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Physics UTME / JAMB 1979 Current Electricity & Electric Circuits
An electric cell has an internal resistance of 2 ohms. A current of 0.5A is found to flow when a resistor of 5 ohms resistance is connected across it. What is the electromotive force of the cell?
A
5 volts
B
3.5 volts
C
2.5 volts
D
1 volts
E
10 volts
medium Difficulty
Physics UTME / JAMB 1979 Atomic, Quantum, Nuclear Physics & Electronics
Which of the following is the correct definition of 'half-life'?
A
the average life-time of a radioactive material
B
the time it takes a radioactive material to decay to half of its original quantity
C
half the period a radioactive material decays completely
D
half of the decay constant
E
the decay constant times life-time
medium Difficulty
Physics UTME / JAMB 1979 Current Electricity & Electric Circuits
The bulb of a motorcycle head-lamp is marked 40W, 6V. The resistance of the filament when it is switched on is
A
\(\frac{6^2}{40^2}\)ohms
B
\(\frac{40}{6^2}\)ohms
C
\(\frac{40}{6}\)ohms
D
6 x 40 ohms
E
\(\frac{6^2}{40}\)ohms
medium Difficulty
Physics UTME / JAMB 1979 Current Electricity & Electric Circuits
In an electrolysis experiment, a cathode of mass 5g is found o weigh 5.01g after a current of 5A flows for 50 seconds. What is the electrochemical equivalent of the deposited substance?
A
0.00004g/C
B
0.00002g/C
C
0.02500g/C
D
0.05000g/C
E
0.00001g/C
medium Difficulty
Physics UTME / JAMB 1979 Atomic, Quantum, Nuclear Physics & Electronics
Which of the following statements about radioactivity are true? i. alpha particle is positively charged ii. Beta particle is negatively charged iii. Gamma ray is neutral iv. Beta particle has the same mass as helium atom v. Gamma ray is charged
A
i, ii, iii and iv only
B
iv and v only
C
i, ii and iii only
D
i, ii and v only
E
all
medium Difficulty
Physics UTME / JAMB 1979 Current Electricity & Electric Circuits
Consider a thick glass tumbler and a thin glass tumbler which are made of the same kind of glass. Some hot liquid is poured into them. Which of the following statements is correct?
A
the thick tumbler is less likely to crack because it is stronger
B
the thick tumbler is less likely to crack because it insulates the heat beter, glass being a poor conductor of heat
C
Both tumblers are equally likely to crack because they are made of the same kind of glass
D
the thick tumbler is more likely to crack because uneven expansion persists for a longer time within the thicker glass
E
the thick tumbler is more likely to crack because it is heavier
medium Difficulty
Physics UTME / JAMB 1979 Electrostatics & Capacitors
A capacitor and a resistor are connected in series with each other and in series with an accumulator of negligible internal resistance. The potential across the terminals of the capacitor is
A
twice the e.m.f of the accumulator
B
less than the e.m.f by the potential drop across the resistor
C
zero
D
the same as the e.m.f.
E
greater than the e.m.f
medium Difficulty
Physics UTME / JAMB 1979 Current Electricity & Electric Circuits
Which of the following statements is true? The frequency of a vibrating string is
A
proportional to its length
B
inversely proportional to the tension within it
C
proportional to the aptitude of vibration
D
inversely proportional to its cross-section
E
proportional to the square root of the tension within it
medium Difficulty
Physics UTME / JAMB 1979 Elasticity, Density, Pressure & Fluids
An air bubble rises from the bottom to the top of a water dam which is 40m deep. The volume of the bubble just below the surface is 2.5cm3. Find its volume at the bottom of the dam, if atmospheric pressure is equivalent to 10m water
A
0.0cm3
B
2.0cm3
C
1.6cm3
D
0.625cm3
E
0.5cm3
medium Difficulty
Physics UTME / JAMB 1979 Waves, Sound & Vibrations
Which of the following electromagnetic waves has the shortest wavelength?
A
Radio waves
B
X-rays
C
Infra-red
D
Blue light
E
Ultraviolet
medium Difficulty
Physics UTME / JAMB 1979 Calorimetry, Latent Heat & Change of State
All the heat generated in a 5 ohms resistor by 2A flowing for 30 seconds is used to evaporate 5g of a liquid at its boiling point. Which of the following is the correct value of the specific latent heat of the liquid?
A
120J
B
60Jg-1
C
120Jg-1
D
1500J
E
1500Jg-1
medium Difficulty
Physics UTME / JAMB 1979 Reflection, Refraction & Dispersion of Light
The speed of light in air is 3 x 108ms-1. If the refractive index of light from air-to-water is \(\frac{4}{3}\), then which of the following is the correct value of the speed of light in water?
A
4 x 108ms-1
B
2.25 x 108ms-1
C
\(\frac{4}{9}\) x 108ms-1
D
2.25 x 102ms-1
E
4.33 x 108ms-1
medium Difficulty
Physics UTME / JAMB 1979 Magnetism, Electromagnetism & AC Circuits
On which of the following is the operation of a moving coil galvanometer based?
A
Magnetic effect of electric current
B
Electromagnetic induction
C
Chemical reaction produced by electricity
D
Force on current carrying conductor in a magnetic field
E
Electrical energy and power
medium Difficulty
Physics UTME / JAMB 1979 Atomic, Quantum, Nuclear Physics & Electronics
It is known that a neutron exists in a light atomic nucleus. Which of the following also exists in the nucleus?
A
an electron
B
a \(\beta\)-particle
C
an \(\alpha\)-particle
D
a proton
E
an atom
medium Difficulty
Physics UTME / JAMB 1979 Work, Energy, Power & Simple Machines
A weight of 1000 grams hangs from a lever 20cm to the fulcrum. At the left is a 500-gram weight 20cm from the fulcrum, and a 200-gram weight x cm away from the fulcrum. What is the value of x that will make the lever balanced?
A
50cm
B
20cm
C
10cm
D
30cm
E
70cm
medium Difficulty
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