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Physics
UTME / JAMB 2015
Heat Energy & Temperature
Solution
If a ball released from a height of 20m, How long would it take the ball to reach the ground? (assures g = 10m/s)
A
2sec
B
3sec
C
35sec
D
2.4sec
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
Using the equation
S = ut + ½ gt2
H = s = 20m, t = ?
G =10m/s2, u = 0m/s
20 = 0 × t × ½ × 10 t
20 = 5t
i.e 5t2 = 20
t = 20/5 = 4
t = 4 (squaring both sides)
√ t2 = √4
= 2sec
∴ t = 2sec
Source: Myschool Past Questions Archive (Record #40857)
Physics
UTME / JAMB 2015
Heat Energy & Temperature
Solution
If the mechanical advantage of a machine is 4. What is its ratio for LOAD to EFFORT?
A
4:01
B
1:04
C
5:01
D
2:01
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
Mechanical advantage (M.A) of a machine is the ratio of its load to effort
Mathematically
Mechanical advantage (M.A) = Load (L) ÷ Effort (E)
In symbol M.A = L/E
Note:Mechanical (advantages has no S.I unit)
If M.A = 4 then,
L/E = 4/1
The ratio of load to effort = 4 : 1 respectively
Source: Myschool Past Questions Archive (Record #40860)
Physics
UTME / JAMB 2015
Heat Energy & Temperature
Solution
The optical instrument which is suitable for viewing a nearby objects is ………..?
A
Telescope
B
sextant
C
microscope
D
periscope
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Microscope is used for nearby object
Source: Myschool Past Questions Archive (Record #40869)
Physics
UTME / JAMB 2015
Heat Energy & Temperature
The strength of an electromagnet increases with
A
Increases in the number of turn of the coil
B
Decreases in current with the coil
C
Increases in the distance between the pole
D
Increases in current without the coil
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 #40884)
Physics
UTME / JAMB 2015
Heat Energy & Temperature
Solution
Neutron were discovered by
A
J.J. Thompson
B
James Chadwick
C
Michael faraday
D
Dalton
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Neutron were discovered by James Chadwick in 1931
Source: Myschool Past Questions Archive (Record #40892)
Physics
UTME / JAMB 2015
Heat Energy & Temperature
Solution
If a projectile has maximum range of 36m, find the speed of projection (Take g = 9.8m/s2)
A
19m/s
B
2m/s
C
4m/s2
D
7m/s2
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
Max Range = \(\frac{u^2}{\text{g}}\)
36 = \(\frac{u^2}{9.8}\)
u\(^2\) = 36 x 9.8 = 352.8
u = \(\sqrt{352.8}\) ≈ 18.78m/s
Source: Myschool Past Questions Archive (Record #40894)
Physics
UTME / JAMB 2015
Heat Energy & Temperature
Solution
The dimension of universal gravitational constant is……….?
A
\( M^{–1}L^3 T^{–2} \)
B
ML3T2
C
ML3
D
MLT-2
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
f α (MM ÷g2)
F(GMM ÷ r2) [G – gravitational constant]
GMM = Fr2
G = F02 ÷ MM = m × aπr2 ÷ MM (f = ma)
= (m × m5-2 × r2) ÷ MM
= (Kg.m52 × m2) ÷ Kg.Kg
=1 ÷ kg.m3.52
The dimension mathematically representation have a quantities of M, L AND T
M (Mass) = kg, L (Length) = M, T (Time) second
G = kg-1 m2.52(Using dimension rule)
M-1.L3.T-2
∴ The universal gravitational constant (G) =\( M^{–1}L^3 T^{–2} \)
Source: Myschool Past Questions Archive (Record #41308)
Physics
UTME / JAMB 2015
Heat Energy & Temperature
Solution
A regular spacing or arrangement of atoms in a crystalline material is called
A
Orbit
B
Lattice
C
Atomic structure
D
Energy level
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
The regular arrangement of atoms in a crystalline materials is called LATTICES
Source: Myschool Past Questions Archive (Record #41314)
Physics
UTME / JAMB 2015
Heat Energy & Temperature
The net movement of solvent molecules from a region of high solvent potential to a region of lower solvent potential through a partially or semi permeable membrane is refer to as
A
Diffusion
B
Osmosis
C
Surface tension
D
Cohesion
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 #41316)
Physics
UTME / JAMB 2015
Heat Energy & Temperature
Solution
The eyeball consists of a round tough white skin called
A
Sclerotic
B
Choroid coal
C
Optical fiber
D
Accommodation
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
Sclerotic coat (sclera) is the tough outer coat of the eye that coves the eyeball (ii) sclerotic coat is modified in front of the eye to from a transparent and horny window
Source: Myschool Past Questions Archive (Record #41319)
Physics
UTME / JAMB 2015
Heat Energy & Temperature
Solution
Volatile liquids usually
A
Have high boiling points
B
have low boiling points
C
have high densities
D
have high melting points
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Volatile liquids (i.e. Ammonia or Freon) are usually have low boiling point
Source: Myschool Past Questions Archive (Record #41326)
Physics
UTME / JAMB 2015
Heat Energy & Temperature
Solution
The property of a body to remain at rest or to continue to move in a straight line is known as
A
force
B
Impulse
C
Energy
D
Inertia
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Inertia: the property of a body that resists any change to its uniform motion, equivalent to its mass
Source: Myschool Past Questions Archive (Record #41337)
Physics
UTME / JAMB 2015
Heat Energy & Temperature
Solution
An alternating current with a frequency of 100HZ has a period of
A
0.03sec
B
0.01sec
C
0.04sec
D
0.15sec
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
F = 100HZ, period, T = 1/f = 1/100
= 0.01 sec
The period (T) = 0.01sec
Source: Official Exam / Past Question Archive
Physics
WAEC / WASSCE 2015
Heat Energy & Temperature
Materials that can be stretched and still return to their original forms when the stresses are removed are said be
A
elastic
B
elastomer
C
plastic
D
thermoplastic
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 #45416)
Physics
WAEC / WASSCE 2015
Heat Energy & Temperature
Which of the following units is derived?
A
kg
B
m
C
K
D
N
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 #45417)