Hello Science

  Question 1. Kirchhoff s second law is based on the law of conservation of (a) charge (b) mass (c) energy (d) momentum Answer Answer: (c) energy Question 2. When there is an electric current through a conducting wire along its length, then an electric field must exist: (a) outside the wire but normal to it. (b) inside the wire but parallel to it. (c) inside the wire but normal to it. (d) outside the wire but around it. Answer Answer: (b) inside the wire but parallel to it. Question 3. The terminal potential difference of a cell when short circuited is (a) zero (b) E (c)  E 2 (d)  E 3 Answer Answer: (a) zero Question 4. A cell of e.m.f. ‘E’ and internal resistance r is connected in series with an external resistance nr. Then the ratio of the terminal potential difference to e.m.f. is (a)  1 n (b)  1 n + 1 (c)  n n + 1 (d)  n + 1 n Answer Answer: (c)  n n + 1 Question 5. For which of the following dependence of drift velocity electric field E is Ohm’s law obeyed. (a) v d  < √E (b) v