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Solutions to Practice Test 1
1.
If mass is measured in kg, length in m and time in s, what is the unit
of
?
mass
area
c.
kg/m
2
2.
If x is measured in ms
1
and y measured in s, what is the unit of x/y?
1
2
x
ms
ms
y
s


=
=
a.
ms
2
3.
If the radius of a sphere is 1.20 cm, what is its volume in m
3
?
3
3
6
2
4
4
(0.012 m)
7.24 10 m
3
3
v
r
π

=
=
=
×
d.
7.24
×
10
6
4.
If the mass of a substance is 1.2
×
10
6
kg and its volume is 7.3 x 10
2
m
3
, what is the mass per unit volume of the substance?
6
7
3
2
3
1.2 10 kg
1.6 10 kg.m
7.3 10 m
mass
volume

×
=
=
×
×
c.
1.6 x 10
7
5.
Which of the following is a vector quantity?
a.
velocity
6.
A moving object is at x = 5.0 m and at x = 1 at
t = 2.0 s. What is the
displacement of the object?
Displacement = x
2
– x
1
= 1 – (5) = 1 + 5 = 4.0 m
d.
4.0 m
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7.
What is the velocity of the object in question 6 above?
1
displcement
4.0
Average velocity =
2.0 ms
time
2.0
m
s
=
=
c.
2.0 m.s
1
8.
What is the direction of motion of the object in question 6 above?
Since the velocity is positive, the object is moving to the right.
d.
right
9.
Which of the following statements is
NOT
true of velocity?
d.
Velocity is the same as speed
10.
The position function of a moving object is given by
x = 5t + 10.
which of the following is true about the velocity of this moving
object?
Velocity is the rate of change of the position function.
A graph of position against time will be a straight line and its slope
will be 5, the uniform velocity.
c.
The velocity remains a constant
11.
What is the direction of motion of the object in question 10?
Since the velocity is negative in the xdirection, the object is moving
to the left.
d.
left
12.
What is the speed of the object in question 10?
Speed is the magnitude of the velocity which is 5 ms
1
.
b.
5 m.s
1
3
13.
Which of the following is
NOT
true for an object that moves with
uniform velocity?
An object that moves with uniform velocity has no acceleration and so
statement d is not correct.
d.
Its acceleration is also a constant
14.
Which of the following is true of an object that travels with uniform
acceleration?
b.
A graph of its velocity against time will be a straight line.
15.
Which of the following is the correct graph of displacement against
time for uniformly accelerating object?
For a uniformly accelerating object the graph of position against time
will be concave up.
displacement
time
(a)
16.
Which of the following is the graph of velocity against time for an
object moving with uniform acceleration?
Uniform acceleration is the slope of velocitytime graph.
(b)
velocity
time
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17.
Which of the following is the correct graph for acceleration against
time for a freely falling object?
Acceleration of a freely falling object is a constant and is equal to 9.8
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This note was uploaded on 05/01/2011 for the course PHY 2048 taught by Professor George during the Fall '10 term at Edison State College.
 Fall '10
 George
 Physics, Mass

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