Follow us
Class 12 ISC Physics Answer Key 2025 Live UpdatesClass 12 ISC Physics Answer Key 2025: We have provided the unofficial answer key for Class 12 ISC Physics exam held on March 7, 2025 here. CISCE conducted Class 12 ISC Physics 2025 exam from 2 pm to 5 pm. This answer key includes correct answers for all question sets, allowing students to check their answers and get an idea of their scores. By using the Class 12 ISC Physics Answer Key 2025, students can see where they made mistakes, understand their performance better, and identify areas where they might need to improve. Even though this answer key is unofficial, it will be a helpful resource for students to evaluate how they did and get ready for future exams. As soon as the exam is finished, we will update the unofficial answer key here so students can access it right away and anticipate their scores.
Also Read | Class 12 ISC Result Expected Release Date 2025
Class 12 ISC Physics Answer Key 2025
Our team has compiled the answer key for the objective-type questions in the Class 12 Physics exam for 2025. The unofficial answer key solutions are designed to assist students in their preparation. Please remember that these answer keys are unofficial and crafted by subject matter experts. Use them as a guide to enhance your study efforts.
Section A Question 1
| Question | Class 12 ISC Physics Answer Key 2025 |
|---|---|
| Q1 (i) When a battery is connected between the terminals P and Q, as shown in Figure 1 below, it is found that no current flows through 5Ω resistor. Then, the value of resistor X is: | (c) 25 Ω |
| Q1 (ii) The relative permeability of substance ‘X’ is slightly less than one and that of substance ‘Y’ is slightly more than one. Then: | (d) X is diamagnetic and Y is pragmagnetic |
| Q1 (iii) If kinetic energy of moving electrons is made four times, then their de Broglie wavelength becomes: | (d) half |
| Q1 (iv) A student has made connections, as shown in Figure 2 below, so that the wires MN and ST repel each other. But it is observed that they are attracting each other. What change should the student make for the wires to repel each other? | (b) Reverse the terminals of battery E 1 or E 2 |
| Q1 (v) N-type semiconductor is that which has: | (b) majority of free electrons as charge carriers |
| Q1 (vi) Given below are two statements marked, Assertion and Reason. Read the two statements and choose the correct option. | (c) Assertion is True and Reason is False |
| Q1 (vii) Given below are two statements marked, Assertion and Reason. Read the two statements and choose the correct option. | (a) Both assertion and reason are true and reason is the correct explanation of assertion |
Class 12 ISC Physics Exam Analysis 2025 Link
Students can click on the link to see the results of the 2025 Physics exam for Class 12 ISC and review their performance.
Class 12 ISC Subject-Wise Answer Key 2025 |
| Name of Subject | Answer Key 2025 Links |
|---|---|
| English Language | Class 12 ISC English Language Answer Key 2025 |
| English Literature | Class 12 ISC English Literature Answer Key 2025 |
| Economics | Class 12 ISC Economics Answer Key 2025 |
| Chemistry | Class 12 ISC Chemistry Answer Key 2025 |
| Mathematics | Class 12 ISC Mathematics Answer Key 2025 |
| Business Studies | Class 12 ISC Business Studies Answer Key 2025 |
| Commerce | Class 12 ISC Commerce Answer Key 2025 |
| Accounts | Class 12 ISC Accounts Answer Key 2025 |
| Biology | Class 12 ISC Biology Answer Key 2025 |
| Computer Science | Class 12 ISC Computer Science Answer Key 2025 |
| Physical Education | Class 12 ISC Physical Education Answer Key 2025 |
Class 12 ISC Physics Answer Key 2025 Live Updates
11 00 PM IST - 07 Mar'25
Class 12 ISC Physics Answer Key 2025: Why to Refer Answer Key?
Candidates must refer to the unofficial answer key solutions of Class 12 ISC Physics 2025 to anticipate their likely scores in the examination.
10 00 PM IST - 07 Mar'25
Class 12 ISC Physics Answer Key 2025: Was the paper time consuming?
Was the overall paper time-consuming?
Yes, it was a bit time taking
09 40 PM IST - 07 Mar'25
Class 12 ISC Physics Answer Key 2025: Section C Difficulty Level
Difficulty level of Section C
Moderate to Tough
09 20 PM IST - 07 Mar'25
Class 12 ISC Physics Answer Key 2025: Section B Difficulty Level
Difficulty level of Section B
Moderate to Tough
09 00 PM IST - 07 Mar'25
Class 12 ISC Physics Answer Key 2025: Section A Difficulty Level
Difficulty level of Section A
Easy to Moderate
08 40 PM IST - 07 Mar'25
Class 12 ISC Physics Answer Key 2025: Most Lengthy Sections
The most lengthier and tricky sections were Section B and Section C.
