CBSE 12th Physics (Term 1) Paper 2021-22 | Class 12 Year Wise Previous Years Questions

Physics

1. A negatively charged object X is repelled by another charged object Y. However an object Z is attracted to object Y. Whi 2. In an experiment three microscopic latex spheres are sprayed into a chamber and became charged with charges +3e, +5e and 3. An object has charge of 1 C and gains 5.0 $$\times$$ 1018 electrons. The net charge on the object becomes - 4. Kirchhoff's first rule $$\Sigma$$I = 0 and second rule $$\Sigma$$IR = $$\Sigma$$E (where the symbols have their usual me 5. The electric power consumed by a 220 V $$-$$ 100 W bulb when operated at 110 V is 6. Which of the following has negative temperature coefficient of resistivity? 7. Two wires carrying currents I1 and I2 lie, one slightly above the other, in a horizontal plane as shown in figure. The r 8. 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 9. If an ammeter is to be used in place of a voltmeter, then we must connect with the ammeter a - 10. The magnetic field at the centre of a current carrying circular loop of radius R is B1. The magnetic field at a point on 11. 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 12. The rms current in a circuit connected to a 50 Hz ac source is 15 A. The value of the current in the circuit $$\left( {{ 13. In a circuit the phase difference between the alternating current and the source voltage is $${\pi \over 2}$$. Which of 14. The electric potential V at any point (x, y, z) is given by V = 3x2 where x is in metres and V in volts. The electric fi 15. Which of the diagrams correctly represents the electric field between two charged plates if a neutral conductor is place 16. A variable capacitor is connected to a 200 V battery. If its capacitance is changed from 2 $$\mu$$F to X $$\mu$$F, the d 17. A potential difference of 200 V is maintained across a conductor of resistance 100 $$\Omega$$. The number of electrons p 18. The impedance of a series LCR circuit is - 19. When an alternating voltage E = Eo sin $$\omega$$t is applied to a circuit, a current $$I = {I_o}\sin \left( {\omega t + 20. A current carrying wire kept in a uniform magnetic field, will experience a maximum force when it is 21. 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 22. In a dc circuit the direction of current inside the battery and outside the battery respectively are - 23. The magnitude of electric field due to a point charge 2q, at distance r is E. Then the magnitude of electric field due t 24. 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 25. 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 26. A square sheet of side 'a' is lying parallel to XY plate at z = a. The electric field in the region is $$\overrightarrow 27. Three charges q, $$-$$q and q0 are placed as shown in figure. The magnitude of the net force on the charge q0 at point O 28. A + 3.0 nC charge Q is initially at rest at a distance of r1 = 10 cm from a + 5.0 nC charge q fixed at the origin. The c 29. A car battery is charged by a 12 V supply, and energy stored in it is 7.20 $$\times$$ 105 J. The charge passed through t 30. A straight conducting rod of length l and mass m is suspended in a horizontal plane by a pair of flexible strings in a m 31. A constant current is flowing through a solenoid. An iron rod is inserted in the solenoid along its axis. Which of the f 32. A circuit is connected to an ac source of variable frequency. As the frequency of the source is increased, the current f 33. If n, e, $$\tau$$ and m have their usual meanings, then the resistance of a wire of length l and cross-sectional area A 34. A proton and an alpha particle move in circular orbits in a uniform magnetic field. Their speeds are in the ratio of 9 : 35. A coil of area 100 cm2 is kept at an angle of 30$$^\circ$$ with a magnetic field of 10$$-$$1 T. The magnetic field is re 36. A 15 $$\Omega$$ resistor, an 80 mH inductor and a capacitor of capacitance C are connected in series with a 50 Hz ac sou 37. Four objects W, X, Y and Z, each with charge +q are held fixed at four points of a square of side d as shown in the figu 38. Two sources of equal emf are connected in series. This combination is, in turn connected to an external resistance R. Th 39. Which of the following statements is correct? 40. The equivalent resistance between A and B of the network shown in figure is 41. A bar magnet has magnetic dipole moment $$\overrightarrow M $$. Its initial position is parallel to the direction of uni 42. Two charges 14 $$\mu$$C and $$-$$4 $$\mu$$C are placed at ($$-$$12 cm, 0, 0) and (12 cm, 0, 0) in an external electric f 43. A 300 $$\Omega$$ resistor and a capacitor of $$\left( {{{25} \over \pi }} \right)$$ $$\mu$$F are connected in series to 44. The core of a transformer is laminated to reduce the effect of 45. Assertion (A) : A negative charge in an electric field moves along the direction of the electric field.Reason (R) : On a 46. Assertion (A) : The poles of a bar magnet cannot be separated.Reason (R) : Magnetic monopoles do not exist. 47. Assertion (A) : When radius of a current carrying loop is doubled, its magnetic moment becomes four times.Reason (R) : T 48. Assertion (A) : Higher the range, lower is the resistance of an ammeter.Reason (R) : To increase the range of an ammeter 49. Assertion (A) : A step-up transformer cannot be used as a step-down transformer.Reason (R) : A transformer works only in 50. Equipotentials at a large distance from a collection of charges whose total sum is not zero are - 51. Four charges $$-$$q, $$-$$q, +q and +q are placed at the corners of a square of side 2 L is shown in figure. The electri 52. The points with the same potential are - 53. The current through branch bg is - 54. The power dissipated in R1 is - 55. The potential difference across R3 is -

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CBSE 12th Physics (Term 1) Paper 2021-22

MCQ (Single Correct Answer)

+0.77

-0

The magnetic field at the centre of a current carrying circular loop of radius R is B₁. The magnetic field at a point on its axis at a distance R from the centre of the loop is B₂. Then the ratio (B₁ / B₂) is

$$2\sqrt 2 $$

$${1 \over {\sqrt 2 }}$$

$$\sqrt 2 $$

$$2$$

CBSE 12th Physics (Term 1) Paper 2021-22

MCQ (Single Correct Answer)

+0.77

-0

The self-inductance of a solenoid of 600 turns is 108 mH. The self-inductance of a coil having 500 turns with the same length, the same radius and the same medium will be

95 mH

90 mH

85 mH

75 mH

CBSE 12th Physics (Term 1) Paper 2021-22

MCQ (Single Correct Answer)

+0.77

-0

The rms current in a circuit connected to a 50 Hz ac source is 15 A. The value of the current in the circuit $$\left( {{1 \over {600}}} \right)$$s after the instant the current is zero, is -

$${{15} \over {\sqrt 2 }}A$$

$$15\sqrt 2 A$$

$${{\sqrt 2 } \over {15}}A$$

$$8A$$

CBSE 12th Physics (Term 1) Paper 2021-22

MCQ (Single Correct Answer)

+0.77

-0

In a circuit the phase difference between the alternating current and the source voltage is $${\pi \over 2}$$. Which of the following cannot be the elements of the circuit?

only C

only L

L and R

L or C

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