If four identical resistors, of resistance 8 ohm, are first connected in series so as to give an effective resistance R_s, and then connected in parallel so as to give an effective resistance R_p then the ratio $\dfrac{R$s}{Rp} is

1. 32
2. 2
3. 0.5
4. 16

The resultant magnetic field at point 'P' situated midway between two parallel wires (placed horizontally) each carrying a steady current I is

1. in the same direction as the current in the wires.
2. in the vertically upward direction.
3. zero
4. in the vertically downward direction.

Select the INCORRECT match (between the plant and its vegetative part) from the following :

1. Bryophyllum, leaf
2. Potato, stem
3. Money-plant, stem
4. Rose, root

In the following diagram, the position of the needle is shown on the scale of a voltmeter. The least count of the voltmeter and the reading shown by it respectively are :

1. 0.15 V and 1.6 V
2. 0.05 V and 1.6 V
3. 0.15 V and 1.8 V
4. 0.05 V and 1.8 V