21-30

Question 1

As of 2022, roughly what fraction of electricity in US was generated by natural gas?

Answer 1

40%

Question 2

Which country has the biggest natural gas reserve?

Answer 2

Russia

Question 3

Which country is a sole exporter (i.e. zero import) of natural gas?

Answer 3

Qatar

Question 4

Which country is a sole importer (i.e. zero export) of natural gas?

Answer 4

Japan

Question 5

From which of the following areas has biogas been extracted for commercial use

Answer 5

Landfills

Question 6

Atoms heavier than iron (56 26Fe), such as uranium-235 (235
92 U), tend to split into lighter atoms because

Answer 6

the electrostatic repulsion between protons and neutrons is stronger
than the Strong attraction among them.

Question 7

Atoms lighter than iron (56 26Fe), such as a hydrogen (1
1H) atom, tend to fuse with another hydrogen atom into a heavier atom because

Answer 7

the Strong attraction between protons and neutrons is stronger than
the electrostatic repulsion among the protons

Question 8

In both fusion and fission, the energy released from the reaction ultimately comes from

Answer 8

the loss in the total atomic mass

Question 9

What of the followings is a product of the fission of Uranium-235? Hint: Where was the Superman born?

Answer 9

Krypton

Question 10

The nuclear fission is a chain reaction because

Answer 10

the three neutrons produced during a fission trigger three new fissions, from which nine new neutrons are produced and further trigger nine fissions … this process multiplies indefinitely