2nd PUC Physics Series-12 December 3, 2020December 23, 2020wefru PUC Science 2nd Year Physics Series-12 quiz 0 Created on December 02, 2020 By wefru 2nd PUC Physics Series 12 TEST YOUR KNOWLEDGE OF SCIENCE 1 / 10 111. The resistance of an aluminium wire is/i. It is stretched to /i times its original length. Its new resistance will be : nr n²r n2r rn2 2 / 10 112. A wire P is half the diameter and half the length of a wire Q of similar material. The ratio of resistances of P to that 0 is: 2 : 1 2 : 7 2 : 8 2 : 9 3 / 10 113. What is the resistance across A and B in the network in Fig.? R 2 R R2 6 R 4 / 10 114. When the wires are connected in parallel, the heat produced in the thinner wire is H1 and that in the thicker wire is H2 Then: H1 = H2 H1 < H2 H1 > H2 H1 ≥ H2 5 / 10 115. Two equal resistors are connected in series across a battery and consume a power of P. If these are connected in parallel, then the’ power consumed will be: 2P 4P p4 P 6 / 10 116. Thermo electricity was discovered by: Joule Peitier Thomson Seebeck 7 / 10 117. Thermo emf is the order of: 10 V 10-3 V 10-6 V 10-12 V 8 / 10 118. The coupling co-efficient of the perfectly coupled coils is: 1 2 34 5 9 / 10 119. An e– and a p– are moving parallel to each other in a magnetic field. The magnetic force acting on the p+ is: 1840 times that on e– less than that of e– same as that of e– slightly more than that of e– 10 / 10 Q.120 A transformer is used to light 100 W and 110 V lamp from a 220 V mains. If the main current is 0.5 A. Then the efficiency of the transformer is: 11% 90% 101% 611% Your score isThe average score is 0% LinkedIn Facebook Twitter VKontakte 0% Restart quiz