Dr.
Nesreen Medhat
+201004677030
1) What is the neutral subatomic particle that placed inside the nucleus of atom?
A. Protons.
B. Electrons.
C. Neutrons.
D. Energy levels.
2. What happened when N atom changed to N+?
A. lost electron
B. gained electron
C. shared electron
D. no change happened
3. When atoms share electron, it forms
A. covalent bond
B. ionic bond
C. peptide bond
D. hydrogen bond
4. Protons and neutrons are found in the atom
A. the neutrons are positive and inside the nucleus
B. the protons are negative and outside the nucleus
C. the neutrons have no charge and inside the nucleus
D. the protons are positive and outside the nucleus
5. What is the interaction between water molecules?
A. adhesion
B. cohesion
C. root pressure
D. capillarity
6. Which of the following is correct about the number of protons, electrons and neutrons
in carbon 13?
A. 6 protons, 6 electrons, 6 neutrons
B. 6 protons, 6 electrons, 7 neutrons
C. 5 protons, 5 electrons, 8 neutrons
D. 5 protons, 5 electrons, 5 neutrons
7. What is the type of bond represented by arrow?
A. covalent because they share electrons
B. covalent because they give electrons
C. ionic because they share electrons
D. ionic because they give electrons
1
Dr.Nesreen Medhat
+201004677030
8. water exit our skin through sweating. Which bond will disrupt while water convert from
liquid to gas?
a) Covalent bond.
b) Hydrogen bond.
c) Ionic bond.
d) Vander walls bond.
9. Which of the following does this structural formula
represents?
A. An atom
B. An ion
C. A molecule
D. An element
E. A mixture
10. Water rises from the roots through the stem in a plant against the force of gravity due to
the _____________ force in water. However, what keeps the column of water together as the
water rises is the _____________ force between the water molecules.
A. adhesion, cohesion
B. cohesion, adhesion
C. cohesion, capillary action
D. surface tension, adhesion
E. capillary action, adhesion
11. Isotopes differ from each other only in
A. the number of electrons
B. the number of protons
C. the number of neutrons
D. how they react chemically
E. the size of the atom
12. Which of the following are weak forces usually associated with biological molecules?
(A) hydrogen bonds
(B) electrostatic interactions
(C) covalent bonds
(D) ionic bonds
(E) both (A) and (B)
13Which property of water is directly responsible for lowering body heat with sweat?
A. Heat capacity
B. Surface tension
C. Cohesion
D. Heat of vaporization
2
Dr.Nesreen Medhat
+201004677030
14 Which of the following best describes why ice has a lower density than liquid water?
A. There is more space between individual atoms at lower temperatures, which means colder
water has a lower density.
B. The water molecules have less atomic motion than ice.
C. Because water changes from its polar form as a liquid to its nonpolar form as a solid.
D. Hydrogen bonding causes water to crystallize with more empty space between molecules
than in the liquid state.
15 Attraction between water molecules are called:
A. Polar bond
B. Ionic bond
C. Covalent bond
D. Hydrogen bond
16. Water is important to all living things.
How does the high heat capacity of water help support life?
A. It makes water better at dissolving nonpolar substances like oils.
B. It makes water safer for most animals to consume as a high heat capacity reduces
harmful pathogens in the solution.
C. It makes water a great habitat for marine life because marine organisms do not
experience a wide temperature range.
17 Which of the following best describes a result of the polar nature of water molecules?
A. Ionic compounds dissolve easily in water.
B. The volume of water decreases by nearly half when it is frozen.
C. Water molecules repel each other.
D Water molecules repel most other substances.
18. Water makes up approximately 60% of the human body and plays a vital role in regulating
body temperature. Which property of water makes it good at regulating temperature?
A. Water is a good solvent.
B. Water exhibits strong cohesion.
C. Water has an unusual crystalline structure.
D. Water has a high capacity for heat
3
Dr.Nesreen Medhat
+201004677030
19. Why does ice stay at the top of oceans instead of sinking to the bottom?
A. Ice is colder than liquid water.
B. Ice is less dense than liquid water.
C. Ice is more dense than liquid water.
D. Ice is warmer than liquid water.
20. Which is not true about the characteristics of water?
A. It has high heat of vaporization and high adhesion properties
B. It has high adhesion property and strong cohesion tension
C. It has a high specific heat and exhibits strong cohesion tension
D. It is a universal solvent and has low adhesion property
21. Which of the following is not a characteristic of water?
A. Water has a high specific heat
B. Water has a high heat of vaporization
C. Water exhibits strong cohesive tension
D. Water is less dense than ice
E. water is a universal solvent
