# Physical Science (GS 103-3)

1. Planck’s constant is $6.6*10^{-34} JS$ and proton mass $1.7*10^{-27}kg$. The speed of a proton whose de Broglie wavelengths in $4.0*10^7$  m is

$7.8 * 10{-20} m/s$
$9.9 * 10^2 m/s$
$1.9 * 10^6 m/s$
$3.9 x 10^6 m/s$

2. Which one or more of the following statement is true in general?
alpha particles are less able to penetrate matter than beta particles
alpha particles are better to penetrate matter than beta particles
alpha particles are less able to penetrate matter the gamma rays
alpha particles are better able to penetrate matters than gamma rays
Both A and C

3. The speed of a photon.
is less than the speed of light
is equal to the speed of light
is greater than the speed of light
any to these choices could be correct, depending on its frequency

4. An X-ray photon has an energy of $3.3 * 10^{15} J$ and Planck’s constant is $6.6*10^{-34} JS$. The frequency that corresponds to this energy is.
$3.3 * 10^{-50} Hz$
$3 * 10^{-19} Hz$
$3.3 * 10^{18} Hz$
$3.3 * 10^{20} Hz$

5. The charge on halogen ions is
+1
+2
-1
-2

6. The number of units of NaOH needs to react with 1 unit of H3PO4 to form NaPO4 and H2O is.
1
2
3
4

7. The light waves from a laser.
have different wavelengths
have different speeds
are in step with one another
spread out to form a wide beam.

8. At room temperature, bromine is a
colorless gas
greenish-yellow gas
reddish-brown liquid
steel-gray solid

9. protons and neutrons are held together to form nuclei by the
gravitational interaction
strong interaction
weak interaction
electromagnetic interaction

10. A molecule of heavy water contains
two oxygen atoms instead of one
three hydrogen atoms instead of two
deuterium atoms instead of hydrogen atoms
a deuterium atom instead of an oxygen atom

11. The interaction responsible for the structure of atoms, molecules, liquids, and solids is the
gravitational interaction
strong interaction
weak interaction
electromagnetic interaction

12. The statement that the elements in a given compound are always combined in the same proportions by mass is known as.
the periodic law
the law of definite proportions
the law of conservation of mass
Dalton’s law

13. The scientist who first established the relative masses of different was
Mendeleev
Maxwell
Priestley
Dalton

14. The chromate ion has the formula CrO4^2-. The formula of tin(i) chromate is
SnCrO4
Sn2CrO4
Sn(CrO4)2
Sn2(CcrO4)2

15.Of the halogens at room temperature and atmospheric pressure
all are gases
one is a gas and the other is liquids
one is gas and the others are solids
one is a liquid and the others are gases or solids

16. The number or values the spin magnetic quantum number ms of an atomic electron can have is.
1
2
Always equal to n, the principal quantum number
Always equal to 2n

17. The number of atoms in molecule of Ca3(PO4)2 is
8
12
13
16

18. Which one or more of the following events can raise an atom from its ground state to an excited state?
spontaneous emission of a photon
induced emission of a photon
absorption of a photon
a collision with another atom
both C and D

19. Element with similar properties (other than atomic mass)
occupy the same period of the periodic table
have similar electron configurations
have the same number of neutrons in their nuclei
exist in the same physical state(solid, liquid, or gas)

20. Each horizontal row of the periodic table includes elements
identical
similar
different
sometimes similar and sometimes different