Physics: Electric Potential and Potential Difference
UNIVERSITY ENTRANCE EXAMINATION
PHYSICS
Duration
: 2 hours
Please read the following instructions carefully.
1.
This paper is made up of 50 Multiple-Choice questions and comprises ELEVEN
(11) printed pages.
2.
Do not write on the question paper.
3.
Answer all questions and indicate your answers on the answer sheet provided.
Marks will not be deducted for wrong answers.
4.
Do not take any paper, including the question paper or unused answer sheets, out of the examination hall.
1
Multiple-Choice Questions
Answer all questions in this section.
1.
The mass of an isotope of uranium
238
92
U is 238.05 g mol–1. Its density is 19.1
g cm–3 at room temperature. Which of the following is closest to the number of 238U atoms in 1 cm3 of this isotope?
92
A
B
C
D
E
2.
2.53x1021
3.29x1022
4.83x1022
6.02x1023
7.51x1024
An isotope of plutonium
239
94
Pu decays by alpha emission.
Which of the
following is the decay product?
243
A
96 Cm
B
235
94
Pu
C
239
93
Np
D
235
92
U
E
234
90
Th
3.
A compact disc of diameter 120 mm is spinning at a speed of 500 revolutions per minute. Which of the following is closest to the linear speed of the outer edge of the disc?
A
0.50 m s–1
B
1.0 m s–1
C
1.6 m s–1
D
3.1 m s–1
E
60 m s–1
4.
A steel wire is stretched and clamped between two fixed points that are spaced 1.0 m apart. Which of the following is closest to the fundamental wavelength that can exist on this wire?
A
B
C
D
E
5.
0.25 m
0.50 m
1.0 m
2.0 m
4.0 m
A thin converging lens of focal length 20 cm is used to shape light from a lamp filament into a parallel beam. Which of the following is closest to the required distance between the lamp filament and the lens?
A
B
C
D
E
5.0 cm
10 cm
20 cm
40 cm
80 cm
2
6.
A metallic sphere of radius 1.0 cm is charged with 1.0x109 electrons in air.
Which of the
PHYSICS
Duration
: 2 hours
Please read the following instructions carefully.
1.
This paper is made up of 50 Multiple-Choice questions and comprises ELEVEN
(11) printed pages.
2.
Do not write on the question paper.
3.
Answer all questions and indicate your answers on the answer sheet provided.
Marks will not be deducted for wrong answers.
4.
Do not take any paper, including the question paper or unused answer sheets, out of the examination hall.
1
Multiple-Choice Questions
Answer all questions in this section.
1.
The mass of an isotope of uranium
238
92
U is 238.05 g mol–1. Its density is 19.1
g cm–3 at room temperature. Which of the following is closest to the number of 238U atoms in 1 cm3 of this isotope?
92
A
B
C
D
E
2.
2.53x1021
3.29x1022
4.83x1022
6.02x1023
7.51x1024
An isotope of plutonium
239
94
Pu decays by alpha emission.
Which of the
following is the decay product?
243
A
96 Cm
B
235
94
Pu
C
239
93
Np
D
235
92
U
E
234
90
Th
3.
A compact disc of diameter 120 mm is spinning at a speed of 500 revolutions per minute. Which of the following is closest to the linear speed of the outer edge of the disc?
A
0.50 m s–1
B
1.0 m s–1
C
1.6 m s–1
D
3.1 m s–1
E
60 m s–1
4.
A steel wire is stretched and clamped between two fixed points that are spaced 1.0 m apart. Which of the following is closest to the fundamental wavelength that can exist on this wire?
A
B
C
D
E
5.
0.25 m
0.50 m
1.0 m
2.0 m
4.0 m
A thin converging lens of focal length 20 cm is used to shape light from a lamp filament into a parallel beam. Which of the following is closest to the required distance between the lamp filament and the lens?
A
B
C
D
E
5.0 cm
10 cm
20 cm
40 cm
80 cm
2
6.
A metallic sphere of radius 1.0 cm is charged with 1.0x109 electrons in air.
Which of the