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General Physical Geography Test 50

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General Physical Geography Test 50
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Which of the following statements is incorrect about Milky Way?
    Solution
    • About 90 percent of the mass in the Milky Way’s gravitational field is made up of dark matter, so the luminous stars gas, and dust of the galaxy are embedded at the center of a huge, roughly spherical dark matter halo more than a million light-years across. There is an object at the center of the Milky Way called Sagittarius A-star which emits much more X-rays and radio waves than expected for a star sized body. 
    • Much of the Milky way galaxy is blocked from our view on Earth due to the barriers created by dusty gas clouds blocking much of the light. Using infrared, microwave, and radio astronomy techniques, it is possible to penetrate much of this dusty fog. However, that too allows us only detect only half of the stars and gas.
  • Question 2
    1 / -0
    It is the largest explosion of stars that takes place in space. It is difficult to see in our own Milky Way galaxy due to dust which blocks our view. It was last discovered by Johannes Kepler in 1604. What are we talking about?
    Solution
    • A supernova is an explosion of a massive supergiant star. It may shine with a brightness of 10 billion suns. It can briefly outshine entire galaxies and radiate more energy than our sun will in its entire lifetime. They're also the primary source of heavy elements like iron in the universe. 
    • According to NASA, supernovae are "the largest explosion that takes place in space.
  • Question 3
    1 / -0
    Which of the following statements is incorrect about Jupiter?
    Solution
    • Fifth in line from the Sun, Jupiter is, by far, the largest planet in the solar system, more than twice as massive as all the other planets combined.
    • Jupiter's Great Red Spot is a gigantic storm that’s about twice the size of Earth and has raged for over a century. 
    • Jupiter is a gas giant and its atmosphere is made up mostly of hydrogen (H2) and helium (He).

    • Jupiter has 4 sets of rings made up of dust and small pieces of rocks.

  • Question 4
    1 / -0
    Which among the following is the nearest major galaxy to the Milky Way?
    Solution
    The Andromeda Galaxy, also known as Messier 31 or M31, is a spiral galaxy located about 2.5 million light-years from Earth. Located in the Andromeda constellation, it is the closest spiral galaxy to the Milky Way, where our solar system is. It is also the largest galaxy of what is called the Local Group which is a collection of more than 54 galaxies including the Milky Way.
  • Question 5
    1 / -0
    Pluto is having five known moons. Charon is its largest moon having the diameter equal to _____.
    Solution
    • Pluto, the dwarf planet that was once considered the ninth planet, has a growing entourage of satellites. The tiny world has five moons of varying size in orbit around it that tumble and dance in a strange and chaotic pattern. 
    • Pluto has one very large moon that is almost half the planet’s size. It was named Charon and the huge size of Charon (1,200 kms in diameter as compared to Pluto's diameter of 2370 kms) sometimes leads scientists to refer to Pluto and Charon as a double dwarf planet
  • Question 6
    1 / -0
    Each planet in the solar system has seasons. On which of the following planets the length of each season is of about 3 years?
    Solution
    • Every planet in our solar system has seasons. There are several factors that affect the weather on the planets viz. the tilt of a planet's axis (which causes the seasons), the shape of its orbit around the sun, the presence or absence of a significant atmosphere, etc. 
    • Jupiter has an axial tilt of only 3 degrees, compared to 23 degrees tilt of the Earth. So there is literally no difference between the seasons. Moreover, because of its distance from the sun, seasons change more slowly. Thus, the length of each season is roughly three years.
  • Question 7
    1 / -0
    Sharks are killers of the deep seas. Which of the following is a characteristic of sharks?
    Solution
    Cartilaginous fish are fish that have a skeleton made of cartilage, rather than bone. Cartilaginous fish include sharks, rays, skates and chimaeras. The cartilages are tough and flexible and provides enough structural support to allow these fish to grow to very large sizes.
  • Question 8
    1 / -0
    Stars are enormous Spheres of ignited gas that light the cosmos. They come in many different types and sizes. Which among the following is not a known type of stars?
    Solution
    • White dwarf- When a star has completely run out of hydrogen fuel in its core and it lacks the mass to force higher elements into fusion reaction, it becomes a white dwarf star. 
    • Red dwarf- Red dwarf stars are the most common kind of stars in the Universe. These are main sequence stars but they have such low mass that they’re much cooler than stars like our Sun. The smallest red dwarfs are 0.075 times the mass of the Sun, and they can have a mass of up to half of the Sun.
    • Red giant- A red giant is a star that is past its peak and has consumed its core's supply of hydrogen fuel. As a result, helium has built up in the core, hydrogen has fused in the outer shells, and the star has expanded into a giant red monstrosity.
  • Question 9
    1 / -0
    What percent of the Earth's water is found in the atmosphere?
    Solution

    • The ocean holds about 97 percent of the Earth's water; the remaining three percent is distributed in many different places, including glaciers and ice, below the ground, in rivers and lakes, and in the atmosphere. 
    • At any given time only about 0.001 percent of Earth's water is in the form of atmospheric vapour, a surprisingly small number given its crucial role in weather.

  • Question 10
    1 / -0
    Water boils at a lower temperature on the hills because _______________.
    Solution
    • The boiling point of water is lower at higher altitudes due to the decreased atmospheric pressure.
    • A liquid boils when its vapour pressure exceeds the local total pressure. At high altitudes the local air pressure is lower than it is at sea level.
    • Thus, the lower pressure allows the liquid to boil at a lower temperature.
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