441. Which planet is considered as the Dwarf planet?

1. Earth
2. Jupiter
3. Pluto
4. Saturn

Option “3” is correct.
A dwarf planet is a planetary-mass object that is neither a planet nor a natural satellite. That is, it is in direct orbit of a star, and is massive enough for its gravity to crush it into a hydrostatically equilibrious shape (usually a spheroid), but has not cleared the neighborhood of other material around its orbit.The International Astronomical Union (IAU) currently recognizes five dwarf planets: Ceres; Pluto; Haumea; Makemake; and Eris.
442. The Indian State of Sikkim does not share a border with which neighbouring country?

1. Nepal
2. Bangladesh
3. Bhutan
4. China

Option “2” is correct.
The Indian State of Sikkim shares its border with three neighbouring countries Bhutan, China (Tibet) and Nepal.
443. How many states does India have as of June 2017?

1. 26
2. 27
3. 28
4. 29

Option “4” is correct.
India has 29 states on June 2017.
444. “Saptarishi” is the Indian name of which Constellation?

1. Draco
2. Orion
3. Ursa Minor
4. Ursa Major

Option “4” is correct.
The Saptarishi are the seven rishis who are extolled at many places in the Vedas and Hindu literature. The names of the current Saptarshis are: Kashyapa, Atri, Vasistha, Vishvamitra, Gautama Maharishi, Jamadagni and Bharadvaja. It is Indian name of Ursa Major.
445. Marble is the metamorphosed form of-

1. Shale
2. Basalt
3. Sandstone
4. Limestone

Option “4” is correct.
Marble is a metamorphic rock that developed from limestone. Most of the material is calcite (a crystalline form of calcium carbonate, CaCO3) and dolomite. It is often used for sculpture, as a building material, and for many other purposes.
446. Trade winds blow from the-

1. Equatorial low pressure
2. Polar high pressure
3. Subtropical high pressure
4. Sub polar low pressure

Option “3” is correct.
The surface air that flows from these subtropical high-pressure belts toward the Equator is deflected toward the west in both hemispheres by the Coriolis Effect. These winds blow predominantly from the northeast in the Northern Hemisphere and from the southeast in the Southern Hemisphere.
447. Which are the main gases present in Sun?

1. Hydrogen and Carbon Dioxide
2. Argon and Helium
3. Hydrogen and Argon
4. Hydrogen and Helium

Option “4” is correct.
The Sun is a big ball of gas and plasma. Most of the gas is hydrogen or helium, but there are also small amounts of other elements such as oxygen, carbon, nitrogen, magnesium and iron.
448. The cyclone that brought devastation in Bangladesh in 2017 is named as-

1. Shary
2. Sidr
3. Wendy
4. Mora

Option “4” is correct.
Cyclone Mora was a tropical cyclone that caused widespread devastation and severe flooding in Sri Lanka, Andaman and Nicobar Islands, Bangladesh, Myanmar and Northeast India in May 2017.
449. Which is the most stable ecosystem?

1. Desert
2. Ocean
3. Mountain
4. Forest

Option “2” is correct.
A stable ecosystem is the ecosystem in which the structure and function remain unaltered over a long period of time. Oceans are considered to be the most stable ecosystem in nature.
450. All vital atmospheric processes leading to various climatic and weather conditions take place in the :

1. Stratosphere
2. Troposphere
3. Ionosphere
4. Exosphere

Option “2” is correct.
The troposphere is the lowest portion of Earth’s atmosphere, and is also where nearly all weather process takes place.
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