Form 4 Phys - Term 1 quiz 1

What is radioactive decay?

• The spontaneous breakdown of an atomic nucleus resulting in only energy release
• The spontaneous breakdown of an atomic nucleus resulting in only matter release
• The spontaneous breakdown of an atomic nucleus resulting in a release of energy and matter
• The decay of the use of radios and the increased use of televisions.

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NGSS.HS-PS1-8

When does radioactive decay occur?

• When the nucleus of an isotope is unstable
• When the nucleus of an isotope is stable
• When the electrons of an isotope are spinning
• When the electrons of an isotope are shared with another isotope

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NGSS.HS-PS1-8

What is the definition of an isotope?

• An atom with different electron number to proton number
• An atom with different proton number from neutron number
• An atom with different number of protons from the periodic table
• An atom with a different number of neutrons from the periodic table

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NGSS.HS-PS1-8

If there are 146 neutrons in ²³⁸U, how many neutrons

are found in the nucleus of ²³⁵U?

• 141

• 143

• 145

• 147

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NGSS.HS-PS1-8

How many protons does gold atom have?

• 197
• 79
• 118
• 276

If radiation is detected through paper, which 2 types could it be?

• Alpha & beta
• Beta & gamma
• Alpha & gamma

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NGSS.HS-PS1-8

Which of these are FALSE about nucleons?

• Nucleons are subatomic particles.

• Nucleons are located in the nucleus of an atom.

• Protons or neutrons are nucleons.

• Nucleons are has negative electric charge.

Who first discovered neutron?

• Ernest Rutherford

• Sir James Chadwick

• Neils Bohr

• J. J. Thompson

The number of nucleons (neutrons and protons) in the nucleus tells you

• which isotope it is
• which element it is
• which atom it is
• which molecule it is

Who first discovered proton?

• Ernest Rutherford

• Sir James Chadwick

• Neils Bohr

• J. J. Thompson