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7. Equal charge is given to two metallic spheres of different radii. The potential will be, (a) more on the smaller sphere, (b) more on the bigger sphere, (c) equal on both the spheres, (d) depend on the nature of the materials of the spheres, , 8. A parallel plate capacitor is located horizontally such that one of the plates is, submerged in a liquid while the other is above the liquid surface. When plates are, charged, the level of liquid, , Liquid, , , , , , (a) rises, , (b) falls, , (c) remains unchanged, , (d) may rise or fall depending on the amount of charge, , 9. From the following situations choose the correct one, for which the heat generated by a, , coil connected to a battery is maximum?, , (a) When the coil is directly connected to the battery as such., , (b) When the coil is divided into two equal parts and both parts are connected to the battery, in parallel., , (c) When the coil is divided into four equal parts which are connected to the battery in, parallel., , (d) When only half of the coil is connected to the battery., , 10. Ina potentiometer, null point were obtained at 120 cm and 160 cm with cell of emf, 2.1 V and one unknown emf x V. The value of x is, , (a) 2.4 (b) 1.1 (92.8 (d) 2.1, 11. The plot represents the flow of current through a wire at three different times. The, ratio of charges flowing through the wire at different times, is (see figure), 1A), at Oo, 1, , , , , , , , , , , , , , Time (ns) —>, , 0, 7112345678, =2, , (a)2:1:2 (b)1:3:3 ()1:4:1 (d)2:3:4, , 12. The number of dry cells each of emf 1.5 V and internal resistance 0.5 Q that must be, joined in series with a resistance of 20 Q, so as to send a current of 0.6 A through the, circuit, is, (a)2 (b)8 (©) 10 (d) 12, , We & 7.