CBSE Class 12 Physics Answer Key 2021-22 – The Central Board of Secondary Education (CBSE) has conducted the Term 1 exam for Class 12 Physics on December 10, 2021. The exam was held from 11:30 a.m. to 1 pm for a total duration of 1.5 hours of writing time. Students who appeared for today’s paper can check the question with answers here. Various coaching institutes and subject experts have released the CBSE Class 12 Physics answer key. You will also get the video solutions, exam analysis for the same. It can be used by the students to cross-check their answers and calculate their probable marks in the exam before the CBSE 12th Term 1 result is announced. CBSE shall also release the Class 12 answer key online at cbse.gov.in. Check more details on CBSE Class 12 Physics Answer Key 2021-22 from the page below.
Latest: CBSE Class 12 Physics question with answers for Term 1 is now available. Check the complete answer key below.
CBSE Class 12 Physics Answer Key 2021-22
The CBSE Class 12 Physics Answer Keys will help students calculate their grades for the CBSE Term 1 exam. Students can check CBSE 12th Physics Question Paper 2021 with Answers from the section below.
Q1. An electric dipole placed in a non-uniform electric field will experience:
Ans. both force and torque
Q2. Let N1 be the number of electric field lines going out of an imaginary cube of side a that encloses an isolated point charge 2q and N2 be the corresponding number for an imaginary sphere of radius a that encloses an isolated point charge 3q. Then (N1/N2) is:
Q3. In a circuit given below P ≠ R and the reading of the galvanometer is same with switch S open or closed. Then:
Ans. IR = IG
Q4. Two wires A and B, of the same material having length in the ratio 1:2 and diameter in the ratio 2:3 are connected in series with a battery. The ratio of the potential differences across the two wires respectively is:
Q5. Two moving coil galvanometers G1 and G2 have the following particulars respectively:
N1 = 30, A1 = 3.6 x 10-3m2,, B1 = 0.25T
N2 = 42, A2 = 1.8 x 10-3m2,, B2 = 0.50T
The spring constant is same for both the galvanometers. The ratio of current sensitivity of G1 and G2 is:
Q6. A current 1 is flowing through the loop as shown in the figure (MA=R, MB=2R). The magnetic field at the center of the loop is μ0I/R times.
Ans. 7/16 out of the plane of the paper
Q7. A capacitor and an inductor are connected in two different ae circuits with a bulb glowing in each circuit. The bulb glows more brightly when:
Ans. the number of turns in the inductor is increased.
Q8. A pure inductor of 318 mH and a pure resistor of 75 are connected in series to an ac source of 50 Hz. The voltage across 75 The resistor is found to be 150 V. The source voltage is:
Ans. 250 V
Q9. The electric potential at a point on the axis of a short electric dipole, at a distance x from the midpoint of dipole, is proportional to:
Q10. Let F1 the magnitude of the force between two small spares, charged to a constant potential in free space, and F2 be the magnitude of the force between them in a medium of dielectric constant K. Then (F1/F2) is:
Q11. Infinity resistance in a resistance box has:
Ans. A gap only.
Q12. A battery of 15 V and negligible internal resistance is connected across a 50 resistor. The amount of energy dissipated as heat in the resistor in one minute is:
Ans. 270 J
Q13. Lenz’s law in the consequence of the law of conservation of:
Q14. The vertical component of earth’s magnetic field at a place is (13) times the horizontal component. The angle of that place is:
Ans. 30 degrees
Q15. A long straight wire in the horizontal plane carries a current of 15 A in the north to south direction. The magnitude and the direction of magnetic field at a point 2-5 m east of the wire respectively are:β
Ans. 1-2T, vertically upward
Q16. The emf induced in a 10 H inductor in which current changes forms 11 A to 2 A in 9x(10)-1s is:
Q17. A charge q is placed at the center of the line joining two charges q and q. The system of the three charges will be in equilibrium id Q is:
Ans. – q4
Q18. Electric flux of an electric field E through an area dA is given by:
Q19. In a potentiometer experiment, the balancing length with a cell is 120cm. When the cell is shunted with a 1 Ω resistance, the balancing length becomes 40 cm. The internal resistance of the cell is:
Q20. An electron is projected with velocity v along the x-axis of a current carrying long solenoid. Which of the following statements is true?
Ans. The path of electron will be helical
Q21. If the speed v of a charged particle moving in a magnetic field B (v is perpendicular to B) is halved, then the radius of its path will:
Ans. become half
Q22. A metal plate is getting heated. Which one of the following statements is incorrect?
Ans. It is placed in a space varying magnetic field that does not vary with time.
Q23. In an ac circuit the applied voltage and resultant current are E = E0 sin ωt and I = I0 sin (ωt + ⊼/2) respectively. The average power consumed in the circuit is:
Q24. The speed acquired by a free electron when accelerated from rest through a potential difference of 100V is:
Ans. 6×106 ms-1
Q25. Which of the following is not affected by the presence of a magnetic field?
