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Physics WAEC / WASSCE 1990 Elasticity, Density, Pressure & Fluids
Water does not drip through an open umbrella of silk material unless the inside of the umbrella is touched. Which of the following phenomena is responsible for this?
A
Surface tension
B
Hydrostatic upthrust
C
Viscosity
D
Diffusion
E
Osmosis
medium Difficulty
Physics WAEC / WASSCE 1990 Atomic, Quantum, Nuclear Physics & Electronics
A radioactive substance has a half-life of 20 hours. What fraction of the original radioactive nuclei will remain after 80 hours?
A
1/32
B
1/16
C
1/8
D
1/4
E
1/2
medium Difficulty
Physics WAEC / WASSCE 1990 Atomic, Quantum, Nuclear Physics & Electronics
A metal is illuminated with a radiation of energy 6.88eV If the kinetic energy of the emitted electrons is 1.5OeV, calculate the work function of the metal.
A
0.22eV
B
4.59eV
C
5.38eV
D
8.38eV
E
10.32eV
medium Difficulty
Physics WAEC / WASSCE 1990 Elasticity, Density, Pressure & Fluids
Viscosity in a liquid does not depend on the
A
nature of the liquid
B
relative velocity between the liquid layers
C
area of the surfaces in contact
D
temperature of the liquid
E
normal reaction between the liquid layers
medium Difficulty
Physics WAEC / WASSCE 1990 Current Electricity & Electric Circuits
Which of the following is not crystal?
A
Sodium chloride
B
Lead
C
Copper (II) tetraoxosulphate (VI)
D
Glass
E
Germanium
medium Difficulty
Physics WAEC / WASSCE 1990 Current Electricity & Electric Circuits
What is the difference between a crystalline and an amorphous solid? A crystalline solid
A
has cubic structure while amorphous solid has hexagonal structure
B
has regularly-repeating pattern while an amorphous solid has not
C
is white while amorphous solid is yellow
D
is always hard while amorphous solid is always soft
E
melts on heating while an amorphous solid sublimates on heating.
medium Difficulty
Physics WAEC / WASSCE 1990 Waves, Sound & Vibrations
Which of the following is not an evidence of the particle nature of matter?
A
Diffusion
B
Brownian motion
C
Diffraction
D
Crystal structure
E
Photoelectricity
medium Difficulty
Physics UTME / JAMB 1990 Units, Measurements & Dimensional Analysis
Which of the following is a fundamental unit?
A
Newton
B
Watt
C
Joule
D
Second
medium Difficulty
Physics UTME / JAMB 1990 Current Electricity & Electric Circuits
A particle of mass M which is at rest splits up into two. If the mass and velocity of one of the particles are m and v respectively, calculate the velocity of the second particle
A
\(\frac{mv}{M}\)
B
\(\frac{Mv}{M - m}\)
C
\(\frac{mv}{M + m}\)
D
\(\frac{mv}{M - m}\)
medium Difficulty
Physics UTME / JAMB 1990 Current Electricity & Electric Circuits
Which of the following statements are correct about an object in equilibrium under parallel forces? i. the total clockwise moments of the forces about any point equals the total anti-clockwise moments about the same point. ii. the total forces in one direction equals the total forces in the opposite direction. iii. the resolved components along the x-axis equals the resolved components along the y-axis.
A
i and ii only
B
i and iii only
C
ii and iii
D
i, ii, and iii only
medium Difficulty
Physics UTME / JAMB 1990 Current Electricity & Electric Circuits
To keep a vehicle moving at a constant speed v, requires power P, from the engine. The force provided by the engine is
A
\(\frac{p}{v}\)
B
\(\frac{1}{2}\) v
C
pv
D
\(\frac{p}{v^2}\) v
medium Difficulty
Physics UTME / JAMB 1990 Work, Energy, Power & Simple Machines
A stone of mass m kg is held h meters above the floor for 50s. The work done in joules over this period is
A
mh
B
mgh
C
\(\frac{mgh}{50}\)
D
O
medium Difficulty
Physics UTME / JAMB 1990 Newton's Laws, Momentum & Collisions
A body of mass 10kg rests on a rough inclined plane whose angle of tilt \(\theta\) is variable. \(\theta\) is gradually increased until the body starts to slide down the plane at 30o. The coefficient of limiting friction between the body and the plane
A
0.30
B
0.50
C
0.58
D
0.87
medium Difficulty
Physics UTME / JAMB 1990 Work, Energy, Power & Simple Machines
An inclined plane which makes an angle of 30o with the horizontal has a velocity ratio of
A
2
B
1
C
0.866
D
0.50
medium Difficulty
Physics UTME / JAMB 1990 Elasticity, Density, Pressure & Fluids
What is the length of liquid column in a barometer tube that would support an atmospheric pressure of 102000Nm-2 if the density of the liquid is 2600kgm-3? [g = 10ms-2]
A
0.75m
B
0.76m
C
3.92m
D
39.23m
medium Difficulty
Page 1684 of 1989