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Physics
UTME / JAMB 1992
Heat Energy & Temperature
Solution
PQRS is rectangular cell with PQ perpendicular to the magnetic field as shown above. If a current flows in the the direction PQRS in what direction will the coil move
A
Upwards
B
Downwards
C
TOwards The North Pole
D
Towards The South Pole
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
The direction of the force is determined by Fleming's left-hand rule:
Field (Forefinger): N to S (right to left).
Current (Middle finger): P to Q (downwards).
Force (Thumb): When aligning fingers as described, the thumb points upwards.
This force acts on the segment PQ, causing the initial upward movement.
Source: Official Exam / Past Question Archive
Physics
UTME / JAMB 1992
Heat Energy & Temperature
Solution
What is the least possible error in using a rule graduated in centimeters?
A
0.1cm
B
0.5cm
C
1.0cm
D
2.0cm
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
A rule (ruler) graduated in centimeters has markings every 1 cm. The least possible error (also called the uncertainty or instrument error) is half the smallest division on the scale.
Smallest division = 1 cm
Least possible error = \(\frac{1}{2}\) \times 1 cm = 0.5 cm
Source: Myschool Past Questions Archive (Record #28037)
Physics
UTME / JAMB 1992
Heat Energy & Temperature
One of the most important applications of bi-metallic strip is found in the construction of
A
a thermostat
B
an altimeter
C
a thermocouple
D
a hydrometer
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 #28061)
Physics
UTME / JAMB 1992
Heat Energy & Temperature
A block of ice floats on water inside a container. If the block of ice gets completely melted, the level of water in the container will
A
increase
B
remain the same
C
decrease
D
first decrease and then increase
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 #28067)
Physics
UTME / JAMB 1992
Heat Energy & Temperature
The space between the double glass walls of a thermos flask is evacuated space are silvered. The residual source of heat loss takes place by
A
convection
B
radiation from the surface
C
conduction through the stopper and the glass
D
conduction across the walls
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 #28068)
Physics
UTME / JAMB 1992
Heat Energy & Temperature
Which of the following statements is CORRECT about a long-sighted boy who does not put on glasses?
A
He cannot see distant objects clearly
B
Rays of light from a close object are focused in front of his retina
C
His eye ball is too long
D
Parallel rays of light are focused behind his retina
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 #28087)
Physics
UTME / JAMB 1992
Heat Energy & Temperature
Solution
If the refractive index of a medium in air is 2.0, what is the critical angle for this medium?
A
30o
B
42o
C
45o
D
50o
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
sin c = \(\frac{1}{n}\) = \(\frac{1}{2}\)
c = sin-1\((\frac{1}{n})\)
= 30o
Source: Myschool Past Questions Archive (Record #28094)
Physics
UTME / JAMB 1992
Heat Energy & Temperature
Solution
Which of the following apparatus will require the smallest fuse rating for its protection?
A
60W, 240V
B
60W, 40V
C
40W, 12V
D
40W, 5V
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
I = \(\frac{P}{V}\) = \(\frac{60}{240}\) = 0.25A
I = \(\frac{P}{V}\) = \(\frac{60}{40}\) = 1.5A
I = \(\frac{P}{V}\) = \(\frac{40}{12}\) = 3.3A
I = \(\frac{P}{V}\) = \(\frac{40}{5}\) = 8A
Source: Myschool Past Questions Archive (Record #28107)
Physics
UTME / JAMB 1992
Heat Energy & Temperature
Diagram
Solution
The diagram above represents the field pattern obtained by bringing the poles of two magnets together.The poles must be
Attached Figure / Diagram
A
S-S poles
B
S-N poles
C
N-S poles
D
N-N poles
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
The lines are entering both poles in the image; they must both be S-S poles
Source: Myschool Past Questions Archive (Record #41707)
Physics
UTME / JAMB 1992
Heat Energy & Temperature
Diagram
The circuit diagram above contains four ammeters W, X, Y and Z, Which of the following statements about the ammeter readings is correct
Attached Figure / Diagram
A
The reading of W is equal to that of Y and twice that of X
B
The reading of Y is greater than that of Z
C
The readings of W and Y are equal and each is greater than that of X
D
The reading of Z is equal to the sum of the readings of Y and W
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 #41709)
Physics
WAEC / WASSCE 1991
Heat Energy & Temperature
Solution
A water fall is 420m high. Calculate the difference in temperature of the water between the top and bottom of the water fall. Neglect heat loses(g = 10.0m-2 specific heat capacity of water = 4.20 x 10\(^3\) JKg-1 K-1)
A
0.1oC
B
1.0oC
C
42oC
D
100oC
E
4.20oC
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Potential Energy = Heat Energy
mgh = Mc\(\Delta \theta = \frac{gh}{c} = \frac{10 \times 240}{4.20 \times 10^3}\)
= 1.0oC
Source: WAEC / JAMB / NECO Classroom Archive (Record #33286)
Physics
UTME / JAMB 1991
Heat Energy & Temperature
Which of the following is the most suitable for use as an altimeter?
A
A mecury barometer
B
A fortin barometer
C
A mecury manometer
D
An aneroid barometer
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 #28115)
Physics
UTME / JAMB 1991
Heat Energy & Temperature
Solution
The spiral spring of a spring balance is 25.0cm long when 5N hangs on it and 30cm long, when the weight is 10N. What is the length of the spring if the weight is 3N assuming Hooke's law is obeyed?
A
15.0cm
B
17.0cm
C
20.0cm
D
23.0cm
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
let the length be Lcm
\(\frac{5 - 3}{25 - L}\) = \(\frac{10 - 5}{30 - 25}\)
L = 23cm
Source: Myschool Past Questions Archive (Record #28149)
Physics
UTME / JAMB 1991
Heat Energy & Temperature
Solution
In which of the following is surface tension important?
A
the floating of a ship in water
B
the floating of a dry needle in water
C
the floating of a baloon in air
D
the diffusion of sugar solution across a membrane
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
A carefully placed small needle can be made to float on the surface of water even though it is several times as dense as water. If the surface is agitated to break up the surface tension, then needle will quickly sink.
Source: Myschool Past Questions Archive (Record #28160)
Physics
UTME / JAMB 1991
Heat Energy & Temperature
A room is heated by means of a charcoal fire, An occupant of the room standing away from the fire is warmed mainly by
A
convection
B
radiation
C
conduction
D
reflection
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 #28183)