CSS - PMS - CCE - PCS - General Science
Artificial Intelligence
What is unsupervised learning?
A. Learning only from labeled outputs
B. A CPU instruction
C. Learning patterns or structure from unlabeled data
D. A method of data encryption
Correct Answer: C
Unsupervised methods discover clusters, representations or structure without labeled targets.
CSS - PMS - CCE - PCS - General Science
Artificial Intelligence
What is supervised learning?
A. Learning from labeled examples
B. Learning only from rewards
C. Learning by replacing hardware
D. Learning with no data
Correct Answer: A
Supervised algorithms learn mappings from inputs to known target labels or values.
CSS - PMS - CCE - PCS - General Science
Artificial Intelligence
What is machine learning?
A. A network cable standard
B. A hardware cooling method
C. A subfield of AI in which systems learn patterns from data
D. Manual typing only
Correct Answer: C
Machine learning develops models that improve performance through data or experience.
CSS - PMS - CCE - PCS - General Science
Artificial Intelligence
What is artificial intelligence (AI)?
A. The field of creating systems that perform tasks associated with human intelligence
B. A type of computer cable
C. Only a database language
D. A mechanical power source
Correct Answer: A
AI studies algorithms and systems for perception, reasoning, learning, language and decision-making.
CSS - PMS - CCE - PCS - General Science
Eclipses
Why can the Moon appear reddish during a total lunar eclipse?
A. The Moon produces red light internally
B. The Moon becomes hotter than the Sun
C. Mars reflects light onto the Moon
D. Earth's atmosphere filters and refracts sunlight into the shadow
Correct Answer: D
Earth's atmosphere scatters shorter wavelengths and bends redder light toward the eclipsed Moon.
CSS - PMS - CCE - PCS - General Science
Eclipses
Is it safe to look directly at a partial solar eclipse without proper eye protection?
A. Only through a camera viewfinder
B. Only with sunglasses
C. No
D. Yes, always
Correct Answer: C
Direct solar viewing can cause severe retinal injury; certified solar viewing protection is required.
CSS - PMS - CCE - PCS - General Science
Eclipses
What is an annular solar eclipse?
A. A total eclipse caused by Earth
B. A solar flare
C. An eclipse in which the Moon appears too small to cover the Sun completely, leaving a bright ring
D. A lunar eclipse lasting a year
Correct Answer: C
When the Moon is farther from Earth, its apparent disk may not fully cover the Sun.
CSS - PMS - CCE - PCS - General Science
Eclipses
What is the penumbra?
A. A planet
B. A sunspot
C. The center of Earth
D. The lighter outer part of a shadow where the light source is only partly blocked
Correct Answer: D
Partial shadowing occurs in the penumbra.
CSS - PMS - CCE - PCS - General Science
Eclipses
What is the umbra?
A. The brightest part of a star
B. The Moon's surface
C. A type of orbit only
D. The darkest central part of a shadow where the light source is fully blocked
Correct Answer: D
Observers in the umbra can experience total eclipse conditions.
CSS - PMS - CCE - PCS - General Science
Eclipses
Why does an eclipse not occur every month?
A. Earth has no shadow
B. The Moon has no orbit
C. The Sun moves randomly
D. The Moon's orbital plane is tilted relative to Earth's orbital plane
Correct Answer: D
The Moon usually passes above or below the exact Sun-Earth alignment.
CSS - PMS - CCE - PCS - General Science
Eclipses
During which lunar phase can a lunar eclipse occur?
A. Full moon
B. New moon
C. Waxing crescent only
D. First quarter
Correct Answer: A
The Moon must be opposite the Sun in the sky at full phase.
CSS - PMS - CCE - PCS - General Science
Eclipses
During which lunar phase can a solar eclipse occur?
A. New moon
B. First quarter only
C. Third quarter only
D. Full moon
Correct Answer: A
The Moon must be near new phase to lie between Earth and Sun.
CSS - PMS - CCE - PCS - General Science
Eclipses
What causes a lunar eclipse?
A. The Moon stops reflecting light
B. Venus blocks the Moon
C. The Moon passes between Earth and Sun
D. Earth passes between the Sun and the Moon
Correct Answer: D
A lunar eclipse occurs when the Moon passes through Earth's shadow.
CSS - PMS - CCE - PCS - General Science
Eclipses
What causes a solar eclipse?
A. Mars blocks the Sun
B. The Moon passes between Earth and the Sun
C. The Sun turns off
D. Earth passes between Moon and Sun
Correct Answer: B
A solar eclipse occurs when the Moon's shadow falls on Earth.
CSS - PMS - CCE - PCS - General Science
Earthquakes
What is a tsunami?
A. A volcanic gas only
B. A series of long ocean waves often generated by undersea displacement such as an earthquake
C. Any wind wave
D. A type of drought
Correct Answer: B
Sudden displacement of large volumes of water can create tsunamis.
CSS - PMS - CCE - PCS - General Science
Earthquakes
What is intensity in earthquake science?
A. A measure of ocean depth
B. A measure of observed shaking and effects at a particular location
C. The earthquake's unique global size only
D. A chemical property
Correct Answer: B
Intensity varies from place to place depending on distance, geology and structures.
CSS - PMS - CCE - PCS - General Science
Earthquakes
What is magnitude in earthquake science?
A. Only the number of aftershocks
B. A daily weather index
C. A measure of local building color
D. A measure of earthquake size or released seismic energy
Correct Answer: D
Magnitude quantifies earthquake size based on seismic measurements.
CSS - PMS - CCE - PCS - General Science
Earthquakes
Most large earthquakes are associated with what geological feature?
A. Cloud boundaries
B. Magnetic north only
C. Tectonic plate boundaries and faults
D. Ocean salinity fronts
Correct Answer: C
Stress accumulates and is released along faults, especially at plate boundaries.
CSS - PMS - CCE - PCS - General Science
Earthquakes
Which seismic waves cannot travel through liquids?
A. Sound waves in air
B. P waves
C. S waves
D. Electromagnetic waves
Correct Answer: C
Shear S waves require a medium with shear rigidity and therefore do not propagate through liquids.
CSS - PMS - CCE - PCS - General Science
Earthquakes
Which seismic waves usually arrive first at a station?
A. Tidal waves
B. Surface waves
C. P waves
D. S waves
Correct Answer: C
Compressional P waves travel fastest through Earth.