The advantage(s) of an economiser is/are

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The advantage(s) of an economiser is/are

Ait increases the efficiency of the boiler plant

Bit reduces the range of temperature between different parts of the boiler

Cit makes for more rapid evaporation

DAll of these

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A four stroke cycle petrol engine requires for strokes of the piston to complete

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A four stroke cycle petrol engine requires for strokes of the piston to complete

Aone cycle of operation

Btwo cycles of operation

Cfour cycles of operation

Deight cycles of operation

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The amount of heat generated/kg is known as

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The amount of heat generated/kg is known as

Aheat energy

Bcalorific value

Clower calorific value

Dhigher calorific value

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The temperature at which the volume of a gas becomes zero is called

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The temperature at which the volume of a gas becomes zero is called

Aabsolute temperature

Babsolute zero temperature

Cabsolute scale of temperature

DNone of these

roshan ? Jan 11 '2020 at 21:50

Correct answer is: absolute zero temperature

Explanation:

The temperature at which the volume of an ideal gas becomes zero; a theoretical coldest temperature that can be approached but never reached. Absolute zero iszero on the Kelvin scale, -273.15°C on the Celsius scale, and -459.67°F on the Fahrenheit scale

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For the reversibility of a cycle, there should be

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For the reversibility of a cycle, there should be

Aloss of energy

Bno loss of energy

Cgain of energy

Dno gain of energy

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Why is ozone layer important to mankind?

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Why is ozone layer important to mankind?

AIt creates a protective covering against ultraviolet rays

BIt remains the temperature of earth

CIt release oxygen in the atmosphere

DIt release Corban Dioxide in the atmosphere

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Which gas is evolved during photosynthesis in plants?

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Which gas is evolved during photosynthesis in plants?

ACarbon dioxide

BOxygen

CNitrogen

DHidrogen

rahul ? Jan 11 '2020 at 18:53

Correct answer is: Oxygen

Explanation:

The chemical equation for photosynthesis is:

\(6CO_2{(g)}+6H_2O{(l)}\overset{\text{sunlight}}{\xrightarrow{\text{chlorophyll}}}C_6H_{12}O_6{(aq)}+6CO_2{(g)}\)

So from here, we see that carbon dioxide and water are used, in the presence of light and chlorophyll, so that eliminates options B) and C).

A) is a correct answer because oxygen gas is present on the reactants side of the equation.

But wait, there's more! Glucose is eventually converted into pyruvic acid, and then adenosine triphosphate (ATP), which is the main energy carrier in all cells, so technically

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