UPSC ESE Prelims 2026 Civil Engineering Question Paper (08-Feb-2026)

Question 1

Water absorption for burnt clay heavy duty bricks should not be more than :

Accepted Answer

10 percent

Answer

20 percent

Answer

5 percent

Answer

15 percent

Question 2

The decomposition of felspar is represented as $K_2Al_2O_3.6H_2O + CO_2 + nH_2O = $

Accepted Answer

$K_2CO_3 + Al_2O_3.2SiO_2.2H_2O + 4SiO_2.nH_2O$

Answer

$K_2CO_3 + Al_2O_3.SiO_2.2H_2O + 4SiO_2.nH_2O$

Answer

$K_2CO_3 + Al_2O_3.2SiO_2.H_2O + 4SiO_2.nH_2O$

Answer

$K_2CO_3 + Al_2O_3.SiO_2.H_2O + 4SiO_2.nH_2O$

Question 3

The metal oxide used to make emerald green glass is:

Accepted Answer

$Cr_2O_7$

Answer

$MnO_2$

Answer

Cobalt oxide

Answer

Iron oxide

Question 4

Match the following lists: List-IList-IIP. Cupping1. Caused by wood limbs encased by wood of the free trunkQ. Bowing2. Caused by grain irregularities in the boardR. Checks3. Small cracks appearing at the ends of boards due to rapid dryingS. Knots4. Unequal shrinking in the radial and tangential direction Select the correct answer using the code given below:

Accepted Answer

PQRS4231

Answer

PQRS2413

Answer

PQRS1243

Answer

PQRS3124

Question 5

Which one of the following statements is $not$ correct regarding the fineness of cement?

Accepted Answer

Fine cement shows faster rate of heat evolution and total quantity of heat evolved is much larger than coarse cement.

Answer

Fine cement is more liable to suffer from shrinkage cracking than a coarse cement.

Answer

Fine cement will show faster rate of hardening than coarse cement.

Answer

Fine cement shows the same setting time as coarse cement.

UPSC ESE Prelims 2026 Civil Engineering Question Paper (08-Feb-2026)

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List-I	List-II
P. Cupping	1. Caused by wood limbs encased by wood of the free trunk
Q. Bowing	2. Caused by grain irregularities in the board
R. Checks	3. Small cracks appearing at the ends of boards due to rapid drying
S. Knots	4. Unequal shrinking in the radial and tangential direction