Structure of Atoms NDA Questions

NDA Chemistry

Structure of Atoms MCQ Questions


13.
According to Thomson's model of the atom, the mass of the atom is assumed to be:
A.
Concentrated only on the electrons
B.
Concentrated only at the centre
C.
Located outside the atom
D.
Uniformly distributed throughout the atom
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ANSWER :
D. Uniformly distributed throughout the atom
14.
Which of the following statements about Thomson's model of the atom is correct?
A.
The entire mass of the atom is concentrated in a tiny nucleus
B.
Electrons revolve around the nucleus in fixed circular orbits
C.
The positive and negative charges in an atom are equal in magnitude, making it electrically neutral
D.
Most of the space inside an atom is empty
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ANSWER :
C. The positive and negative charges in an atom are equal in magnitude, making it electrically neutral
15.
In Rutherford's alpha-particle scattering experiment, a thin sheet of which metal was used?
A.
Silver
B.
Aluminium
C.
Copper
D.
Gold
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ANSWER :
D. Gold
16.
In Rutherford's scattering experiment, most of the fast-moving alpha particles passed straight through the gold foil. This observation suggests that:
A.
The atom is a solid sphere with no empty space
B.
Alpha particles have no mass
C.
Most of the space inside the atom is empty
D.
The nucleus occupies most of the volume of the atom
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ANSWER :
C. Most of the space inside the atom is empty
17.
In Rutherford's alpha-scattering experiment, a very small fraction of alpha particles bounced back at nearly 180°. This indicated that:
A.
The atom has no positive charge at all
B.
All the positive charge and most of the mass of the atom were concentrated in a very small volume
C.
Electrons are present at the centre of the atom
D.
The atom is uniformly charged throughout
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ANSWER :
B. All the positive charge and most of the mass of the atom were concentrated in a very small volume
18.
In Rutherford's scattering experiment, about how many alpha particles out of every 12000 got deflected by nearly 180°?
A.
100
B.
1000
C.
1
D.
6000
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ANSWER :
C. 1