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Physics WAEC / WASSCE 1996 Current Electricity & Electric Circuits
Two spanners X and Y of lengths 15cm and 20cm respectively are used in turn to give a screw of pitch 2mm one complete rotation. If Rx and Ry are the respective velocity ratios of the spanners then the ratio Rx : Ry is
A
1 : 50
B
3 : 20
C
3:4
D
4:3
E
20:3
medium Difficulty
Physics WAEC / WASSCE 1996 Temperature, Thermometry & Thermal Expansion
A platinum-resistance thermometer has a resistance of 5\Omega at 0^\circC and 9\Omega at l00^\circC. Assuming that resistance changes uniformly with temperature, calculate the resistance of the thermometer when the temperature is 45^\circC.
A
13.9 Ω
B
8.9 Ω
C
6.8 Ω
D
3.2 Ω
E
1.8 Ω
medium Difficulty
Physics WAEC / WASSCE 1996 Temperature, Thermometry & Thermal Expansion
The linear expansivity of a metal P is twice that of another metal Q. When these materials are heated through the same temperature change, their increase in length is the same. Calculate the ratio of the original length of P to that of Q.
A
1:4
B
1:2
C
2:1
D
4:1
E
6:1
medium Difficulty
Physics WAEC / WASSCE 1996 Current Electricity & Electric Circuits
The pressure of a fixed mass of gas is 2.0 x 105Nm-2 at a known temperature. Assuming that the temperature remains constant, what will be the pressure of the gas if its volume is halved?
A
1.0x105Nm-2
B
2.0X105Nm-2
C
3.0x105Nm-2
D
4.0 x105Nm-2
E
5.0 x105Nm-2
medium Difficulty
Physics WAEC / WASSCE 1996 Work, Energy, Power & Simple Machines
Which of the following statements is not correct?
A
Heat energy can be transformed into mechanical energy
B
That total heat content of a body is the sum of the kinetic energies of its molecules
C
lf a body is heated, its molecules move faster.
D
lf a body is cooled, molecular movement remains constant.
medium Difficulty
Physics WAEC / WASSCE 1996 Calorimetry, Latent Heat & Change of State
A 400W immersion heater is used to heat a liquid of mass 0.5kg. lf the temperature of the liquid increases by 2.5oC in one second, calculate the specific heat capacity of the liquid (Neglect heat losses to the surroundings)
A
80 Jkg-1K-1
B
320Jkg-1K-1
C
500Jkg-1K-1
D
1200J kg-1K-1
E
2000J kg-1K-1.
medium Difficulty
Physics WAEC / WASSCE 1996 Calorimetry, Latent Heat & Change of State
What is the difference in the amount of heat given out by 4kg of steam and 4kg of water when both are cooled from 100oC to 80oC? (Specific latent heat of steam = 2.260,000J kg-1) (Specific heat capacity of water =4,200 J kg-1)
A
336,000J
B
672,000J
C
8,704,000J
D
9,040,000J
E
9,376,000J
medium Difficulty
Physics WAEC / WASSCE 1996 Current Electricity & Electric Circuits
The heating element in an electric kettle is usually located near the bottom of the kettle because
A
water is a good conductor of heat
B
heat can be more quickly radiated to all parts of the water
C
no heat can be lost to the surroundings
D
the convectional currents which are set up can carry heat to all parts of the water
E
the molecules of the heating element can carry heat to all parts of the water.
medium Difficulty
Physics WAEC / WASSCE 1996 Gas Laws & Heat Transfer
The inside of a vacuum flask is usually coated with silver to reduce heat lost by
A
convection
B
conduction
C
radiation
D
absorption
E
evaporation
medium Difficulty
Physics WAEC / WASSCE 1996 Calorimetry, Latent Heat & Change of State
The saturated vapour pressure of a liquid increases as the
A
volume of the liquid increases
B
volume of the liquid decreases
C
temperature of the liquid increases
D
temperature of the liquid decreases
E
mass of the liquid decreases
medium Difficulty
Physics WAEC / WASSCE 1996 Current Electricity & Electric Circuits
Cloud formation is the direct result of
A
precipitation
B
vaporization
C
fusion
D
sublimation
E
condensation
medium Difficulty
Physics WAEC / WASSCE 1996 Calorimetry, Latent Heat & Change of State
Water boils at a lower temperature when heated at the top of a mountain than at sea-level because at the top of the mountain the
A
saturation vapour pressure of water is higher than at sea-level
B
sun adds more heat to the water
C
temperature is lower than at sea- level
D
relative humidity of the atmosphere is lower
E
pressure of the atmosphere is lower
medium Difficulty
Physics WAEC / WASSCE 1996 Calorimetry, Latent Heat & Change of State
The main reason why rice cooks faster in a pressure cooker than in cooking pot is that
A
less heat escapes from the cooker
B
the vapour pressure in the cooker is constant
C
the rice is not affected by the draught over the cooker
D
the vapour pressure in the cooker decreases
E
the boiling point of water in the cooker is raised.
medium Difficulty
Physics WAEC / WASSCE 1996 Current Electricity & Electric Circuits
In which of the following media would sound waves travel fastest?
A
Kerosine
B
Alcohol
C
Water
D
lron
E
Air
medium Difficulty
Physics WAEC / WASSCE 1996 Reflection, Refraction & Dispersion of Light
A ray of light strikes a plane mirror at a glancing angle of 50o. Calculate the angle between the incident and reflected rays
A
20o
B
40o
C
50o
D
80o
E
100o.
medium Difficulty
Page 1439 of 1989