Question: Pick out the wrong statement?

• 1. Close circuit grinding is more economical than open circuit grinding
• 2. Cod oil, beef tallow or aluminium stearates are used as grinding aids in cement ‘industries’
• 3. The equipment used for the removal of traces of solids from a liquid is called a classifier
• 4. Size enlargement is a mechanical operation exemplified by medicinal tablet making

Question: Pick out the wrong statement ?

• 1. Magnetic separation method can be employed to treat both dry & wet ores
• 2. Reduction ratio in crushing operation is defined as the ratio of minimum feed size to themaximum product size
• 3. Gyratory crusher is used for coarse crushing
• 4. Screens are of stationary, moving and vibratory types

Question: Artificially produced radioactive isotopes are used for____________________?

• 1. Power generation
• 2. Treatment of certain diseases
• 3. Initiating nuclear fission and fusion
• 4. All A, B & C

Question: Research reactors are normally meant for_____________________?

• 1. Producing high neutron flux 1012-1013 neutrons/cm2, sec and studying the effect of neutronbombardment on different materials
• 2. Accelerating the neutrons
• 3. Power generation
• 4. None of these

Question: Main source of ______________ is monazite sand?

• 1. Uranium
• 2. Polonium
• 3. Hafnium
• 4. Thorium

Question: Both tritium and deuterium have the same number of_______________?

• 1. Neutrons
• 2. Electrons
• 3. Protons
• 4. Nucleons

Question: A fast breeder reactor employs___________________?

• 1. Graphite as moderator
• 2. Water as coolant
• 3. Molten sodium as coolant as well as moderator
• 4. U-235 as fuel

Question: Which of the following is the most harmful for the human being ?

• 1. β-rays
• 2. X-rays
• 3. γ-rays
• 4. Ultra violet rays

Question: Energy equivalent to one atomic mass unit (amu) is ______________ MeV?

• 1. 9.31
• 2. 93.1
• 3. 931
• 4. 9310

Question: The critical mass of a fissionable material can be reduced by__________________?

• 1. Heating it
• 2. Cooling it
• 3. Surrounding it by neutron reflecting material
• 4. Surrounding it by neutron absorbing material