Download fake sem 2 unit 1 test.tst

Name: ________________________ Class: ___________________ Date: __________
ID: A
Fake Sem 2 Unit 1
Multiple Choice
Identify the choice that best completes the statement or answers the question.
____
1. According to the first law of thermodynamics, the difference between energy transferred to or from a system
as heat and energy transferred to or from a system by work is equivalent to which of the following?
a. entropy change
c. volume change
b. internal energy change
d. pressure change
____
2. According to the second law of thermodynamics, which of the following statements about a heat engine
operating in a complete cycle must be true?
a. Heat from a high-temperature reservoir must be completely converted to work.
b. Heat from a high-temperature reservoir equals the entropy increase.
c. Heat from a high-temperature reservoir must be completely converted to internal energy.
d. Heat from a high-temperature reservoir cannot be completely converted to work.
____
3. An electrical power plant manages to transfer 88 percent of the heat produced in the burning of fossil fuel to
convert water to steam. Of the heat carried by the steam, 40 percent is converted to the mechanical energy of
the spinning turbine. Which best describes the overall efficiency of the heat-to-work conversion in the plant?
a. greater than 88 percent
c. 40 percent
b. 88 percent
d. less than 40 percent
____
4. A repelling force occurs between two charged objects when the charges are of
a. unlike signs.
c. equal magnitude.
b. like signs.
d. unequal magnitude.
____
5. When a glass rod is rubbed with silk and becomes positively charged,
a. electrons are removed from the rod.
c. protons are added to the silk.
b. protons are removed from the silk.
d. the silk remains neutral.
____
6. The figure shown above demonstrates charging by
a. grounding.
c. polarization.
b. induction.
d. contact.
1
Name: ________________________
ID: A
____
7. Two point charges, initially 2 cm apart, are moved to a distance of 10 cm apart. By what factor does the
resulting electric force between them change?
1
a. 25
c.
5
1
b. 5
d.
25
____
8. Two positive charges, each of magnitude q, are on the y-axis at points y = +a and y = –a. Where would a
third positive charge of the same magnitude be located for the net force on the third charge to be zero?
a. at the origin
c. at y = –2a
b. at y = 2a
d. at y = –a
____
9. When a positive charge moves in the direction of the electric field, what happens to the electrical potential
energy associated with the charge?
a. It increases.
b. It decreases.
c. It remains the same.
d. It sharply increases, and then decreases.
____ 10. Charge buildup between the plates of a capacitor stops when
a. there is no net charge on the plates.
b. unequal amounts of charge accumulate on the plates.
c. the potential difference between the plates is equal to the applied potential difference.
d. the charge on both plates is the same.
____ 11. The amount of charge that moves through the filament of a lightbulb in 2.00 s is 2.67 C. What is the current
in the lightbulb?
a. 5.34 A
c. 0.835 A
b. 1.33 A
d. 0.417 A
____ 12. A lightbulb has a resistance of 240 Ω when operating at 120 V. What is the current in the lightbulb?
a. 2.0 A
c. 0.50 A
b. 1.0 A
d. 0.20 A
____ 13. Which process will double the power dissipated by a resistor?
a. doubling the current while doubling the resistance
b. doubling the current and making the resistance half as big
c. doubling the current and doubling the potential difference
d. doubling the current while making the potential difference half as big
____ 14. A color TV draws about 2.5 A when it is connected to a 120 V outlet. Assuming electrical energy costs
$0.060 per kW•h, what is the cost of running the TV for exactly 8 h?
a. $0.014
c. $0.14
b. $0.03
d. $0.30
2
Name: ________________________
ID: A
____ 15. Three resistors with values of R 1 , R 2 , and R 3 are connected in series. Which of the following expresses the
total resistance, R eq , of the three resistors?
a.
b.
Req = R1 + R2 + R3
ÊÁ 1
1
1 ˆ˜˜˜
ÁÁ
Á
˜˜
+
+
Req = ÁÁ
Á R 1 R 2 R 3 ˜˜
Ë
¯
c.
d.
Req = R1 = R2 = R3
−1
ÊÁ 1
1
1 ˆ˜˜˜
ÁÁ
˜˜
+
+
Req = ÁÁÁ
Á R 1 R 2 R 3 ˜˜
Ë
¯
____ 16. Three resistors with values of 3.0 Ω, 6.0 Ω, and 12 Ω are connected in parallel. What is the equivalent
resistance of this combination?
a. 0.26 Ω
c. 9.0 Ω
b. 1.7 Ω
d. 21 Ω
3
ID: A
Fake Sem 2 Unit 1
Answer Section
MULTIPLE CHOICE
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
B
D
D
B
A
C
D
A
B
C
B
C
B
C
A
B
1