impedance of a series LCR circuit is -
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When an alternating voltage E = Eo sin $$\omega$$t is applied to a circuit, a current $$I = {I_o}\sin \left( {\omega t +
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A current carrying wire kept in a uniform magnetic field, will experience a maximum force when it is
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The voltage across a resistor, an inductor, and a capacitor connected in series to an ac source are 20 V, 15 V and 30 V
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In a dc circuit the direction of current inside the battery and outside the battery respectively are -
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The magnitude of electric field due to a point charge 2q, at distance r is E. Then the magnitude of electric field due t
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The horizontal component of earth's magnetic field at a place is 0.2 G whereas it's total magnetic field is 0.4 G. The a
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The current in the primary coil of a pair of coils changes from 7 A to 3 A in 0.04 s. The mutual inductance between the
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A square sheet of side 'a' is lying parallel to XY plate at z = a. The electric field in the region is $$\overrightarrow
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Three charges q, $$-$$q and q0 are placed as shown in figure. The magnitude of the net force on the charge q0 at point O
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A + 3.0 nC charge Q is initially at rest at a distance of r1 = 10 cm from a + 5.0 nC charge q fixed at the origin. The c
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A car battery is charged by a 12 V supply, and energy stored in it is 7.20 $$\times$$ 105 J. The charge passed through t
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A straight conducting rod of length l and mass m is suspended in a horizontal plane by a pair of flexible strings in a m
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A constant current is flowing through a solenoid. An iron rod is inserted in the solenoid along its axis. Which of the f
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A circuit is connected to an ac source of variable frequency. As the frequency of the source is increased, the current f
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If n, e, $$\tau$$ and m have their usual meanings, then the resistance of a wire of length l and cross-sectional area A
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A proton and an alpha particle move in circular orbits in a uniform magnetic field. Their speeds are in the ratio of 9 :
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A coil of area 100 cm2 is kept at an angle of 30$$^\circ$$ with a magnetic field of 10$$-$$1 T. The magnetic field is re
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A 15 $$\Omega$$ resistor, an 80 mH inductor and a capacitor of capacitance C are connected in series with a 50 Hz ac sou
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Four objects W, X, Y and Z, each with charge +q are held fixed at four points of a square of side d as shown in the figu
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Two sources of equal emf are connected in series. This combination is, in turn connected to an external resistance R. Th
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Which of the following statements is correct?
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The equivalent resistance between A and B of the network shown in figure is
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A bar magnet has magnetic dipole moment $$\overrightarrow M $$. Its initial position is parallel to the direction of uni
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Two charges 14 $$\mu$$C and $$-$$4 $$\mu$$C are placed at ($$-$$12 cm, 0, 0) and (12 cm, 0, 0) in an external electric f
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A 300 $$\Omega$$ resistor and a capacitor of $$\left( {{{25} \over \pi }} \right)$$ $$\mu$$F are connected in series to
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The core of a transformer is laminated to reduce the effect of
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Assertion (A) : A negative charge in an electric field moves along the direction of the electric field.Reason (R) : On a
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Assertion (A) : The poles of a bar magnet cannot be separated.Reason (R) : Magnetic monopoles do not exist.
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Assertion (A) : When radius of a current carrying loop is doubled, its magnetic moment becomes four times.Reason (R) : T
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Assertion (A) : Higher the range, lower is the resistance of an ammeter.Reason (R) : To increase the range of an ammeter
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Assertion (A) : A step-up transformer cannot be used as a step-down transformer.Reason (R) : A transformer works only in
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Equipotentials at a large distance from a collection of charges whose total sum is not zero are -
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Four charges $$-$$q, $$-$$q, +q and +q are placed at the corners of a square of side 2 L is shown in figure. The electri
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The points with the same potential are -
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The current through branch bg is -
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The power dissipated in R1 is -
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The potential difference across R3 is -
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