HSSC TGT Science Exam

Electrolysis of NaCl produces Alkalinity.

NaOH have both Ionic & covalent bond.

A takes = 6 day

B B takes = 12 day

Total work (A and B LCM) = 12

Efficiency A = 1212=2\frac{12}{12} = 21212​=2

Efficiency B = 126=1\frac{12}{6} = 1612​=1

∴ Time by C = 122+1=4\frac{12}{2 + 1} = 42+112​=4 days

Efficiency C = 124=3\frac{12}{4} = 3412​=3

Time taken by B & C together

= Total workTotal efficiency=124=3\frac{\text{Total work}}{\text{Total efficiency}} = \frac{12}{4} = 3Total efficiencyTotal work​=412​=3 days

A copies 25 pages in 25 hrs.

∴ Efficiency of A = 7525=3\frac{75}{25} = 32575​=3

A + B together copy 135 pages in 27 hrs

∴ Efficiency = 13527=5\frac{135}{27} = 527135​=5

$$A+B-A=5-3=2$$

or, A + B = 5
B = 5 - A
B = 2 efficiency

B takes copying 42 pages

=422=21 hrs= \frac{42}{2} = 21 \text{ hrs}=242​=21 hrs

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