Is it better to wire a house using a series circuit or a parallel circuit?
A a series circuit because if one circuit is broken, then the other circuits will still work
B a series circuit because if one circuit is broken, then the other circuits will not work
C a parallel circuit because if one circuit is broken, then the other circuits will still work
D a parallel circuit because if one circuit is broken, then the other circuits will not work

C a parallel circuit because if one circuit is broken, then the other circuits will still work

Explanation:

Electrical devices can be connected in two different configurations:

- Series configuration: in this configuration, all the devices are connected along the same branch of the circuit. This way, the current flowing through the devices is the same for all the devices. Also, the total resistance of the circuit is equal to the sum of the individual resistances:

- Parallel configuration: in this configuration, the devices are connected in different branches of the circuit. This way, the current flowing through them is different, however they have same potential difference across them. In this case, the total resistance of the circuit is given by

The main advantage of the parallel configuration compared to the series configuration is that in a parallel circuit, if one component is turned off/broken, the other components will continue working, since they are connected on separate branches. Instead, in a series circuit, when one component is turned off/broken, al the others also stop working, since they are along the same branch.

So the correct answer is

C a parallel circuit because if one circuit is broken, then the other circuits will still work

scattering of light by tiny particles in air to produce the colors we see on sky, is dependent on the following factors:

(i) wavelength of light

(ii) size of the scattering particle  

(iii) distance traveled by light through the atmosphere.

according to rayleigh's law of scattering, the amount of scattering is inversely proportional to the fourth power of its wavelength. shorter the wavelength, greater is its scattering. hence violet/blue light is scattered more than red.

sun's light is a composite light ( visible light) with wavelengths in the range 400 nm (violet) to 700 nm (red). as sunlight passes through our atmosphere, the molecules of air scatter light according to their wavelengths. during sunrise and sunset, the sun's position is below the horizon. hence light from the sun travels a greater distance in the atmosphere when compared to its position a noon.

as sunlight enters the earth's atmosphere, blue light is scattered away and at the end of its journey in the sky, only red and orange wavelengths remain in the beam.

hence at sunrise and sunset, the sky appears reddish orange.