Environmental Science and Engineering
2021 · Paper 1
Take it one question at a time. Try an answer, then check your understanding.
Complete GATE ES 2021 Paper 1 overview, original pages and practice · Timed previous-paper practice
Questions 34–36 of 65. Imported answers require review unless explicitly marked reviewed.
Question 24
Open questionESNAT1 markNeeds review
In a sample, the growth of microbial cells started with an initial concentration of 5×10⁴ cells per millilitre (mL) of the sample. After a certain time period, the cell concentration was found to be 1280×10⁴ cells per mL of the sample. Assuming binary fission of cells and no cell death, the number of generations of cell growth occurred in this time period is __________ (answer in integer).
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Open questionESNAT1 markNeeds review
A water jet discharging from a 4 cm diameter orifice has a diameter of 3.5 cm at its vena contracta. The coefficient of velocity is defined as the ratio of the actual velocity of the jet at vena contracta to the theoretical velocity of the jet. If the coefficient of velocity is 0.98, the coefficient of discharge for the orifice will be __________ (rounded off to two decimal places).
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Open questionESMCQ2 marksNeeds review
The 2×2 matrices P and Q satisfy the following relations:
and
The matrix Q is equal to __________.Your answerChoose one option.
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