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Physics
WAEC / WASSCE 1997
Current Electricity & Electric Circuits
Whenever light waves are restricted to a specific plane they are said to be
A
Diffracted
B
Refracted
C
Diffused
D
Regularly reflected
E
Plane polarized
medium Difficulty
Verified Correct Answer: Option E
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option E.
Source: Myschool Past Questions Archive (Record #26300)
Physics
WAEC / WASSCE 1997
Atomic, Quantum, Nuclear Physics & Electronics
Solution
A solid material of volume 100\(cm^{-3}\) is heated through a temperature difference of 40°C. Calculate the increase in the volume of the material if its linear expansitivity is 2 x \(10^{-6}K{-1}\)
A
2.4 x\(10^{-2}cm^{-3}\)
B
1.6 x\(10^{-2}cm^{-3}\)
C
8 x\(10^{-2}cm^{-3}\)
D
5 x\(10^{-2}cm^{-3}\)
E
4 x\(10^{-2}cm^{-3}\)
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
\(3{\alpha}= \frac{\Delta{V}}{V_1\Delta{T}}\Rightarrow \frac{\Delta{V}}{100\times40}=3\alpha\, where\, \alpha = 2 \times 10^{-6}\\ \frac{\Delta{V}}{4000}=6\times10^{-6}\Rightarrow \Delta=4\times10^3\times6\times10^{-6}= 2.4\times10^{-2}cm^{-3}\)
Source: Myschool Past Questions Archive (Record #26301)
Physics
WAEC / WASSCE 1997
Calorimetry, Latent Heat & Change of State
Solution
Calculate the quantity of heat released when 100g of steam at 100°C condenses to water(Take the specific latent heat of vaporization of water as 2.3x \(10^6Jkg^{-1}\))
A
2.3x\(10^{1}J\)
B
2.3x\(10^{2}J\)
C
2.3x\(10^{4}J\)
D
2.3x\(10^{5}J\)
E
3.3x\(10^{7}J\)
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
\(\Delta{H}=mL=0.1\times2.3\times10^6=2.3\times10^5\)J
Source: Myschool Past Questions Archive (Record #26302)
Physics
WAEC / WASSCE 1997
Current Electricity & Electric Circuits
Solution
A fixed mass of gas occupies a volume of 20\(cm^3\) at a fixed pressure of 700mmHg. Assuming that the temperature remains constant, what will be the volume of the gas at 750mmHg?
A
2.5\(cm^3\)
B
15.5\(cm^3\)
C
18.7\(cm^3\)
D
21.4\(cm^3\)
E
72.5\(cm^3\)
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
\(v_2=\frac{v_1p_1}{p_2}=\frac{20\times700}{750}=18.66=18.7cm^3\)
Source: Myschool Past Questions Archive (Record #26303)
Physics
WAEC / WASSCE 1997
Lenses & Optical Instruments
Solution
A converging lens of focal length 15cm is used to obtain a real image magnified \(1\frac{1}{2}\) times. Calculate the distance of the image from the lens?
A
37.5cm
B
22.5cm
C
15cm
D
7.5cm
E
3.3cm
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
If u=x, v = \(1\frac{1}{2}x \Rightarrow if u= 2x,v=3x\\
\frac{1}{f}=\frac{1}{u}+\frac{1}{v}; \frac{1}{15}=\frac{1}{2x}+\frac{1}{3x} \times \frac{5}{6}\\
X=\frac{75}{76}=12.5, v=3x=12.5\times 3=37.5\)
Source: Myschool Past Questions Archive (Record #26304)
Physics
WAEC / WASSCE 1997
Calorimetry, Latent Heat & Change of State
Solution
A cup containing 100g of pure water at 20°C is placed in a refrigerator. If the refrigerator extracts heat at a rate of 840J per minute, calculate the time taken for the water to freeze. Neglect the heat capacity of the material of the cup. (Specific heat capacity of water =4.2J\(g^{-1}K^{-2}\))((Specific latent heat fusion of water =336J\(g^{-1}\)
A
15minutes
B
20 minutes
C
42 minutes
D
50 minutes
E
84 minutes
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
H=pt =mL +mcθ ; 840t= 100x336+100x4.2x20 thus t=420000/840=50minutes
Source: Myschool Past Questions Archive (Record #26305)
Physics
WAEC / WASSCE 1997
Waves, Sound & Vibrations
Solution
What is the frequency of a radio wave of wavelength 150m if the velocity of radio waves in free space is 3 x \(10^8ms^{-1}\)?
