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Page 1: jiyg;gpw;F fPNo cs;s ypq;if fpspf; nra;J FOtpy; ,izaTk;! ) · 2/12/2020  · Answer any SIX of the following questions : (33 compulsory) 6 x 3 = 18 25. State and explain Kirchhoff’s

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Page 2: jiyg;gpw;F fPNo cs;s ypq;if fpspf; nra;J FOtpy; ,izaTk;! ) · 2/12/2020  · Answer any SIX of the following questions : (33 compulsory) 6 x 3 = 18 25. State and explain Kirchhoff’s

SHRI KRISHNA ACADEMY NEET,JEE AND BOARD EXAM COACHING CENTRE

SBM SCHOOL CAMPUS,TRICHY MAIN ROAD,NAMAKKAL CELL:9965531727-9443231727

FULL TEST

CLASS: XII TIME : 3.00 Hours

SUBJECT: PHYSICS MARK: 70

I.Choose and write the correct answer 15x1=15 1. On the perpendicular bisector of an electric dipole, the electric intensity E and potential V are

(a) E = 0, V = 0 (b) E ≠ 0, V ≠ 0 (c) E ≠ 0, V = 0 (d) E = 0, V ≠ 0

2. Two wires of A and B with circular cross section made up of the same material with equal lengths. Suppose RA = 3

RB, then what is the ratio of radius of wire A to that of B?

(a) 3 (b) 3 (c) 1 / 3 (d) 1 / 3

3. Three wires of equal lengths are bent in the form of loops. One of the loops is circle, another is a semi-circle and the

third one is a square. They are placed in a uniform magnetic field and same electric current is passed through them.

Which of the following loop confi guration will experience greater torque ?

(a) circle (b) semi-circle (c) square (d) all of them

4. An electron moves on a straight line path XY as shown in the figure. The coil abcd is adjacent to the path of the

electron. What will be the direction of current, if any, induced in the coil?

(a) The current will reverse its direction as the electron goes past the coil

(b) No current will be induced

(c) abcd

(d) adcb

5. Which of the following is NOT true for electromagnetic waves?

(a) it transport energy

(b) it transport momentum

(c) it transport angular momentum

(d) in vacuum, it travels with different speeds which depend on their frequency

6. A rod of length 10 cm lies along the principal axis of a concave mirror of focal length 10 cm in such a way that its

end closer to the pole is 20 cm away from the mirror. The length of the image is,

(a) 2.5 cm (b) 5cm (c) 10 cm (d) 15cm

7. Emission of electrons by the absorption of heat energy is called………emission.

a) photoelectric b) field c) thermionic d) secondary

8. The nucleus is approximately spherical in shape. Then the surface area of nucleus having mass number A varies as

(a) A2/3

(b) A4/3

(c) A1/3

(d) A5/3

9. If the input to the NOT gate is A = 1011, its output is

a. 0100 b. 1000 c. 1100 d. 0011

10. Space wave propagation is particularly suitable for the waves having frequency……………

a)above 40 MHz b)below 30MHz c)below 20 MHz d)above 30 MHz

11. Two ions having masses in the ratio 1 : 1 and charges 1 : 2 are projected into uniform magnetic field perpendicular to

the field with speeds in the ratio 2 : 3. The ratio of the radii of circular paths along which the two particles move is

a) 4 : 3 b) 2: 3 c) 3 : 1 d) 1 : 4

12. A rectangular loop carrying a current i is situated near a long straight wire such that the wire is parallel to one of the

sides of the loop. If a steady current I is established in the wire, as shown in the figure the loop will

a) rotate about an axis parallel to the wire I

b) move away from the wirei

c) move towards the wire

d) remains stationary

13. Three metals have work functions in the ratio 2 : 3 : 4. Graphs are

drawn for all connecting stopping potential and incident frequency. The graphs have slopes in the ratio

a) 2 : 3 : 4 b) 4 : 3 : 2 c) 6 : 4 : 3 d) 1 : 1 : 1

14. A radio isotope has a half – life of 5 years. The fraction of the atoms of this material that would decay in 15 years

will be

a) 1/8 b) 2/3 c) 7/8 d) 5/8

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Page 3: jiyg;gpw;F fPNo cs;s ypq;if fpspf; nra;J FOtpy; ,izaTk;! ) · 2/12/2020  · Answer any SIX of the following questions : (33 compulsory) 6 x 3 = 18 25. State and explain Kirchhoff’s

