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)
A80 Jkg-1K-1
B320Jkg-1K-1
C500Jkg-1K-1
D1200J kg-1K-1
E2000J kg-1K-1.
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Question 1722
waec1996
Which of the following statements is not correct?
AHeat energy can be transformed into mechanical energy
BThat total heat content of a body is the sum of the kinetic energies of its molecules
Clf a body is heated, its molecules move faster.
Dlf a body is cooled, molecular movement remains constant.
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Question 1723
waec1996
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?
A1.0x105Nm-2
B2.0X105Nm-2
C3.0x105Nm-2
D4.0 x105Nm-2
E5.0 x105Nm-2
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Question 1724
waec1996
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.
A1:4
B1:2
C2:1
D4:1
E6:1
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Question 1725
waec1996
A platinum-resistance thermometer has a resistance of 5Ω at 0°C and 9Ω at l00°C. Assuming that resistance changes uniformly with temperature, calculate the resistance of the thermometer when the temperature is 45°C.
A13.9 Ω
B8.9 Ω
C6.8 Ω
D3.2 Ω
E1.8 Ω
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Question 1726
waec1996
Two simple pendula x and y make 400 and 500 oscillations respectively in equal time. If the period of oscillation of x is 1.5 seconds, what is the period of oscillation of y?
A0.53s
B0.83s
C1.20s
D1.50s
E1.88s.
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Question 1727
waec1996
A stationary object of mass 4kg is set in motion by a net force of 5ON. If the object attains is speed of 5ms-1 in time. Calculate the value of t.
A0.20s
B0.40s
C0.63s
D0.80s
E1.30s
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Question 1728
waec1996
A body of mass 2kg is suspended from the ceiling of a lift with a light inextensible string. lf the lift moves upwards with acceleration of 2ms-2, calculate the magnitude of the tension in the string (g = 1Oms-2)
A24N
B20N
C16N
D4N
E0N
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Question 1729
waec1996
A body of mass 4.2kg moving with velocity 10ms-1 due east, hits a stationary body of mass 2.8kg. If they stick together after collision and move with velocity V due east, calculate the value of V
A3ms-1
B6ms-1
C7ms-1
D15ms-1
E17ms-1
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Question 1730
waec1996
The magnitude of the force required to make an object of mass M move with speed V in a circular path of radius R is given by the expression.
Amr/v
B(mr) 2/v
Cmv2/r
Dmv/2
Emv/r
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Question 1731
waec1996
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
A1 : 50
B3 : 20
C3:4
D4:3
E20:3
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Question 1732
waec1996
The velocity ratio and efficiency of a system of pulleys are 6 and 80% respectively. How much effort is required to lift a load of mass 120kg with this system? (g=10ms-2)
A25N
B90N
C96N
D250N
E960N
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Question 1733
waec1996
A rocket is launched from the surface of the earth. If the radius of the earth is 6.4 x 106m and the acceleration of free fall due to gravity is 1Oms-1 calculate the escape velocity of the rocket.
A2.53 x 104ms-1
B1.13 x 104ms
C8.00 x 103ms-1
D4.23 x 103ms-1
E6.41 x 104ms-1
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Question 1734
waec1996
A ball of mass 5.0kg hits a smooth vertical wall normally with a speed of 2ms-1 and rebounds with the same speed. Determine the impulse experienced by the ball
A20.0kg ms-1
B10.0kg ms-1
C5.0kg ms-1
D1.3kg ms-1
E0.0kg ms-1.
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Question 1735
waec1996
The diagram above illustrates the velocity-time graph of the motion of a body. Calculate the total distance covered by the body
A50m
B65m
C175m
D225m
E300m
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Question 1736
waec1996
A loaded test-tube which floats upright in water is carefully and slightly depressed and then released. Which of the following best describes the sub-sequent motion of the test-tube?
ACircular
BRotational
CRandom
DOscillatory
ETranslational
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Question 1737
waec1996
The diagram above represents a portion of a micrometer screw gauge in which the horizontal scale is in millimetres. What is the reading on the instrument?
A3.72mm
B3.50mm
C3.30mm
D3.28mm
E3.22mm
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Question 1738
waec1995
Which of the following is used for shielding radioactive fall-outs?
APlastic
BWood
CTextile
DAluminium
ELead
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Question 1739
waec1995
Which of the following cannot be explained by the molecular theory of matter?
AConduction
BRadiation
CConvection
DEvaporation
EExpansion
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Question 1740
waec1995
Which of the following is not a product of nuclear fission?
