Page 10 - HA

difference’: [Delhi 2009]
(A) Use copper wires as thin as possible for making connections.
(B) All the connections should be kept tight.
(C) The positive and negative terminals of the voltmeter and the ammeter should be
correctly connected.
(D) The ‘zero error’ in the ammeter and the voltmeter should be noted and taken into
consideration while recording the measurements.
(E) The ‘key’ in the circuit, once plugged in, should not be taken out till all the
observations have been completed.
The ‘precautions’ that need to be corrected and revised are
(a) (A), (C) and (E)
(b) (C) and (E)
(c) (B) and (E)
(d) (A) and (E)

Question 7:
A student draws the following circuit diagram
for the experiment on studying the dependence of current (/) on p.d. (V) across a
resistor. The parts labelled X, Y and Z, in this diagram are, respectively,

(а) a resistor, a voltmeter and a milliammeter
(b) a voltmeter, a resistor and a milliammeter
(c) a milliammeter, a resistor and a voltmeter
(d) a resistor, a milliammeter and a voltmeter

Question 8:
An ammeter has 20 divisions between mark 0 and mark 2 on its scale. The least
count of the ammeter is
(a) 0.02 A
(6) 0.01 A
(c) 0.2 A
(d) 0.1 A

Question 9:
In a voltmeter, there are 20 divisions between the 0 mark and 0.5 V mark. The least
count of the voltmeter is
(a) 0.020 V
(6) 0.025 V
(c) 0.050 V
(d) 0.250 V

Question 10:
The rest positions of the needles in a milliammeter and voltmeter when not being