Q1: The width of a weir with end contraction, is

ANS:B - less than the width of the channel

The width of a weir with end contraction typically refers to the effective width of the weir opening, which is less than the actual width of the channel. When weirs have end contractions, the flow of water is focused and directed towards the weir opening, causing the effective width of the flow to be less than the width of the channel. This narrowing of the flow helps to concentrate the flow rate and facilitate more accurate measurement of the flow over the weir. Therefore, the correct option is: less than the width of the channel