Question 1 :
In a given themocouple, the temperature of cold junction is $20^oC$ while the temperature is $270^oC$. The temperature of inverson is
Question 2 :
Calculate the energy consumed by $2\ kW$ heater used for $1\ hr$ every day in a period of $30\ \text{days}$.
Question 3 :
For a heater rated at4.4 kW; 220 V . Calculate the energy consumed by the heater in 4 hours?
Question 4 :
The temperature of a conductor is increased. The product of resistivity and conductivity:<br/>
Question 6 :
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 7 :
A piece of copper and another of germanium are cooled from room temperature to 80K. The resistance of
Question 10 :
Which of the following quantities do not change when a resistor connected to a battery is heated due to the current?<br>
Question 11 :
The smallest resistance that can be obtained by combining 10 resistors each of resistance $10 \Omega$is
Question 12 :
Constantan wire is used for making standard resistance, because it has
Question 13 :
An electric lamp is marked $60\ W,\ 220\ V$. The cost of kilo watt hour of electricity is $Rs.\ 1.25$. The cost of using thing lamp on $220\ V$ for $8\ hrs$ is:
Question 14 :
The current in a wire is doubled keeping temperature constant. Which of the following statements is/are wrong?
Question 15 :
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 16 :
An electric fuse used in households works on which principle of:<br/>
Question 18 :
How much units of energy is consumed in operating ten 50 watt bulbs for 10 hours per day in a month (30 days)
Question 19 :
As the temperature of a conductor increases, its resistivity and conductivity change. The ratio of resistivity to conductivity<br>
Question 20 :
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 21 :
Shivam went for buying a CFL from D-mart, what safety mark he should look for?
Question 22 :
A current $i$ passes through a wire of length $L$, radius $R$ and resistively $\rho$. The rate of heat generated is
Question 23 :
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 24 :
If five equal pieces of $25\Omega$ are connected in parallel, then their equivalent resistance will be............
Question 25 :
Why are bulbs filled with chemically inactive Nitrogen or Argon gas?<br>
Question 26 :
A particle with acharge of 3 coulombs is taken from a point at a potential of 50 V to anotherpoint at a potential of 120 V. Calculate the work done.
Question 27 :
On moving a charge of 20 coulombs by 2 cm, 2 J of work is done, then the potential difference between the points is:
Question 28 :
The power rating of an electric motor that draws a current of $3.75\ A$, when operated at $200\ V$, is nearly
Question 29 :
Masses of three wires of the same metal are inthe ratio $1:2 :3$ and their lengths in the ratio $3:2:1$.Electrical resistances of these wires will be inthe ratio<br><br>
Question 30 :
Two wires are as follows. The resistivities, lengths and radii are in the ratio $2:3$, $3:5$ and $2:7$ respectively. Their resistancesare in the ratio of<br>
Question 31 :
An infinite sheet carrying a uniform surface charge density $\sigma$ lies on the xy-plane. The work done to carry a charge q from the point $\overrightarrow{A} = a(\hat{i}+2j+3\hat{k})$ to point $\overrightarrow{B} = a(\hat{i}-2\hat{j}+6\hat{k})$ (where a is constant with the dimension of length and ${\varepsilon}_0$ is the permittivity of free space) is :
Question 32 :
The work done in carrying a charge $Q$ once around a circle of radius $r$ about a charge $q$ at the centre is
Question 33 :
Two wires of resistance $R_1$ and $R_2$ are joined in parallel. The equivalent resistance of the combination is:<br/>
Question 34 :
The energy consumed in 1 kilowatt electric heater in 30 seconds will be
Question 35 :
Two wires have their lengths in the ratio $1 : 3$ diameters in the ratio $2 : 3$ and their materials have specific resistances in the ratio $2 : 1$. Then the ratio of their resistances is :<br/>
Question 36 :
The two charges $7\mu C\,{\text{and}}\, - 2\mu C$ are separated by a distance of 18 cm. The work required by you to separate the two charges infinitely away from each other is:
Question 37 :
How much energy in kilowatt hour is consumed in operating ten 50 watt bulbs for 10 hours per day in a month (30 days)
Question 38 :
A motor of $50\ W$ runs for $20\ hrs$. How many 'units' ($kWh$) of electrical energy are consumed?
Question 39 :
$4$ bulbs rated $100$W each, operate for $6$ hours per day. What is the cost of the energy consumed in $30$ days at the rate of Rs. $5$/kWh?
Question 40 :
 Calculate the work done to move to $10\ \mu c$ charge from a point at a potential of $10$ V to a point which is at a potential of $90$ V is:
