Practice Pakistan's most useful MCQs for competitive exams

In which of the following equilibria will Kc and Kp have the same value ?

• (A)  PCI5 = PCI3 + Cl2
• (B)  N2 + 3H2 = 2NH
• (C)  2CO + O2 = CO2
• (D)  N2 + O2 = 2NO

Answer

Submitted By :Ali Uppal

In the purification of portable water the coagulant used is_________________?

• (A)  alum
• (B)  nickel sulphate
• (C)  copper sulphate
• (D)  barium sulphate

Answer

Submitted By :Ali Uppal

Which statement is wrong ?

• (A)  the amount of ozone layer is greater in the region close to the equator
• (B)  ozone acts as filter for UV radiations
• (C)  in the equatorial region it acts as pollutant
• (D)  CFCs play effective role in removing O3 in the stratosphere

Answer

Submitted By :Ali Uppal

Which of the following air pollutants is more dangerous for ozone layer ?

• (A)  CFC
• (B)  CO2
• (C)  CO
• (D)  Oxides of nitrogen

Answer

Submitted By :Ali Uppal

In which of the following layer of atmosphere there is more thickness of ozone layer ?

• (A)  troposphere
• (B)  stratosphere
• (C)  mesosphere
• (D)  photosphere

Answer

Submitted By :Ali Uppal

Which of the following is not a condition for the formation of smog ?

• (A)  sufficient NO
• (B)  sunlight
• (C)  less movement of air
• (D)  winds

Answer

Submitted By :Ali Uppal

Acid present in acid rain may be__________________?

• (A)  H2SO4
• (B)  HNO3
• (C)  both A and B
• (D)  none

Answer

Submitted By :Ali Uppal

Hypochlorous acid is used for disinfecting the water it reacts with the dissolved ammonia producing___________________?

• (A)  NH2Cl
• (B)  NHCI2
• (C)  NCI2
• (D)  all of the above

Answer

Submitted By :Ali Uppal

Residence time of methane in the atmosphere is___________________?

• (A)  3 – 7 days
• (B)  2 -3 days
• (C)  3 – 7 years
• (D)  2 – 3 years

Answer

Submitted By :Ali Uppal

Three elements needed for the healthy growth of plants are_________________?

• (A)  N P K
• (B)  N K C
• (C)  N S P
• (D)  N Ca P

Answer

Submitted By :Ali Uppal