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Physics
UTME / JAMB 2015
Work, Energy, Power & Simple Machines
Solution
Efficiency of a transformer is equal to
A
Efficiency of transformer = (secondary coil ÷ primary coil) × 100%
B
Efficiency of transformer = (mechanical advantage ÷ velocity ratio) × 100%
C
Efficiency of a transformer = (Number of turns in the secondary coil ÷ Number of turns in the primary coil) × 100%
D
Efficiency of a transformer = (power developed in the secondary coil ÷ power supplied to the primary coil) × 100%
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Efficiency of a transformer = (power developed in the secondary coil ÷ power supplied to the primary coil) × 100%
Source: Myschool Past Questions Archive (Record #41324)
Physics
UTME / JAMB 2015
Calorimetry, Latent Heat & Change of State
Solution
Volatile liquids usually
A
Have high boiling points
B
have low boiling points
C
have high densities
D
have high melting points
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Volatile liquids (i.e. Ammonia or Freon) are usually have low boiling point
Source: Myschool Past Questions Archive (Record #41326)
Physics
UTME / JAMB 2015
Reflection, Refraction & Dispersion of Light
Solution
When a man moves toward a plane mirror at a speed of 6m/s, the distance the man and his image increased at a speed of?
A
2 m/s
B
4 m/s
C
12 m/s
D
14 m/s
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Given: Speed of the man (v) = 6 m/s
Distance Calculation:
Distance to the Mirror: As the man moves toward the mirror, the distance between him and the mirror decreases by 6 m/s.
Distance to the Image: The image moves toward the man at the same speed (6 m/s).
Total Change in Distance:
The total distance between the man and his image decreases at the rate of:
Rate of distance change = v + v = 6 m/s + 6 m/s = 12 m/s
Conclusion: The distance between the man and his image increases at a speed of 12 meters per second.
Source: Myschool Past Questions Archive (Record #41329)
Physics
UTME / JAMB 2015
Current Electricity & Electric Circuits
Solution
Which of the following instrument is most accurately for comparing electromotive force (e.m.f) of two cells?
A
Voltmeter
B
Meter rule
C
Galvanometer
D
Potentiometer
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Voltmeter: an instrument for measuring electric potential in volts
Galvanometer: it is a device used to indicate direction of a small electric current
Potentiometer: is a device for measuring or comparing e.m.fs of cells
Meter rule: measuring a distance at different points
Source: Myschool Past Questions Archive (Record #41330)
Physics
UTME / JAMB 2015
Newton's Laws, Momentum & Collisions
Solution
In an inelastic collision
I. Energy is conserved
II. Energy is decreased
III. Energy is increased
IV. Linear momentum conserved
A
I only
B
II and IV only
C
II only
D
III only
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
In an inelastic collision, linear momentum is conserved and energy is decreased
Momentum and kinetic energy are conserved in elastic collision
Source: Myschool Past Questions Archive (Record #41332)
Physics
UTME / JAMB 2015
Current Electricity & Electric Circuits
Solution
The normal temperature of human body is record at what ranges?
A
27°C to 43°C
B
30°C to 40°
C
98.4°C only
D
Between 35°C to 37°C
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
The range of temperature is between 35°C and 43°C but for normal temperature of human body is between the range of 35°C to 37°C respectively
Source: Myschool Past Questions Archive (Record #41335)
Physics
UTME / JAMB 2015
Newton's Laws, Momentum & Collisions
Solution
The property of a body to remain at rest or to continue to move in a straight line is known as
A
force
B
Impulse
C
Energy
D
Inertia
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Inertia: the property of a body that resists any change to its uniform motion, equivalent to its mass
Source: Myschool Past Questions Archive (Record #41337)
Physics
UTME / JAMB 2015
Newton's Laws, Momentum & Collisions
Solution
Momentum and Kinetic energy are conserved in
A
Inelastic collision
B
Elastic collision
C
Explosion
D
Spacecraft
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Momentum and kinetic energy are conversed in elastic collision
Source: Myschool Past Questions Archive (Record #41339)
Physics
UTME / JAMB 2015
Magnetism, Electromagnetism & AC Circuits
Solution
An alternating current with a frequency of 100HZ has a period of
A
0.03sec
B
0.01sec
C
0.04sec
D
0.15sec
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
F = 100HZ, period, T = 1/f = 1/100
= 0.01 sec
The period (T) = 0.01sec
Source: Myschool Past Questions Archive (Record #41340)
Physics
UTME / JAMB 2015
Magnetism, Electromagnetism & AC Circuits
Solution
An alternating current with a frequency of 100HZ has a period of
A
0.03sec
B
0.01sec
C
0.04sec
D
0.15sec
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
F = 100HZ, period, T = 1/f = 1/100
= 0.01 sec
The period (T) = 0.01sec
Source: Official Exam / Past Question Archive
Physics
WAEC / WASSCE 2015
Current Electricity & Electric Circuits
Which of the following statements about mass and weight are correct? i. Weight is the force of gravity on a body. ii. The mass of a body is the quantity of matter in the body. iii. The weight of a body is greatest at the equator. iv. The mass of a body is greatest at the poles
A
i and ii only
B
i and iii only
C
ii and iv only
D
iii and iv only
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 #45415)
Physics
WAEC / WASSCE 2015
Current Electricity & Electric Circuits
Materials that can be stretched and still return to their original forms when the stresses are removed are said be
A
elastic
B
elastomer
C
plastic
D
thermoplastic
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 #45416)
Physics
WAEC / WASSCE 2015
Current Electricity & Electric Circuits
Which of the following units is derived?
A
kg
B
m
C
K
D
N
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 #45417)
Physics
WAEC / WASSCE 2015
Equilibrium of Forces, Moments & Flotation
Solution
The barometric reading at a place is 73.5m Hg. Calculate the pressure at a point 30m below the surface of water contained in a reservoir at the place. [g = 10ms\(^{-2}\), density of mercury = 1.2 x 10\(^4\)kg m\(^{-3}\), density of water = 1.0 x 10\(^3\)m\(^{-3}\)]
A
4.0 x 105 Nm-2
B
3.0 x 10 5 Nm-2
C
2.0 x 105 Nm-2
D
1.0 x 105 Nm-2
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
The pressure at a depth of 30 m below the surface is given by: p = h\(\rho\)g
P = 30 x 1000 x 10 = 3 x 10\(^5\)Nm\(^2\)
Source: Myschool Past Questions Archive (Record #45418)
Physics
WAEC / WASSCE 2015
Current Electricity & Electric Circuits
Solution
An object floats in a fluid when it displaces it's
A
volume of liquid in which it floats
B
mass of fluid in which it foats
C
weith of fluid in which it foats
D
density of fluid in which it foats
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
A floating object displaces a weight of fluid equal to its own weigh
Source: Myschool Past Questions Archive (Record #45419)