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Physics
UTME / JAMB 2011
Thermal Physics
I. change of state
II. Diffusion
III. Radiation
IV. Osmosis
which of the processes above can be explained using the kinetic theory?
A
I, II,III and IV
B
I, II and III
C
I, III and IV
D
I, II and IV
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 #14432)
Physics
UTME / JAMB 2011
Thermal Physics
Solution
Which of the following materials has an increase in resistance with temperature?
A
water
B
metals
C
wood
D
electrolyte
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Resistance in metals are proportional to temperature
Source: Myschool Past Questions Archive (Record #14466)
Physics
WAEC / WASSCE 2011
Thermal Physics
Which of the following statements about anomalous expansion of water are correct? i. There is contraction between 0oC and 4oC. ii. There is expansion between 0oC and 100oC. iii. The volume is minimum at 4oC. iv. The volume is maximum at 4oC
A
i and ii only
B
ii and iii only
C
i and iii only
D
ii and iv only
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 #35447)
Physics
WAEC / WASSCE 2011
Thermal Physics
Solution
A metal of mass 200g at a temperature of 100oC is placed in 100g of water at 25oC in a container of negligible heat capacity. If the final steady temperature is 30oC, calculate the specific heat capacity of the metal. [specific heat capacity of the water is 4200 Jkg-1 K-1]
A
150 Jkg-1K-1
B
300 Jkg-1K-1
C
320 Jkg-1K-1
D
1960 Jkg-1K-1
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
MC\(\theta\)metal = MC\(\theta _{water}\)
0.2 x C x 70 = 0.1 x 4200 x 5
C = 150
Source: Myschool Past Questions Archive (Record #35454)
Physics
UTME / JAMB 2010
Thermal Physics
Solution
The small droplet of water that forms on the grass in the early hours of the morning is
A
hail
B
dew
C
fog
D
mist
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Dew point is the temperature at which the water vapour present in air is just sufficient to saturate it. Dew is formed when air is cooled below its dew point
Source: Myschool Past Questions Archive (Record #14308)
Physics
WAEC / WASSCE 2010
Thermal Physics
Which of the following properties of a long steel bar would alter if the bar were melted, recast into a cube and allowed to cool to its original temperature?
A
sensity
B
volume
C
specific heat capacity
D
electrical resistance
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 #35245)
Physics
WAEC / WASSCE 2010
Thermal Physics
Solution
a thermometer records 680 mmHg at steam point and 440 mmHg at ice point. The temperature it records at 380 mmHg is
A
-25oC
B
-20oC
C
20oC
D
25oC
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
\(\frac{440 - 380}{680 - 380} = \frac{0 - x}{100 - x}\)
= -25oC
Source: Myschool Past Questions Archive (Record #35295)
Physics
WAEC / WASSCE 2010
Thermal Physics
The advantages of the thermoelectric thermometer include the following characteristics except that it
A
can measure rapidly changing temperatures
B
can measure high and low temperature
C
can measure high and low temperature almost at a point
D
is fairly sensitive
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 #35298)
Physics
WAEC / WASSCE 2010
Thermal Physics
Solution
In a thermos flask, heat loss by radiation is minimizes by the
A
silvered surfaces
B
vacuum within the doubled walls
C
plastic stopper
D
cork support
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
The silvered wall prevents heat loss by radiation. Silver is a poor radiator, and any heat from one wall tends to be reflected back by the other.
Source: Myschool Past Questions Archive (Record #35299)
Physics
WAEC / WASSCE 2010
Thermal Physics
Solution
An electric drill rated 400W is used to drill a hole in copper of mass 400g in 20s. Calculate the rise in temperature if all the heat produced is absorbed by the copper. [specific heat capacity of copper = 400Jkg-1K-1]
A
100oC
B
75oC
C
50oC
D
45oC
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
\(\theta = \frac{Pt}{MC} = \frac{400 \times 20}{0.4 \times 400} = 50^o\)
Source: Myschool Past Questions Archive (Record #35317)
Physics
WAEC / WASSCE 2010
Thermal Physics
Solution
A solid of mass 0.5kg initially at 50oC melts at 60oC. Calculate the quantity of heat required to melt it completely. [specific heat capacity of the solid =2.0KJ kg-1K-1][Specific latent heat of fusion of solid =1.0 KJ kg-1]
A
1500J
B
10000J
C
10500J
D
15000J
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Q = ML + C\(\theta\)
= 0.5 x 1000 + 0.5 x 2000 x 10
= 10500
Source: Myschool Past Questions Archive (Record #35318)
Physics
WAEC / WASSCE 2010
Thermal Physics
Solution
(a) List two examples each of substances with:
(i) low viscosity;
(ii) high viscosity.
(b) When is a liquid said to be viscostatic?
medium Difficulty
Verified Correct Answer: Option
Physical Principles & Numerical Solution
(a)(i) Substances with ions viscosity are: water, ethanol, salt solution, kerosine, methylated spirit, etc.
(ii) Substances with high viscosity: engine oil, glycerine, palm oil, etc.
(b) A liquid is viscostatic when its viscosity does not change appreciably with change in temperature.
Source: Myschool Past Questions Archive (Record #53442)
Physics
WAEC / WASSCE 2009
Thermal Physics
Solution
A faulty thermometer registers 102.5oC t 100oC. If the thermometer has no zero hour, what will it register at 55oC?
A
54.6oC
B
55.0oC
C
56.0oC
D
56.4oC
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
x = \(\frac{102.5 \times 55}{100}\)
= 56.375oC
Source: Myschool Past Questions Archive (Record #35171)
Physics
WAEC / WASSCE 2009
Thermal Physics
Solution
A rod of initial lenght 2m at a temperature of 25oC is heated to 80oC. Calculate the increase in length of the rod if its linear expansivity is 4.0 x 10-3K-1
A
0.26m
B
0.44m
C
0.53m
D
0.84m
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
\(l_2 - l_1 = \alpha l_1 (\theta_2 - \theta_1) = 4.0 \times 10^{-3} \times 2(80 - 25)\)
= 0.44m
Source: Myschool Past Questions Archive (Record #35176)
Physics
WAEC / WASSCE 2009
Thermal Physics
Which of the following factors affect the rate of evaporation of a liquid? i. Exposed surface area ii Temperature of the surroundings iii. Thermal capacity of the liquid iv. Relative humidity of the surroundings
A
ii and iii only
B
ii, iii and iv only
C
i, iii and iv only
D
i, ii amd iv only
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 #35189)