Ans. A rectangular current loop with its plane parallel to the field
Q26. Two point charged +16q and -4q are located at x = 0, and x = L. The location of the point on the x-axis at which the resultant electric field due to these charges is zero, is:
Q27. An electric dipole of dipole moment 4 x 10-5 C-m, kept in a uniform electric field of 10-3 NC-1 experiences a torque of 2 x 10-8 Nm. The angle which dipole makes with the electric field is:
Q28. Three identical charges are placed at x-axis from left to right with adjacent charges separated by a distance d. The magnitude of the force on a charge from its nearest neighbour charge is F. Let i be the unit vector along +x axis, then the net force on each charge from left to right is:
Ans. (-5/4 Fi , 0 , +5/4Fi)
Q29. Two students A and B calculate the charge flowing through a circuit. A concludes that 300C of charge flows in 1 minute. B concludes that 3.125 x 1019 electron flows in 1 second. If the current is measured in the circuit is 5 A, then the current calculation is done by:
Ans. both A and B
Q30. The resistance of two wires having the same length and same area of the cross-section is 2 Ω and 8 Ω respectively. If the resistivity of 2 Ω wire is 2.65 x 10-8 Ω-m, then the resistivity of 8 Ω wire is:
Ans. 10.60 x 10-8 Ω-m
Q31. In a certain region electric field E and magnetic field B are perpendicular to each other. An electron enters the region perpendicular to the direction of both E and B moves undeflected. The speed of the equation is:
Q32. A test charge 1.6×10(-19) C is moving with a velocity V = (4i + 3k) in a magnetic field B = (3k + 4i). The force on this test charge:
Ans. 24j N
Q33. In a series LCR circuit, at resonance the current is equal to:
Q34. The frequency of an ac source for which a 10F capacitor has a reactance of 1000 is:
Ans. 50 Hz
Q35. In the given network all capacitors are identical and each one is capacitance C. Which of the following is equivalent capacitance between the point A and B?
Ans. 6 C
Q36. The given figure shows the I – V graph of a copper wire whose length and area of cross section L and A respectively. The slope of this curve become;
Ans. Less the length if the wire is increased.
Q37. When a potential difference V is applied across a conductor at temperature T, the drift velocity of the electron is proportional to:
Q38. Two identical thick wires and two Identical thin wires, all of the same material and the same length from a square in three different ways P, Q and R as shown. Due to the current in these loops the magnetic field at the centre of the loop will be zero in case of:
Ans. P and R only.
Q39. A circular current carrying oil produces a magnetic field BOat its centre. The oil is rewound so as to have three turns as the same current is passed through it. The New magnetic field a the centre is:
Q40. Which one of the following statements is true?
Ans. An inductor can conduct is a dc circuit but not a capacitor.
Q41. If a charge is moved against a coulomb force of an electric field, then the:
Ans. work is done by external sources.
CBSE Class 12 Physics Video Solutions
Candidates can get a general idea of the CBSE’s marking methodology as well as the answer keys. CBSE will release the official CBSE Class 12 answer keys for all subjects shortly after the tests are done, but students who took the exam can use the unofficial answer keys to evaluate their performance. You can also check the video solutions for CBSE Class 12 Physics Term 1 exam from the table below.
|Answer Key Videos||Links|
|CBSE 12th Physics Answer Key 2021-22 by Physics iBro||Click Here|
|CBSE Class 12 Physics Term 1 Paper analysis & Solution||Click Here|
How to Calculate Marks with CBSE Class 12 Answer Keys 2021-22?
These Answer Keys must be used to evaluate candidates’ performance on the Class 12 Physics test. They should use the marking method specified on the question paper to calculate their score. All of this year’s CBSE Class 12 exams will be multiple-choice, with students choosing one of four answers for each question. Even if it differs from the official answer key in certain ways, it can assist candidates in determining a significant amount of their final score. For example, some teachers may provide an answer key to aid students in determining their exam chances. Students can use the direct link to obtain a variety of unofficial CBSE Class 12 Physics 2021-22 answer keys.
CBSE Class 12 Physics Question Paper 2021-22
Physics is a crucial subject in the CBSE curriculum. For the year 2021, the CBSE question paper will be multiple-choice, with no questions requiring descriptive answers. The Physics question paper will be in the same format in both Term 1 and 2. The minor and main examinations were held in November and December. Once all examinations have been completed, the CBSE Question Paper for Physics Exam can be downloaded from the official website. After the exams are done, students can obtain the Question Paper from a variety of unofficial sources.
Importance of CBSE Class 12 Answer Keys 2021-22
The CBSE answer key is an essential component of the process. Shortly after the tests are completed, unofficial Physics answer keys will be distributed. Official answer keys can be used by students to determine what grades they will receive on their Class 12 marksheet. Answer keys from the CBSE can be used to summarise responses, and the grading structure can be utilised to determine raw marks.
CBSE Class 12 Exam Pattern 2021-22
Students can also check the exam pattern followed for CBSE Class 12 term 1 exam from below.
Objective Type: Multiple choice questions (MCQ) will be included in the question paper, including case-based MCQs and MCQs of the assertion-reasoning kind.
Maximum Marks: 50
Duration of Exam: 90 minutes
Question papers will be based on the truncated syllabus, approximately 50% of the entire syllabus.
CBSE Class 12 Results 2021-22
The CBSE intends to complete the 10th-grade exams in February 2022 and releases the results in July 2022. The CBSE’s student portal on the website allows candidates to view their results. Students must enter their Roll Number and Date of Birth in order to obtain their results. The Central Board of Secondary Education will declare the consolidated Results for both terms 1 and 2 once CBSE specialists analyze the Term 2 answer scripts. Class 12 students should keep their CBSE Class 12 Board test results safe because they are important records that they will need throughout their life. The CBSE Board has yet to establish a date for the publication of Class 12 results, which should be available to students and schools by February 2022. The date for the CBSE Class 12 results to be released has yet to be announced.
FAQs on CBSE Class 12 Physics Answer Key 2021-22
The CBSE Exam for Physics Class 12 was conducted on December 10, 2021.
The official answer keys will be released soon. You can find the unofficial answer keys on the websites of coaching centres and various institutes.
Class 12 Physics will be released by the CBSE board.
The official website of the CBSE Board is https://www.cbse.gov.in/
The answer keys of CBSE Class 12 might see slight variation but students can get a rough idea of their scores.
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