Plants prepare their food by:

• photosynthesis
• carbohydrolysis
• metabolic synthesis
• photorespiration
Correct Option: A  [ photosynthesis ]

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:

Which of the following is a communicable disease?

• Measles
• Scurvy
• Asthma
• Diabetes
Correct Option: A  [ Measles ]

Remark:

What is the rarest blood type in the world ?

• A
• O positive
• AB ^_
• B
Correct Option: C  [ AB^- ]

Remark:

A transformer is used to :

• Increase or decrease D.C voltage
• Increase or decrease A.C voltage
• Convert A.C to D.C
• Convert D.C into A.C
Correct Option: B  [ Increase or decrease A.C voltage ]

Remark:

Which of the following allow the electric current to pass through it ?

• Glasses
• Graphite
• Rubber
• PVC
Correct Option: B  [ Graphite ]

Remark:

Which one of the following has the highest fuel value ?

• Hydrogen
• Charcoal
• Natural gas
• Gasoline
Correct Option: A  [ Hydrogen ]

Remark: "Hydrogen" has the highest calorific value among commonly used fuels because it has a very high energy content, undergoes complete combustion, has a high heat of combustion, and can be used in various applications.

Lens is made up of:

• pyrex glass
• flint glass
• ordinary glass
• cobalt glass
Correct Option: B  [ flint glass ]

Remark:

Which of the following is chiefly present in LPG?

• Methane
• Ethane
• Propane
• Butane
Correct Option: D  [ Butane ]

Remark:

Which microorganism is responsible for Dengue fever?

• Fungi
• Viruses
• Bacteria
• Protozoa
Correct Option: B  [ Viruses ]

Remark: transmitted by mosquitoes 'Aedes aegypti'.