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

In domestic electric circuits the wiring with 15 A current rating is for the electric devices which have

1. higher power ratings such as geyser.
2. lower power ratings such as fan.
3. metallic bodies and low power ratings.
4. non-metallic bodies and low power ratings.

The statement that correctly describes the characteristic(s) of a gene is :

1. In individuals of a given species, a specific gene is located on a particular chromosome.
2. A gene is not the information source for making proteins in the cell.
3. Each chromosome has only one gene located all along its length.
4. All the inherited traits in human beings are not controlled by genes.

Select from the following the correct statement about tropic movement in plants:

1. It is due to stimulus of touch and temperature.
2. It does not depend upon the direction of stimulus received.
3. It is observed only in roots and not in stems.
4. It is a growth related movement.