Deck 3: Bricks, Trees, and Aggregates

Question 1

What is the harmful effect of presents of alkali in brick earth on bricks?

A)Discolourises bricks
B)Efflorescence
C)Porous bricks
D)Flaking

Answer 1

Efflorescence

Question 2

Why do bricks become brittle when excess silica is present?

A)Pores are created
B)Flaking occurs
C)Thermal stability is lost
D)Cohesion is lost

Answer 2

Cohesion is lost

Question 3

Which of the following leads to the formation of small pores in brick?

A)Iron pyrites
B)Pebbles
C)Organic matter
D)Alkalis

Answer 3

Organic matter

Question 4

The presence of which of the below renders clay totally unsuitable for brick manufacture?

A)Kallar
B)Kankar
C)Hay
D)Lime

Question 5

Unburnt bricks are also called:

A)Dry bricks
B)Clayey bricks
C)Kucha bricks
D)Clamp bricks

Question 6

Burnt bricks can be further classified into how many types?

A)2
B)4
C)3
D)5

Question 7

First class bricks are used for:

A)Brick ballast in R.C.C
B)Boundary walls
C)Low height walls
D)Pavements

Question 8

The minimum crushing strength of third class brick is:

A)3.5 N/mm2
B)7 N/mm2
C)10 N/mm2
D)20 N/mm2

Question 9

Which of the following is not a feature of second class bricks?

A)Have small irregularities
B)Water absorption is between 20-25%
C)Rectangular in shape
D)Free from cracks

Question 10

Trees are generally classified, based on the mode of growth into:

A)2
B)4
C)6
D)3

Question 11

What is the life time of a moderately durable timber?

A)10-20 years
B)1-5 years
C)10-15 years
D)5-10 years

Question 12

Which of the following is an example of soft wood?

A)Sal
B)Oak
C)Deodar
D)Mahogany

Question 13

Which IS Code gives a classification of commercial timbers and their zonal distribution?

A)IS 620
B)IS 399
C)IS 401
D)IS 190

Question 14

Hard wood is strong in tension and weak in compression.

Question 15

Exogenous trees are further divided into:

A)3
B)4
C)2
D)5

Question 16

Which of the below is a property of soft wood?

A)Medullary rays are less distinct
B)Annual rings are less distinct
C)Dark in colour
D)Close grained structure

Question 17

Fine Aggregates should pass through which IS sieve?

A)2.35mm
B)45µ
C)4.75mm
D)75µ

Question 18

How many types of fine aggregates are there based on source?

A)3
B)2
C)4
D)6

Question 19

What is the fineness modulus value of a fine sand?

A)<2.2
B)2.2-2.6
C)<1
D)1-2

Question 20

M-Sand has ___________ type of particle shape.

A)Flaky
B)Round
C)Angular
D)Cubical

Question 21

The specific gravity for sand is:

A)2.6
B)2.65
C)2.8
D)2.75

Question 22

Graded aggregate contains particles of size:

A)Single grade
B)4.75mm
C)Multi grade
D)<80mm

Question 23

Flaky particles have:

A)Small thickness
B)Elongated sides
C)Sharp edges
D)Rounded edges

Question 24

Which size coarse aggregate is ideal for use in a concrete mix?

A)Smaller
B)4.75-10mm
C)Larger
D)10-20mm

Question 25

In crushing test on coarse aggregates, what size particle is taken as a sample?

A)Passing 12.5mm IS sieve
B)Retained on 10mm IS sieve
C)Passing 10mm and retained on 4.75mm IS sieve
D)Passing 12.5mm and retained on 10mm IS sieve