08 20 PM IST - 07 Mar'25
Class 12 ISC Physics Answer Key 2025: Expected Good Attempts
The expected good scores for the paper are estimated to be above 55 as per the student's feedback.
08 00 PM IST - 07 Mar'25
Q1 (vii) (a) Both assertion and re
Q1 (vii) (a) Both assertion and reason are true and reason is the correct explanation of assertion 07 40 PM IST - 07 Mar'25
Q1 (vi) (c) Assertion is True and
Q1 (vi) (c) Assertion is True and Reason is False 07 20 PM IST - 07 Mar'25
Q1 (v) (b) majority of free electr
Q1 (v) (b) majority of free electrons as charge carriers 07 00 PM IST - 07 Mar'25
Class 12 ISC Physics Answer Key 2025: Section A Question 1 (iv)
Q1 (iv) (b) Reverse the terminals of battery E 1 or E 2 06 45 PM IST - 07 Mar'25
Class 12 ISC Physics Answer Key 2025: Section A Question 1 (iii)
Q1 (iii) (d) half 06 30 PM IST - 07 Mar'25
Class 12 ISC Physics Answer Key 2025: Section A Question 1 (ii)
Q1 (ii) (d) X is diamagnetic and Y is pragmagnetic 06 00 PM IST - 07 Mar'25
Class 12 ISC Physics Answer Key 2025: Section A Question 1 (i)
Q1 (i) (c) 25 Ω 05 50 PM IST - 07 Mar'25
Class 12 ISC Physics Answer Key 2025: Difficulty Level of Exam
Overall Class 12 ISC Physics 2025 exam was Moderate to Difficult.
05 30 PM IST - 07 Mar'25
Class 12 ISC Physics Answer Key 2025: Why Refer to Unofficial Answer Key Solutions?
Candidates through unofficial Class 12 ISC Physics 2025 answer key solutions can anticipate their probable scores.
05 15 PM IST - 07 Mar'25
Class 12 ISC Physics Answer Key 2025: Experts Answers Soon
Our Collegedekho experts will provide Class 12 ISC Physics Answer Key 2025 anytime soon.
05 00 PM IST - 07 Mar'25
Class 12 ISC Physics Answer Key 2025: Exam Over
The Class 12 ISC Physics 2025 exam is over at 5 pm. Students will be moving out of the exam hall in some time.
04 40 PM IST - 07 Mar'25
Class 12 ISC Physics Answer Key 2025: In which sections internal choices are provided?
Internal choices have been provided in two questions each in Section B, Section C, and Section D of Class 12 ISC Physics 2025 exam.
04 20 PM IST - 07 Mar'25
Class 12 ISC Physics Answer Key 2025: Number of Questions in Section D
Section D of Class 12 ISC Physics 2025 consists of three questions of five marks each
04 00 PM IST - 07 Mar'25
Class 12 ISC Physics Answer Key 2025: Number of Questions in Section C
Section C of Class 12 ISC Physics 2025 consists of nine questions of three marks each.
03 40 PM IST - 07 Mar'25
Class 12 ISC Physics Answer Key 2025: Number of Questions in Section B
Section B of Class 12 ISC Physics 2025 consists of seven questions of two marks each.
03 20 PM IST - 07 Mar'25
Class 12 ISC Physics Answer Key 2025: Number of Questions in Section A
Section A consists of one question having sub-parts of one mark each
03 00 PM IST - 07 Mar'25
Class 12 ISC Physics Answer Key 2025: Important Guideline
Candidates are allowed an additional 15 minutes for only reading the paper. They must NOT start writing during this time.
02 40 PM IST - 07 Mar'25
Class 12 ISC Physics Answer Key 2025: Total Sections
This Class 12 ISC Physics paper is divided into four sections – A, B, C, and D.
02 20 PM IST - 07 Mar'25
Class 12 ISC Physics Answer Key 2025: Total Marks
In Class 12 ISC Physics 2025 exam, Theory will be 70 marks, and practical will be 20 marks.
02 00 PM IST - 07 Mar'25
Class 12 ISC Physics Answer Key 2025: Exam begins
The examination for ISC Physics 2025 Class 12 has begun at 2 pm today.
01 45 PM IST - 07 Mar'25
Class 12 ISC Physics Answer Key 2025: Most Important Question 11
What happens when an electron collides with a positron?
01 30 PM IST - 07 Mar'25
Class 12 ISC Physics Answer Key 2025: Most Important Question 10
Why does a car driver use a convex mirror as a rear-view mirror?
01 15 PM IST - 07 Mar'25
Class 12 ISC Physics Answer Key 2025: Most Important Question 9
Draw a neat and labelled diagram of an experimental setup of Young’s double slit experiment to study the interference of light and show that:β=λD/d Where the terms have their usual meaning. Show intensity variation in the interference.
01 00 PM IST - 07 Mar'25
Class 12 ISC Physics Answer Key 2025: Most Important Question 8
For a common emitter transistor amplifier, the audio signal voltage across the collector resistance (rc ) of 2 kΩ is 2 V. If the current amplification factor (β) of the transistor is 100, calculate the input signal voltage (VBE) and base current (IB) for base resistance of 1 kΩ.
12 45 PM IST - 07 Mar'25
Class 12 ISC Physics Answer Key 2025: Most Important Question 7
Show how you will obtain an AND gate using only NOR gates. Draw the truth table for this arrangement of gates.
12 30 PM IST - 07 Mar'25
Class 12 ISC Physics Answer Key 2025: Most Important Question 6
Assertion: If critical angle of glass-air pair (μg = 3/2) is θ1 and that of water-air pair (μw = 4/3) is θ2, then the critical angle for the water-glass pair will lie between θ1 and θ2.
Reason: A medium is optically denser if its refractive index is greater.(a) Both Assertion and Reason are true and Reason is the correct explanation for Assertion.
(b) Both Assertion and Reason are true but Reason is not the correct explanation for Assertion.
(c) Assertion is false and Reason is true.
(d) Both Assertion and Reason are false.12 15 PM IST - 07 Mar'25
Class 12 ISC Physics Answer Key 2025: Most Important Question 5
Assertion: An astronomical telescope has an objective lens having large focal length.
Reason: Magnifying power of an astronomical telescope varies directly with focal length of the objective lens.(a) Both Assertion and Reason are true and Reason is the correct explanation for Assertion.
(b) Both Assertion and Reason are true but Reason is not the correct explanation for Assertion.
(c) Assertion is false and Reason is true.
(d) Both Assertion and Reason are false.12 00 PM IST - 07 Mar'25
Class 12 ISC Physics Answer Key 2025: Most Important Question 4
An ideal PN junction diode offers:
(a) zero resistance in forward as well as reverse bias.
(b) infinite resistance in forward as well as reverse bias.
(c) zero resistance in forward, but infinite resistance in reverse bias.
(d) infinite resistance in forward, but zero resistance in reverse bias.11 45 AM IST - 07 Mar'25
Class 12 ISC Physics Answer Key 2025: Most Important Question 3
The de Broglie wavelength of an electron in the first Bohr’s orbit of hydrogen atom is equal to
(a) diameter of the first orbit.
(b) circumference of the first orbit.
(c) radius of the second orbit.
(d) h/2π.11 30 AM IST - 07 Mar'25
Class 12 ISC Physics Answer Key 2025: Most Important Question 2
Magnetic susceptibility of a diamagnetic substance:
(a) decreases with the increase in its temperature.
(b) is not affected by the change in its temperature.
(c) increases with increase in its temperature.
(d) first increases then decreases with increase in its with temperature.11 15 AM IST - 07 Mar'25
Class 12 ISC Physics Answer Key 2025: Most Important Question 1
A circular coil having N turns of radius R carrying a current I is used to produce a magnetic field B at its centre O. If this coil is opened and rewound such that the radius of the newly formed coil is 2R, carrying the same current I, what will be the magnetic field at the centre O?
(a) 2B
(b) B
(c) B/2
(d) B/411 00 AM IST - 07 Mar'25
Class 12 ISC Physics Answer Key 2025: Exam Today
Council for the Indian School Certificate Examinations (CISCE) will be conducting Class 12 ISC Physics 2025 exam today, March 7, 2025.
Are you feeling lost and unsure about what career path to take after completing 12th standard?
Say goodbye to confusion and hello to a bright future!
Was this article helpful?
