Third Quarterly Exam Practice Questions
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FIRST QUARTERLY PRACTICE QUESTIONS
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1.
A sphere has a negative charge
of 6.4 x 10-7 C. How many electrons must be removed to make the sphere
neutral ?
1.6 x
10-8
9.8 x
105
6.4 x
1026
4.0 x
1012
2.
Three 3.0 ohm resitors are
connected in parallel. What is their equivalent resistance ?
1.0 ohm
3.0
ohms
9.0
ohms
0.33
ohms
3.
The resultant of two forces
acting on the same point at the same time will be greatest when the angle
between the forces is
0
degrees
45
degrees
90
degrees
180
degrees
4.
What is the weight of a 5.0 kg
object at the surface of the earth ?
5.0 kg
25 N
49 N
49 kg
5.
Energy is measured in the same
units as
force
momentum
work
power
6.
If the length of a copper wire
is reduced by half, the resistance of the wire will be
halved
doubled
quartered
quadrupled
7.
Three resistors of 1, 2, and 3
ohms are connected in series to a 6 V battery. What is the current in this circuit ?
1 A
2 A
3 A
6 A
8.
A student drops an object
from the top of a building which is 19.6 m from the ground. How long does it take
the object to fall to the ground
?
19.6 s
2.00 s
3.00 s
4.00 s
9.
Two point masses that are
equal are separated by a distance of 1 m. If one mass is doubled, the gravitational
force between the two masses
would be
one-half
as great
two
times greater
one-fourth
as great
four
times greater
10.
An impulse X is applied to an
object. The change in momentum of the object is
X
2X
X/2
4X
11.
A weightlifter lifts a 2000 N
weight a vertical distance of 0.5 m in 0.1 s. What is the power output ?
1 x
10^-4 W
4 x
10^-4 W
1 x 10^4
W
4 x
10^4 W
12.
A flow rate of 1 C per 0.1
second is measured in a wire. What is the electrical current in the wire ?
1 A
0.1 A
10 A
100 A
13.
An unbalanced force of 10 N
acts on a 20 kg mass for 5 seconds. The acceleration of the mass is
0.5
m/s^2
2
m/s^2
40
m/s^2
200
m/s^2
14.
Ten joules of work are done
in accelerating a 2.0 kg mass from rest across a horizontal frictionless table.
The total kinetic energy gained
by the mass is
3.2 J
5.0 J
10. J
20. J
15.
If the current in a wire is
2.0 A and the potential difference across the wire is 10. V, what is the wire's resistance
?
5.0 ohms
8.0
ohms
12
ohms
20
ohms