Bihar Board 12th Physics Answer Key 2024: The Bihar School Examination Board (BSEB) is currently conducting the BSEB Intermediate exams for the academic year 2023-24. As per the timetable, the Class 12th Physics exam was held during the first shift from 9:30 a.m. to 12:15 p.m. After the examination, students are actively searching for the Bihar Board 12th Physics Answer Key 2024 on the internet. The Bihar Board 12th Physics Answer Key 2024, along with answers for all subjects, is scheduled to be released by the BSEB in March. Following the completion of the examination, we provide the unofficial BSEB Physics Answer Key 2024 on this page.
Bihar Board 12th Biology answer key 2024
Section A:
Section B:
Bihar Board 12th english Answer key 2024
Examination Name | Bihar Board 12th Physics Answer Key 2024 |
---|---|
Exam Conducting Body | Bihar School Examination Board |
Mode of Exam | Pen Paper Mode |
Unofficial Answer Key Release Date | 3rd February 2024 |
Official Answer Key Release Date | March 2024 |
Class 12 Physics Total Marks | 100 Marks |
Practical Marks | 30 Marks |
Theory Marks | 70 Marks |
Number of Sections | 2 Sections |
Section A | Objective Type Questions |
Section B | Subjective Type Questions |
Negative Marking | No |
Marking Scheme | - MCQs: 35 Marks (1 Mark x 35) |
- Short Type Questions: 2 Marks x 5 | |
- Short Type Questions: 5 Marks x 3 |
Answer: (A) AND
Q. The width of the forbidden energy gap in the semiconductor approximately (A) 1 eV (B) 10 eV (C) 100 eV (D) 0-01 eVAnswer: (D) 0-01 eV
Q, The equivalent number of decimal number 27 into binary number system will be (A) (10011)2 (B) (10111)2 (C) (11001)2, (D) (11011)2Answer: D
Q. In full wave rectifier, if input frequency is 50 Hz, then output frequency will be (A) 25 Hz (B) 50 Hz (C) 100 Hz (D) 200 HzAnswer: (C) 100 Hz
Q. The device which works of both modulation and demodulation is called (A) Laser (B) Radar (C) Modem (D) FaxAnswer: (C) Modem
Q. Distance of communication satellite from the surface of the earth is (A) 36000 km (B) 36000 mile (C) 3600 km (D) 36000 metreAnswer: (A) 36000 km
Q. Attenuation is measured in (A) ohm (B) decibel (C) mho (D) siemenAnswer: (B) decibel
Q. A magnet is situated near a closed conductor. Current can b produced in the conductor, if (A) only magnet is in motion (B) only conductor is in motion (C) both magnet and conductor are in motion (D) there is relative motion between magnet and conductorAnswer: (D) there is relative motion between magnet and conductor
Q. The value of current obtained in a moving coil galvanometer proportional to (A) deflection (0) (B) resistance (R) (C) magnetic field (B) (D) none of theseAnswer: (A) deflection (0)
Q. A galvanometer is converted into ammeter by adding (A) low resistance in parallel (B) high resistance in series (C) low resistance in series (D) high resistance in parallelAnswer:(A) low resistance in parallel
Q. On dividing any magnet of magnetic moment (M) parallel to it length into n equal pieces, the moment of each piece will be (A) M/n (B) M/n² (c)M/2n (D) MxnAnswer: (A) M/n
Q. Which of the following shows hysteresis? (A) Paramagnetic materials (B) Ferromagnetic materials (C) Diamagnetic materials (D) None of theseAnswer: (B) Ferromagnetic materials
Q. The value of magnetic potential at a distance r from a pole strength m isAnswer: A
Q.Answer: A
Q. An electron of charge e moves parallel to uniform lines of force in magnetic field B with velocity v. Force acting on electron is (A) evB (B) ev/B C) 0 D) Bv/eAnswer: (A) evB
Q. The nature of electron beams moving with uniform velocity in the same direction will be (A) converging (B) diverging (C) Parallel (D) none of theseAnswer: (C) Parallel
Q. S.I. unit of self-induction is (A) coulomb (C) (B) volt (V) (C) ohm (2) (D) henry (H)Answer: (D) henry (H)
