A transformer is used to :

• Increase or decrease D.C voltage
• Increase or decrease A.C voltage
• Convert A.C to D.C
• Convert D.C into A.C
Correct Option: B  [ Increase or decrease A.C voltage ]

Remark:

Sound causes hazardous noise pollution at decibels:

• Above 50
• Above 80
• Above 100
• Above 130
Correct Option: B  [ Above 80 ]

Remark:

Goverment of India had set up BEE, an autonomous Goverment Agency under Ministry of Power. BEE stands for:

• Bureau of Energy Efficiency
• Bureau of Electrical and Electronics
• Bureau of Enhanced Energy
• Bureau of Energy Emission
Correct Option: A  [ Bureau of Energy Efficiency ]

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:

An endoscope is used by a physician to view the internal parts of a body organ. It is based on the principle of:

• refraction of light
• re?ection of light
• total internal re?ection of light
• dispersion of light
Correct Option: C  [ total internal re?ection of light ]

Remark:

Mesons are found in

• Laser beam
• X-ray
• Gamma rays
• Cosmic rays
Correct Option: D  [ Cosmic rays ]

Remark:

Olive ridley is related to:

• turtle
• cease fire violations
• terrorist killings
• migratory bird
Correct Option: A  [ turtle ]

Remark:

The exit of food from the stomach is regulated by which muscle

• cardiac
• sphincter
• skeletal
• None of these
Correct Option: B  [ sphincter ]

Remark:

Which among the following elements increases the absorption of water and calcium in plants ?

• Manganese
• Boron
• Copper
• Molybdenum
Correct Option: B  [ Boron ]

Remark:

The phenomenon involved in propagation of light waves throuhg optical fibres is :

• Dispersion of light
• Scattering of light
• Total internal reflection of light
• Refraction of light
Correct Option: C  [ Total internal reflection of light ]

Remark: