Bihar Board Physics Answer Key- Set J
Get the Answer Key of Set J of Bihar Board Physics Objective Questions that was asked in Bihar Board Inter/12th Annual Exam 2020.
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Ques 1: – Optical path is equal to
Ans: – Refractive index X Path- Lenght
Ques 2: – Dimension of Planck’s constant is
Ans: – ML2T-1
Ques 3: – The resistance of ammeter is
Ans: – Very Small
Ques4: – Which of the relation is correct for the maginfication power of compound microscope
Ans: – B
Ques5: – Iron is
Ans: – Ferromagnetic
Ques 6: – Which of the following series of hydrogen spectrum is in visible range
Ans: – Balmer
Ques 7: – A hot wire ammeter measures
Ans: – average value of alternating current
Ques 8: – Electron volt is a unit of
Ans: – Energy
Ques 9: – The symbol represents which gate
Ans: – AND
Ques 10: – Dimension of charge is
Ans: – AT
Ques 11: – Which of the relations is correct for radioactive atom?
Ans: –
Ques 12: – Width of interfrence fringe is
Ans: –
Ques 13: – Sum of charges on collecting plate and condensing plate of a charges capacitor is
Ans: –Zero
Ques14: – The binary decimal number of 25 is
Ans: – (1101)2
Ques 15: – Wave length of a Particle of Mass m Moving with Velocity V is
Ans: – h/mv
Ques 16: – The refractive index of diamond is about
Ans: – 2.42
Ques 17: – 1 volt is equal to
Ans: – 1JC-1
Ques 18: – Beta rays are fast moving
Ans: – Photons
Ques19: – On increasing the lenght of tube of compound microscope, magnifying power
Ans: – decreases
Ques 20: – 1 AMU is equal to
Ans: – 1.6 x 10-19 kg
Ques 21:-The relation between geometrical Length of a Mangnet and its Magnetic Length Lm is
Ans- Lm= 5/6Mg
Ques 22:- Unit of F Celon E0 is
Ans- Fm-1
Ques 23:- Which of the following is not electromagnetic wave?
Ans- X rays
Ques 24:- On going from north Pole to equator, the value of angle of dip
Ans- Increases
Ques 25:- The lens which is used to remove short sightedness is
Ans- Concave
Ques 26:- The velocity of light is maximum in
Ans- Vaccum
Ques 27:- Nature of Electromagnetic wave is
Ans- Both Transverse and Logitudinal
Ques 28:- Kilowatt Hour is unit of
Ans- Electric Energy
Ques 29:- The value of red colour in colour code of carbon resistance is
Ans- 2
Ques 30:- Which quantity decreases in step-down transformer ?
Ans- Voltage
Ques 31: – Impedance of LR Circuit?
Ans- D
Ques 32:- If ᵑ is the angle of dip at a place, then the expression for tan ᵑ?
Ans- Bh/Bv
Ques 33:- The power of the convex lens of focal length 20 cm in diopter is?
Ans- 5
Ques 34:- The least stable nucleus is
Ans- 42HE
Ques 35:- Two capacitors each of capacity C are connected in parallel. The equivalent capacity is
Ans- 2C
Ques 36: – y —rays are similar to
Ans- Alpha Rays
Ques 37: Density of Nuclues is about ?
Ans- 2.29 x 10-7
Ques 38 : Which of the expression is correct for Lorentz force?
Ans- A
Ques 39: The atomic number decrease with the emission of alpha particle from the nucleus by
Ans-
Ques 40:- majority carriers in p-type semiconductor
Ans- Electron
Ques 41:- Cathode rays are
Ans- Electron
Ques 42:- Which of the following has unit Volt/Metre?
Ans-
| Q No | Answer | Q No | Answer |
| 1 | 22 | ||
| 2 | 23 | ||
| 3 | 24 | ||
| 4 | 25 | ||
| 5 | 26 | ||
| 6 | 27 | ||
| 7 | 28 | ||
| 8 | 29 | ||
| 9 | 30 | ||
| 10 | 31 | ||
| 11 | 32 | ||
| 12 | 33 | ||
| 13 | 34 | ||
| 14 | 35 | ||
| 15 | 36 | ||
| 16 | 37 | ||
| 17 | 38 | ||
| 18 | 39 | ||
| 19 | 40 | ||
| 20 | 41 | ||
| 21 | 42 |
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