Physical Science

Question 1

1. Which of the following statements is FALSE?
   a. The core of red giant star is made up of carbon
   b. The average star has shorter life span
   c. The more massive the star is the faster it burns
   its fuel
   d. No elements heavier than Iron can be produced
   in a massive star

Answer 1

d. No elements heavier than Iron can be produced
in a massive star

Question 2

2. Which among the following statements is NOT TRUE?
   a. The Fusion reaction that happens inside the
   stars’ core as it converts hydrogen(H) into
   helium (He), heat, and radiation.
   b. The alpha process then fuses helium (He) with
   carbon to make denser elements, but only
   those with an even number of protons.
   c. Since the cosmos began, a few of the heavier
   elements in the universe were made when two
   neutron stars collided together and exploded
   with a mighty crash.
   d. Gravity happened to be at the wrong place and
   these atoms were pulled together into huge
   clouds of gas in the emptiness of space.

Answer 2

d. Gravity happened to be at the wrong place and
these atoms were pulled together into huge
clouds of gas in the emptiness of space.

Question 3

3. Which of the following intermolecular forces of
   attraction (IMFA) is arranged from strongest to
   weakest?
   a. Dipole-dipole – London forces – Hydrogen
   bonding
   b. Hydrogen bonding – London forces – dipoledipole
   c. London-forces – dipole-dipole – Hydrogen
   bonding
   d. Hydrogen bonding – dipole-dipole – London
   forces

Answer 3

d. Hydrogen bonding – dipole-dipole – London
forces

Question 4

4. It was created by bombardment of molybdenum by
   deuterons (heavy hydrogen, H12), by Emilio Segre and
   Carlo Perrier in 1937.
   a. Oxygen
   b. Technetium
   c. Helium
   d. Uranium

Answer 4

b. Technetium

Question 5

5. Which of the following bonds is the MOST polar?
   a. H-Cl
   b. N-F
   c. C-Cl
   d. H-H

Answer 5

b. N-F

Question 6

6. Which process is responsible for the formation of
   light elements such as Hydrogen (H) and Helium (He)?
   a. supernova nucleosynthesis
   b. stellar nucleosynthesis
   c. terrestrial nucleosynthesis
   d. big bang nucleosynthesis

Answer 6

d. big bang nucleosynthesis

Question 7

7. Which of the following is TRUE about
   nucleosynthesis?
   a. It is the creation of everything including all
   matter in universe
   b. It is the process of creating new atomic nuclei
   from pre-existing nuclei
   c. It is the division of atomic particle
   d. The combination of elements to form
   compound

Answer 7

b. It is the process of creating new atomic nuclei
from pre-existing nuclei

Question 8

8. The substance or particles that enter into and is
   altered in the course of a chemical reaction.
   a. Catalyst
   b. Enzyme
   c. Product
   d. Reactant

Answer 8

d. Reactant

Question 9

9. Which nutrient group is used in the composition of
   waxes and responsible for insulation of some
   organisms?
   a. lipids
   b. proteins
   c. carbohydrates
   d. nucleic acids

Answer 9

a. lipids

Question 10

10. What happens to the surface tension of liquids as
    temperature increases?
    a. remains the same
    b. decreases only
    c. may decrease or increase
    d. increases only

Answer 10

b. decreases only

Question 11

11. The condition that needs to be met for a chemical
    reaction to occur.
    a. Substance must be homogeneous.
    b. Particles in the substance must collide and have
    enough energy.
    c. Temperature should be kept constant.
    d. Particles should maintain a certain distance to
    each other.

Answer 11

b. Particles in the substance must collide and have
enough energy.

