NAT Scientific Aptitude 3

Question 1

Which of the following best describes an exothermic reaction?

Accepted Answer

A reaction that releases heat into the surroundings

Answer

A reaction that absorbs heat from the surroundings

Answer

A reaction that occurs only at high temperatures

Answer

A reaction that requires a catalyst to proceed

Question 2

What is the primary function of the kidneys in the human body?

Accepted Answer

Filtering blood and regulating fluid and electrolyte balance

Answer

Producing red blood cells

Answer

Secreting digestive enzymes

Answer

Producing insulin

Question 3

Which of the following is an example of a physical change?

Accepted Answer

Dissolving sugar in water

Answer

Burning wood

Answer

Rusting iron

Answer

Baking a cake

Question 4

What is the SI unit of electric current?

Accepted Answer

Ampere

Answer

Volt

Answer

Watt

Answer

Coulomb

Question 5

Which of the following organelles contains its own DNA and is thought to have originated from ancient prokaryotes?

Accepted Answer

Mitochondria and chloroplasts

Answer

Nucleus and Golgi apparatus

Answer

Ribosomes and lysosomes

Answer

Endoplasmic reticulum and vacuoles

Question 6

A ball is thrown vertically upward. At its maximum height, what is its velocity?

Accepted Answer

Zero

Answer

Equal to the initial velocity

Answer

Doubled

Answer

Equal to acceleration due to gravity

Question 7

Which gas makes up the largest percentage of Earth's atmosphere?

Accepted Answer

Nitrogen

Answer

Oxygen

Answer

Carbon dioxide

Answer

Argon