Question 2 : State TRUE or FALSE. Electric motors are used in electric fans, refrigerators, mixers, etc.

Question 3 : An electric kettle is rated as $2.5\ kW, \ 250\ V$. Find the cost running the kettle for two hours at $60\ \text{paisa}/\text{unit}$.

Question 4 : Which of the following quantities do not change when a resistor connected to a battery is heated due to the current?<br>

Question 5 : 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 8 : A geyser is rated 1500 W, 250 V. This geyser is connected to 250 V mains. The cost of energy consumed at Rs. 4.20 per kWh for 5 hours will be :<br/>

Question 9 : If the electric current in a lamp decreases by $5\ \%$,then the power output decreases by:<br>

Question 10 : A unit charge is rotated around a charge of q in a circular path at the distance of r. Then, work done will be:

Question 11 : The resistance of a wire is 10 ohm. The&#160;resistance of a wire whose length is twice and&#160;the radius is half, if it is made of same material&#160;is

Question 12 : Three heaters each rated 250 W, 100 V are connected in parallel to a 100 V supply.&#160;The energy supplied in kWh to the three heaters in 5 hours is :

Question 14 : 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/>