Cor11 Physical Science

Question 1

1. In the main sequence star, what element is formed when hydrogen fuse in
   the star’s core?
   A. Helium C. Carbon
   B. Beryllium D. Oxygen
2. At approximately what temperature can nuclear reaction in a star’s core
   occur?
   A. 100,000 Kelvin C. 10,000,000 Kelvin
   B. 1,000,000 Kelvin D. 100,000,000 Kelvin
3. Through what process are stars in the universe formed?
   A. Nuclear fusion C. Nuclear decay
   B. Nuclear fission D. Nuclear transmutation
4. How is the heavy element Carbon formed in a star’s core?
   A. Explosion of the star C. Helium fusion
   B. Hydrogen fusion D. Oxygen fusion
5. Where is the site of the formation of heavier elements in the universe?
   A. Asteroid Belt C. Moon
   B. Earth D. Star
6. How many Helium atom/s fuse/s together to produce Carbon?
   A. 1 C. 3
   B. 2 D. 4
7. What piece of evidence of star formation provides a view of stars due to their
   heat energies?
   A. Abundance of light elements C. Redshift
   B. Infrared radiation D. Interstellar medium of gas &
   dust
8. What heavier element can a supergiant star only produce up to?
   A. Helium C. Iron
   B. Carbon D. Magnesium
9. Which of the following is the correct sequence of the evolution of the star?
   A. main sequence star, supergiant, red giant, supernova
   B. main sequence star, red giant, supergiant, supernova
   C. red giant, supergiant, main sequence star, supernova
   D. supernova, main sequence star, red giant, supergiant
10. What stage of the evolution of the star produces the element Iron (Fe)?
    A. Main sequence star C. Supergiant
    B. Red giant D. Supernova
11. What fuel is needed in a red giant star to begin its fusion reaction?
    A. Hydrogen C. Carbon
    B. Helium D. Iron
12. What signals the doom or death of a star?
    A. nucleosynthesis C. Supernova
    B. Formation of iron D. Alpha fusion
13. How are elements heavier than Iron (Fe) formed?
    A. Supernova C. Hydrogen Fusion
    B. Helium Fusion D. Fusion of more alpha particles
14. What happens to the mass of a star as time goes on?
    A. Lighter C. Constant
    B. Heavier D. Equilibrium
15. What happens to the core temperature of a star as it ages/ evolves?
    A. Decreases C. Constant
    B. Increases D. Increases then decreases

Answer 1

1. A
2. C
3. A
4. C
5. D
6. C
7. B
8. C
   B 9.
9. C
10. B
11. C
12. D
13. B
14. B

Question 2

1. Who among the scientists paved the way in discovering new elements using the
   concept of X-rays?
   A. Dmitri Mendeleev C. Ernest Rutherford
   B. Henry Moseley D. Ernest Lawrence
2. What is the first man-made element discovered in 1937?
   A. Uranium C. Astatine
   B. Plutonium D. Technetium
3. What determines in identifying of a new synthesized element?
   A. atomic number C. number of neutrons
   B. atomic mass D. radiation type
4. What device is used by scientists to synthesize the elements Technetium and
   Astatine with atomic numbers 43 and 85, respectively?
   A. nuclear reactor C. nuclear transmitter
   B. particle accelerator D. alpha particles
5. What atomic number marks the start of transuranium elements of the Periodic
   Table of Elements?
   A. 91 C. 93
   B. 92 D. 94
6. Hydrogen has an atomic number of 1. What does atomic number mean in an
   element?
   A. number of particles C. number of protons
   B. number of neutrons D. number of atoms
7. What type of nuclear radiation particle is utilized in the reaction found inside the
   box?
   Bi 83
   209 + 2He 4
   At 85
   211 + 2 0n
   1
   A. alpha C. gamma
   B. beta D. deuteron
8. In the equation below, what is the new element formed?
   92U
   238 + 0n
   1
   93Np 239 + −1β
   0
   A. neutron C. Np
   B. beta D. U
9. Ernest Lawrence bombarded Molybdenum with fast-moving neutrons. What is
   the new element formed in the equation below?
   42Mo 96 + 1H
   2
   43Tc 97 + 0n
   1
   A. H C. Tc
   B. Mo D. He
10. Which of the following transuranium elements is used to coat steel to
    prevent corrosion?
    A. Plutonium C. Astatine
    B. Neptunium D. Technetium

Answer 2

Let Us Assess
B 1.
D 2.
A 3.
B 4.
C 5.
Let Us Assess
C 6.
A 7.
C 8.
C 9.
D 10.