Question 1 :
If five equal pieces of $25\Omega$ are connected in parallel, then their equivalent resistance will be............
Question 3 :
The temperature of a conductor is increased. The product of resistivity and conductivity:<br/>
Question 4 :
You have the following appliances each of $500\ W$ running on  $220\ V$ a.c.: (1) Electric iron.(2) Electric lamp. (3) Electric room heater. The electric resistance is:
Question 6 :
Constantan wire is used for making standard resistance, because it has
Question 7 :
Two resistors of resistance $\displaystyle { R }_{ 1 }$ and$\displaystyle { R }_{ 2 }$ having$\displaystyle { R }_{ 1 }>{ R }_{ 2 }$ are connected in parallel. For equivalent resistance R, the correct statement is
Question 8 :
For a heater rated at4.4 kW; 220 V . Calculate the energy consumed by the heater in 4 hours?
Question 9 :
Identify the changes in a circuit on adding a light bulb in parallel to the actual resistance of the circuit. It will:<br/>
Question 10 :
An electric bulb of $60\ W$ is used for $6\ hrs/day$. Calculate the units of energy consumed in one day by the bulb.
Question 11 :
Mark the correctreason why tungsten is used for making filament of electric lamp.
Question 12 :
A typical thermistor can easily measure a change in temperature of the order of
Question 14 :
We have n resistors each of resistance R. The ratio of the combination for maximum and minimum values is
Question 15 :
Which of the following will produce maximum wastage of electricity ?
Question 16 :
Two resistors are connected a) in series b) in parallel.<br>The equivalent resistance in two cases are $9\ ohm$ and $2\ ohm$ respectively. Then the resistance of the component resistors are.
Question 17 :
Three resistors each having same resistance are connected in parallel. Their equivalent resistance is$\displaystyle 5\Omega$. If they are connected in series, their equivalent resistance is.
Question 19 :
A constant voltage is applied between the two ends of uniform metallic wire, some heat is developed in it. If both the length and the radius of the wire halved, the heat developed in the same duration will become
Question 22 :
When the electric resistance are connected in parallel, which one of the following quantities is not affected ?
Question 23 :
Which of the following equipment does not work on principle of Joule's law?
Question 24 :
A 24V potential difference is applied across a parallel combination of four 6 ohm resistor. The current in each resistor is:<br/>
Question 26 :
From below which are the applications of heating effect of electric current?<br>
Question 27 :
A current $i$ passes through a wire of length $L$, radius $R$ and resistively $\rho$. The rate of heat generated is
Question 28 :
Calculate the energy consumed by $2\ kW$ heater used for $1\ hr$ every day in a period of $30\ \text{days}$.
Question 29 :
An electric heater of resistance $6\ \Omega $ is run for $10\ min$ on a line of $120\ V$. The energy liberated in this period of time is:<br/>
Question 30 :
Mark the correctreason/s why nichrome is used for making heating element of electricalappliances.
