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Why is petroleum called a fossil fuel?
Petroleum is called a fossil fuel as it is obtained from the bodies of dead organisms.
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- The fossil fuel P is formed under the earth by the decomposition of vegetable matter lying under water by the action of anaerobic bacteria. The major component of fuel P is Question The fossil fuel P is used as a source of gas R needed to manufacture nitrogenous fertilizers. When P is filled in metal cylinders and used as a fuel in motor vehicles, it is called S. What are P, Q, R and S?
- Name a fossil fuel other than coal and petroleum.
- Why is petroleum called black gold?
- If \( P A \) and \( P B \) are tangents from an outside point \( P \). such that \( P A=10 \mathrm{~cm} \) and \( \angle A P B=60^{\circ} \). Find the length of chord \( A B \).
- From a point \( P \), two tangents \( P A \) and \( P B \) are drawn to a circle with centre \( O \). If \( O P= \) diameter of the circle, show that \( \Delta A P B \) is equilateral.
- From an external point \( P \), tangents \( P A=P B \) are drawn to a circle with centre \( O \). If \( \angle P A B=50^{\circ} \), then find \( \angle A O B \).
- (a) What happens when carbon burns in air? Write the chemical equation of the reaction which takes place.(b) Why are coal and petroleum called fossil fuels? (c) Explain how coal was formed in the earth. (d) Describe how petroleum was formed in the earth. (e) Name a fossil fuel other than coal and petroleum.
- Two tangent segments \( P A \) and \( P B \) are drawn to a circle with centre \( O \) such that \( \angle A P B=120^{\circ} . \) Prove that \( O P=2 A P \).
- What is fossil fuel?
- Why is CNG called as clean fuel?
- Find the value of:(a) \( 4.9 \p 0.07 \)(b) \( 26.4 \p 2.4 \)
- Why are coal and petroleum known as fossil fuels?
- Draw a line segment \( A B=5.5 \mathrm{cm} \). Find a point \( P \) on it such that \( \overline{A P}=\frac{2}{3} \overline{P B} \).
- In \( \triangle A B C, \angle A \) is obtuse, \( P B \perp A C, \) and \( Q C \perp A B \). Prove that \( A B \times A Q=A C \times A P \).
- The fossil fuel whose known reserves in the earth are expected to last for the minimum period is:(a) coal (b) uranium (c) petroleum (d) natural gas
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