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Physics
WAEC / WASSCE 2016
Heat Energy & Temperature
Which of the following factors does not affect the e.m.f of a primary cell? Its
A
size
B
internal resistance
C
operating temperature
D
duration of usage
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 #45671)
Physics
WAEC / WASSCE 2016
Heat Energy & Temperature
Diagram
Solution
Two magnets are used to magnetize a soft iron bar PQ as illustrated in the diagram given. The correct polarity at P and Q respectively
Attached Figure / Diagram
A
S and N
B
N and N
C
S and S
D
N and S
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Since the striking poles are both south poles of the magnet, therefore, the polarity of P and Q will be north.
Source: Myschool Past Questions Archive (Record #45673)
Physics
WAEC / WASSCE 2016
Heat Energy & Temperature
In storing magnets, keepers are used to
A
reduced self-demagnetization
B
cancel the effect of the earth's magnetic field
C
protect the magnet from stray electric field
D
increase the strangth of the magnets
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 #45677)
Physics
WAEC / WASSCE 2016
Mechanics and Properties of Matter
Solution
A 10\(\mu\)C charge moves with a velocity of 1.0 x 105 ms-1 at right angle to a uniform magnetic field of flux density 5.0 x 10-4T. Calculate the force on the charge
A
5.0 x 10-5N
B
5.0 x 10-4N
C
5.0 x 105N
D
5.0 x 106N
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
F = qvB
= 10 x 10-6 x 1.0 x 105 x 10-4
= 5.0 x 10-4N
Source: Myschool Past Questions Archive (Record #45678)
Physics
WAEC / WASSCE 2016
Heat Energy & Temperature
Which of the following statements is not correct about steel and soft iron?
A
steel is more magnetized than soft iron
B
permanent magnets are usually made of steel
C
soft iron is more readily magnetized than steel
D
soft iron more readily loses its magnetism than steel
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 #45682)
Physics
WAEC / WASSCE 2016
Heat Energy & Temperature
What determines the polarity at the ends of an electromagnet? The
A
magnitude of the current passing through the wire
B
material of the core of the magnet
C
material of the coil
D
direction of current in the wire
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #45684)
Physics
WAEC / WASSCE 2016
Modern Physics and Nuclear Physics
How many beta particle(s) are emitted in the radioactive decay of \(^{198}_{79}Au \leftarrow ^{198}_{80}Hg\)?
A
1
B
2
C
3
D
5
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 #45687)
Physics
WAEC / WASSCE 2016
Mechanics and Properties of Matter
The phenomenon by which two light atomic nuclear combine to form a heavy nuclide with the release of energy is known as
A
radioactivity
B
nuclear fusion
C
nuclear fission
D
chain reaction
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 #45691)
Physics
WAEC / WASSCE 2016
Mechanics and Properties of Matter
Let \(\Delta\)x be the uncertainty in the measurements of position and \(\Delta\)p the uncertainty in measurement of momentum. The uncertainty principle relation is given as
A
\(\Delta\)x . \(\Delta\)p = h
B
\(\Delta\)x . \(\Delta\)p \(\leq\) = h
C
\(\Delta\)x . \(\Delta\)p \(\geq\) = h
D
\(\Delta\)x . \(\Delta\)p > h
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 #45693)
Physics
UTME / JAMB 2016
Heat Energy & Temperature
Solution
The frequency of beats produced when two tunning forks of frequencies 258Hz and 270Hz are sounded close to each other
A
6Hz
B
264Hz
C
528Hz
D
12Hz
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Beat = f2 - f1 = 270 - 258 = 12Hz
Source: Official Exam / Past Question Archive
Physics
WAEC / WASSCE 2016
Mechanics and Properties of Matter
Solution
State the dimension of; (a) impulse; (ii) acceleration; (iii) work
medium Difficulty
Verified Correct Answer: Option
Physical Principles & Numerical Solution
Quality
Dimensions
a) Impulse
b) Acceleration
c) Work
MLT\(^{-1}\)
LT\(^{-2}\)
ML\(^2\)T\(^{-2}\)
Source: Myschool Past Questions Archive (Record #52943)
Physics
WAEC / WASSCE 2016
Mechanics and Properties of Matter
Solution
A projectile is fired with a velocity of 20 ms\(^{-1}\) at an angle of 40^\circ to the horizontal. Determine the components of the velocity of the projectile at its maximum height.
medium Difficulty
Verified Correct Answer: Option
Physical Principles & Numerical Solution
The components of velocity at maximum height are:
Vy = 0
Vx = UCos \(\theta\) = 20 Cos 40^\circ
=15.32ms\(^{-1}\)
Source: Myschool Past Questions Archive (Record #52946)
Physics
WAEC / WASSCE 2016
Heat Energy & Temperature
Solution
State three different materials that can be used to demonstrate Brownian motion.
medium Difficulty
Verified Correct Answer: Option
Physical Principles & Numerical Solution
Materials used to demonstrate Brownian motion are: Pollen grains, dust particles, smoke particles, potassium permanganate cystals, carbon particles, etc.
Source: Myschool Past Questions Archive (Record #52947)
Physics
WAEC / WASSCE 2016
Mechanics and Properties of Matter
Solution
An electron enters perpendicularly into a uniform magnetic field which has a flux density of 0.12 T This results in a magnetic force of 9.6 x 10\(^{-2}\) N on the electron. Calculate the speed of the electron as it enters the magnetic field. (e =1.6 x \(10^{19}\) C)
medium Difficulty
Verified Correct Answer: Option
Physical Principles & Numerical Solution
F = evB sin \(\theta\)
V = \(\frac{F}{evB sin \theta} = \frac{9.6 \times 10^{12}}{1.6 \times 10^{-19} \times 0.12 sin 90^o}\)
= \(\frac{9.6 \times 10^{-12}}{1.6 x 10^{-19} \times 0.12 \times 1}\)
= 5.0 x 10\(^8 ms{-1}\)
Source: Myschool Past Questions Archive (Record #52948)
Physics
WAEC / WASSCE 2016
Mechanics and Properties of Matter
Solution
List three uses of rockets.
medium Difficulty
Verified Correct Answer: Option
Physical Principles & Numerical Solution
Uses rockets are:
— for space travel
— for space exploration
— for warfare
— for launching of artificial satellites into orbits
— for entertainment, that is fireworks
Source: Myschool Past Questions Archive (Record #52949)