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The sex of a child is dertermined at the time of fertilisation of ovum by the chromosome inherited from father.

Genes are located in chromosomes.

There are 23 pairs of chromosomes in human cell.

Vent pipe is a vertical pipe attached to the drain line and runs through the roof of the home.
Soil pipe is a pipe that conveys sewage or waste from a toilet,etc. to a soil drain or sewer.
Anti-siphonage pipe is the pipe connected to the outlet of the toilet which is fixed to maintain the water seal to prevent the entry of gases in the toilet.

Galileo Galilei was an Italian astronomer, physicist and engineer, sometimes described as a polymath, from Pisa. Galileo has been called the “father of observational astronomy”, the “father of modern physics”, the “father of the scientific method”, and the “father of modern science”.

Silver is the best conductor of electricity because it contains a higher number of movable atoms (free electrons).
For a material to be a good conductor, the electricity passed through it must be able to move the electrons.
The more free electrons in a metal, the greater its conductivity.
Although silver is the best conductor, copper and gold are used more often in electrical applications because copper is less expensive and gold has a much higher corrosion resistance.

Chimpanzees display numerous signs of intelligence, from the ability to remember symbols to cooperation, tool use, and perhaps language. They are among species that have passed the mirror test, suggesting self-awareness. In one study, two young chimpanzees showed retention of mirror self-recognition after one year without access to mirrors. Chimps also display signs of culture among groups, with the learning and transmission of variations in grooming, tool use and foraging techniques leading to localised traditions.

When ice melts, it’s volume should increase but due to abnormal properties, it actually decreases. This happens up to 4 degree centigrade. The reason behind this is the cohesive forces. As temperature of water increases its cohesive forces gets stronger, so volume decreases.

During summer seasons, water kept in an earthen pot becomes cool because of the phenomenon of evaporation. Earthen pot has a large number of tiny pores in its walls and some of the water molecules continuously keep seeping through these pores to outside the pot. This water evaporates continuously and takes the latent heat required for vaporization from the remaining water. In this way, the remaining water loses heat and gets cooled.

Reverberation is the phenomenon of persistence of sound after it has been stopped as a result of multiple reflections from surfaces such as furniture, people, air etc. within a closed surface. These reflections build up with each reflection and decay gradually as they are absorbed by the surfaces of objects in the space enclosed.

A semiconductor diode is a p-n junction with metallic contacts provided at the ends for application of an external voltage.
It is a two terminal device.
Diode is a one junction semiconductor device which has one cathode and anode. The junction is of p-n type.

The model of a bridge rectifier is same as Wein Bridge.
It needs 4 resistors. Bridge rectifier needs 4 diodes while centre tap configuration requires only one.

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