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Physics
A thin uniform wire AB of length 1m, an unknown resistance X and a resistance of 12 Ohm are connected by thick conducting strips, as shown in the below figure. A battery and a galvanometer (with a sliding jockey connected to it) are also available. Connections are to be made to measure the unknown resistance X using the principle of Wheatstone bridge. Answer the following questions. (a) Are there positive and negative terminals on the galvanometer? (b) Copy the figure in your answer book and show the battery and the galvanometer (with jockey) connected at appropriate points. (c) After appropriate connections are made, it is found that no deflection takes place in the galvanometer when the sliding jockey touches the wire at a distance of 60cm from A. Obtain the value of the resistance of X.
Chemistry
H₃BO₃ is: (a) Monobasic and weak Lewis acid (b) Monobasic and weak Bronsted acid (c) Monobasic and strong Lewis acid (d) Tribasic and weak Bronsted acid
Mathematics
In a triangle PQR, . If and are the roots of the equation ax² + bx + c = 0, , then (a) a + b = c (b) b + c = a (c) a + c = b (d) b = c