PS Q3W1 Formation & Synthesis of Heavy Elements

Multiple Choice

What is the process by which stars release energy to counteract the effects of gravity?

• Radioactive decay

• Nuclear fusion

• Chemical reaction

• Nuclear fission

Multiple Choice

What is the name of the event that occurs when the core of a high-mass star collapses and triggers an explosion, ejecting heavy nuclei into space?

• Supernova

• White dwarf

• Planetary nebula

• Neutron star

Multiple Choice

What is the name of the object that is left behind when the core of a high-mass star collapses into a single point of infinite density?

• White dwarf

• Black hole

• Supernova

• Neutron star

Multiple Choice

What is the name of the process by which a star forms from a gas cloud and begins to use up its fuel?

• Nucleosynthesis

• Nuclear fusion

• Supernova

• Star formation

Multiple Choice

What is the name of the phase when a star has almost all of its helium fused into larger nuclei like carbon, and then oxygen?

• Red giant branch

• Main sequence

• Asymptotic giant branch

• Helium flash

Multiple Choice

What is the name of the event that occurs when the core of a star is above around 1.4 and 3 solar masses and collapses with such tremendous force that all the electrons get squeezed into protons?

• Black hole

• Supernova

• Planetary nebula

• Neutron star

Multiple Choice

What is the name of the phase when a star has almost all of its hydrogen burned into helium and maintains a relatively steady size, temperature, and luminosity?

• Main sequence

• Red giant branch

• Helium flash

• Asymptotic giant branch

Multiple Choice

What is the name of the object that is left behind when the core of a star is above around 3 solar masses and collapses into a single point of infinite density?

• Black hole

• Neutron star

• Supernova

• White dwarf

Multiple Choice

Which of these elements is synthesized during a supernova?

• Carbon

• Helium

• Oxygen

• Silver

Multiple Choice

What are the two elements formed during the creation of a low mass star?

• Carbon and Oxygen

• Gold and Silver

• Hydrogen and Helium

• Neon and Iron

Multiple Choice

The following elements are synthesized during the life cycle of a low-mass star EXCEPT...

• hydrogen

• helium

• oxygen

• iron

Multiple Choice

What is the name of the phase when a star has almost all of its helium fused into larger nuclei like carbon, and then oxygen, and then neon, and then silicon, and the star becomes smaller, hotter, and bluer?

• Red giant branch

• Main sequence

• Helium flash

• Asymptotic giant branch

Multiple Choice

Which of the following is a stellar core formed when the fragments of a collapsed molecular cloud contract?

• protostar

• supernova

• red giant

• main sequence star

Multiple Choice

The formation of a star starts with the dense regions of molecular clouds. What force pulls matter together to form these regions?

• magnetic force

• nuclear force

• electromagnetic force

• gravitational force

Multiple Choice

What happens when most of the hydrogen in the core is fused into helium in the stellar core?

• Hydrogen fusion stops, and the pressure in the core decreases.

• Hydrogen fusion continues, and the pressure in the core increases.

• Gravity squeezes the star until helium and hydrogen burning occur.

• Nuclear energy increases until carbon and helium burning occur.

Multiple Choice

Arrange the following stages of stellar evolution of a low-mass star.

• Blue-star $$\rightarrow$$ main sequence star $$\rightarrow$$ red giant $$\rightarrow$$ white dwarf

• Protostar $$\rightarrow$$ main sequence star $$\rightarrow$$ Blue star $$\rightarrow$$ white dwarf

• Main sequence star $$\rightarrow$$ red giant $$\rightarrow$$ blue star $$\rightarrow$$ white dwarf

• Main sequence star $$\rightarrow$$ Blue star $$\rightarrow$$ red giant $$\rightarrow$$ white dwarf

Multiple Choice

Which of the following is the major factor predicting the fate of a star?

• strength of gravitational force

• mass of the star

• amount of iron produced

• temperature of the star

Multiple Choice

Who formulated the Periodic Law?

• Dmitri Mendeleev

• Henry Gwyn Jeffreys Moseley

• Ernest Rutherford

• Isaac Newton

Multiple Choice

The invention of which device paved way for the transmuting one element into another artificially?

• cyclotron

• X-ray spectroscopy

• heavy projectiles

• Periodic Table

Multiple Choice

Neptunium (Z=93) is a transuranic element which was synthesized when what element was bombarded with a neutron?

• Bohrium

• Molybdenum

• Technetium

• Uranium

Multiple Choice

Superheavy elements are elements with atomic numbers beyond?

• 25

• 75

• 100

• 103

Multiple Choice

Which is NOT CORRECT about the arrangement of elements on the periodic table?

• It is arranged in random.

• It is arranged according to atomic number.

• It is arranged according to their properties.

• Electronegativity of elements increases from left to right.