Correct Answer: B) Microscope
Explanation: A microscope is an optical instrument used to view small objects in great detail, producing a magnified image through lenses or a combination of lenses.
A) Solar winds interacting with the Earth’s magnetosphere
B) Moonlight reflecting off of ice crystals in the atmosphere
C) Sunlight refracting through the Earth’s atmosphere at the poles
D) Meteor particles burning up in the Earth’s atmosphere
Correct Answer: A) Solar winds interacting with the Earth’s magnetosphere
Explanation: Auroras, or the Northern and Southern Lights, occur when charged particles from the solar wind interact with the Earth’s magnetic field, causing the particles to glow as they collide with atoms in the Earth’s atmosphere.
A) Telescope
B) Microscope
C) Periscope
D) Kaleidoscope
Correct Answer: B) Microscope
Explanation: A microscope is an optical instrument used to view small objects in great detail, producing a magnified image through lenses or a combination of lenses.
A) Transverse
B) Longitudinal
C) Electromagnetic
D) Gravitational
Correct Answer: B) Longitudinal
Explanation: Sound waves are longitudinal waves where the particle displacement is parallel to the direction of wave propagation.
A) The Sun
B) The Moon
C) The Earth’s rotating core
D) Cosmic radiation
Correct Answer: C) The Earth’s rotating core
Explanation: Earth’s magnetic field is primarily generated by electric currents in the planet’s molten outer core, which is composed of conducting materials such as iron and nickel.
A) The Doppler Effect
B) The Compton Effect
C) The Diffraction Effect
D) The Photoelectric Effect
Correct Answer: C) The Diffraction Effect
Explanation: Diffraction occurs when a wave encounters an obstacle or a slit that is comparable in size to its wavelength, which causes the wave to bend around the obstacle or through the slit.
A) The Doppler Effect
B) The Compton Effect
C) The Diffraction Effect
D) The Photoelectric Effect
Correct Answer: A) The Doppler Effect
Explanation: The Doppler Effect is the change in frequency of a wave in relation to an observer who is moving relative to the wave source. It is commonly heard in the change of pitch of a siren as it moves towards or away from an observer.
A) Evaporation
B) Condensation
C) Deposition
D) Sublimation
Correct Answer: A) Evaporation
Explanation: Evaporation is the process where molecules at the surface of a liquid absorb enough energy to change into the gaseous state below the boiling point, occurring throughout the bulk of the liquid.
A) Archimedes’ Principle
B) Bernoulli’s Principle
C) Pascal’s Principle
D) Joule’s Law
Correct Answer: B) Bernoulli’s Principle
Explanation: Bernoulli’s Principle states that for an inviscid flow, an increase in the speed of the fluid occurs simultaneously with a decrease in pressure or a decrease in the fluid’s potential energy.
A) Curie
B) Rutherford
C) Becquerel
D) Newton
Correct Answer: C) Becquerel
Explanation: The becquerel is the SI derived unit used to measure the activity of a quantity of radioactive material, which is one disintegration per second.
A) Direct Current (DC)
B) Alternating Current (AC)
C) Pulsating Current
D) Static Current
Correct Answer: A) Direct Current (DC)
Explanation: Solar panels produce direct current (DC), where the electric charge flows in one direction. This DC can be converted to alternating current (AC) using an inverter for household or commercial use.
A) Reflection
B) Refraction
C) Diffusion
D) Dispersion
Correct Answer: C) Diffusion
Explanation: Diffusion of light occurs when light is scattered in many directions as it passes through a medium. This is due to the interactions of light with particles and imperfections within the medium.
A) Sublimation
B) Deposition
C) Condensation
D) Evaporation
Correct Answer: B) Deposition
Explanation: Deposition is the phase transition in which gas transforms into solid without passing through the liquid phase. This process is the reverse of sublimation.
A) Ohm’s Law
B) Kirchhoff’s Current Law
C) Kirchhoff’s Voltage Law
D) Faraday’s Law of Electromagnetic Induction
Correct Answer: B) Kirchhoff’s Current Law
Explanation: Kirchhoff’s Current Law states that the total current entering a junction or node in a circuit must equal the total current leaving the node, as charge cannot accumulate at the node.
A) It doubles
B) It quadruples
C) It halves
D) It stays the same
Correct Answer: B) It quadruples
Explanation: According to the combined gas law (P1V1/T1 = P2V2/T2), if the volume is halved and the temperature is doubled, the pressure of the gas quadruples.
A) Trough
B) Crest
C) Amplitude
D) Wavelength
Correct Answer: A) Trough
Explanation: The trough is the lowest point of a wave, the point where the displacement of the medium is at its lowest.
A) Amplitude
B) Frequency
C) Wavelength
D) Velocity
Correct Answer: C) Wavelength
Explanation: Wavelength is the distance between successive crests (or troughs) of a wave. It is a key characteristic of both sound and electromagnetic waves.
A) Ammeter
B) Voltmeter
C) Ohmmeter
D) Galvanometer
Correct Answer: C) Ohmmeter
Explanation: An ohmmeter is used to measure electrical resistance, which is the opposition to the flow of an electric current.
A) Fission
B) Fusion
C) Radioactive decay
D) Catalysis
Correct Answer: C) Radioactive decay
Explanation: Radioactive decay is the process by which an unstable atomic nucleus loses energy by emitting radiation, which may include alpha particles, beta particles, or gamma rays.
A) Radio waves
B) Microwaves
C) Infrared waves
D) Gamma rays
Correct Answer: D) Gamma rays
Explanation: Gamma rays have the shortest wavelength and the highest energy of all electromagnetic waves in the electromagnetic spectrum.
A) Reflection
B) Refraction
C) Diffraction
D) Dispersion
Correct Answer: C) Diffraction
Explanation: Diffraction is the bending of waves around small obstacles and the spreading of waves past small openings. It is noticeable when the size of the obstacle or aperture is comparable to the wavelength of the wave.
& stay ahead of your competitors!
* Subscribe to our email newsletter to get the latest posts delivered right to your email.