Which one of the following is a sound reflecting material?

• Thermocol

• Fabric

• Jute Cloth

• Glass

Which finish impart a glossy look to wall?

• Oil Paint

• Lime Wash

• Distemper

• Plaster

What is this?

• rebar

• I beam

• Marble

• granite

It is the perfect material for constructing large structures such as tower blocks and bridges.

• Steel

• reinforced concrete

Taj Mahal is made up of _______.

• Yellow Marble

• Makrana Marble

• Abu Black Marble

• Rajnagar Marble

Gypsum consists of

• $H_2S\ and\ CO_2$

• $CaSO_4\ and\ H_2O$

• $Lime\ and\ H_2O$

• $CO_{2\ }and\ Calcium$

The minimum compressive strength of 2nd class bricks should be

• 75 kg/ $cm^2$

• 100 kg/ $cm^2$

• 90 kg/ $cm^2$

• 120 kg/ $cm^2$

The standard size of masonary bricks is

• $20cm\ \times\ 10cm\ \times\ 10cm$

• $18cm\ \times\ 8cm\ \times\ 8cm$

• $19cm\ \times\ 9cm\ \times\ 9cm$

• $21cm\ \times\ 11cm\ \times\ 11cm$

Which of the following has more fire resisting characteristics?

• Marble

• Compact Sand Stone

• Granite

• Lime stone

The basic purpose of a retarder in concrete is

• To increase the initial setting time of cement paste in concrete

• To decrease the initial setting time of cement paste in concrete

• To render the concrete more water tight

• To improve the workability of concrete mix