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Physics
NECO SSCE 2003
Mechanics and Properties of Matter
Solution
\(^{226}_{88}Ra\) \(\to\) \(^{222}_{86}Rn\) + X + Energy. The equation above represents a nuclear decay of radium isotope. What is X?
A
Alpha particle
B
Beta particle
C
Gamma ray
D
Neutron
E
X – ray
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
Mass Number: The mass number on the left side is 226 (from Ra) and 222 (from Rn) on the right side. Let A be the mass number of X:
226 = 222 + A ⇒ A = 226 - 222 = 4
Atomic Number: The atomic number on the left side is 88 (for Ra) and 86 (for Rn) on the right side. Let Z be the atomic number of X:
88 = 86 + Z ⇒ 88 - 86 = 2
Therefore, X is an alpha particle.
Source: Myschool Past Questions Archive (Record #42915)
Physics
NECO SSCE 2003
Mechanics and Properties of Matter
Solution
A constant force of 5N acts for 5s on a mass of 5kg initially at rest. Calculate the final momentum of the mass.
A
125 kgms-1
B
75 kgms-1
C
25 kgms-1
D
20 kgms-1
E
5 kgms-1
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
According to Newton's second law of motion, \(force = \frac{ final momentum - initial momentum}{time}\)
but momentum = mass x velocity; F= 5N, Initial mass = 5kg, time = 5secs, initial velocity = zero
then final momentum = force x time (since initial momentum of the mass = 0, that is 5 x 0)
= 5 x 5 = 25 kgms-1
Source: Myschool Past Questions Archive (Record #42920)
Physics
NECO SSCE 2003
Mechanics and Properties of Matter
Solution
A stone is released from a height of 80m above the ground. Calculate its velocity just before it strikes the ground. (g = 10ms\(^{-2}\))
A
25ms-1
B
40 ms-1
C
55 ms-1
D
65ms-1
E
80 ms-1
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Velocity before reaching the ground ( v ) = \(\sqrt{2gH}\) from the third equation of motion.
v = \(\sqrt{2 \times 10 \times 80}\) = \(\sqrt{1600}\) = 40m/s
Source: Myschool Past Questions Archive (Record #42921)
Physics
NECO SSCE 2003
Mechanics and Properties of Matter
The S.l unit of magnetic flux density is
A
farad
B
henry
C
kgm-3
D
tesla
E
weber
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 #42922)
Physics
NECO SSCE 2003
Mechanics and Properties of Matter
Solution
Which of the following motions will be produced by a pair of equal, opposite and non-collinear parallel forces acting on a body?
A
Oscillatory
B
Random
C
Rotational
D
Translational
E
Vibratory
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
A couple consists of two equal and opposite forces acting at a separation, so that net force becomes zero. When a couple acts on a body it rotates the body but does not produce any translational motion. Hence, only rotational motion is produced.
Source: Myschool Past Questions Archive (Record #42925)
Physics
NECO SSCE 2003
Mechanics and Properties of Matter
The space surrounding a magnet in which the magnetic force is exerted is
A
magnetic field
B
magnetic flux
C
magnetic point
D
magnetic pole
E
magnetic strength
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 #42934)
Physics
NECO SSCE 2003
Mechanics and Properties of Matter
The area under the curve of a velocity time graph represents
A
acceleration
B
distance covered
C
instantaneous speed
D
time taken
E
work done
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 #42937)
Physics
NECO SSCE 2003
Mechanics and Properties of Matter
A body is launched from the earth’s surface, of radius R, so that it just escapes from the gravitational influence of the earth; If the gravitational constant is G and the mass of the earth is M, what is the escape velocity of the boby.
