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Objective Questions:

1. Joining of lighter nuclei to make a heavier nucleus, most commonly hydrogen
2
2
isotopes to helium such as H + H
a. Nuclear Fusion, which is also the source of energy in the Sun and other stars.
b. Nuclear Fission

c. Isotopes
d. Isobars

2. The process by which energy is produced in the sun is

(a) Nuclear fission

(b) Nuclear fusion

(c) Both nuclear fusion and fission

(d) Combustion of hydrogen

3. Ocean-Thermal-energy conversion plants operate if

a. Water on the surface of oceans is cold
b. Temperature difference between the water at surface and water at depths up to 2
o
km is at least 293 K or 20 C
c. Temperature difference between the water at surface and water at depths up to 2
0
km is around 10 C
d. It is independent of temperature difference between the water at surface and
water at depths

4. The tidal waves in oceans build up and recede
a. once a day.

b. twice a day.

c. thrice a day.
d. four times in a day.

5. The level of water in the sea rises and falls mainly due to the gravitational pull of the

a. moon.
b. earth.

c. universe.

d. planets.