Atoms and Nuclei (KVPY Stream-SA (Class 11) Physics): Questions 1 - 5 of 15

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Question number: 1

» Atoms and Nuclei » Radioactive Decay Law

Appeared in Year: 2009

MCQ▾

Question

U92235 atom disintegrates to Pb82207 with a half-life of 10 9 years. In the process it emits & alpha particles and n β - particles. Here n is

Choices

Choice (4) Response

a.

3

b.

7

c.

4

d.

14

Question number: 2

» Atoms and Nuclei » Atomic Masses

Appeared in Year: 2011

MCQ▾

Question

A nucleus of lead Pb82214 emits two electrons followed by an alpha particle. The resulting nucleus will have

Choices

Choice (4) Response

a.

80 protons and 130 neutrons

b.

78 protons and 134 neutrons

c.

82 protons and 130 neutrons

d.

82 protons and 128 neutrons

Question number: 3

» Atoms and Nuclei » Radioactive Decay Law

MCQ▾

Question

89227Ac atom disintegrates to 82207Pb by emitting 5 alpha particle and n electrons. Here n is:

Choices

Choice (4) Response

a.

6

b.

7

c.

3

d.

10

Question number: 4

» Atoms and Nuclei » Rutherford's Model of Atom

Appeared in Year: 2012

MCQ▾

Question

Which statement about the Rutherford model of the atom is NOT true?

Choices

Choice (4) Response

a.

Nearly all the mass of an atom resides in the nucleus

b.

Electrons occupy the space surrounding the nucleus

c.

There is a positively charged centre in an atom called the nucleus

d.

Size of the nucleus is comparable to the atom

Question number: 5

» Atoms and Nuclei » Radioactive Decay Law

Appeared in Year: 2012

MCQ▾

Question

92238U atom disintegrates to 84214Po with a half-life of 4.5×109 years by emitting six alpha particle and n electrons. Here n is:

Choices

Choice (4) Response

a.

6

b.

10

c.

4

d.

7

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