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Physics
UTME / JAMB 2019
Electricity and Magnetism
Diagram
Solution
Which of the following statement about the electromagnet shown above is correct?
Attached Figure / Diagram
A
when the current flows from A to B, the end A will be in north pole
B
when the current flows from A to B, the end A will be south pole
C
when the current flows from A to B, the end B will be south pole
D
none of the above
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
A - B = S - N.
Also, starting end of the current is south while terminating end is North.
Source: Myschool Past Questions Archive (Record #55594)
Physics
UTME / JAMB 2019
Mechanics and Properties of Matter
Solution
Calculate the velocity ratio of a screw jack of pitch 0.2cm if the length of the tommy bar is 23cm
A
230\(\pi\)
B
23\(\pi\)
C
70\(\pi\)
D
140\(\pi\)
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
P = 0.2cm, L = r = 23cm
VR
=
2\pir
P
=
2\piL
P
=
2\pi\times23
0.2
=
230\pi
Source: Myschool Past Questions Archive (Record #55597)
Physics
UTME / JAMB 2019
Mechanics and Properties of Matter
Solution
The following are some units
I. Ns
II. Non
III. Nm\(^{-2}\)
IV. J^\circK\(^{-1}\)
V. JKg\(^{-1}\)
What are the units of latent heat?
A
I
B
II
C
III
D
V
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Latent heat or specific latent heat = L
Heat
energy
=
mL
or
L
=
H
m
=
energy
mass
Source: Myschool Past Questions Archive (Record #55659)
Physics
UTME / JAMB 2019
Thermal Physics
Solution
When two objects A and B are supplied with the same quantity of heat, the temperature change in A is obtained to be twice that of B. The mass of A is half that of B. The ratio of the specific heat capacity of A to B is
A
1 : 4
B
4 : 1
C
1 : 1
D
2 : 1
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
\thetaA = 2\thet\(a_B\),
m\(_A\)
=
1
2
m\(_B\)
H = MC\theta
m\(_A\)c\(_A\)\theta\(_A\) = m\(_B\)c\(_B\)\theta\(_B\)
( 1/2 m\(_B\))C\(_A\) (2\theta\(_B\)) = m\(_B\)c\(_B\)\theta\(_B\)
C\(_A\)
C\(_B\)
=
1
1
⇒ 1 : 1
Source: Myschool Past Questions Archive (Record #55662)
Physics
UTME / JAMB 2019
Mechanics and Properties of Matter
Solution
The volume of 0.354g of helium at 273^\circC and 114cmhg of mercury pressure is 2667cm\(^3\). Calculate the volume at STP.
A
2000.25 cm\(^3\)
B
200.025 cm\(^3\)
C
4003.27 cm\(^3\)
D
2010.25 cm\(^3\)
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
m = 0.354g, T\(_1\) = 273^\circC = 273 + 273 = 546K
P\(_1\) = 114cmHg, V\(_1\) = 2667cm\(^3\) at STP
T\(^2\) = 273K, P\(_2\) = 76cmHg, V\(_2\) = ?
\(\frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_1}\)
= 2000.25cm\(^3\)
Source: Myschool Past Questions Archive (Record #55664)
Physics
UTME / JAMB 2019
Mechanics and Properties of Matter
Solution
Which of these is observed when air is pumped out of a discharge tube without lowering its pressure
A
the conductivity of the air increases
B
the conductivity of the air decreases
C
conduction does not occur
D
spark are produced
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Conduction takes places in gases when air is pumped out of a discharged tube under reduced pressure.
Source: Myschool Past Questions Archive (Record #55670)
Physics
UTME / JAMB 2019
Waves and Optics
Solution
Which of the following characteristics of a wave is used in the measurement of the depth of the Sea?
A
diffraction
B
interference
C
refraction
D
reflection
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Depth of sea can be measured by echo, a reflected sound waves.
Source: Myschool Past Questions Archive (Record #55678)
Physics
UTME / JAMB 2019
Mechanics and Properties of Matter
Solution
If the attraction of the sun is suddenly ceased, the earth would continue to move in a straight line making a tangent with the original orbit. This statement is derived from Newton's
A
First law of motion
B
Second law of motion
C
Third law of motion
D
Law of universal gravitation
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
Newton's First law of motion describes the straight motion of a body.
