Life Sciences
GATE XL topic:biological-sciences PYQs
Build your understanding with focused practice from past exam papers.
Questions 261–270 of 1235. Imported answers require independent review unless marked reviewed.
Question 17
Open questionXL-PNAT1 markNeeds review
The maximum number of electrons that can be accommodated in the shell with n = 2 is ______ (in integer).
(Given: n = principal quantum number)
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Open questionXL-PNAT1 markNeeds review
One mole of an ideal gas expands isothermally and reversibly to double its volume. If the expansion work done by the system is 1728.85 J, the temperature of the system is _____ K (rounded off to 2 decimal places).
(Given: Gas constant, R = 8.314 J K⁻¹ mol⁻¹)
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Open questionXL-PNAT1 markNeeds review
The initial rate of a reaction triples when the concentration of a reactant, A, is doubled. The order of the reaction with respect to A is ______ (rounded off to 2 decimal places).
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Open questionXL-PMCQ2 marksNeeds review
Each of the following alkenes undergoes addition reaction with bromine. Under the same reaction conditions, the CORRECT trend in the reaction rates is
Structures I, II and III are shown.
Your answerChoose one option.
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Open questionXL-PMCQ2 marksNeeds review
An enzyme-catalyzed conversion of a substrate at 298 K proceeds by a Michaelis-Menten mechanism. The Lineweaver-Burk plot for the analysis of the experimental data has an intercept along the y-axis of 0.357 mol⁻¹ dm³ s and a slope of 2.10 s. The CORRECT Michaelis constant for the reaction is ______ (rounded off to 2 decimal places).
Your answerChoose one option.
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Open questionXL-PMCQ2 marksNeeds review
Which one among the following structures is the most stable conformer of (Z)-pent-2-ene?
Your answerChoose one option.
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Open questionXL-PMSQ2 marksNeeds review
Upon addition of compound X to an aqueous AgNO₃ solution, a white precipitate appears instantly. Also, X does not exhibit geometrical isomerism.
The CORRECT option(s) for X is/are
Your answerSelect all correct options. You can choose more than one.
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Open questionXL-PMSQ2 marksNeeds review
The paramagnetic species among the following is/are
(Given: Atomic numbers of Cr = 24; Fe = 26; Ni = 28)
Your answerSelect all correct options. You can choose more than one.
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Open questionXL-PMSQ2 marksNeeds review
The molecule(s) with non-zero dipole moment is/are
Your answerSelect all correct options. You can choose more than one.
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Open questionXL-PNAT2 marksNeeds review
The ionic product of water at 40 °C is 2.92 × 10⁻¹⁴ M². The pH of water at 40 °C is __________ (rounded off to 2 decimal places).
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