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

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