Which layer of gas in the atmosphere protects us from harmful ultra violet rays of the sun?

• Oxygen
• Carbon dioxide
• Nitrogen
• Ozone
Correct Option: D  [ Ozone ]

Remark:

The longest day in the southern Hemisphere is on :

• 22nd December
• 21st June
• 21st March
• 23rd September
Correct Option: A  [ 22nd December ]

Remark:

Magnification produced by a rear view mirror fitted in vehicles:

• is less than the object
• is more than the object
• is equal to the object
• can be more or less than the object depending upon the position of object in front of it.
Correct Option: A  [ is less than the object ]

Remark:

In India which is the most widely used form of renewable energy ?

• Geothermal energy
• Hydro-electric energy
• Solar energy
• Thermal energy
Correct Option: C  [ Solar energy ]

Remark:

Alcohol contains :

• nitrogen, hydrogen, oxygen
• carbon, hydrogen, oxygen
• oxygen, carbon, nitrogen
• hydrogen, chlorine, oxygen
Correct Option: B  [ carbon, hydrogen, oxygen ]

Remark:

What is 'Agent Orange' ?

• An insecticide
• A herbicide
• A fertiliser
• A biofertiliser
Correct Option: B  [ A herbicide ]

Remark:

In a computer, the parity bit is added for the purpose of:

• Coding
• Error detection
• Controlling
• Indexing
Correct Option: B  [ Error detection ]

Remark:

The pH of human blood is:

• 7.2
• 7.8
• 6.6
• 7.4
Correct Option: D  [ 7.4 ]

Remark:

Thiamine deficiency or beriberi, refers to the lack of:

• vitamin K
• vitamin B1
• vitamin C
• nicotine
Correct Option: B  [ vitamin B1 ]

Remark:

A fuse wire has :

• high resistance and high melting point
• low resistance and high melting point
• low resistance and low melting point
• high resistance and low melting point
Correct Option: D  [ high resistance and low melting point ]

Remark: