Which of the following is not a biofertilizer ?

• Rhizobium
• Mucor
• Azotobacter
• Anabaena
Correct Option: B  [ Mucor ]

Remark:

A CD-ROM is a kind of:

• Optical disk
• Magnetic disk
• Fibre disk
• None of these
Correct Option: A  [ Optical disk ]

Remark:

Which of the following colours is not seen in a rainbow ?

• Yellow
• Green
• Red
• Brown
Correct Option: D  [ Brown ]

Remark:

Which layer of the atmosphere is nearest to the surface of the earth?

• Mesosphere
• Thermosphere
• Troposphere
• Stratosphere
Correct Option: C  [ Troposphere ]

Remark:

The waves which can propagate even through the vacuum,are called __________.

• Mechanical waves
• Reverse waves
• Inverted waves
• Electromagnetic waves
Correct Option: D  [ Electromagnetic waves ]

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:

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:

India first atomic device was exploded in 1974 at:

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

Remark: Pokhran is a city in Rajasthan

Thiamine deficiency or beriberi, refers to the lack of:

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

Remark:

The mountaineers carry oxygen with them because:

• at an altitude of more than 5 km there is no air
• the amount of air available to a person on mountain is lesser than that available on the ground
• the temperature of air is lesser than that on the ground.
• The pressure of air is higher than that on the ground.
Correct Option: B  [ the amount of air available to a person on mountain is lesser than that available on the ground ]

Remark: