1.Spray painting is used to:
a) Apply paint without touching surface
b) Apply large amount of paint
c) Reach high areas
d) Get textured paint
Explanation: Spray painting delivers a small amount of paint and gives the surface a smooth finish. Rollers are used to reach high areas.
2. The open-time of paint can be extended by adding white spirit.
a) True
b) False
Explanation: Open-time is the time interval, after the application of liquid paint, during which other paint can be applied to give artistic effect. White spirit, Dowanol can be used. These allow different layers of wet paints to mix together and give a textured appearance.
3. Which of the below has a sheen and is highly washable?
a) Acrylic flat
b) Acrylic eggshell
c) Acrylic satin
d) Acrylic gloss
Explanation: It has a satin finish. Compared to other types, it is more durable and washable.
4. Fine Aggregates should pass through which IS sieve?
a) 2.35mm
b) 45µ
c) 4.75mm
d) 75µ
Explanation: 4.75mm IS sieve is the aggregate size deciding sieve. Anything retained on sieve is coarse aggregate and the ones that pass through sieve are fine aggregates.
5. How many types of fine aggregates are there based on source?
a) 3
b) 2
c) 4
d) 6
Explanation: Three types are natural sand (river banks), crushed stone sand (hard stone) and crushed gravel sand (gravel).
6. What is the fineness modulus value of a fine sand?
a) <2.2
b) 2.2-2.6
c) <1
d) 1-2
Explanation: Based on the fineness of sand, there are very fine sand, fine sand, medium sand, coarse sand and very coarse sand. Fine sand has fineness modulus between 2.2-2.6.
7. M-Sand has ___________ type of particle shape.
a) Flaky
b) Round
c) Angular
d) Cubical
Explanation: The stone is crushed to obtain M-Sand. The shape of the crushed stone is cubical and it has rounded edges.
8. Which of the below can be used as fine aggregates?
a) Lime
b) Splinters
c) Surkhi
d) Rice Husk
Explanation: Surkhi consists of broken brick pieces. They can be ground to the size of fine aggregates
9. The specific gravity for sand is:
a) 2.6
b) 2.65
c) 2.8
d) 2.75
Explanation: As per the results from specific gravity test in pycnometer, this specific gravity for sand is 2.6.
10. In the ratio 1:4:8, which number indicates the quantity of fine aggregates?
a) 1
b) 4
c) 8
d) None
Explanation: For plain cement concrete (PCC), ratio 1:4:8 is usually used. The ratio is of cement: fine aggregates: coarse aggregates. Hence, 4 is the quantity of fine aggregates.