Part – A: I. Pick the correct option among the four given options for ALL of the following questions: 1. A glass rod is rubbed with silk cloth. The charge acquired by glass rod is __________ . (A) negative (B) positive (C) zero (D) positive on one end and negative on the opposite end
2. A spherical conductor of radius R is carrying a charge of +Q. The ratio of the electric potentials corresponding to a point on the surface of the conductor and a point at a distance R/2 from the centre of the conductor are in the ratio (A) 1: 2 (B) 2: 1 (C) 1:1 (D) 4:1
3. The resistivity of a metallic conductor ______________ with decrease in temperature. (A) increases (B) decreases (C) first increases and then decreases (D) first decreases and then increases
4. The Lorentz force is the force on a charged particle moving in a region containing _____________ . (A) only electric field (B) only magnetic field (C) both electric and magnetic fields (D) only crossed electric and magnetic fields
5. Below are the two statements related to magnetic field lines: Statement-I : The magnetic field lines do not intersect. Statement-II: The direction of magnetic field at a point is unique. (A) Both the statements I and II are correct and II is the correct explanation for I (B) Both the statements I and II are correct and II is not the correct explanation for I (C) Statement I is wrong but the statement II is correct (D) Statement I is correct but the statement II is wrong
6. A straight conductor of length ‘l’ is moving with a velocity ‘v’ in the direction of uniform magnetic field of strength ‘B’. The magnitude of emf induced between the ends of the conductor is (A) Blv (B)Blv/2 (C) 0 (D) 2Blv
7. The SI unit of magnetic flux is: (A) Wb m-1 (B) T m-2 (C) weber (D) Wb m-2
8. The average power dissipated in an ac circuit is maximum if the ac source is connected : (A) only to pure resistor (B) only to pure inductor (C) only to pure capacitor (D) to a series combination of capacitor and inductor
9. The electromagnetic waves with lowest frequency among the following are : (A) gamma rays (B) UV rays (C) microwaves (D) radio waves
10. A ray of light coming from an object which is incident parallel to the principal axis of a convex lens placed in air after refraction __________. (A) appears to diverge from first principal focus (B) emerges without any deviation (C) appears to diverge from second principal focus (D) passes through second principal focus
11. If unpolarised light of intensity ‘I0’ is passed through a polaroid, the intensity of emergent light is (A) I0/4 (B) 2I0/4 (C) I0/3 (D) I0/2
12. The following are the statements related to photo emission: (i) Photoelectric current is independent of intensity of incident radiation. (ii) Stopping potential is different for different photosensitive metal surfaces for a radiation of particular frequency (ν > νo). (iii) Maximum speed of photoelectrons is independent of frequency of incident radiation. (iv) Saturation current is different for radiations of different intensities having same frequency.
(A) Only (i) and (iii) are correct (B) Only (i) and (ii) are correct (C) Only (iii) and (iv) are correct (D) Only (ii) and (iv) are correct
13. The minimum energy required to free the electron from the ground state of a hydrogen atom is (A) 0.85 eV (B) 3.4 eV (C) 13.6 eV (D) 1.51 eV
14. The radioactive decay in which a helium nucleus is emitted is called __________. (A) gamma decay (B) alpha decay (C) negative β decay (D) positive β decay
15. In the figure, EV and EC are the valence band and conduction band corresponding to an extrinsic semiconductor. E is the energy state corresponding to the impurity present in it. The impurity present in it can be (A) arsenic . (B) indium (C) phosphorous (D) antimony
II. Fill in the blanks by choosing appropriate answer given in the bracket for ALL the following questions: ( maximum, decrease, thermonuclear fusion, generator, increase, cell)
16. A convenient way to increase the current sensitivity of a galvanometer is to __________ the number of turns of the coil. 17. The device used to convert mechanical energy into electrical energy is called a _______________. 18. If two waves coming from two coherent sources superpose at a point in phase, then the intensity of light at that point is ___________ . 19. The source of energy output in the interior of stars is _______________________. 20. The width of depletion region of a pn-junction diode will_____________ on increasing the forward bias voltage.
Part – B: III. Answer any FIVE of the following questions: 21. Mention any two basic properties of electric charges. 22. The amount of work done in bringing a point charge of 3 mC from infinity to a point P is 0.06 J. Find the electric potential at the point P. 23. Write the expression for magnetic force per unit length between two long straight parallel conductors carrying current. Give the nature of force between two parallel conductors carrying current in same direction. 24. State and explain Gauss’s law in magnetism. 25. Mention any two factors on which self inductance of a long solenoid depends. 26. Briefly explain the construction of a transformer. 27. What is displacement current? Give expression for the same. 28. Write the two conditions required for total internal reflection. 29. Differentiate conductors from insulators on the basis of band theory of solids.
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