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Physics
UTME / JAMB 2013
Electricity and Magnetism
Which of the following obeys ohms laws?
A
electroytes
B
metals
C
diode
D
glass
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option B.
Source: Myschool Past Questions Archive (Record #27362)
Physics
UTME / JAMB 2013
Heat Energy & Temperature
Solution
A house has ten 40W and five 100W bulbs. How much will it cost the owner of the house to keep them lit for 10 hours if the cost of a unit is 5N?
A
N90
B
N50
C
N45
D
N5
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
P = 40 x 10 + 100 x 5
P = 400 + 500 = 900W
Cost = \(\frac{900 \times 10 \times 5}{1000}\)
Cost = N45
Source: Myschool Past Questions Archive (Record #27363)
Physics
UTME / JAMB 2013
Electricity and Magnetism
Solution
An electric device is rated 2000W, 250V. Calculate the maximum current it can take
A
9A
B
8A
C
7A
D
6A
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
I = \(\frac{P}{v}\)
I = \(\frac{2000}{250}\)
I = 8A
Source: Myschool Past Questions Archive (Record #27364)
Physics
UTME / JAMB 2013
Mechanics and Properties of Matter
When a charge moves through an electric circuit in the direction of an electric force, it
A
gains both potential and kinetic energy
B
gains potential energy and lose kinetic energy
C
loses potential energy and gains kinetic energy
D
loses both potential and kinetic energy
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option C.
Source: Myschool Past Questions Archive (Record #27365)
Physics
UTME / JAMB 2013
Electricity and Magnetism
Solution
To convert a galvanometer to a voltmeter, a
A
high resistance is connected to it in series
B
high resistance is connected to it in parallel
C
low resistance is connected to it in parallel
D
low resistance is connected to it in series
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
To convert a galvanometer (which measures current) into a voltmeter (which measures voltage), a high resistance is connected in series with the galvanometer. This limits the current flowing through the galvanometer, allowing it to measure higher voltages without exceeding its maximum current rating.
Source: Myschool Past Questions Archive (Record #27366)
Physics
UTME / JAMB 2013
Heat Energy & Temperature
Induced emfs are best explained using
A
Ohm's law
B
Faraday's law
C
Colomb's law
D
Lenz's law
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option B.
Source: Myschool Past Questions Archive (Record #27367)
Physics
UTME / JAMB 2013
Electricity and Magnetism
Solution
If a current of 2.5A flows through an electrolyte for 3 hours and 1.8g of a substance is deposited, what is the mass of the substance that will be deposited if a current of 4A flows through it for 4.8 hours?
A
2.4g
B
3.2g
C
4.6g
D
4.8g
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
First let's find z
z = \(\frac{M}{It}\)
z = \(\frac{1.8}{2.5 \times (3 \times 60 \times 60)}\)
Therefore, the new M equals
M = zIt
M = \(\frac{1.8 \times 4 \times 4.8 \times 60 \times 60}{2.5 \times 3 \times 60 \times 60}\)
M = 4.6g
Source: Myschool Past Questions Archive (Record #27368)
Physics
UTME / JAMB 2013
Mechanics and Properties of Matter
Solution
Calculate the energy of the third level of an atom if the ground state energy is - 24.8eV
A
-9.20eV
B
-8.20eV
C
-2.75eV
D
-1.75eV
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
\(E_3 = \frac{E}{n^2}\)
\(E_3 = \frac{-24.8}{3^2}\)
\(E_3 = 2.75eV\)
Source: Myschool Past Questions Archive (Record #27369)
Physics
UTME / JAMB 2013
Waves and Optics
The particle nature of light is demonstrated by the
A
photoelectric effect
B
speed of light
C
colours of light
D
diffraction of light
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option A.
Source: Myschool Past Questions Archive (Record #27371)
Physics
UTME / JAMB 2013
Mechanics and Properties of Matter
Solution
The energy of a photo having a wavelength of 10-10m is
(h= 6.63 x 10 -34Js, c =3.0 x 10 8ms-1)
A
2.0 x 10 -15J
B
1.7 x 10 -13J
C
2.0 x 10 -12J
D
1.7 x 10 -12J
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
E = \(\frac{hc}{\lambda}\)
E = \(\frac{6.63 \times 10^{-34} \times 3 \times 10^18}{10^{-10}}\)
E = 2 x 10-15J
Source: Myschool Past Questions Archive (Record #27372)
Physics
UTME / JAMB 2013
Heat Energy & Temperature
The bond between silicon and germanium is
A
dative
B
covalent bond
C
trivalent
D
ionic
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option B.
Source: Myschool Past Questions Archive (Record #27373)
Physics
UTME / JAMB 2013
Heat Energy & Temperature
The bond between silicon and germanium is
A
dative
B
covalent bond
C
trivalent
D
ionic
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option B.
Source: Official Exam / Past Question Archive
Physics
WAEC / WASSCE 2013
Mechanics and Properties of Matter
Solution
A body of mass 2kg is released from rest on a plane inclined at an angle of 60^\circ to the horizontal. Calculate the acceleration of the body down the plane.[g = 10ms\(^{-2}\)]
A
3.1ms-2
B
5.2ms-2
C
6.0ms-2
D
8.7ms-2
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
a = g sin \(\theta\)
= 10 sin 60
= 8.7 ms\(^{-2}\)
Source: Myschool Past Questions Archive (Record #35654)
Physics
WAEC / WASSCE 2013
Mechanics and Properties of Matter
Solution
The total area under a force-velocity graph represents
A
energy
B
momentum
C
power
D
pressure
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Power = Force x Velocity.
Therefore, the area under the force- velocity graph gives Power.
Source: Myschool Past Questions Archive (Record #35656)
Physics
WAEC / WASSCE 2013
Mechanics and Properties of Matter
Solution
A body of mass 20g projected vertically upwards in vacuum returns to the point of projection after 1.2s. [g = 10ms\(^{-2}\)]. Calculate the speed of projection
A
1.2ms-1
B
6.0ms-1
C
12.0ms-1
D
0.6ms-1
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
To find the speed of projection, we can use the formula for the time of flight of an object projected vertically upwards:
\(t = \frac{2u}{g}\)
where:
- \( t \) is the total time of flight (1.2 s),
- \( u \) is the initial speed of projection,
- \( g \) is the acceleration due to gravity (10 m/s²).
Rearranging the formula to solve for \( u \):
\(u = \frac{gt}{2}\)
Substituting the values:
\(u = \frac{10 \, \text{m/s}^2 \times 1.2 \, \text{s}}{2} = \frac{12}{2} = 6 \, \text{m/s}\)
Thus, the speed of projection is \( 6 \, \text{m/s} \).
Source: Myschool Past Questions Archive (Record #35658)