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1271.

Solar energy can be directly converted into electrical energy, by a method is:

A.	Thermoelectric	B.	Thermionic
C.	Magneto hydrodynamic	D.	All are correct

1272.

Shoulder bounds are provided to:

A.	Retain the runoff over benches	B.	Provide stability to the outer edge of bench
C.	Both (a) & (b)	D.	None of these

1273.

The first nuclear power station came into operation (1957) at:

A.	IEA	B.	England
C.	Germany	D.	China

1274.

In biogas plant digestion (biological process) occurs in absence of:

A.	Oxygen	B.	Carbon dioxide
C.	Hydrogen	D.	Methane

1275.

Biogas is a mixture of:

A.	Methane and carbon dioxide	B.	Ethane and carbon dioxide
C.	Ethane and methane	D.	Ethane and carbon mono oxide

1276.

The methane bacteria work best at a temperature range of:

A.	30-32?C	B.	35-38?C
C.	40-45?C	D.	48-52?C

1277.

A biogas production starts falling at an atmospheric temperature of:

A.	15?C	B.	20?C
C.	25?C	D.	30?C

1278.

The biogas production stops at an atmospheric temperature of:

A.	5?C	B.	10?C
C.	14?C	D.	18?C

1279.

When the temperature is raised to 38.3?C the gas production increased by:

A.	25%	B.	40%
C.	50%	D.	75%

1280.

The optimum C:N ratio for maximum microbiological activities is:

A.	10;1	B.	15;1
C.	25;1	D.	30;1