33 Years NEET-AIPMT Chapterwise Solutions - Physics 2020

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22 NEET-AIPMT Chapterwise Topicwise Solutions Physics
66. Three resistances each of 4 W are connected to form a
triangle. The resistance between any two terminals is
(a) 12 W
(b) 2 W
(c) 6 W (d) 8/3 W (1993)
67. Current through 3 W resistor is 0.8 ampere, then
potential drop through 4 W resistor is
(a) 9.6 V
(b) 2.6 V
(c) 4.8 V (d) 1.2 V (1993)
68. In the network shown in figure each resistance is
1 W. The effective resistance between A and B is
Then the current drawn from battery becomes 10I.
The value of n is
(a) 10 (b) 11
(c) 20 (d) 9 (NEET 2018)
73. The internal resistance of a 2.1 V cell which gives a
current of 0.2 A through a resistance of 10 W is
(a) 0.8 W
(b) 1.0 W
(c) 0.2 W (d) 0.5 W (NEET 2013)
74. A cell having an emf e and internal resistance r is
connected across a variable external resistance R.
As the resistance R is increased, the plot of potential
difference V across R is given by
(a)
(b)
(c)
(d)
(a)
4
3 Ω (b) 3 2 Ω (c) 7 W (d) 8 7 Ω (1990)
69. You are given several identical resistances each
of value R = 10 W and each capable of carrying a
maximum current of one ampere. It is required to
make a suitable combination of these resistances
of 5 W which can carry a current of 4 ampere. The
minimum number of resistances of the type R that
will be required for this job is
(a) 4 (b) 10 (c) 8 (d) 20 (1990)
70. 40 electric bulbs are connected in series across a
220 V supply. After one bulb is fused the remaining
39 are connected again in series across the same
supply. The illumination will be
(a) more with 40 bulbs than with 39
(b) more with 39 bulbs than with 40
(c) equal in both the cases
(d) in the ratio 40 2 : 39 2 . (1989)
71. n equal resistors are first connected in series and
then connected in parallel. What is the ratio of the
maximum to the minimum resistance ?
(a) n (b) 1/n 2 (c) n 2 (d) 1/n (1989)
3.11 Cells, EMF, Internal Resistance
72. A set of n equal resistors, of value R each, are
connected in series to a battery of emf E and internal
resistance R. The current drawn is I. Now, the n
resistors are connected in parallel to the same battery.
(Mains 2012 )
75. A current of 2 A flows through a 2 W resistor
when connected across a battery. The same battery
supplies a current of 0.5 A when connected across a
9 W resistor. The internal resistance of the battery is
(a) 0.5 W
(b) 1/3 W
(c) 1/4 W (d) 1 W (2011)
76. A student measures the terminal potential difference
(V ) of a cell (of emf e and internal resistance r) as a
function of the current (I) flowing through it. The
slope, and intercept, of the graph between V and I,
then, respectively, equal
(a) –r and e (b) r and –e
(c) –e and r (d) e and –r (2009)
77. For a cell terminal potential difference is 2.2V when
circuit is open and reduces to 1.8 V when cell is
connected to a resistance of R = 5 W. Determine
internal resistance of cell (r).
(a) 10 9 Ω (b) 9
10 Ω
(c) 11
9 Ω (d) 5 9 Ω (2002)
78. A car battery of emf 12 V and internal resistance
5 × 10 –2 W, receives a current of 60 amp from
external source, then terminal potential difference
of battery is
(a) 12 V
(b) 9 V
(c) 15 V (d) 20 V (2000)