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1251.

Flate plate collector is generally used for:

A.	Room heating	B.	Water heating
C.	Lighting	D.	All are correct

1252.

Of the following solar air heater is applicable in:

A.	Heating buildings	B.	Drying of agriculture products
C.	Air-conditioning of buildings	D.	All are correct

1253.

Wind energy is a form of:

A.	Solar energy	B.	Wave energy
C.	Biogas energy	D.	Ocean energy

1254.

The energy wind is converted into:

A.	Chemical energy	B.	Mechanical energy
C.	Electrical energy	D.	Biomass energy

1255.

In a windmill, tip speed ratio increases with:

A.	Increase of number of blades	B.	Decrease of number of blades
C.	Independent of blade number	D.	None of these

1256.

An instrument used to measure wind speed is:

A.	Dynamometer	B.	Anemometer
C.	Hygrometer	D.	Thermometer

1257.

Hot magma is a source of:

A.	Solar energy	B.	Wind energy
C.	Geothermal energy	D.	Tidal energy

1258.

Contour trenches are constructed:

A.	On contour of the land	B.	Not on the contour of the land
C.	Along the land slope	D.	All are correct

1259.

Heat flow in the ground is measured in bore holes to a depth of about:

A.	25 metres	B.	50 metres
C.	75 metres	D.	100 metres

1260.

One heat flow unit is equal to:

A.	10-6 cal/cm2/sec	B.	10-8 cal/cm2/sec
C.	10-9 cal/cm2/sec	D.	10-8 cal/cm2/sec