A
\(\sqrt{2GM}\) ÷ R
B
\(\frac{\sqrt{2GM}}{R}\)
C
\(\frac{\sqrt{2G}}{MR}\)
D
\(\sqrt{2GMR}\)
E
\(\frac{\sqrt{R}}{2GM}\)
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 #42938)
Physics
NECO SSCE 2003
Mechanics and Properties of Matter
Solution
A ball of mass m moving at velocity u collides with another ball of equal mass at rest. If the two balls move off together after the impact, calculate their common velocity.
A
\(\frac{u}{v}\)
B
\(\frac{u}{2}\)
C
u
D
2u
E
\(\frac{u}{m}\)
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
\(M_1\) = \(M_2\) = M, \(U_1\) = U and \(U_2\) = 0
\(M_1U_1\) + \(M_2U_2\) = V\((M_1 + M_2\))
M x U + M x 0 = V(M+M)= 2MV
MU = 2MV
V = \(\frac{U}{2}\)
Source: Myschool Past Questions Archive (Record #42939)
Physics
NECO SSCE 2003
Mechanics and Properties of Matter
Which of the following statement(s) is/are correct?
I. When a liquid expands its density falls
II. When a mercury-in-glass thermometer is placed in a hot liquid, the mercury level first descends and then rises.
III. The apparent expansion of a liquid is greater than its real expansion.
A
I only
B
II only
C
III only
D
I and II only
E
II and III 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 #42940)
Physics
NECO SSCE 2003
Mechanics and Properties of Matter
The volume of a given mass of gas is 40cm3 at 27° C. What is its volume at 90° C if its pressure remains constant?
A
32.84cm3
B
40.02cm3
C
48.40cm3
D
57.44cm3
E
72.84cm3
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 #42948)
Physics
WAEC / WASSCE 2003
Mechanics and Properties of Matter
Solution
(a) State two objects each used in sports and warfare which may be considered as projectiles.
(b) the horizontal range R, of a projectile is given by the expression;
R = \(\frac{u^2 sin 2\theta}{g}\) where \(\theta\) is the angle of projection, g the acceleration of free fall due to gravity and u the initial velocity. At what value of \(\theta\) will R be maximium?
medium Difficulty
Verified Correct Answer: Option
Physical Principles & Numerical Solution
(a) Projectiles are used in;
(i)Sports as – Shortput, football, javelin etc
(ii) Warfare a bullet, spear,arrow etc.
(b) A R maximum \(\theta\) = 45^\circ
Source: Myschool Past Questions Archive (Record #54014)
Physics
WAEC / WASSCE 2003
Mechanics and Properties of Matter
Solution
(a) Explain diffusion
(b) State one factor that can affect the rate of diffusion.
medium Difficulty
Verified Correct Answer: Option
Physical Principles & Numerical Solution
Diffusion is the tendency of a gas to mix with another and fill an empty space as a result of the constant random motion of the molecules
(b) Factors affecting rate of diffusiom are;
(i) mass
(ii) temperature
(iii) density
Source: Myschool Past Questions Archive (Record #54016)
Physics
WAEC / WASSCE 2003
Mechanics and Properties of Matter
Solution
Explain the rise of water in a glass capillary tube using the kinetic theory.
medium Difficulty
Verified Correct Answer: Option
Physical Principles & Numerical Solution
Glass and water are made up of molecules. The force of attraction between glass molecules and water molecules is stronger than that among water molecules, hence the resultant force acts upwards leading to the rise of water in the glass tube.
Source: Myschool Past Questions Archive (Record #54018)
Physics
WAEC / WASSCE 2003
Mechanics and Properties of Matter
Solution
(a) What is the principle upon which the lighting in fluorescent tubes operate?
(b) State two factors which determine the colour of projection, g the acceleration of free fall due to gravity light from a fluorescent tube
medium Difficulty
Verified Correct Answer: Option
Physical Principles & Numerical Solution
(a)The principles is electric discharge through low pressure gas.
(b) Colour of light is determined by
– Nature of gas in the tube
– Nature of coating inside the tube
Source: Myschool Past Questions Archive (Record #54023)