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difference (V), three students plotted the following graphs between (V) and (I) as per
their respective observations.

The observations, likely to be correct, are those of
(a) student I only.
(b) student II only.
(c) student III only,
(d) all the three students.

Question 15:
A student performs an experiment on studying the dependence of the current (7)
flowing through a conductor on the potential difference (V) applied across it by
setting up his circuit as shown. He records four values of T by keeping the sliding
contact J, in the positions K, L, M and N, one by one. The corresponding points on
his V-I graph are labelled as Pl; P2, P3 and P4. The point P3, would correspond to
the case when the sliding contact, J, is in the position

(a) K
(b) L
(c) M
(d) N

Short Answer Questions

Question 1:
In an experiment to study the relation between the potential difference across a
resistor and the current through it a student recorded the following observations.

On examining the above observations, the teacher asked the students to reject one
set of readings as the values were out of agreement with the rest. Which one of the
above sets of readings can be rejected? Calculate the mean value of resistance of
the resistor based on the remaining four sets of readings.