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:

The amount of light entering into eye can be controlled and regulated by ___________ .

• Sclera
• cornea
• pupil
• retina
Correct Option: C  [ pupil ]

Remark:

Which one of the following allows sound waves to travel comparatively faster at 0°C ?

• Water
• Air
• Ice
• Iron
Correct Option: D  [ Iron ]

Remark:

India's first supercomputer is known as:

• SAGA
• PARAM 8000
• EKA
• PARAM YUVA
Correct Option: B  [ PARAM 8000 ]

Remark:

Oxygen is transported to the cells of the human body through:

• Red Blood cells
• White Blood cells
• Hormones
• Enzymes
Correct Option: A  [ Red Blood cells ]

Remark:

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

Which of the following is not an element ?

• Oxygen
• Nitrogen
• Hydrogen
• Marble
Correct Option: D  [ Marble ]

Remark:

Fathom is unit of:

• Depth
• Distance
• Frequency
• Sound
Correct Option: A  [ Depth ]

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:

The technique of 'DNA sequencing' was discovered by:

• H. G. Khorana
• Watson and Crick
• Frederick Sanger
• E. M. Southern
Correct Option: B  [ Watson and Crick ]

Remark: