# Quiz Set 6

Question 1: What is the SI unit of electric current? A) Ohm B) Watt C) Volt D) Ampere

Explanation: The correct answer is D) Ampere. The ampere (A) is the SI unit of electric current, representing the rate of flow of electric charge.

Question 2: Which law states that every action has an equal and opposite reaction? A) Newton’s First Law B) Newton’s Second Law C) Newton’s Third Law D) Law of Conservation of Energy

Explanation: The correct answer is C) Newton’s Third Law. Newton’s Third Law of Motion states that for every action, there is an equal and opposite reaction.

Question 3: What is the speed of light in a vacuum? A) 300,000 kilometers per hour B) 300,000 meters per second C) 300,000 miles per second D) 186,000 miles per second

Explanation: The correct answer is B) 300,000 meters per second. The speed of light in a vacuum is approximately 299,792,458 meters per second.

Question 4: Which phenomenon occurs when a wave encounters an obstacle and bends around it? A) Reflection B) Diffraction C) Refraction D) Interference

Explanation: The correct answer is B) Diffraction. Diffraction is the bending of waves around obstacles and the spreading of waves as they pass through openings.

Question 5: What is the measure of the total energy of motion and position in an object? A) Kinetic Energy B) Potential Energy C) Thermal Energy D) Gravitational Energy

Explanation: The correct answer is A) Kinetic Energy. Kinetic energy is the energy of motion possessed by an object due to its velocity.

Question 6: Which law states that the entropy of an isolated system will never decrease over time? A) Newton’s Law of Cooling B) Boyle’s Law C) Second Law of Thermodynamics D) Kepler’s Third Law

Explanation: The correct answer is C) Second Law of Thermodynamics. The Second Law of Thermodynamics states that the entropy of an isolated system will tend to increase, and natural processes are irreversible.

Question 7: What does the term “refraction” refer to in optics? A) The change in direction of a wave as it passes through a medium B) The reflection of light off a surface C) The splitting of light into its component colors D) The absorption of light by a material

Explanation: The correct answer is A) The change in direction of a wave as it passes through a medium. Refraction occurs when light or other waves change direction as they pass from one medium to another at an angle.

Question 8: What does the “Law of Conservation of Energy” state? A) Energy cannot be created or destroyed, only transferred or transformed B) Energy is constantly increasing in the universe C) Energy is dependent on temperature D) Energy can be created out of nothing

Explanation: The correct answer is A) Energy cannot be created or destroyed, only transferred or transformed. The Law of Conservation of Energy is a fundamental principle stating that the total energy in a closed system remains constant over time.

Question 9: Which type of energy is associated with the motion of molecules and atoms? A) Kinetic Energy B) Potential Energy C) Thermal Energy D) Mechanical Energy

Explanation: The correct answer is C) Thermal Energy. Thermal energy is the energy associated with the motion of particles within a substance.

Question 10: What is the force of attraction between any two masses in the universe called? A) Gravitational Force B) Electromagnetic Force C) Strong Nuclear Force D) Weak Nuclear Force

Explanation: The correct answer is A) Gravitational Force. Gravitational force is the force of attraction between any two masses in the universe, described by Newton’s law of universal gravitation.