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Physics
UTME / JAMB 1991
Heat Energy & Temperature
Solution
A boy timed 30 oscillations of a certain pendulum thrice and obtained 1min. 10s, 1min. 12s and 1min. 7s respectively.The mean period of oscillation of the pendulum is
A
0.14s
B
0.43s
C
2.32s
D
6.97s
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Total time = (3 x 60) + 29
= 209sec
period \(\frac{t}{n}\) = \(\frac{209}{90}\)
= 2.32sec
Source: Myschool Past Questions Archive (Record #28184)
Physics
UTME / JAMB 1991
Heat Energy & Temperature
The image in a pin-hole camera is
A
errect and formed by refraction through a lens
B
virtual and formed by dispersion
C
erect and gets sharper as the hole becomes larger
D
inverted and formed by the light from each point travelling in a straight line
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 #28186)
Physics
UTME / JAMB 1991
Heat Energy & Temperature
Solution
A trough 12.0cm deep is filled with water of refractive index \(\frac{4}{3}\). By how much would a coin at the bottom of the trough appear to be displaced when viewed vertically from above the water surface?
A
3.0cm
B
6.0cm
C
9.0cm
D
16.0cm
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
\(\frac{4}{3}\) = \(\frac{12}{\text {Apparent depth}}\)
Apparent depth = 9cm
Height by which coin is raised = 12 - 9
= 3cm
Source: Myschool Past Questions Archive (Record #28188)
Physics
UTME / JAMB 1991
Heat Energy & Temperature
The function of the system of granulated carbon mixed with manganese (IV) oxide in a Letanche cell is to
A
increase the e.m.f. of the cell to 2.0V
B
prevent local action in the cell
C
prevent polarisation in the cell
D
make the cell black and hence a good radiator
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 #28197)
Physics
UTME / JAMB 1991
Heat Energy & Temperature
Solution
In the above circuit, The fuse wire melts when
A
K is Opened
B
K is closed
C
the 14 ohm resistor is doubled with k closed
D
the 6 ohm resistor is doubled with k closed
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
K is closed: This is when the current exceeds the 2 A rating of the fuse, causing it to melt.
Source: Official Exam / Past Question Archive
Physics
WAEC / WASSCE 1991
Heat Energy & Temperature
Which of the following is a fundamental quantity?
A
speed
B
density
C
lenght
D
impulse
E
energy
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 #33189)
Physics
WAEC / WASSCE 1991
Heat Energy & Temperature
Solution
The boiling point of a liquid depends on the following except the
A
nature of the liquid
B
external pressure
C
volume of the liquid
D
impurities present in the liquid
E
degree of it's molecular cohesive force
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
The volume of the liquid does not affect the boiling point.
Source: Myschool Past Questions Archive (Record #33295)
Physics
WAEC / WASSCE 1991
Heat Energy & Temperature
Solution
a tap supplies water at 26oC while another supplies water at 82oC. If a man wishes to bathe with water at 40oC the ratio of hot mass of hot water to that of cold water required is
A
1:3
B
3:1
C
3:7
D
7:3
E
15:8
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
heat supplied by hot water = heat gained by cold water M1C(82 - 40) = M2C(40 - 26)
\(\frac{M_2}{M_1}\)= \(\frac{14}{42}\)
= 1: 3
Source: Myschool Past Questions Archive (Record #33307)
Physics
WAEC / WASSCE 1991
Heat Energy & Temperature
Melting ice cools an orange drink far better than the same mass of ice-cold water because
A
melting ice is lower temperature than ice-cold water
B
water has a higher specific heat than ice
C
ice floats and cools the air above the drink
D
ice absorbs latent heat during melting
E
ice makes better thermal contact than water
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 #33312)
Physics
WAEC / WASSCE 1991
Heat Energy & Temperature
Solution
An orange fruit drops to the ground from the top of a tree 45m tall. How long does it takes to reach the ground? (g = 10ms-2)
A
3.0s
B
4.5s
C
6.0s
D
7.5s
E
9.0s
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
s = ut + \(\frac{1}{2}gt^2\)
45 = 0 + 5t2
t = 3s
Source: Myschool Past Questions Archive (Record #33202)
Physics
WAEC / WASSCE 1991
Heat Energy & Temperature
Diagram
Solution
The diagram represents a block-and-tackle pulley system on which an effort of 50N is just able to lift a load of weight W. If the efficiency of the machine is 40%. find the value of W
Attached Figure / Diagram
A
300N
B
200N
C
140N
D
120N
E
20N
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Eff = \(\frac{MA}{VR}\) x 100%
40 = \(\frac{MA}{60}\)
MA = 240
\(\frac{L}{E} = \frac{240}{100}\)
W = L = \(\frac{240}{100}\) x 50
= 120N
Source: Myschool Past Questions Archive (Record #33211)
Physics
WAEC / WASSCE 1991
Heat Energy & Temperature
A boatman facing north wants to cross a flowing river to a point directly opposite its position at the other bank. If the river is flowing eastwards, in what direction should he row his boat?
A
west
B
east
C
north-west
D
north-east
E
south-west
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 #33215)
Physics
WAEC / WASSCE 1991
Heat Energy & Temperature
what part of the camera corresponds to the iris of the eye?
A
shutter
B
film
C
lens
D
diaphram
E
focusing ring
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 #33409)
Physics
WAEC / WASSCE 1991
Heat Energy & Temperature
What type of motion does the skin of a talking drum perform when its being struck with the drum stick?
A
random
B
rational
C
vibratory
D
translational
E
circular
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 #33413)
Physics
WAEC / WASSCE 1991
Heat Energy & Temperature
Diagram
Solution
Calculate the refractive index of the material of the glass block shown in the diagram if YZ = 4cm
Attached Figure / Diagram
A
0.40
B
0.60
C
1.50
D
1.67
E
2.50
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
n = \(\frac{\text{real depth}}{\text {apparent depth}}\)
\(\frac{10}{10^{-4}}\) = 1.6
Source: Myschool Past Questions Archive (Record #33401)