1. When a voltage V of 12.2 V is
applied to a DC motor, the current I in the motor is 0.20 A. Which one
of the following is the output power VI of the motor given to the
correct appropriate number of significant digits?
A. 2 W
B. 2.4 W
C. 2.40 W
D. 2.44 W
2.Which
one of the following lists a fundamental unit and a derived unit?
|
A.
|
ampere
|
second
|
|
B.
|
coulomb
|
kilogram
|
|
C.
|
coulomb
|
newton
|
|
D.
|
metre
|
kilogram
|
3.A
student measures the current in a resistor as 677 mA for a potential difference
of 3.6 V. A calculator shows the resistance of the resistor to be 5.3175775 Ω.
Which one of the following gives the resistance to an appropriate number
of significant figures?
A. 5.3 Ω
B. 5.32 Ω
C. 5.318 Ω
D. 5.31765775 Ω
4.Which
one of the following is a vector quantity?
A. Electric power
B. Electrical resistance
C. Electric field strength
D. Electric potential difference
5.The
diameter of a proton is of the order of magnitude of
A. 10–12 m.
B. 10–15 m.
C. 10–18 m.
D. 10–21 m.
6.Which
one of the following is a scalar quantity?
A. Pressure
B. Impulse
C. Magnetic field strength
D. Weight
7.The
resistive force F acting on a sphere of radius r moving at speed v
through a liquid is given by
F
= cvr
where c is a constant. Which of
the following is a correct unit for c?
A. N
B. N s–1
C. N m2 s–1
D. N m–2 s
8 Which
one of the following contains three fundamental units?
|
A.
|
Metre
|
Kilogram
|
Coulomb
|
|
B.
|
Second
|
Ampere
|
Newton
|
|
C.
|
Kilogram
|
Ampere
|
Kelvin
|
|
D.
|
Kelvin
|
Coulomb
|
Second
|
9.The
kWh is equal to
A. 1.0 × 103 J.
B. 3.6 × 103 J.
C. 6.0 × 104 J.
D. 3.6 × 106 J.
10.Which
one of the following measurements is stated correctly to two significant
digits?
A. 0.006 m
B. 0.06 m
C. 600 m
D. 620 m
11.Sub-multiples
of units may be expressed using a prefix. Which one of the following
lists the prefixes in decreasing order of magnitude?
|
A.
|
centi-
|
micro-
|
milli-
|
nano-
|
|
B.
|
milli-
|
centi-
|
nano-
|
micro-
|
|
C.
|
centi-
|
milli-
|
micro-
|
nano-
|
|
D.
|
milli-
|
micro-
|
centi-
|
nano-
|
12.Which
one of the following includes three vector quantities?
|
A.
|
velocity
|
weight
|
field
strength
|
|
B.
|
weight
|
mass
|
field
strength
|
|
C.
|
velocity
|
energy
|
weight
|
|
D.
|
mass
|
energy
|
field
strength
|
13.The
length of a page of the examination paper is approximately 30 cm.
A. 10–7 s
B. 10–8 s
C. 10–9 s
D. 10–10 s
14.The
mass of a body is measured to be 0.600 kg and its acceleration to be 3 m s–2.
The net force on the body, expressed to the correct number of significant
figures is
A. 1.8 N.
B. 1.80 N.
C. 2 N.
D. 2.0 N.
15.The
kilowatt-hour (kW h) is equivalent to
A. 6.0×104 J .
B. 6.0×104W .
C. 3.6×106 J .
D. 3.6×106W .
16.Which
of the following contains three scalar quantities?
|
A.
|
mass
|
charge
|
speed
|
|
B.
|
density
|
weight
|
mass
|
|
C.
|
speed
|
weight
|
charge
|
|
D.
|
charge
|
weight
|
density 17.The
order of magnitude of the weight of an apple is
|
A. 10–4 N.
B. 10–2 N.
C. 1 N.
D. 102 N.