Question 12

12. This is a major insoluble fibrous protein found in
    connective tissues such as tendons, ligaments, skin,
    cartilage and the cornea of the eye. What is it?
    a. albumin
    b. keratin
    c. collagen
    d. pepsin

Answer 12

c. collagen

Question 13

13. Which of the following would NOT increase the rate
    of reaction?
    a. Increasing the temperature
    b. Adding catalyst
    c. Increasing the concentrations
    d. Increasing the volume

Answer 13

d. Increasing the volume

Question 14

14. Which organic molecule gives fast source of energy?
    a. lipids
    b. carbohydrates
    c. nucleic acids
    d. proteins

Answer 14

b. carbohydrates

Question 15

15. Ion-dipole interaction results from the __________
    a. Repulsion between a polar with a nonpolar
    molecule.
    b. Attraction between an ion and a polar
    molecule.
    c. Repulsion between a dipole and another
    dipole.
    d. Attraction between a polar with another polar
    molecule.

Answer 15

b. Attraction between an ion and a polar
molecule.

Question 16

16. A nonpolar covalent bond would form in which of
    the following pairs of atoms?
    a. Na-Cl
    b. Ca-O
    c. P-N
    d. C-S

Answer 16

a. Na-Cl

Question 17

17-21. Identify what factor affects the rate of chemical
reaction in the following situations. Use the choices
below.
a. Temperature
b. Concentration
c. Particle Size
17. A coal dust explosion happens in mines.
18. The food was refrigerated.
19. Kindling is used to start a fire.
20. Acid rain erodes marble fast.
21. Two antacid tablets neutralize acids faster than one
tablet.

Answer 17

C Particle Size, A Temperature , C Particle Size, B Concentration, B Concentration

Question 18

22. Which element will be formed when Carbon (C)
    atom is combined with Helium (He) atom?
    a. Oxygen
    b. Sulfur
    c. Neon
    d. Magnesium

Answer 18

a Oxygen

Question 19

23. How does dipole-dipole interaction happen?
    a. The (-) and (+) ends of one polar molecule align
    themselves to the (+)and (-) ends of another
    polar molecule and attract each other
    b. Polar molecules shift electron density that gives
    rise to neutral substances.
    c. The electron distribution in the polar molecules
    is distorted that results to (-) and (+) poles.
    d. Polarization of big nonpolar molecules brings
    about the formation of permanent (+) and (-)
    charges.

Answer 19

a The (-) and (+) ends of one polar molecule align
themselves to the (+)and (-) ends of another
polar molecule and attract each other

Question 20

24. Which among the following terms refer to the ability
    of an atom in a molecule to attract shared electrons?
    a. Molecular polarity
    b. Covalent bonding
    c. Electron affinity
    d. Electronegativity

Answer 20

d Electronegativity

Question 21

25. Which among the following best describes the given
    statements?
    1st Statement - A molecule shape is a three-dimensional
    arrangement of atoms or bonding groups around a
    central atom.
    2nd Statement - The molecular shape is governed by
    the valence shell electron repulsion (VSEPR) theory.
    a. The first statement is false while the second
    statement is true.
    a. The first and second statements are true.
    b. The first statement is false while the second
    statement is true.
    c. The first statement is true while the second
    statement is false.

Answer 21

a. The first and second statements are true.

Question 22

26. What is true about intermolecular forces?
    a. There is a vague relationship between
    intermolecular forces and bulk properties.
    b. They are strong bonds that form between
    atoms of molecules.
    c. Substances can form more than one but one
    will predominate.
    d. They are stronger than the

Answer 22

a There is a vague relationship between
intermolecular forces and bulk properties

Question 23

27. Methane will not dissolve in water due to
    ____________.
    a. difference in intermolecular forces between the
    two substances.
    b. the same intermolecular forces they possess.
    c. difference in the kinds of atoms in their
    structure.
    d. greater molar mass of H2O than CH4.

Answer 23

d. greater molar mass of H2O than CH4.

