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:

In 1643, an Italian named Evangelista Torricelli invented:

• Thermometer
• Barometer
• Ritcher Scale
• Bar Codes
Correct Option: B  [ Barometer ]

Remark:

What changes will happen to a ball of ice and water kept at exactly zero degree Celsius?

• All ice will melt
• All water will become ice
• No change will happen
• Only some ice will melt
Correct Option: C  [ No change will happen ]

Remark:

Sound-waves from a loud speaker is caused by:

• frequency
• vibrations
• pitch
• amplitude
Correct Option: B  [ vibrations ]

Remark:

Electric appliances have star rating ( upto 5 stars) on them. More the number of stars :

1. longer is the life span of the appliance
2. more stringent is the quality checks
3. Higher is the energy efficiency of the appliance

Which of the above is / are correct ?

• 1 only
• 3 only
• 1 and 2 only
• 1, 2 and 3
Correct Option: B  [ 3 only ]

Remark:

A device that is responsible for changing the voltage is:

• Transformer
• Encoder
• Decoder
• Translator
Correct Option: A  [ Transformer ]

Remark:

Which is the largest part of the human brain ?

• Medulla Oblongata
• Cerebellum
• Cerebellum
• none of them
Correct Option: C  [ Cerebellum ]

Remark:

Opium is derived from which part of poppy plant ?

• Seeds
• Leaves
• Bark
• Capsule
Correct Option: D  [ Capsule ]

Remark:

The most abundant metal in the Earth crust is:

• zinc
• copper
• aluminium
• iron
Correct Option: C  [ aluminium ]

Remark:

Which of the following allow the electric current to pass through it ?

• Glasses
• Graphite
• Rubber
• PVC
Correct Option: B  [ Graphite ]

Remark: