20. El Niño is a climate cycle in the Pacific Ocean with a global impact on weather patterns. In the
Philippines, several factors determine when El Niño arrives. Which of the following includes the
effect of El Nino?
A) Delayed start of the rainy season
C) Early termination of the rainy season
B) Tropical cyclone activity
D) All of the above
21. The primary greenhouse gases in Earth's atmosphere are water vapor, carbon dioxide, methane,
nitrous oxide and ozone. Without greenhouse gases, the average temperature of Earth's surface will
increase. What greenhouse gases do?
A) It absorb Earth's outgoing infrared photons C) It reflect Earth's incoming infrared photons
B) It blocks the Sun's infrared radiation D) It magnifies ultraviolet radiation in the atmosphere
22. Global warming is the current increase in temperature of the Earth's surface as well as its atmosphere.
Over the last 100 years, average temperatures around the world have raised by 0.75°C, about two
thirds of this increase has occurred since 1975. Which of the following statements is NOT the effect
of Global Warming?
A) Polar ice caps will melt.
B) Coastal regions will be covered with rising sea levels.
C) Some areas will experience serious droughts
D) The Earth's rotation will slow down and eventually stop
23. The constellation Pisces changes position during night. Which motion is mainly responsible for this
change in position?
A) Revolution of Earth around the Sun
C) Rotation of Earth around the Sun
B) Revolution of Pisces around the Sun
D) Rotation of Pisces on its axis
24. Which constellation helps sailors to navigate at the sea?
A) Pisces
B) Sagittarius
C) Polaris
D)Ursa Minor
25. Different star patterns are seen at different times of the year because of
A) Earth's rotation
B) Coriolis Effect
C) Earth's revolution
D) Tyndall Effect​