COMEDK 2025 Afternoon Shift | Current Electricity Question 7 | Physics

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:

$0.1 \Omega$ and 1.5 V

$6 \Omega$ and 10 V

$10 \Omega$ and 6 V

$10 \Omega$ and 15 V

COMEDK 2025 Afternoon Shift

MCQ (Single Correct Answer)

-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?

$5: 1$

$5: 36$

$5: 6$

$1: 5$

COMEDK 2025 Afternoon Shift

MCQ (Single Correct Answer)

-0

The resistance of the conductor is $\sqrt{3} \Omega$ the angle made by the V-I graph with the voltage axis is $\theta$

$\theta=60^{\circ}$

$\theta=30^{\circ}$

$\theta=15^0$

$\theta=45^{\circ}$

COMEDK 2025 Afternoon Shift

MCQ (Single Correct Answer)

-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.

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