Vermiculite is a hydrous phyllosilicate mineral. Where soils are sandy, mixing of vermiculite into the soil will allow the soil to hold the water and air needed for growth.

Correct Option: D

Vermiculite is a hydrous phyllosilicate mineral. Where soils are sandy, mixing of vermiculite into the soil will allow the soil to hold the water and air needed for growth.

Lewis Mumford, american sociologist and philosopher, has given six categories of the growth of a town which are as follows : Eopolis, Polis, Metropolis(Mother city), Megapolis, Tyrannopolis and Necropolis. Necropolis is the last stage implying the death of the city. The word ‘Necropolis’ originates from the ancient Greek ‘Nekropolis’, meaning ‘City of the dead’.

Correct Option: C

Lewis Mumford, american sociologist and philosopher, has given six categories of the growth of a town which are as follows : Eopolis, Polis, Metropolis(Mother city), Megapolis, Tyrannopolis and Necropolis. Necropolis is the last stage implying the death of the city. The word ‘Necropolis’ originates from the ancient Greek ‘Nekropolis’, meaning ‘City of the dead’.

Aerated concrete is produced by introducing gas into a concrete, the amount is dependent upon the requirements for strength. One method to achieve this is by using powdered aluminium which reacts with the calcium hydroxide produced upon hydration of the cement to form the hydrogen gas that foams and doubles the volume of the raw mix creating gas bubbles. However, an increase in aluminium cont ent causes a decrease in the compressive and tensile strengths. It also produces a decrease in the modulus of elasticit y. When the aluminium content is increased, the density is decreased and the porosity is increased.

Correct Option: A

Aerated concrete is produced by introducing gas into a concrete, the amount is dependent upon the requirements for strength. One method to achieve this is by using powdered aluminium which reacts with the calcium hydroxide produced upon hydration of the cement to form the hydrogen gas that foams and doubles the volume of the raw mix creating gas bubbles. However, an increase in aluminium cont ent causes a decrease in the compressive and tensile strengths. It also produces a decrease in the modulus of elasticit y. When the aluminium content is increased, the density is decreased and the porosity is increased.

The colours opposite to each other are complementary colours.

Correct Option: B

The colours opposite to each other are complementary colours.

Illumination Level of the room = 300 lux = 300 lumen/sq m
Efficacy of the lamps = 60 lumen/watt

Correct Option: B

Illumination Level of the room = 300 lux = 300 lumen/sq m
Efficacy of the lamps = 60 lumen/watt