Question : There is a 4% increase in volume when a liquid freezes to its solid state. The percentage decrease when solid melts to liquid again is:
Option 1: $3\frac{3}{13}$%
Option 2: $4$%
Option 3: $4\frac{1}{13}$%
Option 4: $3\frac{11}{13}$%
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Correct Answer: $3\frac{11}{13}$%
Solution : Let the volume of liquid be 100. After freezing, it increases by 4% = 104 After melting, it decreases by = $\frac{4}{104} × 100$ = $3\frac{22}{26}$ = $3\frac{11}{13}$% Hence, the correct answer is $3\frac{11}{13}$%.
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Question : A mixture contains liquid A and B in the ratio 5 : 3, respectively. If 3 litres of liquid B is added to it, the ratio of liquid A to liquid B becomes 7 : 6. What is the quantity of liquid A in the mixture?
Option 1: $7 \frac{2}{3}$ litres
Option 2: $9 \frac{1}{3}$ litres
Option 3: $11 \frac{2}{3}$ litres
Option 4: $13 \frac{1}{3}$ litres
Question : If water is frozen to become ice, its volume is increased by 10%, then if the ice is melted to water again, its volume will be decreased by:
Option 1: $9$%
Option 2: $9\frac{1}{11}$%
Option 3: $8$%
Option 4: $9\frac{1}{2}$%
Question : When camphor is heated, which of the following changes will take place?
Option 1: Solid to gas
Option 2: Solid to liquid to gas
Option 3: Liquid to gas
Option 4: Solid to liquid
Question : On decreasing the price of a fan by 30%, its sales increase by 40%. What will be the percentage decrease in its revenue?
Option 1: 2% decrease
Option 2: 5% decrease
Option 3: 8% decrease
Option 4: 3% decrease
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