NSO Level 1- Science Olympiad (SOF) Class 10: Questions 468 - 471 of 986
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Question 468
Question
MCQ▾Genetic drift is defined as
Choices
| Choice (4) | Response | |
|---|---|---|
a. | A product of natural selection | |
b. | A change in gene frequencies due to exchange of genes between different populations | |
c. | A change in allele due to alternation in the DNA molecule | |
d. | Any change in the allelic frequencies in a population that result from chance | |
Question 469
Question
MCQ▾The group of elements is placed in Mendeleev՚s periodic table without disturbing the original order. Group of elements is
Choices
| Choice (4) | Response | |
|---|---|---|
a. | Alkali Group | |
b. | Transition Group | |
c. | Noble Group | |
d. | None of the above | |
Question 470
Question
MCQ▾Merit/ (s) of Mendeleev՚s periodic table is/are:
Choices
| Choice (4) | Response | |
|---|---|---|
a. | Mendeleev left some gap for new elements, which were not discovered at that time. | |
b. | At some places, the order of atomic weight was changed in order to justify the chemical and physical nature. | |
c. | One of the strengths of Mendeleev՚s periodic table was that, when inert gases were discovered they could be placed in a new group without disturbing the existing order. | |
d. | All a., b. and c. are correct | |
Question 471
Question
MCQ▾Which of the following do not belong to same group?
Choices
| Choice (4) | Response | |
|---|---|---|
a. | Ca, Sc, Ti | |
b. | Al, Ga, In | |
c. | Y, Lu, Lr | |
d. | Sr, Ba, Ra | |