Correct Answer: A) Decibel
Explanation: The decibel (dB) is the unit used to measure the intensity of sound waves, reflecting the relative loudness perceived by the human ear.
A) Anemometer
B) Barometer
C) Thermometer
D) Pyrometer
Correct Answer: A) Anemometer
Explanation: An anemometer is a device used to measure wind speed and is a common instrument in meteorological stations to gauge weather conditions.
A) Decibel
B) Pascal
C) Hertz
D) Newton
Correct Answer: A) Decibel
Explanation: The decibel (dB) is the unit used to measure the intensity of sound waves, reflecting the relative loudness perceived by the human ear.
A) Gravitational force
B) Electromagnetic force
C) Nuclear force
D) Frictional force
Correct Answer: D) Frictional force
Explanation: Frictional force is not a fundamental force; it is a force that occurs between two surfaces that are in contact. The fundamental forces in physics are gravitational, electromagnetic, strong nuclear, and weak nuclear forces.
A) It halves
B) It doubles
C) It stays the same
D) It quadruples
Correct Answer: D) It quadruples
Explanation: The energy of a photon is inversely proportional to its wavelength. Therefore, if the wavelength is halved, the energy quadruples.
A) Gas to solid to liquid
B) Solid to gas to liquid
C) Solid to liquid to gas
D) Liquid to solid to gas
Correct Answer: C) Solid to liquid to gas
Explanation: When water is heated, it typically transitions from solid (ice) to liquid (water) to gas (steam).
A) Hooke’s Law
B) Newton’s First Law
C) Newton’s Second Law
D) Newton’s Third Law
Correct Answer: B) Newton’s First Law
Explanation: Newton’s First Law, also known as the law of inertia, states that an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
A) Condensation
B) Evaporation
C) Boiling
D) Sublimation
Correct Answer: C) Boiling
Explanation: Boiling is the rapid vaporization of a liquid, which occurs when a liquid is heated to its boiling point, and it forms vapor both below the surface and at the surface.
A) Dalton’s Law of Partial Pressures
B) Graham’s Law of Effusion
C) Avogadro’s Law
D) Boyle’s Law
Correct Answer: A) Dalton’s Law of Partial Pressures
Explanation: Dalton’s Law of Partial Pressures states that the total pressure exerted by a mixture of non-reacting gases is equal to the sum of the partial pressures of the individual gases.
A) Translation
B) Rotation
C) Revolution
D) Linear motion
Correct Answer: B) Rotation
Explanation: Rotation refers to the motion of a body around a fixed point. It is one of the basic forms of motion observed in the physical world.
A) Ionic bond
B) Hydrogen bond
C) Metallic bond
D) Covalent bond
Correct Answer: D) Covalent bond
Explanation: A covalent bond is a chemical bond that involves the sharing of electron pairs between atoms. These electron pairs are known as shared pairs or bonding pairs.
A) Critical mass
B) Half-life
C) Isotope
D) Reactor core
Correct Answer: A) Critical mass
Explanation: Critical mass is the minimum amount of fissile material needed to maintain a nuclear chain reaction. It is a key concept in nuclear physics, particularly in the context of nuclear reactors and nuclear weapons.
A) Curie
B) Roentgen
C) Sievert
D) Gray
Correct Answer: D) Gray
Explanation: The Gray (Gy) is a derived unit of ionizing radiation dose in the International System of Units (SI) and is used to measure the absorbed dose of radiation energy per unit mass of tissue.
A) Bernoulli’s Principle
B) Archimedes’ Principle
C) Pascal’s Principle
D) Boyle’s Law
Correct Answer: C) Pascal’s Principle
Explanation: Pascal’s Principle, also known as the principle of transmission of fluid-pressure, is a principle in fluid mechanics that states that a change in pressure applied to an enclosed fluid is transmitted undiminished to every point of the fluid and to the walls of its container.
A) Kinetic energy
B) Potential energy
C) Thermal energy
D) Chemical energy
Correct Answer: A) Kinetic energy
Explanation: Kinetic energy is the energy that an object possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity.
A) Barometer
B) Hydrometer
C) Anemometer
D) Calorimeter
Correct Answer: B) Hydrometer
Explanation: A hydrometer is a device used to measure the specific gravity (relative density) of liquids based on the concept of buoyancy.
A) Mass
B) Density
C) Weight
D) Volume
Correct Answer: D) Volume
Explanation: Volume is the amount of space that a substance or object occupies, or that is enclosed within a container.
A) Conductance
B) Resistance
C) Capacitance
D) Inductance
Correct Answer: A) Conductance
Explanation: Conductance is the measure of a material’s ability to conduct an electric current. It is the inverse of resistance and is measured in siemens (S).
A) Critical angle
B) Brewster’s angle
C) Snell’s angle
D) Incidence angle
Correct Answer: D) Incidence angle
Explanation: The incidence angle is the angle at which a ray of light or radiation strikes a surface. It is measured relative to the perpendicular to the surface at the point of contact.
A) Hydraulic jump
B) Hydrostatic pressure
C) Bernoulli’s principle
D) Archimedes’ principle
Correct Answer: B) Hydrostatic pressure
Explanation: Hydrostatic pressure is the pressure exerted by a fluid at equilibrium due to the force of gravity. It increases in proportion to depth measured from the surface because of the increasing weight of fluid exerting downward force from above.
A) Ampère’s Law
B) Coulomb’s Law
C) Ohm’s Law
D) Faraday’s Law
Correct Answer: A) Ampère’s Law
Explanation: Ampère’s Law states that for any closed loop path, the sum of the length elements times the magnetic field in the direction of the length element is equal to the permeability times the electric current enclosed in the loop.
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