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Pollution in Ganga

The pH of a s...

Question

The pH of a sample of water collected from a river is found to be in the range of 3.5 to 4.5. The most likely reason for this is the waste being discharged into the river from a:
(a) soap and detergent manufacturing factory
(b) car battery manufacturing factory
(c) alcohol manufacturing factory
(d) plastic cups moulding factory

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Solution

(b) car battery manufacturing factory
Such factories produce acidic wastes that make the river water acidic.

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Q. Question 5
The pH of water sample collected from a river was found to be acidic in the range of 3.5 – 4.5, on the banks of the river were several factories that were discharging effluents into the river. The effluents of which one of the following factories is the most likely the cause for lowering the pH of river water:

(a) Soap and detergent factory
(b) Lead battery manufacturing factory
(c) Plastic cup manufacturing factory
(d) Alcohol distillery

Q. The pH of water sample collected from a river was found to be acidic in the range of

3.5 - 4.5

, on the banks of the river were several factories that were discharging effluents into the river. The effluents of which one of the following factories is the most likely cause for lowering the pH of river water?

Q. Six Mark Question:
Shreyskar runs a locks manufacturing factory. He wants to expand his business. For this, he wants to enter into the manufacturing of locks for cars as an ancillary company. By doing this his company will be able to provide many products to car manufacturers.
Which type of organisational structure will he choose for his factory and why? State any five advantages of this organisational structure.

Q. In a factory which manufactures bolts, machines A, B and C manufacture

30 %, 50 %

20 %

of the bolts respectively. Of their output

3 %, 4 %

1 %

respectively are defective bolts. A bolt is drawn at random from the product and is found to be defective. Find the probability that this is not manufactured by machine B.

Q. In a bolt factory, machines

A, B

C

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40 %

respectively of the total number of bolts. The percentage of defective bolts among the manufactured bolts is

5 %

A

4 %

B

2 %

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. A bolt is drawn randomly from the manufactured products and is found to be defective then,

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