Practice Pakistan's most useful MCQs for competitive exams

Nuclear reactors are provided with shield to guard against the emission of mainly _____________ rays?

• (A)  X
• (B)  α and β
• (C)  Neutrons & gamma
• (D)  Infrared

Answer

Submitted By :Ali Uppal

Which of the following is a moderating material used in nuclear reactor ?

• (A)  Graphite
• (B)  Cadmium
• (C)  Zircaloy (an alloy of zirconium and aluminium)
• (D)  Stainless steel

Answer

Submitted By :Ali Uppal

Uranium percentage in monazite sand is about________________?

• (A)  0.01
• (B)  0.25
• (C)  1.2
• (D)  7

Answer

Submitted By :Ali Uppal

The main ore of thorium is_________________?

• (A)  Pitchblende
• (B)  Monazite sand
• (C)  Limonite
• (D)  Galena

Answer

Submitted By :Ali Uppal

Fuel for a fast breeder reactor is_________________?

• (A)  Plutonium
• (B)  Uranium
• (C)  Radium
• (D)  Neptunium

Answer

Submitted By :Ali Uppal

Fast breeder reactors do not____________________?

• (A)  Use Th-232 as fissile fuel
• (B)  Convert fertile material to fissile material
• (C)  Use fast neutrons for fission
• (D)  Use molten sodium as coolant

Answer

Submitted By :Ali Uppal

Quantity of fissionable material (i.e. U-235) in natural uranium is _____________ percent?

• (A)  0.71
• (B)  6.31
• (C)  99.29
• (D)  12.73

Answer

Submitted By :Ali Uppal

Extraction of uranium from its ore is done using ______________ methods?

• (A)  Electrometallurgical
• (B)  Pyrometallurgical
• (C)  Chemical
• (D)  Physical beneficiation

Answer

Submitted By :Ali Uppal

The velocity of thermal (slow) neutrons triggering nuclear fission reaction (having energy equal to 0.025 eV) is about ______________ metres/second?

• (A)  1100
• (B)  2200
• (C)  3300
• (D)  4400

Answer

Submitted By :Ali Uppal

Which is the most commonly used molten metal for cooling of nuclear reactors ?

• (A)  Calcium
• (B)  Sodium
• (C)  Mercury
• (D)  Zinc

Answer

Submitted By :Ali Uppal