NAT Scientific Aptitude 1 ā Questions and Answers
Question 1: Which of the following best describes the process of osmosis?
- Movement of solute molecules from high to low concentration
- Movement of water molecules through a semipermeable membrane from low to high solute concentration (Correct answer)
- Active transport of ions against a concentration gradient
- Diffusion of gases across a cell membrane
Correct answer: Movement of water molecules through a semipermeable membrane from low to high solute concentration
Osmosis is the passive movement of water through a semipermeable membrane from a region of lower solute concentration to higher solute concentration.
Question 2: What is the unit of electrical resistance in the SI system?
- Ampere
- Volt
- Ohm (Correct answer)
- Watt
Correct answer: Ohm
The ohm (Ī©) is the SI unit of electrical resistance, defined as the resistance that produces a potential difference of one volt when one ampere flows through it.
Question 3: Which law states that the volume of a gas is directly proportional to its absolute temperature at constant pressure?
- Boyle's Law
- Charles's Law (Correct answer)
- Avogadro's Law
- Dalton's Law
Correct answer: Charles's Law
Charles's Law states that at constant pressure, the volume of a fixed amount of gas is directly proportional to its absolute (Kelvin) temperature.
Question 4: An object with a mass of 10 kg is accelerated at 5 m/sĀ². What is the net force acting on it?
- 2 N
- 15 N
- 50 N (Correct answer)
- 0.5 N
Correct answer: 50 N
By Newton's Second Law, Force = mass Ć acceleration = 10 kg Ć 5 m/sĀ² = 50 N.
Question 5: Which part of the cell is responsible for producing ATP through cellular respiration?
- Nucleus
- Ribosome
- Mitochondria (Correct answer)
- Golgi apparatus
Correct answer: Mitochondria
Mitochondria are the sites of cellular respiration where ATP is produced through processes like the Krebs cycle and oxidative phosphorylation.
Question 6: What type of chemical bond is formed when electrons are shared between two atoms?
- Ionic bond
- Covalent bond (Correct answer)
- Hydrogen bond
- Metallic bond
Correct answer: Covalent bond
A covalent bond is formed when two atoms share one or more pairs of electrons, as opposed to ionic bonds where electrons are transferred.
Question 7: Which of the following is a property of acids?
- They have a pH above 7
- They turn red litmus paper blue
- They release hydroxide ions in solution
- They have a sour taste and react with metals to produce hydrogen gas (Correct answer)
Correct answer: They have a sour taste and react with metals to produce hydrogen gas
Acids have a pH below 7, taste sour, turn blue litmus paper red, and react with metals to produce hydrogen gas.
NAT Scientific Aptitude 1
Which of the following best describes the process of osmosis?