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51.	In the arrangement shown in figure, there are two coils wound on a non-conducting cylindrical rod. Initially the key is not inserted. Then the key is inserted and later removed. Then:A. (a) the deflection in the galvanometer remains zero throughoutB. (b) there is a momentary deflection in the galvanometer but it dies out shortly and there is no effect when the key is removedC. (c) there are momentary galvanometer deflections that die out shortly, the deflections are in same directionD. (d) there are momentary galvanometer deflections that die out shortly, the deflections are in opposite directions
Answer» Correct Answer - D

52.	Which of the following properties of a proton can change while it moves freely in a mangetic field? (There may be more than one correct answer).A. (a) massB. (b) speedC. (c) velocityD. (d) momentum
Answer» Correct Answer - C::D Whenever a charnged particle (in this case a proton) moves in a mangetic field, its velocity and as a result of this its momentum change. Thus, (c) and (d) are the properties which change when a proton moves freely in a magnetic field.

53.	A uniform magnetic field exists in the plane of paper pointing from left to right as shown in figure. In the field, an electron and a proton move as shown. The electron and the proton experience: A. (a) forces both pointing into the plane of paperB. (b) forces both pointing out of the plane of paperC. (c) forces poiting into the plane of paper and out of the plane of paper, respectively.D. (d) forces pointing opposite and along the direction of the uniform magnetic field respectively
Answer» Correct Answer - A

54.	Choose the correct option: A rectangular coil of copper wires is rotated in a magnetic field. The direction of the induced current changes once in each:A. (a) two revolutionB. (b) one revolutionC. (c) half revolutionD. (d) one-fourth revolution
Answer» Correct Answer - C Option (c) is corret.

55.	What are the two main systems of wiring commonly used in household circuits? Which of the two is better and why?
Answer» (a) Tree system (b) Ring system. Ring system of wiring is better than the tree system due to the following resons: (a) Every appliance has its own fuse and as such in case of short-circuiting, only that particular appliance is disconnected from the circuit without affecting other appliances. (b) Since the length of wire is considerably small as a single ring feeds the entire house, the cost of wire is reduced. (d) It is easier to install and maintain.