A
4.5 x \(10^{10}\)Hz
B
5x \(10^{9}Hz\)
C
4.5 x \(10^{8}Hz\)
D
2 x \(10^{7}Hz\)
E
2 x \(10^{6}Hz\)
medium Difficulty
Verified Correct Answer: Option E
Physical Principles & Numerical Solution
V=f\(\lambda, f =\frac{v}{\lambda}= \frac{3\times10^8}{150}\Rightarrow 2\times10^6\)Hz
Source: Myschool Past Questions Archive (Record #26306)
Physics
WAEC / WASSCE 1997
Work, Energy, Power & Simple Machines
Which of the following statements about kinetic theory of matter is not correct?
A
The molecules of matter are always in motion
B
When a body is heated the average kinetic energy of its molecules decreases
C
Molecules of a liquid move more freely than those of a solid
D
Matter is made up of very tiny particles called molecules
E
The molecules of a gas move more freely than those of a liquid
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 #26307)
Physics
WAEC / WASSCE 1997
Current Electricity & Electric Circuits
Which of the following is not correct about the Rutherford’s model of an atom?
A
The mass of an atom is concentrated around the nucleus
B
The nucleus of an atom is positively charged
C
The nucleus is surrounded by the electron cloud
D
The model is applicable to atoms with only one electron in the outer shell
E
The diameter of the nucleus is \(10^{-15}m\)
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 #26308)
Physics
WAEC / WASSCE 1997
Elasticity, Density, Pressure & Fluids
The ratio of tensile stress to tensile strain is known as
A
Modulus of integrity
B
Modulus of elasticity
C
Shear modulus
D
Bulk modulus
E
Young’s modulus
medium Difficulty
Verified Correct Answer: Option E
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option E.
Source: Myschool Past Questions Archive (Record #26309)
Physics
WAEC / WASSCE 1997
Atomic, Quantum, Nuclear Physics & Electronics
Which of the following statements is not true of nuclear fission?
A
Mother nucleus is broken into two daughter nuclei of roughly equal parts
B
Neutron is normally used in bombarding heavy nucleus
C
Two light nuclei are made to combine to form a heavy nucleus
D
Very enormous energy is released
E
There is an apparent loss of mass
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 #26310)
Physics
WAEC / WASSCE 1997
Elasticity, Density, Pressure & Fluids
When a paint brush is removed from clean water, the bristles of the brush are pulled together because of
A
The viscosity of the surrounding air
B
The low density of water
C
Surface tension forces
D
The weight of the brush bristles
E
The mass of the brush bristles
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 #26311)
Physics
WAEC / WASSCE 1997
Atomic, Quantum, Nuclear Physics & Electronics
Solution
The half-life of a radioactive material is 6hrs. What quantity of 1kg of the material would decay in 24 hours?
A
\(\frac{15}{16}\)kg
B
\(\frac{1}{2}\)kg
C
\(\frac{1}{4}\)kg
D
\(\frac{1}{8}\)kg
E
\(\frac{1}{6}\)kg
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
To determine the quantity of a 1 kg radioactive material that decays in 24 hours, given a half-life of 6 hours:
The number of half-lives in 24 hours is:
\(\text{Number of half-lives} = \frac{24 \text{ hours}}{6 \text{ hours/half-life}} = 4\)
The remaining quantity after 4 half-lives is:
\(\text{Remaining quantity} = 1 \text{ kg} \times \left( \frac{1}{2} \right)^4 = 1 \text{ kg} \times \frac{1}{16} = \frac{1}{16} \text{ kg}\)
The decayed quantity is: \(\text{Decayed quantity} = 1 \text{ kg} - \frac{1}{16} \text{ kg} = \frac{15}{16} \text{ kg}\)
Thus, the quantity that decayed in 24 hours is: \(\frac{15}{16} \text{ kg}\)
Source: Myschool Past Questions Archive (Record #26312)
Physics
WAEC / WASSCE 1997
Elasticity, Density, Pressure & Fluids
The odor of a leaking gas is perceived at a distance from the source. This is made possible by the process of
A
Sublimation
B
Diffusion
C
Osmosis
D
Evaporation
E
Capillarity
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 #26313)
Physics
WAEC / WASSCE 1997
Magnetism, Electromagnetism & AC Circuits
Lenz’s law of electromagnetic induction is essentially a statement of the
A
Inverse square law of gravitation
B
Inverse square law of magnetism
C
Inverse square law of electrostatics
D
Law of conservation of momentum
E
Law of conservation of energy
medium Difficulty
Verified Correct Answer: Option E
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option E.
Source: Myschool Past Questions Archive (Record #26314)