Question Library
Browse, filter, and study verified past examination questions with step-by-step mathematical reasoning.
Searching 18,000+ Questions...
Sifting topics, KaTeX formulas & verified solutions
Showing 10351–10365 of 14893 verified questions
Sort by:
Physics
UTME / JAMB 1993
Temperature, Thermometry & Thermal Expansion
Solution
A metal rod 800mm long is heated from 10oC to 95oC. If it expands by 1.36mm, the linear expansivity of the metal is
A
2.0 x 102K-1
B
2.0 x 102K-1
C
5.0 x 10-3K-1
D
2.0 x 10-5K-1
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
a = \(\frac{1.36}{800 \times (95 - 10)}\)
= 2.0 x 10-5K-1
Source: Myschool Past Questions Archive (Record #27978)
Physics
UTME / JAMB 1993
Current Electricity & Electric Circuits
Solution
When the volume of a given mass of gas is halved and its temperature doubled, the pressure
A
remains constant
B
increases by a factor of 4
C
increases by a factor of 3
D
decreases by a factor of 4
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
\(\frac{P_1V_1}{T_1}\) = \(\frac{P_2V_2}{T_2}\)
V1 = 2V2 and T2 = 2T1
\(\frac{P_1\times 2V_2}{T_1}\) = \(\frac{P_2\times V_2}{2T_1}\)
P2 = 4P1
Source: Myschool Past Questions Archive (Record #27983)
Physics
UTME / JAMB 1993
Current Electricity & Electric Circuits
Solution
200g of water at 90^\circC is mixed with 100g of water at 30^\circC. What is the final temperature?
A
50oC
B
60oC
C
70oC
D
80oC
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Heat lost = heat gained
200 x c x (90 - \(\theta\))= 100\(\times\) c \(\times\) (\(\theta - 30\))
Dividing through by 100c, we have
2(\(90 - \theta\)) = (\(\theta - 30\))
simplifying, we have
\(\theta\) = 70^\circ
Source: Myschool Past Questions Archive (Record #27988)
Physics
UTME / JAMB 1993
Waves, Sound & Vibrations
Solution
The relationship between L and the wavelength I of the stationary wave is
A
2L = \(\lambda\)
B
L = \(\lambda\)
C
L = \(\frac {\lambda}{3}\)
D
4L = 3 \(\lambda\)
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
L = - \(\lambda\) \(\Rightarrow\)4L = 3 \(\lambda\)
Source: Myschool Past Questions Archive (Record #27992)
Physics
UTME / JAMB 1993
Waves, Sound & Vibrations
Solution
Determine the distance between the consecutive antinodes XX if the wavelength is 60cm
A
15cm
B
30cm
C
60cm
D
120cm
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Distance XX = \(\frac{1}{2}\)\(\lambda\)
= \(\frac{1}{2}\) x \(\frac{60}{1}\)
= 30cm
Source: Myschool Past Questions Archive (Record #27995)
Physics
UTME / JAMB 1993
Waves, Sound & Vibrations
Which of the following waves can propagate through a vacuum?
A
High velocity sound waves
B
Ultrasonic waves
C
Acoustic waves
D
Infra-red waves
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 #27996)
Physics
UTME / JAMB 1993
Current Electricity & Electric Circuits
Solution
Radio waves emitted from an antenna are picked up by a radar after reflection from an aircraft in 4 x 10\(^{-3}\)S. How far is the aircraft from the antenna? [c = 3 x 10\(^8\)ms\(^{-1}\) ]
A
6.0 x 10\(^2\)km
B
1.2 x 103km
C
3.0 x 103km
D
6.0 x 10 5km
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
\(\text{Total time (to aircraft and back)} = 4 \times 10^{-3} \, \text{s} \)
\(\text{Speed of radio waves} = 3 \times 10^8 \, \text{m/s}\)
\(\text{Round-trip distance} = 3 \times 10^8 \times 4 \times 10^{-3}\) = 1.2 \(\times 10^6 \, \text{m}\)
\(\text{Actual distance to aircraft} = \frac{1.2 \times 10^6}{2}\)
= 600,000m = 600km.
