1
COMEDK 2025 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0
Ten cells, each having internal resistance $1 \Omega$ and emf 1.5 V are connected in series. But unknowingly 3 cells are connected wrongly in series. The effective internal resistance and emf of the series combination are respectively:
A
$0.1 \Omega$ and 1.5 V
B
$6 \Omega$ and 10 V
C
$10 \Omega$ and 6 V
D
$10 \Omega$ and 15 V
2
COMEDK 2025 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0
A galvanometer of $50 \Omega$ resistance is converted into an ammeter using a shunt resistance of $10 \Omega$. If the same resistance is used to convert the same galvanometer in to a voltmeter, what would be the ratio of the resistance of the ammeter to the resistance of the voltmeter?
A
$5: 1$
B
$5: 36$
C
$5: 6$
D
$1: 5$
3
COMEDK 2025 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0
The resistance of the conductor is $\sqrt{3} \Omega$ the angle made by the V-I graph with the voltage axis is $\theta$
A
$\theta=60^{\circ}$
B
$\theta=30^{\circ}$
C
$\theta=15^0$
D
$\theta=45^{\circ}$
4
COMEDK 2025 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0
Across the 220 V source of internal resistance $20 \Omega$, how many lamps of $40 \mathrm{~W}, 100 \mathrm{~V}$ can be connected in parallel so that all the lamps may glow with full brightness.
A
40
B
15
C
30
D
20
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