15. Match the following:

i) (A+B)(A+C) A) AB + AC

ii) (A+B)(𝐴 + B) B) AB

iii) A (𝐴 + B) C) A = BC

iv) A (B + C) D) AB + 𝐴 C

a) i - C, ii - A, iii - B, iv - D b) i - C, ii - D, iii - B, iv - A

c) i - A, ii - C, iii - B, iv - D d) i - A, ii - C, iii - D, iv - B

II. Answer any SIX of the following questions : (24 compulsory) 6 x 2 = 12

16. Distinguish between polar and non polar molecules.

17. Five resistors are connected in the configuration as shown in the figure.

Calculate the equivalent resistance between the points a and b.

18. State Tangent law.

19. Why does sky appear blue and clouds appear white?

20. Calculate the cut-off wavelength and cut-off frequency of x-rays from an x –ray tube

of accelerating potential 20,000 V.

21. Write down the draw backs of Bohr atom model.

22. Consider an ideal junction diode.

Find the value of current flowing through AB is

23. Define skip zone.

24. An inductor blocks AC but it allows DC. Why? and How?

III. Answer any SIX of the following questions : (33 compulsory) 6 x 3 = 18

25. State and explain Kirchhoff’s rules.

26. i) Suppose a cyclotron is operated to accelerate protons with a magnetic field of strength 1 T. Calculate the frequency

in which the electric field between two dees could be reversed.

ii) can we accelerate neutrons using the above setup. Justify.

27. An inductor of inductance L carries an electric current i. How much energy is stored while establishing the current in

it?

28. Write short notes on (a) X - ray (b) radio waves.

29. What is Fresnel’s distance? Obtain the equation for Fresnel’s distance.

30. List out the laws of photoelectric effect.

31. Calculate the amount of energy released when 1 kg of 𝑈92235 undergoes fission reaction.

32. Distinguish between avalanche and zener breakdown.

33. Two conducting spheres of radius r1= 8 cm and r2= 2 cm are

separated by a distance much larger than 8 cm and are connected

by a thin conducting wire as shown in the figure. A total charge

of Q = +100 nC is placed on one of the spheres. After a fraction

of a second, the charge Q is redistributed and both the spheres

attain electrostatic equilibrium.

(a) Calculate the charge and surface charge density on each sphere.

(b) Calculate the potential at the surface of each sphere.

IV. Answer any FIVE of the following questions : 5 x 5 = 25

34. Obtain an expression for the force on a current carrying conductor placed in a magnetic field.

(OR)

What is modulation? Explain the types of modulation with necessary diagrams.

35. Describe the Fizeau’s method to determine speed of light.

(OR)

Explain the working of a single-phase AC generator with necessary diagram.

36. Explain the construction and working of a full wave rectifier.

(OR)

Explain the effect of potential difference on photoelectric current..

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Page 4: jiyg;gpw;F fPNo cs;s ypq;if fpspf; nra;J FOtpy; ,izaTk;! ) · 2/12/2020  · Answer any SIX of the following questions : (33 compulsory) 6 x 3 = 18 25. State and explain Kirchhoff’s

37. Discuss the Millikan’s oil drop experiment to determine the charge of an electron.

(OR)

Derive an expression for electrostatic potential due to an electric dipole. Discuss the special cases.

38. Obtain the equation for bandwidth in Young’s double slit experiment.

(OR)

Explain the determination of the internal resistance of a cell using potentiometer.

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