Answer to Question #51844 in Physics for Samuel

Question

13 In an experiment, potential difference is plotted on the ordinate (vertical axis) and current on the abscissa(horizontal axis). The slope of the graph represents (a) potential difference b)bcurrent remains constant c) resistance d) resistivity
16 A ray incident on a glass prism undergoes minimum deviation when the (a) incident angle is equal to the angle of refraction (b) refraction angle equals 90o (c) incident angle equals 90o (d) incident angle is equal to the angle of emergency
17 The advantage of potentiometer over voltmetr in measurements of emf is that (a) the potentiometer wire is assumed to be uniform (b) it does not draw current from the circuit under test (c) the temperatue of the wire must remain constant (d) faults may arise due to breaks or wrong connections in the circuit
19 Which of the following is NOT true about a rheostat? (a) It is a constant current instrument
(b) It is a resistor with moving contact (c) It is used for varying the current in a circuit (d) It is used for vary