The efficiency of the solar cooker can be increased by using ___with it.
an absorber
a refractor
a reflector
an insulator
The energy produced inside the Sun is due to
electron transition
fission
Fusion
none of these
The constituents contained in petroleum are separated by subjecting to a process called
Batch distillation
Steam distillation
Fractional distillation
Extractive distillation
Coal is a _________ source of energy.
non renewable
renewable
atomic
thermal
The minimum speed of wind necessary for the satisfactory working of a wind generator to produce electricity is about :
15 km/h
25 km/h
35 km/h
45 km/h
Fill the blanks by LPG : Butane, CNG :
ethane
methane
propane
____are devices which work on wind.
windmills
solar panel
nuclear power plant
The main constituent present in LPG(cooking gas) is
butane
benzene
Find the odd one which doesn't come into the group
Coal
Petroleum
Biogas
Natural gas
