Question 1 :
How much units of energy is consumed in operating ten 50 watt bulbs for 10 hours per day in a month (30 days)

Question 2 :
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 3 :
In a given themocouple, the temperature of cold junction is $20^oC$ while the temperature is $270^oC$. The temperature of inverson is

Question 4 :
What is the total resistance when four resistors of $20, 40, 60$, and $80$ respectively are connected in parallel (in ohm)?

Question 5 :
Mark the correctreason/s why nichrome is used for making heating element of electricalappliances.

Question 6 :
Shivam went for buying a CFL from D-mart, what safety mark he should look for?

Question 7 :
The resistance of a hot tungsten filament is about $10$ times the cold resistance. What will be the resistance of $100\ W,\ $ <br> $200\ V$ lamp when not in use?

Question 8 :
The neutral temperature of a thermocouple is 275$^oC$ and the temperature of inversion is 600$^oC$. The temperature of the cold junction is

Question 9 :
Two resistance thermometers are made, one of the platinum wire and the other of germanium wire. The resistance of both the thermometers are equal at room temperatures. Now the two resistance wires are connected to a battery. The two resistance wire are&#160;heated to 100$^0$C. The potential drop in the two resistance is measured. Which of the following statements is correct?&#160;

Question 10 :
The emf of the battery in a thermocouple is doubled. The rate of heat generation at one of the junctions will&#160;

Question 11 :
Calculate the monthly bill if a heater of 100 watt is used at the rate of rs. 1 per unit for 1 hour daily.

Question 12 :
The amount of work&#160;done in joules, when one unit electric charge moves from one point to another&#160;point in an electric circuit is called:&#160;

Question 13 :
The resistance of hot tungesten filament is about&#160;10 times the cold resistance. The resistance of&#160;100 W and 200 V lamp, when not in use is

Question 14 :
Calculate the amount of work done in moving a charged particle of charge $q$ through a potential difference of $V$.

Question 15 :
The lowest resistance which can be obtained by connecting $10$ resistors each of $1/10\ ohm$ is

Question 16 :
Which of these will consume most units of energy in a day?<br>

Question 17 :
A heater is marked 1000 W. The energy consumed by it in ten hours is

Question 18 :
Calculate the total power of 2 fans, if each of them draws a current of $5 A$ at a p.d of $200 V$.

Question 19 :
Assertion : Current is passed through a metallicwire, heating it red. When cold water is pouredon half of it, the rest becomes more hot.<br>Reason : Resistance decreases due to thedecreasein temperature and then current through wireincreases.<br>

Question 21 :
Two points P and Q are maintained at potentials of of $10V$ and $-4V$ respectively. The work done in moving $100$ electrons from P to Q is proportional to

Question 22 :
A material $\mathrm{B}$' has twice the specific resistance of $\mathrm{A}'$. A circular wire made of $\mathrm{B}$' has twice the diameter of a wire made of $\mathrm{A}'$. Then&#160;for the two wires to have the same resistance, the ratio $P_{\mathrm{A}}/P_{\mathrm{B}}$ of their respective lengths must be&#160;<br/>

Question 23 :
Find the electric field in the copper wire of area of cross section $2\ mm^2$ carrying a current of $1\ A.$ The resistivity of copper is $1.7\times 10^{-8}\Omega m$.<br>

Question 24 :
Two electric bulbs rated ${P}_{1}$ and watt at $V$ volt are connected in series across $V$ volt mains, then their total power consumption $P$ is

Question 25 :
The resistivity of the conductors is of the order of _______.