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
B. hypothalamus
Explanation
hypothalamus is the correct answer. Review the question and compare it with the other choices to remember this fact for future exams.
Correct answer
D. Troposphere
Explanation
Troposphere is the correct answer. Review the question and compare it with the other choices to remember this fact for future exams.
Correct answer
A. aluminium oxide
Explanation
aluminium oxide is the correct answer. Review the question and compare it with the other choices to remember this fact for future exams.
Correct answer
D. 22
Explanation
The human skull is generally considered to consist of twenty-two bones—eight cranial bones and fourteen facial skeleton bones. In the neurocranium these are the occipital bone, two temporal bones, two parietal bones, the sphenoid, ethmoid and frontal bones.
Correct answer
A. oxygen and acetylene
Explanation
oxygen and acetylene is the correct answer. Review the question and compare it with the other choices to remember this fact for future exams.
Correct answer
C. radio waves on it
Explanation
Radar, which stands for radio detection and ranging, is a system that uses reflected radio waves to detect objects and measure their distance and speed. For example, police use radar to calculate the speed of cars.
Correct answer
A. Rutherford
Explanation
Ernest Rutherford discovered the nucleus of an atom in 1911: Ernest Rutherford Known for: Discovering the nucleus of the atom, discovering alpha and beta rays, and proposing the laws of radioactive decay Experiment Shot alpha particles at a sheet of gold foil, and noticed that most went through, but some bounced Discovery: The atom consists mostly of empty space, with its mass concentrated in a central positively charged nucleus Rutherford’s discovery was based on the observation that most alpha particles passed straight through the gold foil, with very few particles suffering deflection. The term “nucleus” comes from the Latin word nucleus, which is a diminutive of nux (“nut”). In 1844, Michael Faraday used the term to refer to the “central point of an atom”.
Correct answer
B. it has large eyes with orbs directed forward, giving it binocular sight
Explanation
Because of their eyes, an owl can see much better in the dark than we can. Owls have very large eyes which maximize light gathering in conditions of minimum light, thereby enabling them to see at night. The orbs of their eyes are directed forward, giving them binocular vision. They are able to see their prey in a three-dimensional manner. However, an owl’s eye cannot rotate.
Correct answer
D. Fall back to Earth
Explanation
Fall back to Earth is the correct answer. Review the question and compare it with the other choices to remember this fact for future exams.
Correct answer
A. 18
Explanation
The modern periodic table was created by Mosley. There are 7 horizontal rows which are called periods. They are also called series. Also, the modern periodic table consists of 18 vertical columns which are called groups.