Earth - Study Mode
[#191] What is the interval between a high tide and low tide at a given place?
Correct Answer
(B) 12 hours 26 minutes
Explanation
Solution: The difference between high tide & low tide at a given place is about 12 hrs. 26 min. Neap tides occur when the sun, earth and moon form a right angle and the gravitational pull of the sun counteracts the pull of the moon.
[#192] The longitudinal, transverse and surface waves in an earthquake originate from
Correct Answer
(A) The focus within the body of the earth
Explanation
Solution: The longitudinal, transverse and surface waves in an earthquake originate from The focus within the body of the earth. The point where the energy is released is called the focus of an earthquake, alternatively, it is called the hypocentre. The energy waves travelling in different directions reach the surface. The point on the surface, nearest to the focus, is called epicentre. It is the first one to experience the waves. It is a point directly above the focus.
[#193] ________ is the time taken by the Earth to return to a given point in its orbit with reference to a fixed star.
Correct Answer
(B) Sidereal year
Explanation
Solution: Because, for all intents and purposes, the sky is "fixed", a sidereal day is when the earth rotates 360°. A sidereal day is 23 hours 56 minutes and 4.09 seconds long. A sidereal year is the time it takes for the sun to return to the same position with respect to the stars.
[#194] Which of the following is/are true of world time zones? I. The world is divided into thirty time zones II. All time zones of the world are described in term of the number of hours difference between the standard meridian of that zone and the Greenwich Meridian III. All countries have more than one time zone IV. The time for all places east of Greenwich is designated slow, and time for all places left of Greenwich is designated fast
Correct Answer
(D) II only
Explanation
Solution: All time zones of the world are described in term of the number of hours difference between the standard meridian of that zone and the Greenwich Meridian. Each of Earth's 24 zones is one hour earlier then the one east of it, which equates to about 15° longitude for each. Although this is the general rule, there's not always a one hour difference between each time zone. Some countries have adopted a non-standard time, which may include a 30 or 45 minute offset.
[#195] Equator is
Correct Answer
(B) Imaginary line which rotates around the Earth
in the centre of north and south poles
Explanation
Solution: An equator of a rotating spheroid is its zeroth circle of latitude. It is the imaginary line on the spheroid's surface, equidistant from its poles, dividing it into northern and southern hemispheres.