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141.

The surface tension of the nuclear fluid is

A.	more than that of water but less than that of mercury	B.	less than that of water
C.	much more than that of any liquid	D.	approximately equal to that of turpentine

142.

Energy in the sun is produced as a result of

A.	fission	B.	thermonuclear reaction
C.	explosion	D.	combustion

143.

Inside the sun

A.	four nuclei of hydrogen combine together to form one nucleus of helium	B.	four nuclei of hydrogen combine together to form two nuclei of helium
C.	four nuclei of hydrogen combine together to form four nuclei of helium	D.	one nucleus of hydrogen is transformed into one nucleus of helium.

144.

Hydrogen bomb is based on the nuclear fusion of

A.	hydrogen	B.	deuterium
C.	tritium	D.	helium

145.

The phenomenon of nuclear fission is used in the construction of

A.	the hydrogen bomb	B.	the atom bomb
C.	an ordinary bomb	D.	incendiary bomb

146.

The phenomenon of fusion is responsible for the energy radiated by

A.	the sun	B.	the atom bomb
C.	the firefly	D.	lightning

147.

In a nuclear explosion the energy is released in the form of

A.	electrical energy	B.	thermal energy
C.	kinetic energy	D.	potential energy

148.

The large energy released in atomic bomb explosion is due to

A.	release of neutrons	B.	conversion of heavy atoms to lighter atoms
C.	appreciable mass loss	D.	higher mass of products than initial substance

149.

Which metal is most important in atomic research?

A.	Cd	B.	U
C.	Pb	D.	Fe

150.

Laser is a device to produce

A.	a beam of white light	B.	a beam of coherent light
C.	microwaves	D.	gamma rays