Which is the respiratory organ of fish?

• Ears
• Gills
• Skin
• Lungs
Correct Option: B  [ Gills ]

Remark:

The longest day in the southern Hemisphere is on :

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

Remark:

Magnetic effect of current gives rise to which force ?

• mechanical
• frictional
• spring
• gravitational
Correct Option: A  [ mechanical ]

Remark:

Which of the following is the largest ecological unit ?

• Organism
• Population
• Biome
• Ecosystem
Correct Option: C  [ Biome ]

Remark:

Chemical name of 'Baking powder' is :

• Ammonium Chloride
• Magnesium Phosphate
• Sodium bi-carbonate
• Ammonium bi-phosphate
Correct Option: C  [ Sodium bi-carbonate ]

Remark:

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 diseases is not caused by virus ?

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

Remark:

The optimum dissolved oxygen level (in mg/litre) required for survival of aquatic organism is:

• 4-6
• 2-4
• 8-10
• 12-16
Correct Option: A  [ 4-6 ]

Remark:

The speed of light will be minimum while passing through :

• Glass
• Vacuum
• Air
• Water
Correct Option: A  [ Glass ]

Remark:

Red light is used in traffic signals because:

• It has the longest wavelength
• It is beautiful
• It is visible to people even with bad eyesight
• None of these
Correct Option: A  [ It has the longest wavelength ]

Remark: