1. On which of the following dates is Australia likely to experience the shortest day of the year?
- 21 June
- 21 March
- 22 September
- 22 December
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Answer: 21 June
The June solstice is the Summer Solstice in the Northern Hemisphere and the Winter Solstice in the Southern Hemisphere. Similarly, the December Solstice or Summer solstice in the Southern Hemisphere is on 21 December. Australia will experience the longest day on 22 December and the shortest day on 21 June.
2. Seasons on Earth are caused due to ______?
- Earth’s rotation
- Earth’s axial tilt on its axis
- Earth’s axial tilt and its rotation on its axis
- Earth’s axial tilt and its revolution around the Sun
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Answer: Earth’s axial tilt and its revolution around the Sun
The fourth option is the correct answer. Earth’s axial tilt is around 23.44 degrees.
3. If the earth stops rotating, the impact on the weight of a body will be minimum on which among the following places?
- Equator
- North Pole
- Tropic of Cancer
- Tropic of Capricorn
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Answer: North Pole
The question is related to the centrifugal forces, which represent the effects of inertia that arise in connection with rotation and which are experienced as an outward force away from the centre of rotation. The impact of this force is maximum at the Equator and minimum at the Pole.
4. What else is 180-degree longitude is also known as?
- Arctic Circle
- International Date Line
- The Great Circle
- Equator
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Answer: International Date Line
The 180th meridian or antimeridian is the Prime Meridian. It is known as the International Date Line. It is with which it forms a great circle dividing the earth into the Western and Eastern Hemispheres. It is common to both east longitude and west longitude.
5. Which line marks the boundary of the zone where the Sun never sets during June solstice and never rises during December Solstice?
- Antarctic Circle
- Arctic Circle
- Tropic of Cancer
- Tropic of Capricorn
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Answer: Arctic Circle
The Arctic Circle is an imaginary line around the Arctic. It’s defined as the latitude above which the Sun does not set on the day of the summer solstice and never rises during the December Solstice. This is because the Arctic and Antarctic circle have sunlight for 6 months continuously.
6. What is the distance between consecutive longitudes at poles?
- 0 km
- 10 km
- 15 km
- 20 km
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Answer: 0 km
The distance between two consecutive longitudes (91 degrees E and 92 degrees E) at the Poles is 0 km. The distance between two consecutive meridians of longitude is equal to 111 km only at the equator. The distance between two consecutive parallels of latitude is equal to about 111 km.
7. What is the name of Earth’s first supercontinent?
- Pangea
- Vaalbara
- Gondwana
- Columbia
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Answer: Pangea
Pangea, also spelled Pangaea, in early geologic time, a supercontinent that incorporated almost all the landmasses on Earth.
8. If Earth stops rotating, the impact on the weight of a body will be minimum on which among the following places?
- Equator
- North pole
- Tropic of Cancer
- Tropic of Capricorn
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Answer: North pole
If the Earth stops rotating, then the impact of the weight of a body will be minimum at the Poles. The maximum weight will be at the Equator. If the Earth stops rotating, then there would be no centrifugal force whose direction is away from the core. Thus, the force due to gravity is not minimised at all, and this, in turn, increases an object’s weight at the Equator.
9. What is the amount of Iron on Earth (percentage in total mass)?
- 24.5%
- 34.6%
- 39.3%
- 42.4%
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Answer: 34.6%
The iron makes up about 34.6% of Earth’s mass and 5.2% of Earth’s crust. The other metals present are aluminium, silicon, etc. The abundant metal Iron is truly one of Earth’s essential building blocks.
10. What is the radius of Earth?
- 5300 km
- 6370 km
- 10000 km
- 8330 km
Show Answer
Answer: 6370 km
Approximate distance from Earth’s centre to its surface is known as Earth’s radius, which is 6,370 km.
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