CBSE Class 12 Physics Answer Key 2023. All Sets PDF Solutions

Class 12 Physics Answer Key 2023

CBSE Class 12 Physics Answer Key 2023: Students in Class 12 of the Central Board of Secondary Education (CBSE) will take the Physics exam on 6th March 2023. The CBSE Class 12 Physics exam will begin at 10:30 a.m. and end at 01:30 pm.

After completion of the examination, we will upload the unofficial Class 10 Science Answer Key on this page. Class 12 Physics Answer Key 2023 is error-free and prepared by the expert faculties of Adda247. Instead of visiting different websites stay tuned with us and match your responses with the Class 12 Physics Answer Key 2023 provided on this page. Bookmark this page to get the Class 12 Physics Answer Key for all the subjects.

Check: CBSE Class 12 All Subject Answer Keys 2023

Class 12 Physics Answer Key – Student’s Reaction

We talk to the examinee who appeared in the class 12 physics exam, the overall exam paper was moderate to difficult. The exam prompted a range of reactions, although most students thought it to be well-balanced. The physics exam is always difficult due to the subject’s conceptual character. Apart from a few questions that are asked every year, the questions were largely straightforward. Some numerical questions needed mathematical expertise and the application of calculus, but the others were moderate in terms of complexity.

The most scoring section of the exam was section A, which consisted of MCQs. The paper progressively grew more difficult from there. The long-answer derivations were straight from the NCERT, however, the short-answer questions had several students perplexed. Stay tuned for CBSE Class 12 Physics Answer Key 2023.

CBSE Class 12 Physics Exam Analysis 2023

The CBSE Class 12 Physics exam will be held between 10:30 and 01:30. The students can check CBSE Class 12 Physics Exam Analysis 2023 after the completion of the examination. In CBSE Class12 Physics Exam Analysis 2023, we will assess the question paper based on the errors in questions, out-of-syllabus questions, and difficulty level of the question paper.

There were no questions that were not on the syllabus, and the topic was entirely based on the NCERT textbook. The multiple-choice questions were straightforward and included a few simple numerical as well. There were roughly 18–20 numerical questions on the test, and just a few direct derivations were required. In general, more questions—including case-based questions—were based on applications.

CBSE Class 12 Physics Answer Key 2023

Class 12 Physics paper Answer Key 2023

SECTION – A

1. Two horizontal thin long parallel wires, separated by a distance r carry current I each in the opposite directions. The net magnetic field at a point midway between them will be

(A) Zero

(B) (µ_oI/2πr) vertically down

(C) (2µ_oI/r) vertically upward

(D) (µ_oI/πr) vertically down

Answer: (D) (µ_oI/πr) vertically down

2. An electric dipole of length 2 cm is placed at an angle of 30^owith an electric field 2 x 10⁵N/C. If the dipole experiences a torque of 8 x 10 ^-3 Nm, the magnitude of either charge of the dipole is

(A) 4 µC

(B) 7 µC

(C) 8 mC

(D) 2 mC

Answer: (A) 4 µC

3. Which of the following cannot modify an external magnetic field as shown in the figure?

(A) Nickel

(B) Silicon

(C) Sodium

(D) Copper

Answer: (D) Copper

Class 12 Physics Question paper 2023 Set 1

Class 12 Physics Answer Key 2023 Set 1 ( 55/4/1)

Section A

Q1. Two charges q1 and q2 are placed at the centres of two spherical conducting shells of radius r1 and r2 respectively. The shells are arranged such that their centres are d [ >(r1 + r2)] distance apart. The force on q2 due to q1 is:

Q2. An electron enters a uniform magnetic field with speed v. It describes a semicircular path and comes out of the field. The final speed of the electron is

a) zero
b) v
c) v/2
d) 2v

Q3. The magnetic field lines near a substance are as shown in the figure. The substance is:

a) Copper
b) Iron
c) Sodium
d) Aluminium

Answer- a) Copper

Q4. The figure shows the variation of current (I) with time (t) in four devices P, Q, R, and S. The device in which an alternating current flows is

a) P
b) Q
c) R
d) S

Answer- d) S

Q5. The electromagnetic waves used in radar system are-

a) Infrared waves
b) Ultraviolet rays
c) Microwaves
d) X-rays

Answer- c)Microwaves

Class 12 Physics Answer Key 2023 Set 2

CBSE Class 12 Physics Exam Answer Key

Students find physics quite difficult because it has numerical, you can only get the right answers in numerical if your concepts are clear. Students appearing in the Class 12th physics examination on 6th March 2023 must check the answers from the answer key given on this page after completion of the examination. Our experts are all set to prepare Physics Class 12 Answer Key to ease students, so students do not need to rush to other websites, bookmark this page and visit this page regularly because we are the providing answer key for all the subjects before anyone else. Check the brief information given below in the table: 

Physics Class 12 Answer Key with Paper Solution 2023

Here we will give the question papers of Class 12th Physics with an answer key, match your responses with the Physics Class 12 Answer Key and sum up all the correct answers to get overall marks. As there is no negative marking so ignore the wrong answers. 

CBSE Class 12 Physics Answer key Questions and Answers- Last year

Q. A straight conducting rod of length I and mass m is suspended in a horizontal plane by a pair of flexible strings in a magnetic field of magnitude B. To remove the tension in the supporting strings, the magnitude of the current in the wire is

(a) mgB/l

(b) mgl/B

(c) mg/lB

(d) lB/mg

Answer- (c)

Q. A constant current is flowing through a solenoid. An iron rod is inserted in the solenoid along its axis. Which of the following quantities will not increase? 

(a) The magnetic field at the centre

(b) The magnetic flux linked with the solenoid

(c) The rate of heating

(d) The self-inductance of the solenoid

Answer- (c)

Q. A circuit is connected to an ac source of variable frequency. As the frequency of the source is increased, the current first increases and then decreases. Which of the following combinations of elements is likely to comprise the circuit ? 

(a) L, C and R

(b) L and C

(c) Land R

(d) R and C

Answer- (a)

Q.  If n, e, t and m have their usual meanings, then the resistance of a wire of length l and cross-sectional area A is given by –

Answer- (b)

Q. A proton and an alpha particle move in circular orbits in a uniform magnetic field. Their speeds are in the ratio of 9:4. The ratio of radii of their circular orbits (rp/ralpha) is

(a) 3/4

(b) 4/3

(c) 8/9

(d) 9/8

Answer- (d)

Q. A coil of area 100 cm2 is kept at an angle of 30° with a magnetic field of 10-1 T. The magnetic field is reduced to zero in 10-4 s. The induced emf in the coil is – 

(a) 5/3 v

(b) 5073 V

(c) 5.0 V

(d) 50.0 V

Answer- (a)

Q. A 15 2 resistor, an 80 mH inductor and a capacitor of capacitance Care connected in series with a 50 Hz ac source. If the source voltage and current in the circuit are in phase, then the value of capacitance is 

(a) 100 uF

(b) 127 uF

(c) 142 uF

(d) 160 uF

Answer- (b)

Q. 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 figure. Objects X and Z are on the midpoints of the sides of the square. The electrostatic force exerted by object W on object X is F. Then the magnitude of the force exerted by object W on Z is

(a) F/7

(b) F/5

(c) F/3

(d) F/2

Answer- (b)

Q. Two sources of equal emf are connected in series. This combination is, in turn connected to an external resistance R. The internal resistance of two sources are r, and r, (r, >r,). If the potential difference across the source of internal resistance r, is zero, then R equals to  

Answer- (b) (r2-r1)

Q. Which of the following statements is correct?

(a) Magnetic field lines do not form closed loops.

(b) Magnetic field lines start from north pole and end at south pole of a magnet.

(c)The tangent at a point on a magnetic field line represents the direction of the magnetic field at that point.

(d) Two magnetic field lines may intersect each other.

Answer- (c)

Q. The equivalent resistance between A and B of the network shown in figure is

(a) 3R Ω

(b) (3/2)R Ω

(c) 2R Ω

(d) (2/3) RΩ

Answer- (c)

Q. A bar magnet has magnetic dipole moment M. Its initial position is parallel to the direction of uniform magnetic field B. In this position, the magnitudes of torque and force acting on it respectively are –

(a) 0 and MB

(b) MB and MB

(c) 0 and 0

(d) |M X B| and 0

Answer- (c)

Q. A 300 Ω resistor and a capacitor of (25/?)uF are connected in series to a 200V- 50Hz ac source. The current in the circuit is –

(a) 0.1 A

(b) 0.4 A

(c) 0.6 A

(d) 0.8 A

Answer- (b)

Q. A negatively charged object X is repelled by another charged object Y. However, an object Z is attracted to object Y. Which of the following is the most possibility for the object Z? 

(a) positively charged only

(b) negatively charged only

(c) neutral or positively charged

(d) neutral or negatively charged

Answer- (c)

Q. In an experiment, three microscopic latex spheres are sprayed into a chamber and became charged with charges +3e, +5e and -3e respectively. All the three spheres came in contact simultaneously for a moment and got separated. Which one of the following are possible values for the final charge on the spheres? 

(a) +5e, -4e, +5e

(b) +6e, +6e, -7e

(c) -4e, +3.5e, +5.5e

(d) +5e, -80, +7e

Answer- (b)

Q. An object has charge of 1 C and gains 5.0 x 1018 electrons. The net charge on the object becomes –

(a) – 0.80 C

(b) + 0.80 C

(c) +1.80 C

(d) +0.20 C

Answer- (d)

Q. Kirchhoff’s first rule EI = 0 and second rule EIR = 2E (where the symbols have their usual meanings) are respectively based on –

(a) conservation of momentum and conservation of charge

(b) conservation of energy, conservation of charge

(c) conservation of charge, conservation of momentum

(d) conservation of charge, conservation of energy

Answer- (d)

Q. The electric power consumed by a 220 V – 100 W bulb when operated at 110 V is

(a) 25 W

(b) 30 W

(c) 35 W

(d) 45 W

Answer- (a)

Q. Which of the following has a negative temperature coefficient of resistivity?

(a) metal

(b) metal and semiconductor

(c) semiconductor

(d) metal and alloy

Answer- (c)

