Atoms and Nuclei (KVPY (Kishore Vaigyanik Protsahan Yojana) Stream-SA (Class 11) Physics): Questions 1 - 6 of 15

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Question number: 1

» Atoms and Nuclei » Radioactive Decay Law

Appeared in Year: 2009

MCQ▾

Question

atom disintegrates to 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 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

atom disintegrates to 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

atom disintegrates to 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

Question number: 6

» Atoms and Nuclei » Isobars

MCQ▾

Question

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

(i) Isobars are chemically different but physically same.

(ii) Isobars are atoms of different elements.

(iii) Numbers of electrons in isobars are different

(iv) The atomic numbers are same in isobars.

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

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