Question

Answer the following question in one word. 1 x 5 = 5

(a) What are the species existing in small numbers called?

(b) How are the sounds of frequency greater than 20 KHZ called?

(c) Why do wrestlers rub soil on their hands?

(d) Which property of petroleum is used for separating it into various fractions?

(e) Identify the type of elements which are neither malleable nor ductile.

(f) Which zone of a candle flame is hottest?​

Answer 1

Answer:

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1.They are known as extinct species. Hope it will help you.

2.In water sound travels more than 4 times faster than in air. ... In the case of sound waves, frequency is between 20 Hz and 20,000 Hz. Acoustic waves of frequency smaller than 20 Hz are called infrasounds, and those of frequency greater than 20,000 Hz are called ultrasounds.

3.Wrestlers rub their hands with soil so that they get a better grip on the opponent. wrestlers use to rub some special substances and soil in their hand before entering into the ring to get grip on their opponent which make the fight much easier.

4.Crude oil is separated into fractions by fractional distillation. The fractions at the top of the fractionating column have lower boiling points than the fractions at the bottom. All of the fractions are processed further in other refining units.

5.Zinc, arsenic, antimony, mercury are few examples of metals which are neither malleable nor ductile.

6.Outermost nonluminous zone of complete combustion : This zone is faintly visible and surrounds the yellow luminous part of the flame. In this zone, the wax vapour undergoes complete combustion because plenty of air is present around it. This zone is the hottest part of the candle flame.

Answer 2

Answer:

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