Which of the following mirror/s is/are used to focus the sunlight to a single point and produce a lot of thermal energy?
a) plane
b) concave
c) convex
d) all of these
Which of the following energy is/are used in solar cooker to cook food?
a) wind energy
b) sunlight energy
c) fuel energy
d) all of these
Which of the following is environment friendly and cheap cooker?
a) solar cooker
b) electric cooker
c) gas cooker
d) fuel cooker
Which of the following mirror/s is/are NOT used to focus the sunlight to a single point and produce a lot of thermal energy?
a) plane
b) flat
c) convex
d) all of these
Designing a Wind Turbine:
A wind turbine is a device that converts the kinetic energy of wind into electrical energy. Hundreds of thousands of large turbines, in installations known as wind farms, now generate over 650 gigawatts of power, with 60 GW added each year.
Wind can move
things around because it carries
a) heat
b) light
c) energy
d) all of these
