Hard steel contains

• 2 to 5 per cent carbon

• 0.5 to 1.5 per cent carbon

• 0.1 to 0.4 per cent carbon

• 0.01 to 0.04 per cent carbon

100.

Which is the most stable eco-system?

• Desert

• Ocean

• Mountain

• Forest

The temperature of oxy-acetylene flame is around

• 2800°C

• 3200°C

• 4000°C

• 1500°C

Microsoft Office's personal information manager is

• Outlook

• Internet Explorer

• Organizer

• Access

What did the first electronic digital computer contain?

• Transistors

• Valves

• Core memory

• Semiconductor memory

Glass is a

• superheated solid

• supercooled liquid

• supercooled gas

• superheated liquid

Among the following materials sound travels fastest in

• steel

• air

• vacuum

• water

Which phenomenon do bats or dolphins use to find prey, predators or obstacles?

• Refraction of sound

• Formation of beats

• Scattering of sound

• Echo location

Cement is formed by strongly heating a mixture of

• limestone and graphite

• limestone and clay

• chalk and graphite

• clay and graphite

The rear side of the Moon was photographed by

• Viking I

• Viking II

• Luna III

• Mariner IX