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1. The electrostatic force per unit charge is known is _________.
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(b)
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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 __________.
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zero
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3. Which of the following gives the polarity of the induced emf?
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(ii)
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4. The frequencies of the gamma rays, ultraviolet rays, and x-rays are v1, v2, and v3 respectively. Then __________
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(ii)
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5. If the radius of the first electron orbit is r0, radius of thr second electron orbit of hydrogen is _________________.
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4r0
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6. Two thin lenses of power +4D and -2D are in contact. The focal length of the combination is ______.
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-1/4
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7. __________ process is responsible for the production of energy in the sun
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Nuclear fusion
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8. Show that the resistance of a conductor can be expressed by R=ml/(ne2τA)
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To be Added Here
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9. Relative permeability of a material μr< 1, identify the magnetic material. Write the relation between the relative permeability and magnetic susceptibility.
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μr=1+χ
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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?
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(a) π/2
(b) zero
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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 _________
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(a) Radiowaves
(b) (iii)
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12. (a) Define wavefront.
(b) Figure shows a plane wavefront incident on a convex lens, draw the corresponding refracted wavefront.
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(a) A wavefront is a surface of constant phase representing the leading edge of a propagating wave in a medium.
(b) spherical
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13. What is meant by ionisation energy? Write its value for hydrogen atom.
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13.6 eV
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14. The carbon isotope 6C12 has a nuclear mass of 12.000000u. Calculate the binding energy of its nucleus.
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92.16 MeV
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15. (b) Write an expression for torque acting on an electric dipole pleaced in a uniform electric field. When will it become maximum?
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To be Added Here
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