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Physics UTME / JAMB 1978 Current Electricity & Electric Circuits
The internationally agreed system of units(SI) for physical measurements are
A
Ib, ft, sec
B
g, m, sec
C
kg, m, sec
D
cm, g, sec
E
kg, cm, sec
medium Difficulty
Physics UTME / JAMB 1978 Units, Measurements & Dimensional Analysis
To determine the weight of an object you could
A
use a beam balance
B
use a spring balance
C
find the force necessary
D
use none of these methods
E
use any of these methods
medium Difficulty
Physics UTME / JAMB 1978 Current Electricity & Electric Circuits
The force required to make an object of mass m, travelling with velocity v, turn in a circle of radius r is
A
\(\frac{mv^2}{r}\)
B
\(\frac{mr^2}{v}\)
C
\(\frac{mr}{v}\)
D
\(\frac{mv}{r^2}\)
E
\(\frac{mv}{r}\)
medium Difficulty
Physics UTME / JAMB 1978 Current Electricity & Electric Circuits
The density of a solid is defined as the
A
mass of the solid compared to the mass of an equal volume of water
B
amount of water displaced when a unit mass of thesolid is immersed in it
C
weight per unit volume of the solid
D
volume per unit mass of the solid
E
mass per unit volume of the solid
medium Difficulty
Physics UTME / JAMB 1978 Current Electricity & Electric Circuits
A solid suspended by a piece of string is completely immersed in water. On attempting to lift the solid out of the water, the string breaks when the solid is partly out of the water. This is because
A
the tension in the string decreases as the solid is lifted
B
the mass of the solid has increased
C
the solid apparently weighs less when completely immersed in water than when partially immersed
D
part of the solid still in water is exerting more force on the string
E
the solid is no longer in equilibrium with water
medium Difficulty
Physics UTME / JAMB 1978 Calorimetry, Latent Heat & Change of State
The statements below were made by some students describing what happened during the determination of the melting point of solids. i. the temperature of the solid was solid until melting started ii. the temperature of the solid rose until melting started iii. during melting, the temperature was rising iv. during melting, the temperature was constant v. the temperature continued to rise after all the solid had melted vi. the temperature stopped rising after all the solid had melted. Which of the following gives correct statements in the right order?
A
ii, iv, and v
B
ii, iii and vi
C
i, iii and vi
D
i, iii and v
E
i, iv and v
medium Difficulty
Physics UTME / JAMB 1978 Elasticity, Density, Pressure & Fluids
A few grains of table salt were put in a cup of water, kept at constant temperature and left undisturbed. Eventually all the water tasted salty. The action is due to
A
convection
B
osmosis
C
capillarity
D
diffusion
E
conductivity
medium Difficulty
Physics UTME / JAMB 1978 Current Electricity & Electric Circuits
A temperature 20^\circC is the same as
A
36oF
B
68oF
C
11.1oF
D
43.1oF
E
25oF
medium Difficulty
Physics UTME / JAMB 1978 Calorimetry, Latent Heat & Change of State
The latent heat of fusion of ice is 80cal g\(^{-1}\). How much heat is required to change 10g of ice at 0ºC into water at the same temperature?
A
80 cal
B
10 cal
C
8 cal
D
800 cal
E
400 cal
medium Difficulty
Physics UTME / JAMB 1978 Current Electricity & Electric Circuits
A gas at pressure PNm\(^{-2}\) and temperature 27^\circC is heated to 77^\circC at constant volume. The new pressure is
A
0.85 PN-m-2
B
0.86 PN-m-2
C
1.16 PN-m-2
D
1.18 PN-m-2
E
2.85 PN-m-2
medium Difficulty
Physics UTME / JAMB 1978 Gas Laws & Heat Transfer
The heat from the sun reaches the earth by the process
A
insulation
B
precipitation
C
conduction
D
convection
E
radiation
medium Difficulty
Physics UTME / JAMB 1978 Current Electricity & Electric Circuits
Two resistors R1 and R2 are connected in parallel, R2 being greater than R1. The combined resistance is
A
less than R1
B
greater than R2
C
the sum of R1 and R2
D
the difference of R2 and R1
E
greater thanR1 but less than R2
medium Difficulty
Physics UTME / JAMB 1978 Current Electricity & Electric Circuits
Three 5 ohms resistors connected in parallel have a potential difference of 60v. applied across the combination. The current in each resistor is
A
4A
B
36A
C
12A
D
24A
E
10A
medium Difficulty
Physics UTME / JAMB 1978 Current Electricity & Electric Circuits
If NEPA charges 5k per kWhr, what is the cost of operating for 24 hours a lamp required 1A on a 200v line?
A
24k
B
55k
C
40k
D
26k
E
32k
medium Difficulty
Physics UTME / JAMB 1978 Magnetism, Electromagnetism & AC Circuits
A magnet is moved through a coil of wire. The e.m.f. produced in the wire depends on
A
the number of turns in the coil
B
the strength of the magnet
C
the speed at which the magnet is moved
D
all of the above
E
none of the above
medium Difficulty
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