Question 1 :
A thermocouple is made from copper and iron. at the hot junction, the current

Question 2 :
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 4 :
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 heated to 100$^0$C. The potential drop in the two resistance is measured. Which of the following statements is correct? 

Question 5 :
A typical thermistor can easily measure a change in temperature of the order of

Question 6 :
What is the minimum resistance that one can obtain by connecting all the five resistances each of $0.5\Omega$?

Question 7 :
The potential at a point in an electric field is $ 200 \mathrm{V} $, then the work done in bringing an electron to that point is

Question 8 :
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 9 :
Heater of an electric kettle is made of a wire of length L and diameter d. It takes 4 minutes to raise the temperature of 0.5 kg water by 40 K. This heater is replaced by a new heater having two wires of the same material, each of length L and diameter 2d. The way these wires are connected is given in the options. How much time in minutes will it take to raise the temperature of the same amount of water by 40 K?