Question 24

28. Why does a candle burn more rapidly when placed
    in an open jar than in air? What accounts for this
    reaction?

Answer 24

a. Length of the candle
b. Higher Oxygen concentration
c. Greater surface area of the jar
d. Increasing the surrounding temperature

Question 25

29. Which of the IMF has attractive forces between polar molecules where the positive end of one molecule aligns to the negative end of another molecule a. ion-induced dipole b. ion-dipole c. dipole-dipole d. dispersion forces

Answer 25

c. dipole-dipole

Question 26

30. It is a device that is used to speed up the protons to overcome the repulsion between the protons and the target atomic nuclei by using magnetic and electrical fields. a. Particle Accelerator b. Microscope c. Spectroscopy d. Particle Decelerator

Answer 26

a. Particle Accelerator

Question 27

31. Which of the following substances will dissolve most likely in water? a. Carbon tetrachloride (CCl 4 ) b. Oil c. Hexane (C 6 H 14 ) d. Vinegar (CH 3 COOH)

Answer 27

d. Vinegar (CH 3 COOH)

Question 28

32. How do heavier elements formed? a. Through combustion b. Through nuclear fission c. Through nuclear synthesis d. Through nuclear fusion

Answer 28

d. Through nuclear fusion

Question 29

33. Why are dispersion forces high in molecules with a great number of electrons? a. The nucleus in the molecules has a greater effective shielding effect. b. The electrons move freely around the nucleus resulting in greater energy. c. The electrons in the molecules can easily jump from one orbital to another. d. The electron distribution of big molecules is easily polarized.

Answer 29

d. The electron distribution of big molecules is easily polarized.

Question 30

34. H-bonding forms when the substances involved are polar and have molecules with a. Unshared pair of electrons in the central atom. b. C-atoms attached to O, N, F. c. H-atoms attached to O, N, F. d. Central atoms with O, N, F as attached atoms.

Answer 30

c. H-atoms attached to O, N, F.

Question 31

35. Which of the following statements is INCORRECT? a. Polar bond forms when electrons are unequally shared by two atoms in a compound. b. Polarity of bond and molecular geometry are the two factors that affect the polarity of molecules. c. Polar covalent bonds can be present in a nonpolar molecule. Polar covalent bond is present if the electronegativity difference between atoms is equal or less than 0.4.

Answer 31

c. Polar covalent bonds can be present in a nonpolar molecule. Polar covalent bond is present if the electronegativity difference between atoms is equal or less than 0.4.

Question 32

36. Supposedly a hypothetical molecule has an electronegativity difference of 0.5, what is the type of chemical bond present? a. Hydrogen b. Polar covalent c. Ionic d. Nonpolar covalent

Answer 32

b. Polar covalent

Question 33

37. At any certain time the shift in the position of the electrons in an atom will likely create a temporary positive and negative pole. This is known as_________ a. dipole forces b. instantaneous dipole c. dipole moment d. dispersion forces

Answer 33

d. dispersion forces

Question 34

38. London dispersion forces are a function of the molar mass of substances. What happens to the dispersion forces of the molecules when the molar mass increases? a. cannot be measured b. increase c. remain the same d. decrease

Answer 34

b. increase

Question 35

39. Which of the following is NOT TRUE about CO2? a. Has a linear molecular shape b. Has an electronegativity difference of 1.0 c. Polar bond is present d. Is a polar molecule

Answer 35

d. Is a polar molecule

Question 36

40. Which of the following is NOT an example of viscous substance? a. honey b. blood c. vinegar d. syrup

Answer 36

c. vinegar

Question 37

41. Which molecular geometry is POLAR? a. b. c. ----/\----------- d.

Answer 37

C ----/\-----------

Question 38

42. Which of the following is NOT TRUE about water? a. has low viscosity b. has high surface tension c. becomes denser when freezes d. has high boiling point

Answer 38

c. becomes denser when freezes

Question 39

43. Which of the following statements is NOT TRUE about polar bonds? a. They may result to nonpolar covalent compounds depending on molecular geometry. b. They are present in metals. c. They may result to the formation of polar molecular compounds. d. They are responsible for the formation of ionic compounds.

Answer 39

b. They are present in metals.