Atoms and Nuclei-Isotopes (KVPY Stream-SA (Class 11) Physics): Questions 1 - 2 of 2

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Question number: 1

» Atoms and Nuclei » Isotopes

Appeared in Year: 2014

MCQ▾

Question

Consider the following statements. The correct statement regarding an isotope is,

(i) All isotopes of an element have the same number of neutrons

(ii) Only one isotope of an element can be stable and non-radioactive

(iii) All elements have isotopes

(iv) All isotopes of Carbon can form chemical compounds with Oxygen-16

Select any one of following,

Choices

Choice (4) Response

a.

(ii) and (iv) are correct

b.

(i), (ii) and (iii) are correct

c.

(iii) and (iv) are correct

d.

(i) and (iii) are correct

Question number: 2

» Atoms and Nuclei » Isotopes

MCQ▾

Question

The isotopes 238U and 235U occur in nature in the ratio 150: 1. Assuming that at the time of earth formation they were present in equal amount; make an estimation of the age of the earth. The half-lives of 238U and 235U are 5.7×109yr and 6.3×108yr respectively.

[log10150=2.1761&log102=0.3010]

Choices

Choice (4) Response

a.

5.12×108years

b.

4.78×108years

c.

5.12×109years

d.

4.78×109years

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