COMEDK 2025 Evening Shift | Current Electricity Question 5 | Physics

The resistance of a heating element is found to be $120 \Omega$ at room temperature which is $20^{\circ} \mathrm{C}$. If the temperature coefficient of the material of the resistor is $1.6 \times 10^{-4} C^{-1}$ and the resistance is found to be $160 \Omega$, the temperature of the element is:

$1203^{\circ} \mathrm{C}$

$2083^{\circ} \mathrm{C}$

$2310^{\circ} \mathrm{C}$

$2013^{\circ} \mathrm{C}$

COMEDK 2025 Afternoon Shift

MCQ (Single Correct Answer)

-0

The wire made of Phosphor bronze is used as the suspension strip in the moving coil galvanometer, because:

Its restoring torque per unit twist is very large

It is more flexible

It has less tensile strength

Its restoring torque per unit twist is small.

COMEDK 2025 Afternoon Shift

MCQ (Single Correct Answer)

-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:

$0.1 \Omega$ 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?

$5: 1$

$5: 36$

$5: 6$

$1: 5$

PREVIOUS NEXT

COMEDK Subjects