| 1 |
Choose the correct statement:
|
SO<sub>2</sub> affects the nucleus <br>
SO<sub>2</sub> affects plasmodesmate <br>
SO<sub>2</sub> affects cell wall <br>
SO<sub>2</sub> affects all membrane systems <br>
|
| 2 |
Which one of the pollutants of automobile exhausts affects the nervous system or produces mental diseases?
|
NO<sub>2</sub>
SO<sub>2</sub>
Hg <br>
Pb <br>
|
| 3 |
Which one of the following does not act as pollutant?
|
carbon monoxide <br>
sulphur dioxide <br>
hydrocarbons <br>
carbon dioxide <br>
|
| 4 |
Biochemical oxygen demand (BOD) is the capacity of organic matter in natural water to consume oxygen with in a period of:
|
2 days <br>
6 days<br>
5 days<br>
7 days <br>
|
| 5 |
The main pollution leather tanneries in the waste water is due to the salt of:
|
chromium <br>
copper <br>
calcium <br>
lead <br>
|
| 6 |
Potable water is considered to be:
|
safe for human consumption <br>
the ground water <br>
the Surface water <br>
now water is due to the salt of:<br>
|
| 7 |
A solid nitrate fertilizer reacts with an alkali to produce a gas which turns damp pH paper blue:
|
NO<sub>3</sub>
NHO<sub>3</sub>
NH<sub>2</sub>O
N<sub>2</sub>H<sub>4</sub>O<sub>3</sub>
|
| 8 |
The nitrogen present in some fertilizer helps plants:
|
to fight against diseases <br>
to produce fat <br>
to undergo photosynthesis <br>
to produce protein <br>
|
| 9 |
The fertilizer contains 33___35%n is:
|
ammonium nitrate <br>
potassium nitrate <br>
urea <br>
ammonia <br>
|
| 10 |
In Pakistan consumption per person is:
|
8kg <br>
5kg <br>
10kg <br>
6kg <br>
|
| 11 |
Hexamethylene reacts with _______ to prepare nylon 6,6
|
acetic acid <br>
adipic acid <br>
formic acid <br>
none of above <br>
|
| 12 |
Ketones are less reactive than aldehydes because:
|
alkyl groups electorn donation <br>
steric hindrance is greater in ketone <br>
both a and b <br>
ketones are non-polar <br>
|
| 13 |
When equal proportion of DH3_ l and C2H5 ___ l are treated with Na metal in preasence4 of dry ether, the number of possible hydrocarbons obtained will be:
|
5
4
3
2
|
| 14 |
The conversion of an halide of an alkene is an example:
|
addition reaction <br>
substitution reaction <br>
elimination reaction <br>
oxidation reaction<br>
|
| 15 |
The compound which does not form iodoform:
|
methyl alcohol <br>
ethyl alcohol <br>
acetone <br>
acetaldehyde<br>
|
| 16 |
Which of the following alkyl halides shows higher reactivity?
|
R __ F<br>
R __ CI <br>
R __ Br <br>
R __ I<br>
|
| 17 |
Which three element are needed for the health growth of plants:
|
S,S,P <br>
N,Ca,P
N,P,K <br>
N,K,C <br>
|
| 18 |
Natural fertilizers are materials derived form:
|
plants <br>
animals only <br>
both plant and animals <br>
none of all <br>
|
| 19 |
How many zones through which the charge passes in a rotary kiln?
|
4
3
2
5
|
| 20 |
The substance added to the soil to provide one or more nutrient elements which are necessary plant growth are known as:
|
Harmones <br>
minerals<br>
fertilizers <br>
none of above <br>
|
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