MCQs
Read every question, see the correct answer, and understand the explanation at your own pace. Study mode has no timer and no negative marking.
Correct answer
D. Accumulation of salts in soil
Explanation
Accumulation of salts in soil is the correct answer. Review the question and compare it with the other choices to remember this fact for future exams.
Correct answer
B. Football
Explanation
Football is the correct answer. Review the question and compare it with the other choices to remember this fact for future exams.
Correct answer
C. Terrestrial Planets
Explanation
The planets Mercury, Venus, Earth, and Mars, are called terrestrial because they have a compact, rocky surface like Earth’s terra firma. The terrestrial planets are the four innermost planets in the solar system.
Correct answer
A. Lux
Explanation
Lux: The SI unit of illumination value; it is equal to one lumen per square metre.
Correct answer
B. Brightest
Explanation
Brightest is the correct answer. Review the question and compare it with the other choices to remember this fact for future exams.
Correct answer
C. Muscle endurance
Explanation
Muscle endurance is the correct answer. Review the question and compare it with the other choices to remember this fact for future exams.
Correct answer
B. August 24, 2006
Explanation
The International Astronomical Union (IAU) downgraded the status of Pluto to that of a dwarf planet because it did not meet the three criteria the IAU uses to define a full-sized planet. Essentially Pluto meets all the criteria except one- it “has not cleared its neighboring region of other objects.” In August 2006 the International Astronomical Union (IAU) downgraded the status of Pluto to that of “dwarf planet.”
Correct answer
A. 4.2 light years
Explanation
Proxima Centauri, the closest star to our own, is still 40,208,000,000,000 km away. (Or about 268,770 AU.) When we talk about the distances to the stars, we no longer use the AU, or Astronomical Unit; commonly, the light year is used. A light year is the distance light travels in one year – it is equal to 9.461 x 1012 km. Alpha Centauri A & B are roughly 4.35 light years away from us. Proxima Centauri is slightly closer at 4.25 light years.
Correct answer
A. Scatters blue light
Explanation
Scatters blue light is the correct answer. Review the question and compare it with the other choices to remember this fact for future exams.
Correct answer
A. Distance
Explanation
Distance is the correct answer. Review the question and compare it with the other choices to remember this fact for future exams.