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Physics
UTME / JAMB 1991
Reflection, Refraction & Dispersion of Light
In a ray diagram for a thin converging lens, a ray that is not parallel to the optic axis but passes through the optic center will
A
pass through undeviated
B
pass through the center of curvature after refraction
C
emerge parallel to the principal axis
D
pass through the principal focus after refraction
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 #28189)
Physics
UTME / JAMB 1991
Lenses & Optical Instruments
Solution
Which of the following correctly, describes the image of an object, 4cm from a diverging lens of focal length 12cm?
A
The image is virtual, 3cm in front of the lens
B
The image is real, 6cm behind the lens
C
The image is virtual, 6cm in front of the lens
D
The image is real, 3cm in front the lens
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
F = \(\frac{uv}{u + v}\)
F = -ve
-12 = \(\frac{4 \times v}{4 + v}\)
v = -3cm
Source: Myschool Past Questions Archive (Record #28190)
Physics
UTME / JAMB 1991
Current Electricity & Electric Circuits
Solution
Two tuning forks of frequency 256Hz and 260Hz are sounded close to each other. What is the frequency of the beats produced?
A
2Hz
B
4Hz
C
8Hz
D
258Hz
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
F = F2 - F1
= 260 - 256
= 4Hz
Source: Myschool Past Questions Archive (Record #28191)
Physics
UTME / JAMB 1991
Waves, Sound & Vibrations
Solution
A man hears his echo from a nearby hill 2s after he shouted. If the frequency of his voice is 260Hz and the wavelength is 1.29m, how far away is the hill?
A
330.0m
B
335.4m
C
660.0m
D
670.8m
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
v = \(\lambda\)F
260 x 1.29 =335.4ms-1
Echo time = \(\frac{2}{2}\) = 1sec.
distance = v x t
= 335.4 x 1 = 335.4m
Source: Myschool Past Questions Archive (Record #28193)
Physics
UTME / JAMB 1991
Waves, Sound & Vibrations
Solution
When the bottom tip of a vibrating tuning fork is held in contact with a wooden box, a louder sound is heard. This phenomenon is known as
A
beats
B
echoing
C
resonance
D
reverberation
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
The wooden box is in forced vibration, and the louder sound(higher amplitude) heard arises from the fork's forcing frequency coinciding with the box's natural frequency.
Source: Myschool Past Questions Archive (Record #28194)
English Language
UTME / JAMB 1991
Lexis, Structure & Register (Cloze & Vocabulary)
The expression 'necessary evil' means that
A
evil is essential in studying the subject discussed
B
studying the subject is an unpleseant experience which must be endured
C
only those who are evil can understand the subject
D
those lacking in quantitative skills see the subject as an evil
medium Difficulty
Verified Correct Answer: Option B
Grammar & Contextual Explanation
No expanded working has been attached for this question yet. The verified answer is Option B.
Source: Myschool Past Questions Archive (Record #15292)
English Language
UTME / JAMB 1991
Reading Comprehension, Summary & Composition
From the passage, we learn that the book discussed has been
A
reprinted twice
B
published three times
C
rewritten three times
D
revised twice
medium Difficulty
Verified Correct Answer: Option C
Grammar & Contextual Explanation
No expanded working has been attached for this question yet. The verified answer is Option C.
Source: Myschool Past Questions Archive (Record #15293)
Physics
UTME / JAMB 1991
Magnetism, Electromagnetism & AC Circuits
Which of the following statements is CORRECT about the earth's magnetic field?
A
the angle of dip is the angle which a freely suspended magnet makes with the vertical
B
the angle of declination is the angle between the magnetic meridian and the geographic meridian
C
the angle of declination is the angle which a magnetic compass makes with the magnetic meridian
D
the angle of inclination is the difference between the angle of dip and the angle of declination
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 #28195)
Physics
UTME / JAMB 1991
Current Electricity & Electric Circuits
Solution
An insulated rod when rubbed with a material acquires
A
a negative charge if it is made of glass and rubbed with silk
B
no charge if it is made of glass and rubbed with fur
C
no charge if it is made of copper and rubbed with silk
D
a positive charge if it is made of copper and rubbed with fur
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
An insulated rod, when rubbed with a material, acquires no charge if it is made of copper and rubbed with silk.
Source: Myschool Past Questions Archive (Record #28196)
Physics
UTME / JAMB 1991
Current Electricity & Electric Circuits
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
Current Electricity & Electric Circuits
A moving coil galvanometer of 300\(\Omega\) resistance gives full scale deflection for 1.0mA. The resistance R, of the shunt that is required to convert the galvanometer into a 3.0A ammeter is
A
899.70\(\Omega\)
B
10.00\(\Omega\)
C
0.10\(\Omega\)
D
0.01\(\Omega\)
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 #28198)
Physics
UTME / JAMB 1991
Current Electricity & Electric Circuits
Which of the following obeys Ohm's Law?
A
Glass
B
Diode
C
All electrolytes
D
All metals
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 #28199)
Physics
UTME / JAMB 1991
Current Electricity & Electric Circuits
Solution
An equipment whose power is 1500W and resistance is 375 ohms would draw a current of
A
0.10A
B
2.00A
C
4.00A
D
77.5A
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
P = I2R \(\Rightarrow\) I = \(\sqrt\frac{P}{R}\)
I = \(\sqrt\frac{1500}{375}\)
= 2A
Source: Myschool Past Questions Archive (Record #28200)
Physics
UTME / JAMB 1991
Magnetism, Electromagnetism & AC Circuits
To convert an alternating current dynamo into a direct current dynamo, the
A
number of turns in the coil is increased
B
strength of the field magnet is increased
C
slip rings are replaced with a split ring commutator
D
coil is wound on a soft iron armature
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 #28201)
Physics
UTME / JAMB 1991
Current Electricity & Electric Circuits
If a current carrying coil is mounted on a metal frame, the back e.m.f. induced in the coil causes
A
inductance
B
eddy currents
C
elecro-magnetism
D
dipole moment
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 #28202)