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Physics
UTME / JAMB 1986
Thermal Physics
Diagram
In an experiment in which molten naphthalene is allowed to cool, the cooling curve in fig 5 was obtained, the temperature \( 80^{\circ}C \) is known as
Attached Figure / Diagram
A
cooling temperature
B
boiling point
C
melting point
D
vaporization point
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 #41654)
Physics
UTME / JAMB 1985
Thermal Physics
Solution
Two liquids, P at a temperature of 20oC and Q at a temperature of 80oC have specific heat capacities of 1.0Jkg-1oC-1 and 1.5J kg-1 oC-1respectively. if equal masses of P and Q are mixed in a lagged calorimeter, then the equilibrium temperature is
A
44oC
B
50oC
C
56oC
D
60oC
E
70oC
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Heat lost = heat gained
m x (80 - \(\theta\)) x 1.5 = m x (\(\theta\) - 20) x 1
\(\theta\) = 56oC
Source: Myschool Past Questions Archive (Record #28585)
Physics
UTME / JAMB 1985
Thermal Physics
Solution
Two thermo flasks of volume Vx and Vy are filled with liquid water at an initial temperature of 0oC. After sometime the temperature were found to be 9x, 9y, respectively. Given that \(\frac{Vx}{Vy}\) = 2 and \(\frac{\theta x}{\theta y}\) = \(\frac{1}{2}\) the ratio of the heat flow into the flask is
A
\(\frac{1}{4}\)
B
\(\frac{1}{2}\)
C
4
D
1
E
2
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Heat = mc\(\theta\)
Hx = Dx x Vx x Cx x \(\theta\)x
Hy = Dy x Vy x Cy x \(\theta\)y
\(\frac{H_x}{H_y}\) = \(\frac{D_x \times V_x \times C_x \times \theta_x}{D_x \times V_x \times C_x \times \theta_x}\)
= 2 x \(\frac{1}{2}\)
= 1
Source: Myschool Past Questions Archive (Record #28608)
Physics
UTME / JAMB 1985
Thermal Physics
Solution
A good calorimeter should be of
A
low specific heat capacity and low heat conductivity
B
low specific heat capacity and high heat conductivity
C
high specific heat capacity and high heat conductivity
D
high specific heat capacity and low heat conductivity
E
dull surface and low heat conductivity
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
High Specific Heat Capacity: This allows the calorimeter to absorb a significant amount of heat without a large increase in temperature, ensuring accurate measurements of heat transfer.
Low Heat Conductivity: This minimizes heat loss to or gain from the surroundings, helping to maintain the integrity of the temperature measurements.
Source: Myschool Past Questions Archive (Record #28611)
Physics
UTME / JAMB 1984
Thermal Physics
Solution
Dewpoint is the temperature at which, water vapour in the atmosphere
A
turns into steam
B
solidifies into ice pellets
C
first condenses into liquid form
D
is just sufficient to cause cooling
E
has a relative humidity of fifty percent
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Dew point is the temperature at which the air becomes fully saturated with water vapour. At this temperature, the water vapour in the atmosphere starts to condense into tiny liquid water droplets
Source: Myschool Past Questions Archive (Record #28696)
Physics
UTME / JAMB 1984
Thermal Physics
Solution
The lower and upper fixed points marked on a mecury-in-glass thermometer are 210mm apart. The end of the mercury column in the tube is 49mm above the lower fixed point in a room. What is the temperature of the room in degrees Celsius?
A
55.3oC
B
23.3oC
C
49.0oC
D
16.1oC
E
76.7oC
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
210mm .... 100oC
49mm .... \(\theta\)
0mm .... 0oC
\(\frac{49 - 0}{210 - 0}\) = \(\frac{\theta - 0}{100 - 0}\)
\(\frac{49}{210}\) = \(\frac{\theta}{100}\)
\(\theta\) = 23.3oC
Source: Myschool Past Questions Archive (Record #28697)
Physics
UTME / JAMB 1984
Thermal Physics
Which of the following properties of matter CANNOT be utilized for temperature measurement? The
A
length of a liquid column
B
volume of a gas at constant pressure
C
pressure of a gas at constant volume
D
resistance of a metallic wire
E
current produced in a photoelectric effect
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 #28717)
Physics
UTME / JAMB 1983
Thermal Physics
A short response to time is obtained in liquid-in-glass thermometer when the
A
bulb is large and thick-walled
B
stem is long and thin
C
bulb is small and thicked-walled
D
liquid is of high density and the bore is large
E
bulb is thin-walled and the liquid is a good conductor of heat
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 #28866)
Physics
UTME / JAMB 1982
Thermal Physics
Which of the following statements is NOT true? Thermostats are used to control the temperature of
A
pressure cookers
B
laundry irons
C
hot water storage tanks
D
aquaria for tropical fish
E
heated apartments
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 #28905)
Physics
UTME / JAMB 1982
Thermal Physics
250g of lead at 170oC is dropped into 100g of water at 0oC. If the final temperature is 12oC, the specific heat of lead is (specific heat of water is 4,200J/kgoC)
A
39.5J/kgoC
B
50.4J/kgoC
C
127.6J/kgoC
D
154.6J/kgoC
E
173.4J/kgoC
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 #28909)
Physics
UTME / JAMB 1982
Thermal Physics
Solution
A rod of length 10cm is heated through 100oC and its final length is 10.26cm. What is the co-efficient of linear expansion of the rod?
A
0.026 per degree centigrade
B
0.00026 per degree centigrade
C
0.26 per degree centigrade
D
1.0026 per degree centigrade
E
0.0026 per degree centigrade
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
\(\alpha\) = \(\frac{L_2 - L_1}{L_1 \times \theta}\)
= \(\frac{10 - 26 - 10}{10 \times 100}\)
= 2.6 x 10-4oC
Source: Myschool Past Questions Archive (Record #28922)
Physics
UTME / JAMB 1981
Thermal Physics
Solution
The ice and steam points of mercury-in-glass thermometer of centigrade scale and of uniform bore correspond respectively to 3cm and 19cm lengths of the mercury thread when the length is 12cm, the temperature is
A
32oC
B
48oC
C
56oC
D
65oC
E
75oC
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
steam point - ice point in oC = 100oC - 0oC
= 19cm - 3cm = 16cm
12cm - 3cm = 9cm
\(\frac{9}{16}\) x 100oC = 56.25oC
= 56oC
Source: Myschool Past Questions Archive (Record #28948)
Physics
UTME / JAMB 1981
Thermal Physics
The latent heat of fusion of a substance is the heat required to
A
raise the temperature of unit mass of the substance by 1 oC
B
maintain unit mass of the substance at constant temperature
C
change unit mass of substance from solid to liquid at constant temperature
D
change unit mass of liquid to vapour at constant temperature
E
raise the temperature of unit mass by 100oC
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 #28966)
Physics
UTME / JAMB 1981
Thermal Physics
Heat may be transferred by conduction, convection and radiation. By which of these methods does heat travel through vacuum?
A
conduction only
B
convection only
C
radiation only
D
non of these methods
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 #28981)
Physics
UTME / JAMB 1981
Thermal Physics
Solution
Which type of radiation does not NOT originate within the nucleus?
A
alpha
B
beta
C
gamma
D
neutron
E
x-rays
medium Difficulty
Verified Correct Answer: Option E
Physical Principles & Numerical Solution
x rays are emitted from processes outside the nucleus
Source: Myschool Past Questions Archive (Record #29014)