The mixture of flammable gases (carbon monoxide and hydrogen) and nonflammable gases (nitrogen and carbon dioxide) is called by what name?

• Laser Star Gas
• Breathing Gas
• Producer Gas
• Laughing Gas
Correct Option: C  [ Producer Gas ]

Remark:

A piece of ice is ?oating in a beaker containing water. When whole of the ice melts:

• the level of water will come down.
• the level of water will come up.
• the level of water will first rise and then fall.
• the level of water will remain the same.
Correct Option: D  [ the level of water will remain the same. ]

Remark:

"ELISA" test is employed to diagnose:

• Polio Virus
• AIDS antibodies
• Tuberculosis
• Cancer
Correct Option: B  [ AIDS antibodies ]

Remark: The assay used most widely to detect or diagnose virus infection, especially infection of blood borne viruses e.g. HBV, HCV, HIV and HTLV, is the enzyme linked immunosorbent assay (ELISA).

Purity of milk is tested by:

• Electrometer
• Lactometer
• Radiometer
• Refractometer
Correct Option: B  [ Lactometer ]

Remark:

A vitamin requires cobalt for its activity. The vitamin is:

• Vitamin B₁₂
• vitamin D
• vitamin B₂
• Vitamin A
Correct Option: A  [ Vitamin B₁₂ ]

Remark:

Through the fused sodium chloride, electric current can pass out due to the presence of:

• Free electron
• Free ion
• Free molecule
• None of these
Correct Option: B  [ Free ion ]

Remark:

Which of the following allow the electric current to pass through it ?

• Glasses
• Graphite
• Rubber
• PVC
Correct Option: B  [ Graphite ]

Remark:

Angle of friction and angle of repose are:

• equal to each other
• not equal to each other
• proportion to each other
• none of the above
Correct Option: A  [ equal to each other ]

Remark:

Seismology is the science of :

• Atmosphere
• Earthquake
• Fossil
• Silkworm breeding
Correct Option: B  [ Earthquake ]

Remark:

The weight of a body at the centre of the earth is:

• zero
• infinite
• same as at other places
• none of these
Correct Option: A  [ zero ]

Remark: