1
JEE Main 2017 (Offline)
+4
-1
Which of the following statements is false?
A
Kirchhoff’s second law represents energy conservation.
B
Wheatstone bridge is the most sensitive when all the four resistances are of the same order of magnitude.
C
In a balanced wheatstone bridge if the cell and the galvanometer are exchanged, the null point is disturbed.
D
A rheostat can be used as a potential divider.
2
JEE Main 2017 (Offline)
+4
-1

In the given circuit, the current in each resistance is:
A
0 A
B
1 A
C
0.25 A
D
0.5 A
3
JEE Main 2017 (Offline)
+4
-1
When a current of 5 mA is passed through a galvanometer having a coil of resistance 15$$\Omega$$, it shows full scale deflection. The value of the resistance to be put in series with the galvanometer to convert it into a voltmeter of range 0 – 10V is:
A
4.005 × 103 $$\Omega$$
B
1.985 × 103 $$\Omega$$
C
2.535 × 103 $$\Omega$$
D
2.045 × 103 $$\Omega$$
4
JEE Main 2016 (Online) 10th April Morning Slot
+4
-1
The resistance of an electrical toaster has a temperature dependence given by R(T) = R0 [1 + $$\alpha$$(T − T0)] in its range of operation. At T0 = 300 K, R = 100 $$\Omega$$ and at T = 500 K, R = 120 $$\Omega$$. The toaster is connected to a voltage source at 200 V and its temperature is raised at a constant rate from 300 to 500 K in 30 s. The total work done in raising the temperature is :
A
400 $$\ln \,{{1.5} \over {1.3}}\,J$$
B
200 $$\ln \,{{2} \over {3}}\,J$$
C
60000 $$\ln \,{{6} \over {5}}\,J$$
D
300 J
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