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Physics
UTME / JAMB 2015
Mechanics and Properties of Matter
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
Mechanics and Properties of Matter
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
Mechanics and Properties of Matter
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
Mechanics and Properties of Matter
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
WAEC / WASSCE 2015
Mechanics and Properties of Matter
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
Mechanics and Properties of Matter
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
Mechanics and Properties of Matter
The resultant force in a couple is
A
zero
B
infinite
C
the sum of the forces
D
thr product of the forces
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 #45420)
Physics
WAEC / WASSCE 2015
Mechanics and Properties of Matter
The slope of a straight-line velocity-time graph represents
A
uniform acceleration
B
uniform speed
C
total distance travelled
D
workdone
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 #45421)
Physics
WAEC / WASSCE 2015
Mechanics and Properties of Matter
A body is projected with an initial velocity U at an angle O to the horizontal. The time taken by it to reach its maximum height is given by the expression
A
\(\frac{2u \text{sin}\theta}{g}\)
B
\(\frac{u^2 \text{sin}^2\theta}{2g}\)
C
\(\frac{u \text{sin}\theta}{g}\)
D
\(\frac{u \text{sin}\theta}{2g}\)
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 #45422)
Physics
WAEC / WASSCE 2015
Mechanics and Properties of Matter
Solution
A bullet fired vertically upwards reaches a height of 500m. Neglecting air resistance, calculate the magnitude of the initial velocity of the bullet. [g = 10ms-2]
A
500.0ms-1
B
100.0ms-1
C
70.0ms-1
D
50.0ms-1
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
V2 = U2 + 2gs
V2 = 0
V2 = 2gs
h = 500m
g = 10ms-2
V2 2 x 10 x 500
V2 = 10,000
V = \(\sqrt{10000}\)
V = 100ms-1
Source: Myschool Past Questions Archive (Record #45442)
Physics
WAEC / WASSCE 2015
Mechanics and Properties of Matter
Solution
A body of mass 1000kg is released from a height of 10m above the ground. Determine its kinetic energy just before it strikes the ground .[g = 10ms-2]
A
10J
B
103J
C
104J
D
105J
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Ke = mgh
Ke = Pe
\(\frac{1}{2}\)MV2 = mgh
Ke = 1000 x 10 x 10
Ke = 100000J
Ke = 105J
Source: Myschool Past Questions Archive (Record #45444)
Physics
WAEC / WASSCE 2015
Mechanics and Properties of Matter
Solution
Which of the following units is the S.I. unit of heat capacity?
A
Jkg-1
B
Jkg-1 K-1
C
JK-1
D
Jg-1K-1
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Heat capacity = \(\frac{\text{Heat energy supplied}}{\text{Rise in temperature}}\)
= JK\(^{-1}\)
Source: Myschool Past Questions Archive (Record #45458)
Physics
WAEC / WASSCE 2015
Mechanics and Properties of Matter
The pressure applied to an enclosed fluid to one end id transmitted equally throughout the fluid and to the container walls. This statement is
A
Archimede's principle
B
Bernoulli's principle
C
Pascal's principle Heisenberg's
D
Heisenberg's uncertainty principle
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 #45461)
Physics
WAEC / WASSCE 2015
Mechanics and Properties of Matter
Solution
Water is unsuitable for use as a thermometric liquid because it
A
expands unevenly between 0oC and 40oC
B
has narrow temperature range
C
has a concave meniscus
D
maintains a fixed density
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Water's freezing point is 0^\circC and its boiling point is 100^\circC at standard atmospheric pressure, which provides a limited temperature range for measurement compared to other liquids used in thermometers. Other liquids like mercury can measure a wider range of temperatures.
Source: Myschool Past Questions Archive (Record #45446)
Physics
WAEC / WASSCE 2015
Mechanics and Properties of Matter
Solution
An electric generator rated 12 kW, 2 kV distribute power through a cable of resistance 20\(\Omega\). Calculate the power loss in the cable.
A
120 w
B
360 w
C
720 w
D
2400 w
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Power - IV
I = \(\frac{P}{V}\)
= \(\frac{12000}{2000}\)
I = 6A
Power loss = I\(^2\)R = 6\(^2\) x 20
= 720 W
Source: Myschool Past Questions Archive (Record #45546)