Correct Answer: A) Centripetal force
Explanation: Centripetal force is the force that keeps a body moving with a uniform speed along a circular path and is directed inward towards the center of the circle.
A) Weight
B) Mass
C) Density
D) Volume
Correct Answer: B) Mass
Explanation: Mass is a property of a physical body and a measure of its resistance to acceleration when a net force is applied. It also determines the strength of its mutual gravitational attraction to other bodies.
A) Centripetal force
B) Centrifugal force
C) Normal force
D) Tension force
Correct Answer: A) Centripetal force
Explanation: Centripetal force is the force that keeps a body moving with a uniform speed along a circular path and is directed inward towards the center of the circle.
A) Kinetic energy
B) Potential energy
C) Thermal energy
D) Mechanical energy
Correct Answer: B) Potential energy
Explanation: Potential energy is the energy held by an object because of its position relative to other objects, stresses within itself, its electric charge, or other factors.
A) Sonar
B) Radar
C) LiDAR
D) Barometer
Correct Answer: A) Sonar
Explanation: Sonar (Sound Navigation and Ranging) is a technique that uses sound propagation (usually underwater, as in submarine navigation) to navigate, communicate with or detect objects on or under the surface of the water, such as other vessels.
A) Melting point
B) Freezing point
C) Boiling point
D) Flash point
Correct Answer: C) Boiling point
Explanation: The boiling point of a substance is the temperature at which the vapor pressure of the liquid equals the external pressure surrounding the liquid.
A) Newton’s first law of motion
B) Newton’s second law of motion
C) Newton’s third law of motion
D) Hooke’s law
Correct Answer: C) Newton’s third law of motion
Explanation: Newton’s third law of motion states that for every action, there is an equal and opposite reaction. This means that in every interaction, there is a pair of forces acting on the two interacting objects.
A) Crest
B) Trough
C) Node
D) Antinode
Correct Answer: B) Trough
Explanation: The trough is the opposite of the crest, so it is the lowest point on a wave.
A) Resistor
B) Inductor
C) Capacitor
D) Transistor
Correct Answer: C) Capacitor
Explanation: A capacitor is a device that stores electrical energy in an electric field. It is a passive electronic component with two terminals.
A) Volt
B) Ampere
C) Coulomb
D) Ohm
Correct Answer: B) Ampere
Explanation: The ampere, often shortened to “amp,” is the base unit of electric current in the International System of Units. It is named after André-Marie Ampère, one of the main discoverers of electromagnetism.
A) Resonance
B) Harmonics
C) Interference
D) Beats
Correct Answer: A) Resonance
Explanation: Resonance occurs when the first object vibrates at the natural frequency of a second object, which causes the second object to vibrate at that frequency as well.
A) Solar eclipse
B) Lunar eclipse
C) Penumbral eclipse
D) Annular eclipse
Correct Answer: A) Solar eclipse
Explanation: A solar eclipse occurs when the Moon passes between Earth and the Sun, thereby totally or partly obscuring the image of the Sun for a viewer on Earth.
A) Motor
B) Generator
C) Battery
D) Transformer
Correct Answer: A) Motor
Explanation: An electric motor converts electrical energy into mechanical energy. The reverse process, that of converting mechanical energy into electrical energy, is accomplished by a generator or dynamo.
A) Radioactive decay
B) Nuclear fission
C) Nuclear fusion
D) Alpha decay
Correct Answer: A) Radioactive decay
Explanation: Radioactive decay is the process by which an unstable atomic nucleus loses energy by emitting radiation, such as an alpha particle, beta particle with a neutrino or only a neutrino in the case of electron capture, or a gamma ray or electron in the case of internal conversion.
A) Charles’s Law
B) Boyle’s Law
C) Avogadro’s Law
D) Dalton’s Law
Correct Answer: A) Charles’s Law
Explanation: Charles’s Law states that if the pressure of a gas is held constant, its volume is directly proportional to the absolute temperature.
A) Projectile motion
B) Orbital motion
C) Free fall
D) Uniform motion
Correct Answer: C) Free fall
Explanation: Free fall is the motion of a body where gravity is the only force acting upon it, as in the case of an object falling in a vacuum with no air resistance.
A) Sound wave
B) Seismic wave
C) Water wave
D) Electromagnetic wave
Correct Answer: D) Electromagnetic wave
Explanation: Electromagnetic waves do not require a medium to travel through and can propagate through the vacuum of space.
A) Direct current (DC)
B) Alternating current (AC)
C) Pulsating current
D) Static current
Correct Answer: B) Alternating current (AC)
Explanation: Alternating current (AC) is the form of electric current that periodically reverses direction, whereas direct current (DC) flows only in one direction.
A) Graham’s law of effusion
B) Charles’s law
C) Boyle’s law
D) Avogadro’s law
Correct Answer: A) Graham’s law of effusion
Explanation: Graham’s law states that the rate of effusion or of diffusion of a gas is inversely proportional to the square root of the mass of its particles.
A) Frequency
B) Amplitude
C) Wavelength
D) Wave speed
Correct Answer: C) Wavelength
Explanation: Wavelength is the distance between identical points (adjacent crests) in the adjacent cycles of a waveform signal propagated in space or along a wire.
A) Covalent bond
B) Ionic bond
C) Metallic bond
D) Hydrogen bond
Correct Answer: B) Ionic bond
Explanation: An ionic bond is a type of chemical bond that involves the electrostatic attraction between oppositely charged ions, and is one of the main types of bonding along with covalent bonding.
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