12th Std / +2 / Plus Two : Physics Model Question Paper www.biharboard.bih.nic.in

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Document Described : Physics Question Paper, Bihar Question Paper

MODEL PAPER
Class XII
PHYSICS
Time : 3 Hrs. + 15 MinuteExtra] [Total Marks : 70

SECTION : I
OBJECTIVE QUESTIONS :
I. In following Questions Q. No.–1 to 10 there are only one correct answer. You have to choose that correct answer.10 × 1 = 10
1. S.I.unit of flun is
A OhmB WeberC TeslaD None
2. The relation between geometric lenthLg and magnetic lenthLm is–
3 respectively for say of light going to water for glan, the critical only will be

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4. The modulation Index in amplitude modulation is–
A Always zeroBBetween 0 & 1
C Between 1 & 8D None of these
5. Air bulbla inside water shines due to?
A ReflactionB Reflution
C T.I.R.D None of these
6.When a dielectric in introduced into the gap of a parallel plate capacitor, the capacitance of the capacitor:
A DecreasesB Increases
C Remains sameD None of these
7In a double-sit experiment the distance between the slits is 1 mm and the distance of the screen from the slit is 1 m. If light of wavelength 6000Å is used, then the fringe width ß is–
A 0.4 nmB 0.5 nmC 0.6 nmD 0.8 nm
8.The radius of curvature of the path of a charged particle in a uniform magnetic field is directly proportional to the–
ACharge on the particleB Momentum of the particle
CEnergy of the particleD Strength of the field
9. Frequencies in the UHF range normally propagate by means of–
AGround wavesB Sky waves
C Surface wavesDSpace waves
10. The given symbol represents the GATE.
A ANDB ORC NANDD NOR

II. In each question from Q. No. 11 to 15 two statementsStatement I and Statement II are given choice the correct option for each question out of optionsa,b,c andd on the basis of given
statements. 5 × 1 = 5
a If both the statements are true and statement Ii is the correct explanation of statement I.
b If both the statements are true and statement II is not the correct explanation of statement I.
cIf statement I is true and statemejnt Ii is talse.
d If statement I is false and statement II is true.
11. Statement-I: A P. N. Junction diode acts as a natural transister.
Statement-II: P. N. Juction diode operates in the forward bias and does not operate in the reverse bias.
12. Statement-I : According to faraday's electromagnetic induction, the negative rate of change of magnetic flux is
equal to the induced emf.
Statement-II: Lenz's explains the negative sign on the basis of conservation of energy.
13.Statement-I : Energy is released when heavy nuclei undergo fission or light nuclei undergo fusion.
Statement-II: For heavy nuclei, binding energy per nucleon increases with Z while for light nuclei it decreases with increasing Z
14.Statement-I: When a beam of white light passes through a glass, the light splits into constitutent colours.
Statement-II: The dispersion of light takes place because the refractive index of a medium depends on the wavelength of light.
15. Statement-I : If x is suseptibility and T is absolute temperature, the x-T graph of a diatomic substance is a
straight line parallel to T-axis.
Statement-II: Diamagnetic materials follow curie law.

III. Q. No.16 to 18 is for right have more than one correct answer. Select the correct answer to each questions. 3 × 1 = 3
16.Radius of Hyderogen atom.
18. The distance of object from concave mirror of focal lyth 15 cm. so that image is there times magnified.
A 7.5 cmB 10 cmC 17.5 cmD 20 cm.
17.Choke coil is an inducter of
A High reactanceB Low induction
C High resistanceD Low resistance

IV. Q. No. 19 to 22 are of 2 column matching type. Match correctly. 4 × 1 = 4
Column–I Column–II
19. Virtual imge of real object Wave, wavelength of the size of the object
20. Total internal reflectionB Blue colour of sky
21.ScattingCOptical Fibre
22. DiffractionD Convex Mirrore

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Characteristic of PN junction.

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What is meant by electric field?