यदि आप भी 5 फरवरी को Bihar Board 12th Physics एग्जाम दिए हैं, और Bihar Board 12th Physics Answer Key 2025 देखना चाहते हैं आप सही जगह आए हुए हैं इस आर्टिकल में आपको 100% Correct Answer 12th Physics Answer Key 2025 का दिया गया है तो जल्दी से आप Bihar Board 12th Physics 05 february Answer key 2025 का मिलान कर ले।
Bihar Board 12th Physics Answer Key 2025
The Bihar Board 12th Physics Answer Key for 2025 has been released on 05 February 2025. Students who appeared for the exam can now check the answer key to verify which options are correct.
This will help in assessing their performance and estimating their scores before the official result declaration. To access the answer key, visit the onlineprocess.co.in.
BSEB Class 12 Physics Answer Key 2025: Overview
| बोर्ड का नाम | बिहार स्कूल परीक्षा बोर्ड (BSEB) |
| Category | Answer Key |
| Bihar Board 12th Biology 2025 Question Paper | Click Here |
| Bihar Board 12th Physics 2025 Question Paper | Click Here |
| Exam Date | 5 फरवरी 2025, सुबह 9:30 AM से 12:45 PM तक |
| आधिकारिक वेबसाइट | www.biharboardonline.bihar.gov.in |
| Patter of Question Paper | वस्तुनिष्ठ (MCQs) – 35, लघु उत्तरीय (Short Answer) – 10, दीर्घ उत्तरीय (Long Answer) – 3 |
Bihar Board 12th Physics Answer Key 2025 (100% Correct Answer)
- In a purely inductive circuit, the power factor is
(A) 0
(B) 1
(C) 0.5
(D) infinity
Answer: (A) 0 - In an a.c. circuit containing only capacitor, the phase difference between current and voltage is
(A) 0°
(B) 90°
(C) 180°
(D) 45°
Answer: (B) 90° - In resonance condition, the frequency of L-C circuit is
(A) 12π1LC2π1LC1
(B) 2π1LC2πLC1
(C) 2πLC2πLC
(D) 12πLC2π1LC
Answer: (B) 2π1LC2πLC1 - In a step-up transformer, the value of current in secondary coil compared to the primary coil is
(A) equal
(B) less
(C) more
(D) no relation between the two
Answer: (B) less - Image formed by convex mirror is always
(A) in between centre of curvature and focus
(B) in between centre of curvature and infinity
(C) in between pole and focus
(D) none of these
Answer: (C) in between pole and focus - If the critical angle for total internal reflection from any medium to vacuum is 30°, then the velocity of light in the medium is
(A) 3×108 m/sec3×108m/sec
(B) 1.5×108 m/sec1.5×108m/sec
(C) 6×108 m/sec6×108m/sec
(D) 4.5×108 m/sec4.5×108m/sec
Answer: (B) 1.5×108 m/sec1.5×108m/sec - If two converging lenses of equal focal length ff are kept in contact, then the focal length of the combination will be
(A) ff
(B) 2f2f
(C) f22f
(D) 3f3f
Answer: (C) f22f - Power of a convex lens is 2 dioptre. Its focal length will be
(A) 20 cm
(B) 50 cm
(C) 40 cm
(D) 60 cm
Answer: (B) 50 cm - Which of the following is used to reduce chromatic aberration in lenses?
(A) Convex lens
(B) Concave lens
(C) Achromatic combination
(D) Cylindrical lens
Answer: (C) Achromatic combination - A convex lens is dipped in a liquid, whose refractive index is equal to the refractive index of the material of the lens. Then its focal length will
(A) become zero
(B) become infinity
(C) reduce
(D) increase
Answer: (B) become infinity - The bubble of soap appears coloured due to
(A) diffraction
(B) polarization
(C) interference
(D) reflection
Answer: (C) interference - Which of the following cannot be polarized?
(A) Sound waves
(B) Light waves
(C) Radio waves
(D) X-rays
Answer: (A) Sound waves - A person uses spectacles (lens) of + 2D power. His defect of vision is
(A) myopia
(B) hypermetropia
(C) presbyopia
(D) astigmatism
Answer: (B) hypermetropia - Two light waves of equal amplitude and equal wavelengths are superimposed. The amplitude of the resultant wave will be maximum when phase difference between them is
(A) zero
(B) π44π
(C) π22π
(D) ππ
Answer: (A) zero - In polarised light the angle between plane of vibration and plane of polarization is
(A) 0°
(B) 45°
(C) 90°
(D) 180°
Answer: (C) 90° - Which of the following is not an electromagnetic wave?
(A) Alpha rays
(B) Gamma rays
(C) Infrared rays
(D) X-rays
Answer: (A) Alpha rays - The wavelength of de Broglie wave associated with any moving particle does not depend on
(A) mass
(B) charge
(C) velocity
(D) momentum
Answer: (B) charge - The formula of kinetic mass of photon is
(A) ℏvccℏv
(B) ℏvc2c2ℏv
(C) ℏcvvℏc
(D) c2ℏvℏvc2
Answer: (B) ℏvc2c2ℏv - A capacitor of 100 μFμF is charged to 100 volt. The energy stored will be
(A) 0·5 joule
(B) 5 joule
(C) 50 joule
(D) 100 joule
Answer: (A) 0·5 joule - Which of the following has unit volt-metre−1−1?
(A) Electric flux
(B) Electric potential
(C) Electric field
(D) Electric capacity
Answer: (C) Electric field - The relation between drift velocity vv of free electrons in conductor in electric conduction and potential difference VV between ends of conductor is
(A) proportional to VV
(B) inversely proportional to VV
(C) proportional to V2V2
(D) inversely proportional to V2V2
Answer: (A) proportional to VV - The graph between voltage VV of a conductor and current II is a straight line, which makes an angle θ with y-axis (which represents II). The resistance of the conductor will be
(A) tanθ
(B) cotθ
(C) sinθ
(D) cosθ
Answer: (B) cotθ - Power of electric circuit is
(A) V.RV.R
(B) V2.RV2.R
(C) V2/RV2/R
(D) V2.R.IV2.R.I
Answer: (C) V2/RV2/R - Which of the following represents resistance RR? (ρ=resistivityρ=resistivity)
(A) ρ⋅(lA)ρ⋅(Al)
(B) ρ⋅(Al)ρ⋅(lA)
(C) lρAρAl
(D) lAρρlA
Answer: (A) ρ⋅(lA)ρ⋅(Al) - What is the main difference between isotopes of the same element?
(A) Number of protons
(B) Number of neutrons
(C) Number of electrons
(D) Atomic number
Answer: (B) Number of neutrons - Which one of the following is not a type of radioactive decay?
(A) Alpha decay
(B) Beta decay
(C) Gamma decay
(D) Muon decay
Answer: (D) Muon decay - Which of the following is chargeless particle?
(A) αα-particle
(B) ββ-particle
(C) Proton
(D) Photon
Answer: (D) Photon - X-rays are
(A) moving electron
(B) moving positive ions
(C) moving negative ion
(D) electromagnetic waves
Answer: (D) electromagnetic waves - Equivalent energy of 1 amu is
(A) 190 MeV
(B) 139 MeV
(C) 913 MeV
(D) 931 MeV
Answer: (D) 931 MeV - The relative permeability (μrμr) of ferromagnetic substance is
(A) μr<1μr<1
(B) μr=1μr=1
(C) μr>1μr>1
(D) μr>1μr>1
Answer: (C) μr>1μr>1 - In series circuit with resistors R1,R2R1,R2 and R3R3, the current flowing through each resistor is
(A) same
(B) different
(C) zero
(D) divided proportionally to the value of resistance
Answer: (A) same - Two equal positive point charges of 1 μC charge are kept at a distance of 1 metre in air. The electric potential energy of the system will be
(A) 1 joule
(B) 1 eV
(C) 9×10−39×10−3 joule
(D) zero
Answer: (C) 9×10−39×10−3 joule - Which one of the following is unit of capacity?
(A) coulomb
(B) ampere
(C) volt
(D) coulomb/volt
Answer: (D) coulomb/volt - The capacity of any condenser does not depend upon
(A) shape of plates
(B) size of plates
(C) charge on plates
(D) distance between plates
Answer: (C) charge on plates - Gauss’s law states that the electric flux through a closed surface is
(A) proportional to the charge enclosed
(B) inversely proportional to the charge enclosed
(C) zero
(D) proportional to the square of the charge enclosed
Answer: (A) proportional to the charge enclosed - When boron is mixed as impurity in silicon, then resultant matter is
(A) n-type semiconductor
(B) p-type semiconductor
(C) n-type conductor
(D) p-type conductor
Answer: (B) p-type semiconductor - In n-type semiconductor the minority charge carrier is/are
(A) electrons
(B) holes
(C) electron and hole
(D) none of these
Answer: (B) holes - Which logic gate’s output is true only if the inputs are different?
(A) OR gate
(B) AND gate
(C) NOT gate
(D) XOR gate
Answer: (D) XOR gate - Reverse biased diode is
(A) Zener diode
(B) LED
(C) Photodiode
(D) both (A) and (C)
Answer: (D) both (A) and (C) - Which of the following laws is based on the principle of energy-conservation?
(A) Ampere’s law
(B) Faraday’s law of electrolysis
(C) Lenz’s law
(D) None of these
Answer: (C) Lenz’s law - When an ammeter is shunted then its measurement limit
(A) increases
(B) decreases
(C) remains unchanged
(D) none of these
Answer: (A) increases - Dimensional formula of permeability is
(A) [MLT−2A−2][MLT−2A−2]
(B) [MLT2A−2][MLT2A−2]
(C) [MLT2A2][MLT2A2]
(D) [MLT−2A][MLT−2A]
Answer: (A) [MLT−2A−2][MLT−2A−2]
Bihar Board से जुड़ी सभी प्रकार की अपडेट के लिए Whatsapp Group में जुड़े।
| Join Telegram | Click Here |
| JOin WhatsApp Group | Click Here |
ये भी पढ़े:
- DeepSeek Banned: जानिए क्यों अलग-अलग देश Chinese AI चैटबॉट ‘DeepSeek’ को बैन कर रहे हैं
- Bihar Board 12th Physics Answer Key 2025 (100% Correct Answer) – 05 February देखें 12th Physics Answer Key 2025
- Pradhan Mantri Awas Yojana Survey List 2025:
- TEC Kya Hota Hai? TEC Certificate Number Kaise Milega? TEC Certificate Registration और Download पूरी जानकारी हिंदी में
- Bihar Board 10th Exam Date 2025: बिहार बोर्ड 10वी परीक्षा की तिथि जारी, यहाँ से डाउनलोड करे
Shubham Kumar is a passionate blogger with a deep interest in providing the latest information on jobs, education, scholarships, and government schemes. His mission is to empower his readers with the knowledge they need to achieve their goals and lead fulfilling lives.
