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

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

Remark:

Which among the following is respiratory pigment in human beings?

• Melanin
• Haemoglobin
• Rhodopsin
• Bilirubin
Correct Option: B  [ Haemoglobin ]

Remark:

What is the purpose of 'Anemometer'?

• To measure blood pressure.
• To measure the velocity and to find the direction of wind.
• To measure altitude.
• none of these.
Correct Option: B  [ To measure the velocity and to find the direction of wind. ]

Remark:

Who discovered electromagnetic nature of light?

• Young
• Snell
• Newton
• Maxwell
Correct Option: D  [ Maxwell ]

Remark:

Light year is a unit of measurement of

• speed of light
• stellar distances
• speed of rockets
• time
Correct Option: B  [ stellar distances ]

Remark:

The function of ball bearing in a wheel is:

• to increase friction
• to convert kinetic friction into rolling friction
• to convert static friction into kinetic friction
• just for convenience
Correct Option: B  [ to convert kinetic friction into rolling friction ]

Remark:

Sound waves in air are

• Transverse
• Longitudinal
• Electromagnetic
• Polarized
Correct Option: B  [ Longitudinal ]

Remark:

ELISA stands for:

• Enzyme-linked immunosorbent assay
• Epithelium lesions in surface analysis
• Energy-linked immunity assay
• Enzyme-linked immunity analysis
Correct Option: A  [ Enzyme-linked immunosorbent assay ]

Remark:

The edible part of potato is

• Root
• Tuber
• Rhizome
• Corm
Correct Option: B  [ Tuber ]

Remark: Stems get modified into underground structures for storage of food as seen in potato called tuber.

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