Life Sciences
GATE XL purpose:exam-prep PYQs
Build your understanding with focused practice from past exam papers.
Questions 131–140 of 1235. Imported answers require independent review unless marked reviewed.
Question 9
Open questionGAMCQ2 marksNeeds review
A business person buys potatoes of two different varieties P and Q, mixes them in a certain ratio and sells them at ₹ 192 per kg.
The cost of the variety P is ₹ 800 for 5 kg.
The cost of the variety Q is ₹ 800 for 4 kg.
If the person gets 8% profit, what is the P:Q ratio (by weight)?
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Open questionGAMCQ2 marksNeeds review
Three villages P, Q, and R are located in such a way that the distance PQ = 13 km, QR = 14 km, and RP = 15 km, as shown in the figure. A straight road joins Q and R. It is proposed to connect P to this road QR by constructing another road. What is the minimum possible length (in km) of this connecting road?
Note: The figure shown is representative.
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Open questionXL-PMCQ1 markNeeds review
The rate of solvolysis for the following tertiary halides in 80% aqueous ethanol at 25 °C follows the order
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Open questionXL-PMCQ1 markNeeds review
The CORRECT order of boiling points for the hydrogen halides is
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Open questionXL-PMCQ1 markNeeds review
The bond order in
species isYour answerChoose one option.
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 14
Open questionXL-PMCQ1 markNeeds review
The standard enthalpy of the reaction,
is found to be
and the
value for CO (g) is
.
The value of
(in
) for H
O (g) is(The standard enthalpies of formation of elements in their reference states are zero at all temperatures)
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Open questionXL-PMCQ1 markNeeds review
The temperature dependence of reaction rates is generally given by the Arrhenius equation. A plot of
against
is a straight line from which the pre-exponential factor ‘A’ and the activation energy ‘
’ can be determined.The CORRECT option regarding this plot is
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 16
Open questionXL-PMCQ1 markNeeds review
The isothermal expansion of one mole of an ideal gas from
to
at temperature, T occurs in two ways.Path I: a reversible isothermal expansion;
Path II: free expansion against zero external pressure
The CORRECT option for the values of
,
and
for Path I and Path II isYour answerChoose one option.
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Open questionXL-PMSQ1 markNeeds review
The CORRECT statement(s) regarding the given molecules is(are)
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Open questionXL-PMSQ1 markNeeds review
The CORRECT statement(s) about [Ni(CN)₄]²⁻, [Ni(CO)₄] and [NiCl₄]²⁻ is(are) (Given: Atomic number of Ni: 28)
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