Q. The working principle of dynamo is based on (A) heating effect of current (B) electromagnetic induction (C) induced magnetism D) induced currentAnswer: (B) electromagnetic induction
Image formed in compound microscope is (A) real and erect (B) real and inverted (C) virtual and inverted (D) virtual and erectAnswer: (A) real and erect
Q. On oscillating any metallic sphere in the magnetic field, its oscillatory motion is (A) Accelerated (B) Damping (C) Uniform (D) None of theseAnswer: (C) Uniform
Q. Convex lens is used in (A) short-sightedness (B) long-sightedness (C) presbyopia (D) astigmatismAnswer: (B) long-sightedness
Q. The colour of sky is blue due to (A) interference (B) scattering (C) diffraction (D) polarisationAnswer: (B) scattering
The fringe width in interference of light due to two coherent sources is (A) proportional to wavelength (B) inversely proportional to wavelength (c) Proportional to the square of the wavelength (D) Inversely proportional to the square of wavelengthAnswer: (A) proportional to wavelength
Two sources of monochromatic light is coherent, when their (A) intensities are equal (B) amplitudes are equal (C) phases are equal (D) none of theseAnswer: (B) amplitudes are equal
Q. Which of the following is blocked by a capacitor? (A) AC (C) Both AC and DC (B) DC (D) Neither AC nor DCAnswer: (B) DC
Q. Two bulbs of 40 W and 60 W are connected to 220 V source. T ratio of their resistances will be (A) 4:3 (B) 3:4 (C) 2:3 (D)3:2 Q. The resistance of any wire is 500 Ω. Its electrical conductivity will be (A) 0.002 ohm-1 (B) 0.02 ohm -1 (D) 500 ohm-1 (C) 50 ohm-1Answer:(A) 0.002 ohm-1
Q. Two equal resistors are first connected in series and then in parallel. The ratio of maximum and minimum resistances will be (A) 1 – n (B) n (C) 2 n (D) n²Answer: (D) n²
Q.Answer; A
Answer: (B)
Q. increase the sensitivity of a potentiometer (A) the cross-section area of its wire will have to be increased (B) current in its wire will have to be decreased (C) current in its wire will have to be increased (D) length of its wire will have to be increased Q. Kirchhoff’s second law of electricity is related to (A) conservation of mass (B) conservation of charge (C) conservation of energy (D) conservation of momentum Q. Which one of the following is not a unit of magnetic field ? (A) tesla (B) weber / metre2 (C) newton/ampere-metre (D) newton/ ampere 2 Q. Unit of linear charge density (A) coulomb/metre (B) coulomb x metre (C) metre/coulomb (D) none of these Q. Two equal and opposite charges of 5 coulomb are kept mutually at a distance of 5-0 cm. The electric dipole moment of the system isAnswer: 25X 10-2 C/m
Q. If magnetic field B is perpendicular to surface area vector then the magnetic flux on ds area will beAnswer; 0
Q. Unit of reactance isAnswer: Henry
Q. Mean value of alternating current in a full cycle is (A) I (B) I/2 (D) zero (C) 2IAnswer: (D) zero
Q. If the phase difference between alternating current and e.m.f. is, ∅ then the value of power factor isAnswer: Cos ∅
Q. In AC circuit, power is lost in only (A) resistance (B) inductance (C) capacitance (D) all of these Q. Large virtual image of object is formed by (A) concave mirror (C) plane mirror (B) convex mirror (D) concave lensStep 1: Visit the official website.
Step 2: Navigate to the home page and select the Physics subject, followed by the set number of the Bihar Board Class 12 Answer Key 2024.
Step 3: Choose the question number and specify the issue type.
Step 4: Select the correct answers and provide an explanation for the objection.
Step 5: Click the save button, and the objection will be submitted.
Check below for a sample image of the BSEB Class 12th Physics answer key objection window.