The document contains 25 multiple choice questions about various topics in chemistry and biology including atomic structure, chemical bonding, photosynthesis, cellular respiration, and biodiversity. The questions assess understanding of key concepts such as the components of an atom's nucleus, Bohr's atomic model, types of chemical bonds, and processes like glycolysis and the electron transport chain.

1. 1. On the basis of Rutherford’s model of an atom, which
subatomic particle is present in
the nucleus of an atom?
a. proton and electron c. proton and neutron
b. neutron and electron d. proton only

2. 2. The symbol “n” in the Bohr theory of
atomic structure refers to _____
a. the energy of electron
b. the number of electron in an energy level
c. the total energy of the atom
d. the orbit in which an electron is found

3. 3. When does covalent bonding take
place?
a. It takes place when atoms share electrons with one another.
b. It takes place when the attraction between atoms is strong.
c. It takes place when atoms collide with one another.
d. It takes place when atoms attain stability.

4. 4. Which hydrocarbon compound has a
double bond in the molecule?
A. ethane C. propene
B. methane D. propyne

5. 5. How many particles are there in one
mole of any kind of substance?
a. 3.01 x 10 23 c. 6.02 x 10 23
b. 3.01 x 10 23 d. 6.02 x 10 24

6. 6. Which activity does not contribute to
global warming?
a. Reforestation c. mining activities
b. illegal fishing d. incineration of
garbage

7. 7. Which of the following can cause
global warming?
a. volcanic eruptions
b. the amount of rainfall
c. the rising of warm air into the atmosphere
d. increase of the amount of CO2 in the atmosphere

8. 8. Why do places at the same latitude but
different altitudes have different climate?
a. Amount of heat received varies.
b. Amount of precipitation differs.
c. Higher altitudes have lower temperature.
d. Higher altitudes have higher temperature.

9. 9. Which atomic model is proposed by
Schrodinger?
a. nuclear model c. planetary model
b. raisin bread model d. quantum mechanical
model

10. 10. Who proposed the probability that
electrons will be found in certain locations
around the nucleus of an atom?
a. Neils Bohr c. Ernest Rutherford
b. Erwin Schrodinger d. J.J. Thomson

11. 11. Which of the following units is used in expressing
the amount of substance in terms of
the number of particle?
a. liter c. gram
b. mole d. Celcius

12. 12. How many percent of hydrogen (H)
is present in water (H2O)?
a. 12% c. 11%
b. 13% d. 10%

13. 13. Which of the following is an active
volcano in the Philippines?
a. Apo in Davao
b. Bud Datu in Sulu
c. Isarog in Camarines Sur
d. Kanlaon in Negros Oriental

14. 14. City A is surrounded by bodies of water
and has a moderate climate. It is located
near the equator. What will most likely affect
the climate of the city?
a. latitude c. topography
b. altitude d. all of these

15. 15. Plants are considered as food makers. In which of
the following cell organelles does photosynthesis
occur?
a. ribosome c. chlorophyll
b. chloroplast d. mitochondrion

16. 16. The light-dependent reaction of photosynthesis must
come first before the light independent reaction because
its products are important to the fixation of carbon
dioxide. Which of the following is/are the product/s of the
light–dependent reaction?
a. ADP only c. NADPH only
b. ATP only d. NADPH and ATP

17. 17. How many molecule/s of carbon dioxide
is/are released from one pyruvic acid
molecule being oxidized?
a. 1 b. 3 c. 2 d. 4

18. 18. Oxygen is essential in cellular respiration.
What is the role of oxygen in the electron
transport chain?
a. It provides a high energy proton.
b. It releases an electron.
c. It serves as the final acceptor
d. It forms water.

19. 19. When cells break down food into
chemical energy it undergoes three major
processes, glycolysis, Krebs cycle and
electron transport. Which of these processes
provides the most number of ATP molecules?
a. Glycolysis c. Krebs cycle
b. electron transport chain d. both a & b

20. 20. Which of the following statements is
NOT true of the atomic model of Bohr?
a. The hydrogen is made up of a positively charged nucleus
b. The electron revolves around the nucleus in a circular
orbit.
c. The energy of the electron in a given orbit is not fixed.
d. An electron can absorb or emit a quantity of radiation.

21. 21. All statements are true about metal
atoms EXCEPT.
a. Form positively charged ions
b. Tend to lose one or more electrons
c. Forms ionic bonds with non- metals
d. Tend to share electrons to acquire the
electronic arrangement of a noble gas

22. 22. What bond holds the atom of elements in
Group 1 and 2 of the periodic table?
a. ionic bond
b. polar covalent bond
c. nonpolar covalent bond
d. metallic bond

23. 23. Which is useful in determining the
type of bond molecules formed?
a. electron affinity
b. ionization energy
c. electronegativity
d. atomic size

24. 24. Which of the following best describes
biodiversity?
a. Biodiversity refers to the variety of life in an area.
b. Biodiversity refers to the variety of non-living things in
an ecosystem
c. Biodiversity refers to the interaction of livings in
different ecosystems
d. Biodiversity refers to the similarities of organisms living
in an ecosystem

25. 25. _____________ occurs when the last
members of that species die
a. Endangered
b. Threatened
c. Extinct
d. All of the above