Acid rain is caused due to the pollution of environment by:

• Carbondioxide and Nitrogen
• Carbon monoxide and Carbondioxide
• Ozone and Methane
• Some oxide of Nitrogen and Sulpher
Correct Option: D  [ Some oxide of Nitrogen and Sulpher ]

Remark: Acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air

Compound microscope has

• two lenses
• requires UV light source
• used to view only dead organisms
• requires large room space
Correct Option: A  [ two lenses ]

Remark:

India first atomic device was exploded in 1974 at:

• Bikaner
• Barmed
• Pokhran
• Jaisalmer
Correct Option: C  [ Pokhran ]

Remark: Pokhran is a city in Rajasthan

Which of the following diseases is not caused by virus ?

• Small pox
• AIDS
• Flue
• Malaria
Correct Option: D  [ Malaria ]

Remark:

What is the rarest element on earth?

• Radium
• Einsteinium
• Astatine
• none of these
Correct Option: C  [ Astatine ]

Remark: Astatine is a very rare radioactive chemical element with the chemical symbol At and atomic number 85

Any part of the computer, which can be seen by the eyes and felt by touching, is called:

• Hardware
• Software
• Liveware
• Firmware
Correct Option: A  [ Hardware ]

Remark:

Which of the following statements is correct ?

• Protons are negatively charged and are present in the nucleus
• Electrons are positively charged and are present in the nucleus
• Electrons are negatively charged and are present in the orbits
• The entire mass of atom is distributed in the orbits
Correct Option: C  [ Electrons are negatively charged and are present in the orbits ]

Remark:

Sound waves having frequency less than 20 Hz are called __________ waves.

• Intelligent
• Inferior
• Infrasonic
• Instrumental
Correct Option: C  [ Infrasonic ]

Remark:

Full form of "GPS" is

• Geographic Pointing System
• Global Positioning System
• Geographic Photo Sensor
• Global Polar Synchronization
Correct Option: B  [ Global Positioning System ]

Remark:

Seismology is the science of :

• Atmosphere
• Earthquake
• Fossil
• Silkworm breeding
Correct Option: B  [ Earthquake ]

Remark: