A current passes through a wire of variable cross-section in steady-state as shown. Then incorrect statement is:

    

1.	Current density increases in the direction of the current.
2.	Potential increases in the direction of the current.
3.	Electric field increases in the direction of the current.
4.	Drift speed increases in the direction of the current.

The value of E (emf of the cell) in the circuit given below is:
  

Two cells of e.m.f. E and internal resistance r₁ and r₂ are connected in series through an external resistance R. The value of R for which the potential difference across one of the cells becomes zero will be:

1.  $\frac{{\mathrm{r}}_1{\mathrm{r}}_2}{{\mathrm{r}}_1 + {\mathrm{r}}_2}$ 

2.  ${\mathrm{r}}_1+{\mathrm{r}}_2$

3.  $\left|{\mathrm{r}}_2 - {\mathrm{r}}_1\right|$

4.  $\frac{{\mathrm{r}}_1}{{\mathrm{r}}_2}$

In the given circuit diagram, 3 identical bulbs are connected. If bulb B₃ get fused suddenly, how will the brightness of bulbs B₁ and B₂ change?
              

What is the reading of the voltmeter of resistance 1200 $\Omega$ connected in the following circuit diagram? 

1. 2.5 V

2. 5.0 V

3. 7.5 V

4. 40 V

The dependence of resistivity \((\rho)\) on the temperature \((T)\) of a semiconductor is, roughly, represented by:

1.		2.
3.		4.

Current through the \(2~\Omega\)$$ resistance in the electrical network shown is:

Two batteries, one of emf 18V and internal resistance 2 $\mathrm{\Omega }$ and the other of emf 12 V and internal resistance 1 $\mathrm{\Omega ,}$ are connected as shown. Reading of the voltmeter is:
(if voltmeter is ideal)

1.  14 V

2.  15 V

3.  18 V

4.  30 V

A current of 2 A is to be sent through a resistor of \(5 ~\Omega.\) Number of cells required in series, if each has emf 2 V and internal resistance 0.5 $\mathrm{\Omega }$, are:
1. 40
2. 30
3. 20
4. 10

A 50 kW dc generator produces a potential difference of 250 V. If the resistance of the transmission line is 1 $\Omega$, what percentage of the original power is lost during transmission?

1.  80%

2.  40%

3.  20%

4.  10%