| 1. The electrostatic force per unit charge is known is _________. | (b) |
| 2. A circle of radius r is drawn with a charge +q is placed at the centre. The work done in moving a point charge around the circumference of the circle is __________. | zero |
| 3. Which of the following gives the polarity of the induced emf? | (ii) |
| 4. The frequencies of the gamma rays, ultraviolet rays, and x-rays are v1, v2, and v3 respectively. Then __________ | (ii) |
| 5. If the radius of the first electron orbit is r0, radius of thr second electron orbit of hydrogen is _________________. | 4r0 |
| 6. Two thin lenses of power +4D and -2D are in contact. The focal length of the combination is ______. | -1/4 |
| 7. __________ process is responsible for the production of energy in the sun | Nuclear fusion |
| 8. Show that the resistance of a conductor can be expressed by R=ml/(ne2τA) | To be Added Here |
| 9. Relative permeability of a material μr< 1, identify the magnetic material. Write the relation between the relative permeability and magnetic susceptibility. | μr=1+χ |
| 10. The instantaneous curent and voltage of an ac circuit are given by i=10sin314t Ampere and v=50sin(314t+π/2) Volt. What is the
(a) phase difference between voltage and current?
(b) power dissipation in the circuit? | (a) π/2
(b) zero |
| 11. (a) Which elecrtomagnetic wave is used in cellular phones to transmit voice communications?
(b) In the process of charging of a parallel plate capacitor, the current produed between the plates of the capacitor is _________ | (a) Radiowaves
(b) (iii) |
| 12. (a) Define wavefront.
(b) Figure shows a plane wavefront incident on a convex lens, draw the corresponding refracted wavefront. | (a) A wavefront is a surface of constant phase representing the leading edge of a propagating wave in a medium.
(b) spherical |
| 13. What is meant by ionisation energy? Write its value for hydrogen atom. | 13.6 eV |
| 14. The carbon isotope 6C12 has a nuclear mass of 12.000000u. Calculate the binding energy of its nucleus. | 92.16 MeV |
| 15. (b) Write an expression for torque acting on an electric dipole pleaced in a uniform electric field. When will it become maximum? | To be Added Here |
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