Question
In a fixed time, a boy swims thrice the distance along
the current that he swims against the current. If the speed of the current is 8 km/hr, the speed of the boy in still water isSolution
Let the rate of swimming in still water be x km/hr Rate down-stream = (x + 8) km/hr Rate up-stream = (x – 8) km/hr According to the question, (x + 8) t = 3 (x – 8) × t x + 8 = 3x – 24 x = 16 km/hr
What is dehydration?Â
Choose the wrong statement
The insecticide gammexane is chemically known as:
Name the source from which aspirin is produced?
The reaction of an aldehyde with Tollens’ reagent results in:
When cathode rays strike a target of high atomic weight, they give rise to:
What is the common characteristic of elements in the same group of the periodic table?
Magnesium oxide (MgO) + Water (H2O) = ?
Which gas is commonly used to artificially ripen green fruits?
Which of the following statement is/are true?
I. Atomic radius increases in moving from left to right along a period.
II. Atomic size...
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