JEE Main 2017 (Offline) | Current Electricity Question 325 | Physics

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:

4.005 × 10³ $$\Omega $$

1.985 × 10³ $$\Omega $$

2.535 × 10³ $$\Omega $$

2.045 × 10³ $$\Omega $$

JEE Main 2017 (Offline)

MCQ (Single Correct Answer)

-1

Which of the following statements is false?

Kirchhoff’s second law represents energy conservation.

Wheatstone bridge is the most sensitive when all the four resistances are of the same order of magnitude.

In a balanced wheatstone bridge if the cell and the galvanometer are exchanged, the null point is disturbed.

A rheostat can be used as a potential divider.

JEE Main 2017 (Offline)

MCQ (Single Correct Answer)

-1

JEE Main 2017 (Offline) Physics - Current Electricity Question 329 English

In the given circuit, the current in each resistance is:

0 A

1 A

0.25 A

0.5 A

JEE Main 2016 (Online) 10th April Morning Slot

MCQ (Single Correct Answer)

-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 :

400 $$\ln \,{{1.5} \over {1.3}}\,J$$

200 $$\ln \,{{2} \over {3}}\,J$$

60000 $$\ln \,{{6} \over {5}}\,J$$

300 J

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