The most extensive, commercially useful source of thorium as monazite sand occurs in India at

Indian monazite sand contains __________ percent thorium.

A

10

B

25

C

60

D

90

Which State of India has the largest reserves of monazite, with a high thorium content?

A

Kerala

B

Karnataka

C

Gujarat

D

Maharashtra

Main source of __________ is monazite sand.

A

Uranium

B

Polonium

C

Halfnium

D

Thorium

Uranium percentage in monazite sand is about

A

0.01

B

0.25

C

1.2

D

7

Which one of the following minerals is found in Monazite sand ?

A

Potassium

B

Uranium

C

Thorium

D

Sodium

Monazite deposits constitute an important source for the following metal.

A

Thorium

B

Titanium

C

Molybdenum

D

None of the above

Thorium Breeder Reactors are most suitable for India because

A

these develop more power

B

its technology is simple

C

abundance of thorium deposits are available in India

D

these can be easily designed

Thorium is mainly used

A

For the manufacture of gas mantles

B

As a fissile fuel in a nuclear reactor

C

In the manufacture of hydrogen bomb

D

In the treatment of cancer

Thoria is an expensive refractory material and is radioactive in nature. Thorium oxide is used in the manufacture of

A

Segar cones

B

Muffles for muffle furnaces

C

Insulating bricks

D

Crucibles used for melting of high purity metals

The main ore of thorium is

A

pitchblende

B

monazite

C

limonite

D

galena

The most extensive, commercially useful source of thorium as monazite sand occurs in India at

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