Source: Myschool Past Questions Archive (Record #27999)
Physics
UTME / JAMB 1993
Reflection, Refraction & Dispersion of Light
Solution
Which of the following expressions gives the linear magnification produced by a concave mirror of radius of curvature r, if U and V are the object and image distances respectively?
A
\(\frac{V}{r}\) - 1
B
\(\frac{2V}{r}\) - 1
C
\(\frac{U}{r}\) - 1
D
\(\frac{2U}{r}\) - 1
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
F = \(\frac{r}{2}\) and v = mu
F = \(\frac{UV}{U + V}\)
\(\frac{r}{2}\) = \(\frac{U \times mu}{U + mu}\)
\(\frac{r}{2}\) = \(\frac{mu^2}{u(1 + m)}\)
\(\frac{r}{2} = \frac{mu}{1+m}\)
\(\frac{r}{2} = \frac{v}{1+m}\)
\(\frac{2v}{r} = 1+m\)
\(m = \frac{2v}{r} - 1\)
Source: Myschool Past Questions Archive (Record #28003)
Physics
UTME / JAMB 1993
Lenses & Optical Instruments
Solution
If the focal length of a camera lens is 20cm, the distance from the film at which the lens must be set to produce a sharp image of an object 100cm away is
A
17cm
B
20cm
C
25cm
D
100cm
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
F = \(\frac{uv}{u + v}\)
20 = \(\frac{100 \times v}{100 + v}\)
v = 25cm
Source: Myschool Past Questions Archive (Record #28005)
Physics
UTME / JAMB 1993
Reflection, Refraction & Dispersion of Light
Which of the following may be used to explain a mirage? i. layers of air near the road surface have varying refractive indices in hot weather. ii. road surfaces sometimes become good reflectors in hot weathers. iii. light from the sky can be reflected upwards after coming close to the road surface.
A
ii only
B
ii and iii only
C
i and iii only
D
i, ii, and iii 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 #28006)
Physics
UTME / JAMB 1993
Reflection, Refraction & Dispersion of Light
Solution
A beam of light is incident from air to water at an angle of 30oC. Find the angle of refraction if the refractive index of water is \(\frac{4}{3}\)
A
15oC
B
18oC
C
22oC
D
24oC
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
\(\frac{4}{3}\) = \(\frac{sin30}{sinr}\)
r = 22oC
Source: Myschool Past Questions Archive (Record #28007)
Physics
UTME / JAMB 1993
Current Electricity & Electric Circuits
Which of the following correctly explain(s) why a green leaf appears green in bright day light? i. it absorbs only the green component of sunlight. ii. it absorbs all colour of sunlight except green. iii. it reflects only the green component of sunlight.
A
i only
B
ii only
C
i and iii only
D
ii and iii 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 #28009)
Physics
UTME / JAMB 1993
Magnetism, Electromagnetism & AC Circuits
Solution
Which of the following correctly explains why soft iron is proffered to steel in electromagnets? i. soft iron is more readily magnetized than steel. ii. soft iron is more readily demagnetized than steel. iii. soft iron retains magnetism more than steel.
A
i only
B
ii and iii only
C
i and ii only
D
i, ii, and iii.
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Soft iron is more readily magnetized than steel (i): Soft iron can become magnetized more easily and reaches saturation quicker than steel.
Soft iron is more readily demagnetized than steel (ii): Soft iron loses its magnetism more quickly when the magnetic field is removed, which is desirable in applications like electromagnets that need to be turned on and off.
Soft iron retains magnetism more than steel (iii): Soft iron does not retain magnetism as well as steel; that is one of the reasons it is used in electromagnets.
Therefore, i and ii are correct.
Source: Myschool Past Questions Archive (Record #28010)
Physics
UTME / JAMB 1993
Magnetism, Electromagnetism & AC Circuits
A current carrying conductor experiences a force when placed in a magnetic field because the
A
conductor is magnetized
B
magnetic field of the current interacts with external magnetic field
C
force is due to the motor principle
D
electric field of the current interacts with the external magnetic field
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 #28011)
Physics
UTME / JAMB 1993
Waves, Sound & Vibrations
A simple cell with mercury-amalgamated zinc electrode prevents
A
local actions
B
polarization
C
buckling
D
degradation
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 #28012)