Source: Myschool Past Questions Archive (Record #55680)
Physics
UTME / JAMB 2019
Thermal Physics
Solution
Heat may be transferred by conduction, convection and radiation. By which of these methods does heat travel through vacuum?
A
Conduction only
B
Convection only
C
Radiation only
D
All these methods
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Vacuum is an enclosure with no air or agent of heat transfer
Source: Myschool Past Questions Archive (Record #55682)
Physics
UTME / JAMB 2019
Mechanics and Properties of Matter
Solution
The part of the human eye that does similar work as the diaphragm of a camera lens is the
A
Ciliary muscles
B
Pupil
C
Iris
D
Retina
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Iris is similar to diaphragm.
Source: Myschool Past Questions Archive (Record #55685)
Physics
UTME / JAMB 2019
Mechanics and Properties of Matter
Solution
A projectile of mass 4kg is fired vertically and reaches a maximum height of 40m. Calculate the potential energy at the highest point
(g = 10ms\(^{-2}\)
A
1800J
B
1600J
C
600J
D
440J
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Potential energy at the highest point = mgh
PE = 4 \times 10 \times 40 = 1600J
Source: Myschool Past Questions Archive (Record #55692)
Physics
UTME / JAMB 2019
Heat Energy & Temperature
Solution
The length of the seconds hand of laboratory clock is 0.1m. Calculate the speed at the top of the seconds hand
A
1.05 × 10\(^{-2}\)ms\(^{-1}\)
B
1.85 × 10\(^{-4}\)ms\(^{-1}\)
C
9.50 × 10\(^{-1}\)ms\(^{-1}\)
D
5.25 × 10\(^{-3}\)ms\(^{-1}\)
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
\(\text{Circumference} \, (d) = 2 \pi r = 2 \pi (0.1) \approx 0.6283 \, \text{m}\)
\(\text{Time for one revolution} \, (t) = 60 \, \text{s}\)
\(\text{Speed} \, (v) = \frac{d}{t} = \frac{0.6283}{60} \approx 0.01047 \, \text{m/s} \approx 1.05 \times 10^{-2} \, \text{ms}^{-1}\)
Source: Myschool Past Questions Archive (Record #55693)
Physics
UTME / JAMB 2019
Heat Energy & Temperature
Diagram
Solution
The resultant capacitance in the figure above is
Attached Figure / Diagram
A
0.4μf
B
0.8μf
C
1.8μf
D
4.5μf
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
For the parallel arrangement = 2 + 4 = 6\muf
For
the
series
arrangement
=
1
C\(_T\)
=
1
2
+
1
3
+
1
6
+
1
4
1
C\(_T\)
=
15
12
C\(_T\)
=
12
15
=
0.8\muf
Source: Myschool Past Questions Archive (Record #55628)
Physics
UTME / JAMB 2019
Thermal Physics
Solution
The lower fixed part of a faulty thermometer reads 2^\circC while the upper fixed point is 100^\circC.
What is the true temperature when the thermometer reads 51^\circC?
A
52°C
B
50°C
C
49°C
D
46°C
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
C\(_{\theta}\) = 50, C\(_0\) = 2, C\(_{100}\) = 100
\theta
=
C\(_{\theta}\) - C\(_0\)
C\(_{100}\) - C\(_0\)
\times
100
=
51 - 2
100 - 2
\times
100
=
49
98
\times
100
\theta = 50^\circC.
Source: Myschool Past Questions Archive (Record #55638)
Physics
UTME / JAMB 2019
Mechanics and Properties of Matter
Solution
A boy pushes a 500kg box along a floor with a force of 2000N. If the velocity of the box is uniform, the co-efficient of friction between the box and the floor is
A
1
B
0.8
C
0.65
D
0.4
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
m = 500kg, W = mg = 500 \times 10 = 5000N
F = 2000N
\mu
=
Force at constant velocity
weight
=
2000
5000
=
0.4
Source: Myschool Past Questions Archive (Record #55657)