The longest cell in animals is

• Nerve cell
• Hepatocyte (Liver cell)
• Blood cell
• Muscle cell
Correct Option: A  [ Nerve cell ]

Remark:

The "powerhouse" of cell is:

• Nucleus
• Lysosome
• Mitochondria
• DNA
Correct Option: C  [ Mitochondria ]

Remark: Mitochondria are membrane-bound cell organelles that generate most of the chemical energy needed to power the cell's biochemical reactions. Chemical energy produced by the mitochondria is stored in a small molecule called adenosine triphosphate (ATP).

Which is an example of pollution-free energy?

• Coal
• Wind energy
• Mineral oil
• None of these
Correct Option: B  [ Wind energy ]

Remark:

A fan produces a feeling of comfort during hot weather because:

• fan supplies cool air
• our body radiates more heat in air
• conductivity of air increases
• our perspiration evaporates rapidly
Correct Option: D  [ our perspiration evaporates rapidly ]

Remark:

Normal human blood is:

• Acidic
• Alkaline
• Neutral
• Variable
Correct Option: B  [ Alkaline ]

Remark:

Which of the following statements is not correct ?

• Rh⁺ person can donate blood to Rh⁺ person
• Rh^- person can donate blood to Rh^- person
• Rh^- person can donate blood to Rh⁺ person
• Rh⁺ person can donate blood to Rh^- person
Correct Option: D  [ Rh⁺ person can donate blood to Rh^- person ]

Remark:

Which of the following diseases is not caused by virus ?

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

Remark:

Acupuncture is a medical system of treatment in which:

• herbs are used to relieve pain
• needles are inserted into particular parts of the body to relieve pain
• surgery is done to relieve pain
• none of these
Correct Option: B  [ needles are inserted into particular parts of the body to relieve pain ]

Remark:

Oxidation is a process which involves

• addition of Oxygen.
• addition of Hydrogen.
• removal of Oxygen.
• addition of Nitrogen.
Correct Option: A  [ addition of Oxygen. ]

Remark: the term "oxidation" is defined as the addition of oxygen/electronegative element to a substance or removal of hydrogen/electropositive element from a substance.

Which of the following is a vector?

• Mass
• Volume
• Speed
• Velocity
Correct Option: D  [ Velocity ]

Remark: