Get Fastest and Authentic CBSE Class 12 Physics Answer Keys 2025
Hello Students,
Today on 21.02.2025, paper of Physics for class 12 was conducted by CBSE at various centers throughout India. Now, as usual, we are bringing to you the fastest CBSE Class 12 Physics Answer Key 2025 with PDF. These answer keys are of the paper codes 55/6/3, 55/6/2 and 55/6/3. Hopefully; these will help you estimate your marks in Physics. These answer keys focus on MCQs which appeared in the paper.
CBSE Class 12 Physics Answer Key 2025 Code - 55/6/3, Set - 3
Q.1 The ration of potential difference across AB in the circuit shown for the case (i) when switch S is closed and (ii) when S is open is:
Answer: Option (A) 1/4 or Option (B) – 1/2
Q.2 Two coherent waves, each of intensity I0 produce interference pattern on a screen. The average intensity of light on the screen is:
Answer: Option 2I0
Q.3 A particle of mass m and charge q moving with velocity of v î is subjected to a uniform electric field E ĵ. The particle will initially have a tendency move in a circle of radius:
Answer: Option (C) – (mv2/ qE) in x-y plane.
Q.4 A vertically held bar magnet is dropped along the axis of copper ring having a cut as shown in the diagram. The acceleration of the falling magnet is:
Answer: Option (B) – less than g
Q.5 Inside a nucleus, the nuclear forces between proton and proton, proton and neutron, neutron and neutron are Fpp, Fpn and Fnn respectively. Then find out greater than:
Answer: Option (D) – Fpp=Fpn=Fnn
Q.6 An ac source is connected to a resistor and an inductor in series. The voltage across the resistor and inductor are 8V and 6V respectively. The voltage of the source is:
Answer: Option (A) – 10V
Q.7 A proton and α – particle enter with the same velocity v in a uniform magnetic field B such that v ḻ B . The ratio of the radii of their paths is:
Answer: Option (B) – 1/2
Q.8 If Rs and Rp are the equivalent resistances of n resistors, each of value R, in series and parallel combinations respectively, then the value of (Rs – Rp) is:
Answer: Option (C) – (n2 -1/n)R
Q.9 A piece of a diamagnetic material, free to move when placed in a uniform magnetic field.
Answer: Option (B) – moves opposite to the field
Q.10 The wavelength of a photon is equal to the wavelength associated with an electron. Both will have the same value of:
Answer: Option (D) – linear momentum
Q.11 A galvanometer can be converted into an ammeter of desired range by connecting a :
Answer: Option (C) – small resistance is parallel
Q.12 The momentum (in kg m/s) of a photon of frequency 6.0 x 1014 Hz is :
Answer: Option (B) – 1.326 x 10-27
Q.13 Assertion (A): X-ray are produced when slow moving electrons are stopped by a metal target of high atomic number.
Reason (R): X-rays consist of low-energy photons.
Answer: Option (D) – Both Assertion and Reason are false.
Q.14 Assertion (A): The binding energy per nucleon is practically constant for mass number in the range (30<A<170).
Reason (R): Nuclear forces between the nucleons for mass numbers in the range (30<A<170) are not short –range
Answer: Option (C) – Assertion is true but Reason is false.
Q.15 Assertion (A): In a reflecting telescope, the image does not have chromatic aberration.
Reason (R): Chromatic aberration occurs only due to refraction of light through an optical medium.
Answer: Option (A) – Both Assertion and Reason are true and Reason is the correct explanation of the Assertion.
Q.16 Assertion (A): A hole is an apparent free particle with effective positive electronic charge.
Reason (R): A hole is not necessarily a vacancy left behind by an electron in the valence band.
Answer: Option (C) – Assertion is true but Reason is false.
Get CBSE Class 12 Physics Answer Key 2025, Code - 55/6/2, Set -2 below
Q.1 A wire of resistance R, connected to an ideal battery consumes a power P. If the wire is gradually stretched to double its initial length and connected across the same battery, the power consumed will be :
Answer: Option (A) – P/4
Q.2 A vertical held bar magnet is dropped …………………………falling magnet is:
Answer: Option (B) – Less than g
Q.3 A straight conduction is carrying a current of 2 A in +x direction along it. A uniform magnetic field B = (0.6 ĵ + 0.8 k̂) T is switched on, in the region. The force acting on 10 cm length of the conductor is :
Answer: Option (B) – (-16 ĵ + 0.12 k̂) N
Q.4 An ac source is connected to …………………………voltage of the source is:
Answer: Option (A) – 10V
Q.5 A proton and an α – particle………………………………radii of their paths is:
Answer: Option (B) – 1/2
Q.6 Two coherent waves………………………………………..light on the screen is:
Answer: Option (C) – 2I0
Q.7 If Rs and Rp are the equivalent…………………………..value of (Rs-Rp) is:
Answer: Option (C) (n2 -1/n)R
Q.8 A galvanometer can converted……………………………by connecting a:
Answer: Option (C) – small resistance in parallel
Q.9 Inside a nucleus…………………………………………….Then:
Answer: Option (D) – Fpp = Fpn = Fnn
Q.10 The de Broglie wavelength associated with an electron moving with energy 5 Ev is:
Answer: Option (D) – 0.55 nm
Q.11 A piece of a diamagnetic……………………………….a uniform magnetic field.
Answer: Option (B) – moves opposite to the field
Q.12 The momentum…………………………………………….6.0 x 1014 Hz is:
Answer: Option (B) – 1.326 x 10-27
Q.13 Assertion (A): A hole is an…………………………………………electronic charge.
Reason (R): A hole is not necessarily………………………………..valence band.
Answer: Option (C) – Assertion is true but Reason is false.
Q.14 Assertion (A): In a reflecting telescope………………………chromatic aberration.
Reason (R): Chromatic aberration………………………………..an optimal medium.
Answer: Option (A) – Both Assertion and Reason are true and Reason is the correct explanation of the Assertion.
Q.15 Assertion (A): The binding energy………………………………………(30<A<170).
Reason (R): Nuclear forces………………………………………are not short – range.
Answer: Option (C) – Assertion is true but Reason is false.
Q.16 Assertion (A): X-rays are produced…………………….of high atomic number.
Reason (R): X-rays consist of low-energy photons.
Answer: Option (D) – Both Assertion and Reason are false.
Get CBSE Class 12 Physics Answer Key 2025, Code - 55/6/1, Set -1 below
Q.1 The figure shows the voltage (V) versus the current (I) graphs for a wire at two temperatures T1 and T2. One can conclude that:
Answer: Option (D) – T1<T2
Q.2 If Rs and Rp are the equivalent…………………………..value of (Rs-Rp) is:
Answer: Option (C) (n2 -1/n)R
Q.3 The value of magnetic field at point O in the given figure is:
Answer: Option (C) – μ0I/4R
Q.4 A piece of a diamagnetic……………………………….a uniform magnetic field.
Answer: Option (B) – moves opposite to the field
Q.5 A galvanometer can converted……………………………by connecting a:
Answer: Option (C) – small resistance in parallel
Q.6 A proton and an α – particle………………………………radii of their paths is:
Answer: Option (B) – 1/2
Q.7 A vertical held bar magnet is dropped …………………………falling magnet is:
Answer: Option (B) – Less than g
Q.8 An ac source is connected to …………………………voltage of the source is:
Answer: Option (A) – 10V
Q.9 Two coherent waves………………………………………..light on the screen is:
Answer: Option (C) – 2I0
Q.10 The work function of a material is 2.21 eV. Which of the following cannot produce photoelectrons from it?
Answer: Option (A) – Red light
Q.11 The momentum…………………………………………….6.0 x 1014 Hz is:
Answer: Option (B) – 1.326 x 10-27
Q.12 Inside a nucleus…………………………………………….Then:
Answer: Option (D) – Fpp = Fpn = Fnn
Q.13 Assertion (A): In a reflecting telescope………………………chromatic aberration.
Reason (R): Chromatic aberration………………………………..an optimal medium.
Answer: Option (A) – Both Assertion and Reason are true and Reason is the correct explanation of the Assertion.
Q.14 Assertion (A): A hole is an…………………………………………electronic charge.
Reason (R): A hole is not necessarily………………………………..valence band.
Answer: Option (C) – Assertion is true but Reason is false.
Q.15 Assertion (A): X-rays are produced…………………….of high atomic number.
Reason (R): X-rays consist of low-energy photons.
Answer: Option (D) – Both Assertion and Reason are false.
Q.16 Assertion (A): The binding energy………………………………………(30<A<170).
Reason (R): Nuclear forces………………………………………are not short – range.
Answer: Option (C) – Assertion is true but Reason is false.