Practice Pakistan's most useful MCQs for competitive exams

Centrifugal forces are balanced in atom by__________________?

• (A)  Attractive forces
• (B)  Repulsive force
• (C)  Electrons
• (D)  Neutrons

Answer

Submitted By :Ali Uppal

_______________ can expel proteons from paraffins ?

• (A)  Electron
• (B)  Positron
• (C)  Neutron
• (D)  None of above has such capability

Answer

Submitted By :Ali Uppal

Quantum number which tells the energy of electron is________________?

• (A)  n
• (B)  1
• (C)  m
• (D)  s

Answer

Submitted By :Ali Uppal

Animal charcoal adsorbs the coloured_________________?

• (A)  impurities
• (B)  crystals
• (C)  solvents
• (D)  both A & B

Answer

Submitted By :Ali Uppal

Ratio of the amount of solute in organic and aqueous solvent is________________?

• (A)  Retardation factor
• (B)  Distribution co-efficient
• (C)  Distribution in aqueous solution
• (D)  All statements are wrong

Answer

Submitted By :Ali Uppal

95% ethanol is called_________________?

• (A)  methylated spirit
• (B)  wood spirit
• (C)  rectified spirit
• (D)  absolute alcohol

Answer

Submitted By :Ali Uppal

Which of the following technique is simple and efficient to purify a substance____________________?

• (A)  Filtration
• (B)  Sublimation
• (C)  Crystallization
• (D)  Solvent extraction

Answer

Submitted By :Ali Uppal

Separation of a solid from its hot saturated solution by cooling is called__________________?

• (A)  vapourization
• (B)  solvent extraction
• (C)  filtration
• (D)  crystallization

Answer

Submitted By :Ali Uppal

Sintered crucible is made up of________________?

• (A)  Plastic
• (B)  glass
• (C)  porcetain
• (D)  fiber

Answer

Submitted By :Ali Uppal

Gooch Crucibles are made up of________________?

• (A)  plastic
• (B)  fibre
• (C)  porcelain
• (D)  steel

Answer

Submitted By :Ali Uppal