physics objective class 12 bihar board
15. COMMUNICATION SYSTEMS( Objective Question Answer 2022 )
1. Who undertook the first space walk and in which year ? (A) Leonov, 1965 (B) Neil Armstrong, 1969 (C)…
Read More »14. SEMI CONDUCTOR ELECTRONICS : ATERIALS, DEVICES & SIMPLE CIRCUITS( Objective Question Answer 2022 )
1. Bonds in a semiconductor : (A) trivalent (B) covalent (C) bivalent (D) monovalent Answer ⇒ B 2. Number of…
Read More »13. NUCLEI( Objective Question Answer 2022 )
1. How many electrons are contained in 23892U nucleus ? (A) 92 (B) 146 (C) 238 (D) O Answer ⇒…
Read More »11. DUAL NATURE OF MATTER AND RADIATION( Objective Question Answer 2022 )
1. De-Broglie equation states the : (A) dual nature (B) particle nature (C) wave nature (D) none of these Answer…
Read More »10. WAVE OPTICS( Objective Question Answer 2022 )
1. Poisson’s bright spot was discovered by: (A) Fresnel (B) Rayleigh (C) Poisson (D) Fraunhoffer Answer ⇒ C 2.…
Read More »9. RAY OPTICS AND OPTICAL INSTRUMENTS( Objective Question Answer 2022 )
1. Which of the following is not a property of light ? (A) It can travel through vacuum (B) It…
Read More »8. ELECTROMAGNETIC WAVES( Objective Question Answer 2022 )
1. The dimensional formula of E is : (A) [MLT-2A-1] (B) [MLT-3A-1] (C) [MLT-2A-2] (D) None of these Answer ⇒…
Read More »7. ALTERNATING CURRENT( Objective Question Answer 2022 )
1. Power factor of an ac circuit is a measure of: (A) virtual power (B) power lost in the circuit…
Read More »6. ELECTROMAGNETIC INDUCTION( Objective Question Answer 2022 )
1. Which of the following is not equal to a henry ? Answer ⇒ C 2. 1 henry is equal…
Read More »5. MAGNETISM AND MATTER( Objective Question Answer 2022 )
1. Which of the following has a low value in ferrites ? (A) Conductivity (B) Permeability (C) Magnetic susceptibility (D)…
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