If a sample of soil is found to have a pH value of 8.25, it is:

• acidic
• neutral
• alkaline
• None of the above
Correct Option: C  [ alkaline ]

Remark:

Which among the following is a large spectrum Antibiotic ?

• Paracetamol
• Penicillin
• Ampicillin
• chloramphenicol
Correct Option: C  [ Ampicillin ]

Remark:

In a forest ecosystem, green plants are

• the primary producers.
• the secondary consumers.
• the decomposers.
• both secondary consumers and decomposers.
Correct Option: A  [ the primary producers. ]

Remark: The green plant in the ecosystem are called producers. In a terrestrial ecosystem, major producers are herbaceous and woody plants. Likewise, producers in an aquatic ecosystem are various species like phytoplankton, algae and higher plants.

Brass gets discoloured in air due to constant exposure in presence of:

• Aluminium sulphide
• Aluminium phosphide
• Hydrogen sulphide
• Hydrogenated wafers
Correct Option: C  [ Hydrogen sulphide ]

Remark:

An electric bulb has a filament made of

• Boron carbide
• Tungsten
• Tantalum
• Rhenium
Correct Option: B  [ Tungsten ]

Remark:

The number of milk teeth in man is

• 28
• 29
• 20
• 12
Correct Option: C  [ 20 ]

Remark:

Which of the following compounds is used in fire extinguishers ?

• Sodium carbonate
• Sodium bicarbonate
• Sodium nitrate
• Sodium sulphate
Correct Option: B  [ Sodium bicarbonate ]

Remark:

Sphygmomanometer is an instrument used for measuring

• Heart beat
• Vision of eyes
• Blood Sugar
• Blood Pressure
Correct Option: D  [ Blood Pressure ]

Remark:

The addition of gypsum to Portland cement helps in:

• increasing the strength of cement
• rapid setting of cement
• preventing rapid setting of cement
• reducing in the cost of cement
Correct Option: C  [ preventing rapid setting of cement ]

Remark:

Who among the following is considered as the father of artificial intelligence ?

• Charles Babbage
• Lee De Forest
• John McCarthy
• J. P. Eckert
Correct Option: C  [ John McCarthy ]

Remark: