Scientific Aptitude Flashcards
7 cards from real NAT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Scientific Aptitude flashcards as text
Which of the following best describes an exothermic reaction?
Answer: A reaction that releases heat into the surroundings
An exothermic reaction releases energy (usually heat) into the surroundings, resulting in a negative change in enthalpy (ΔH < 0).
What is the primary function of the kidneys in the human body?
Answer: Filtering blood and regulating fluid and electrolyte balance
The kidneys filter blood to remove waste products and excess substances, producing urine, while also regulating blood pressure and electrolyte balance.
Which of the following is an example of a physical change?
Answer: Dissolving sugar in water
Dissolving sugar in water is a physical change because no new chemical substance is formed; the sugar can be recovered by evaporation.
What is the SI unit of electric current?
Answer: Ampere
The ampere (A) is the SI base unit of electric current, defined as one coulomb of charge flowing per second past a given point.
Which of the following organelles contains its own DNA and is thought to have originated from ancient prokaryotes?
Answer: Mitochondria and chloroplasts
Mitochondria and chloroplasts contain their own circular DNA and ribosomes, supporting the endosymbiotic theory that they evolved from ancient free-living bacteria.
A ball is thrown vertically upward. At its maximum height, what is its velocity?
Answer: Zero
At maximum height, the ball momentarily stops before falling back down, so its velocity is zero at that instant.
Which gas makes up the largest percentage of Earth's atmosphere?
Answer: Nitrogen
Nitrogen (N₂) makes up approximately 78% of Earth's atmosphere, making it the most abundant atmospheric gas.