# Category Questions

## A 100m long train is moving with a uniform velocity of 45km/h. What is the time taken by it to cross a bridge 1 km long?

A 100m long train is moving with a uniform velocity of 45km What is the time taken by it to cross a bridge 1 km long? Answer: The time taken by the train to cross the bridge : The distance covered by the…

## A ball is thrown vertically upwards with a velocity of 20ms−1 from the top of a multistorey building. The height of the point where the ball is thrown 25 m from the ground. How long will it be before the ball hits the ground ? Take g=10ms−2.

A ball is thrown vertically upwards with a velocity of 20ms−1 from the top of a multistorey building. The height of the point where the ball is thrown 25 m from the ground. How long will it be before the ball hits…

## What is the difference between percentage and percentile?

Difference between percentage and percentile The main distinction between percentage and percentile is that the former refers to a numerical number expressed as a percentage out of 100, while the latter refers to the percentage of values that fall below…

## The volume of 50 g of a substance is 20 cm3. If the density of water is 1 g/cm3, will the substance float or sink?

The volume of 50 g of a substance is 20 cm3. If the density of water is 1 g/cm3, will the substance float or sink? Answer: A substance floats on water if its density is less than the density of…