Kuiz Fizik Tingkatan 5 Bab 6 Set 1

SELAMAT DATANG Kuiz Fizik Tingkatan 5 Bab 6 Set 1

KUIZ INI MENGANDUNGI 10 SOALAN

What is the fundamental process that defines radioactive decay?

A heavy nucleus splits into two or more lighter nuclei when struck by a neutron.

A stable nucleus absorbs external energy and becomes unstable.

Two light nuclei combine under high pressure to form a heavier nucleus.

An unstable nucleus transforms into a more stable one by emitting radiation.

None

What happens to the atomic nucleus during gamma decay?

It splits into two smaller nuclei.

A neutron transforms into a proton and an electron.

It emits two protons and two neutrons.

It transitions from a higher energy state to a lower energy state without changing its composition.

None

In the equation E=mc2, what does the 'c' represent?

The speed of light in a vacuum.

The rate of radioactive decay.

The charge of an electron.

The mass of a carbon-12 atom.

None

If a sample of a radioactive isotope has a half-life of 20 days, what fraction of the original sample will remain undecayed after 60 days?

1/16

1/2

1/4

1/8

None

Why is the method of dating rocks using the Uranium-238 to Lead-206 decay series effective for estimating the age of the Earth?

Uranium-238 has a very short half-life, allowing for precise measurements.

Lead-206 is a highly radioactive element that decays quickly.

Uranium-238 has a very long half-life, comparable to the age of the Earth.

The decay process is heavily influenced by temperature and pressure within the Earth’s crust.

None

Which of the following describes a nuclear chain reaction?

A series of alpha and beta decays that occur until a stable nucleus is formed.

A chemical reaction where the products catalyze the next stage of the reaction.

The fusion of multiple hydrogen nuclei in a sequential manner within a star.

A self-sustaining process where neutrons released in one fission event trigger further fission events.

None

A radioactive substance has a half-life of 15 minutes. If you start with a sample of this substance, what fraction of the original radioactive nuclei will remain undecayed after one hour?

1/2

1/16

1/4

1/8

None

What is the primary function of control rods, made of materials like boron or cadmium, inside a nuclear reactor?

To transfer heat from the reactor core to the steam generator

To slow down fast-moving neutrons to increase the probability of fission.

To act as the fuel source for the fission process

To absorb excess neutrons to regulate the rate of the chain reaction.

None

During beta decay, a neutron in an unstable nucleus transforms. What is the effect on the nucleon number (A) and the proton number (Z) of the nucleus?

The nucleon number (A) decreases by four, and the proton number (Z) decreases by two.

The nucleon number (A) decreases by one, while the proton number (Z) remains the same.

Both the nucleon number (A) and the proton number (Z) remain unchanged.

The nucleon number (A) remains the same, while the proton number (Z) increases by one.

None

10.

In the context of a nuclear reactor, what is the primary function of control rods made of boron or cadmium?

To act as the nuclear fuel that undergoes fission.

To slow down fast-moving neutrons to increase the probability of fission.

To absorb excess neutrons and regulate the rate of the chain reaction.

To transfer heat from the reactor core to the steam generator.

None

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