Q. Two wires carrying currents I, and I. lie. one slightly above the other, in a horizontal plane as shown in figure. The region of vertically upward strongest magnetic field is

(a) I

(b) II

(c) III

(d) IV

Answer- (b)

Q. 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 length between them is – 

(a) 6.4 x 10-5 N/m

(b) 6.4 x 10-2 N/m

(c) 4.6 x 10-4 N/m

(d) 3.2 x 10-4 N/m

Answer- (d)

Q. If an ammeter is to be used in place of a voltmeter, then we must connect with the ammeter a – 

(a) low resistance in parallel

(b) low resistance in series

(c) high resistance in parallel

(d) high resistance in series

Answer- (a)

Q. 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 

(a) 2√2

(b) 1/√2

(c) √2

(d) 2

Answer- (c) 

Q. 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

(a) 95 mH

(b) 90 mH

(c) 85 mH

(d) 75 mH

Answer- (d)

Q. The rms current in a circuit connected to a 50 Hz ac source is 15 A. The value of the current in the circuit Circuit , after the instant the current is zero, is –

(a) 15/√2 A

(b) 15√2 A

(c) √215 A

(d) 8

Answer- (a)

Q. In a circuit the phase difference between the alternating current and the source voltage is Which of the following cannot be the element(s) of the circuit?

(a) only c

(b) only L

(c) L and R

(d) L and C

Answer- (a)

Q. The electric potential V at any point (x, y, z) is given by V = 3×2 where x is in metres and V in volts. The electric field at the point (1 m, 0, 2m) is –

(a) 6 V/m along -x-axis.

(b) 6 V/m along +x-axis

(c) 1.5 V/m along –x-axis

(d) 1.5 V/m along +x-axis

Answer- (a)

Q. Which of the diagrams correctly represents the electric field between two charged plates if a neutral conductor is placed in between the plates ?

Answer- (d)

Q.  A variable capacitor is connected to a 200 V battery. If its capacitance is changed from 2 uF to X uF, the decrease in energy of the capacitor is 2 x 10-2 J. The value of X is – 

(a) 1 uF

(b) 2uF

(c) 3 uF

(d)) 4uF

Answer- (d)

Q. A potential difference of 200 V is maintained across a conductor of resistance 100 2. The number of electrons passing through it in ls is 

(a) 1.25 x 1019

(b) 2.5 x 1018

(c) 1.25 x 1018

(d) 2.5 x 1016

Answer- (a)

Q. The impedance of a series LCR circuit is –

Answer- (d)

Q. When an alternating voltage E = Eo sin wt is applied to a circuit, a current I = Io sin (wt+?/2) flows through it. The average power dissipated in the circuit is

(a) Erms. Irms

(b) Eo Io

(c) Eo Io/√2

(d) Zero

Answer- (d)

Q. A current carrying wire kept in a uniform magnetic field, will experience a maximum force when it is

(a) perpendicular to the magnetic field

(b) parallel to the magnetic field

(c) at an angle of 45° to the magnetic field

(d) at an angle of 60° to the magnetic field

Answer- (a)

Q. 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 respectively. The resultant voltage in the circuit is 

(a) 5 V

(b) 20 V

(c) 25 V

(d) 65 V

Answer- (c)

Q. In a dc circuit the direction of current inside the battery and outside the battery respectively are – 

(a) positive to negative terminal and negative to positive terminal

(b) positive to negative terminal and positive to negative terminal

(c) negative to positive terminal and positive to negative terminal

(d) negative to positive terminal and negative to positive terminal

Answer- (c)

Q.  The magnitude of electric field due to a point charge 2q, at distance r is E. Then the magnitude of electric field due to a uniformly charged thin spherical shell of radius R with total charge q at a distance – (r >> R) will be

(a) E/4

(b) 0

(c) 2E

(d) 4E

Answer- (c)

Q. 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 angle of dip at the place is 

(a) 30°

(b) 45°

(c) 60°

(d) 90°

Answer- (c)

Q. 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 two coils is 0.5 H. The induced emf in the secondary coil is – 

(a) 50 V

(b) 75 V

(c) 100 V

(d) 220 V

Answer-(a)

Q. A square sheet of side ‘a’ is lying parallel to XY plane at z = a. The electric field in the region is E = cz2k. The electric flux through the sheet is

(a) a4c

(b) ⅓a3c

(c) ⅓a4c

(d) 0

Answer-(a)

Q. A + 3.0 nC charge Q is initially at rest at a distance of r; = 10 cm from a + 5.0 nC charge q fixed at the origin. The charge Q is moved away from q to a new position at r, = 15 cm. In this process work done by the field is

(a) 1.29 x 10-5 J

(b) 3.6 x 105 J

(c) -4.5 x 10-7J

(d) 4.5 x 10-7 J

Answer- (d)

Q. A car battery is charged by a 12 V supply, and energy stored in it is 7.20 x 105 J. The charge passed through the battery is –

(a) 6.0 x 104 C

(b) 5.8 x 103 J

(c) 8.64 x 106 J

(d) 1.6 x 106c

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