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Physics
UTME / JAMB 2012
Current Electricity & Electric Circuits
The fuse in an electric device is always connected to the
A
neutral side of an electric supply
B
earth side of an electric supply
C
live side of an electric supply
D
terminal side of an electric supply
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 #27417)
Physics
UTME / JAMB 2012
Magnetism, Electromagnetism & AC Circuits
Solution
A particle carrying a charge of 1. 0 x 10-8C enters a magnetic field at 3.0x 10-2 ms -1 at right angles to the field. If the force on this particle is 1.8 x 10-8N, what is the magnitude of the field?
A
6.0x10-1T
B
6.0x10T
C
6.0x10-3T
D
6.0x10-4T
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
F = BQV
B = \(\frac{F}{QV}\)
B = \(\frac{1.8 \times 10^{-8}}{1.0 \times 10^{-8} \times 3.0 \times 10^{-2}}\)
Source: Myschool Past Questions Archive (Record #27419)
Physics
UTME / JAMB 2012
Current Electricity & Electric Circuits
Solution
The current output from of an a.c. source is given as I = 10 sin to t. The d.c equivalent of the current is
A
5.0A
B
7.1A
C
10.0A
D
14.1A
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Irms = \(\frac{10}{\sqrt{2}}\)
Source: Myschool Past Questions Archive (Record #27420)
Physics
UTME / JAMB 2012
Magnetism, Electromagnetism & AC Circuits
A conductor of length 1m moves with a velocity of 50ms-1 at an angle of 30o to the direction of a uniform magnetic field of flux density 1.5Wbm-2. What is the e.m.f induced in the conductor?
A
37.5V
B
50.5V
C
75.0V
D
80.5V
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 #27421)
Physics
UTME / JAMB 2012
Atomic, Quantum, Nuclear Physics & Electronics
The process of detecting a pin mistakenly swallowed by a child is X-ray
A
Diagnosis
B
Therapy
C
Crystallography
D
Mammography
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 #27422)
Physics
UTME / JAMB 2012
Atomic, Quantum, Nuclear Physics & Electronics
Which of the following CANNOT be deflected by both electric and magnetic fields?
A
Gamma rays
B
Alpha particles
C
Wave particles
D
Beta particles
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 #27423)
Physics
UTME / JAMB 2012
Atomic, Quantum, Nuclear Physics & Electronics
Solution
A piece of radioactive material contains 1000 atmos. If its half -life is 20seconds, the time taken for 125 atoms to remain is
A
20 seconds
B
40 seconds
C
80 seconds
D
60 seconds
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
1000 → 500 → 250 → 125
20 + 20 + 20 = 60s
Source: Myschool Past Questions Archive (Record #27424)
Physics
UTME / JAMB 2012
Atomic, Quantum, Nuclear Physics & Electronics
The p-n junction diodes can act as rectifiers because they
A
conduct current when forward-biased
B
conduct current when reverse-biased
C
block current when forward-biased
D
conduct current in both directions
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 #27425)
Physics
UTME / JAMB 2012
Atomic, Quantum, Nuclear Physics & Electronics
Solution
If a reverse-biased voltage is applied across a p-n junction, the depletion layer width is
A
increased
B
decreased
C
constant
D
halved
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
The width of the depletion layer in a p-n junction diode increases in reverse bias as charge carriers are swept into battery terminals, holes from the p-type into the negative terminal, and electrons from the n-type into the positive terminal.
Source: Myschool Past Questions Archive (Record #27426)
Chemistry
UTME / JAMB 2012
Nature of Matter & Separation Techniques
Solution
Which of the following methods can be used to obtain pure water from a mixture of sand, water and methanoic acid?
A
netralization with NaOHfoolowed by filtration
B
neutralization with NaOH followed by distillation
C
fractional distillation
D
filtration followed by distillation
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
To obtain pure water from a mixture of sand, water, and methanoic acid, we need to consider the properties of each component:
- Sand is insoluble in water and can be removed by filtration.
- Methanoic acid (formic acid) is a volatile liquid that can be separated from water by distillation.
- Water is the desired product.
Considering these properties, the correct answer is: Option D. (Filtration followed by distillation)
Here's the step-by-step process:
1. Filtration: Remove the sand from the mixture by passing it through a filter paper.
2. Distillation: Distill the resulting liquid mixture to separate the methanoic acid from the water. Since water has a lower boiling point than methanoic acid, it will vapourize and condense first, allowing you to collect the pure water.
Source: Myschool Past Questions Archive (Record #27464)
Chemistry
UTME / JAMB 2012
Stoichiometry, Mole Concept & Volumetric Analysis
How many atoms are present in 6.0g of magnesium?
[Mg = 24, NA = 6.02 x 1023 mol-1]
A
1.20 x 1022
B
2.41 x 1022
C
1.51 x 1023
D
3.02 x 1023
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option C.
Source: Myschool Past Questions Archive (Record #27465)
Chemistry
UTME / JAMB 2012
Reaction Rates & Chemical Equilibrium
An increase in the pressure exerted on gas at a constant temperature results in
A
a decrease in the number of effective collisions
B
a decrease in volume
C
an increase in the average intermolecular distance
D
an increase in volume
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option B.
Source: Myschool Past Questions Archive (Record #27467)
Chemistry
UTME / JAMB 2012
Stoichiometry, Mole Concept & Volumetric Analysis
2H2(g) + O2(g) → 2H2 O(g)
In the reaction above, what volume of hydrogen would be left over when 300 cm3 of oxygen and 1000 cm3 of hydrogen are exploded in a sealed tube?
A
200 cm3
B
400 cm3
C
600 cm3
D
700 cm3
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option B.
Source: Myschool Past Questions Archive (Record #27468)
Chemistry
UTME / JAMB 2012
Nature of Matter & Separation Techniques
l . Evaporation. ll. Sublimation. lll. Diffusion. IV. Brownian motion.
Which of the above can correctly be listed as evidences for the particulate nature of matter?
A
I and lll only
B
ll and lV only
C
l, ll and lll only
D
l, ll, lll and lV
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #27469)
Chemistry
UTME / JAMB 2012
Chemical Bonding & Intermolecular Forces
If the elements X and Y have atomic numbers 11 and 17 respectively, what type of bond can they form?
A
Dative
B
Covalent
C
Ionic
D
Metallic
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option C.
Source: Myschool Past Questions Archive (Record #27470)