An object floats in a fluid when it displaces it's
Avolume of liquid in which it floats
Bmass of fluid in which it foats
Cweith of fluid in which it foats
Ddensity of fluid in which it foats
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Question 273
waec2015
The barometric reading at a place is 73.5m Hg. Calculate the pressure at a point 30m below the surface of water contained in a reservoir at the place. [g = 10ms\(^{-2}\), density of mercury = 1.2 x 10\(^4\)kg m\(^{-3}\), density of water = 1.0 x 10\(^3\)m\(^{-3}\)]
A4.0 x 105 Nm-2
B3.0 x 10 5 Nm-2
C2.0 x 105 Nm-2
D1.0 x 105 Nm-2
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Question 274
waec2015
Which of the following units is derived?
Akg
Bm
CK
DN
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Question 275
waec2015
Materials that can be stretched and still return to their original forms when the stresses are removed are said be
Aelastic
Belastomer
Cplastic
Dthermoplastic
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Question 276
waec2015
Which of the following statements about mass and weight are correct? i. Weight is the force of gravity on a body. ii. The mass of a body is the quantity of matter in the body. iii. The weight of a body is greatest at the equator. iv. The mass of a body is greatest at the poles
Ai and ii only
Bi and iii only
Cii and iv only
Diii and iv only
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Question 277
waec2014
An element of nucleon number P and atomic number Q emits an alpha particle from its nucleus. The resultant numbers of the new element formed are respectively
AP - 4 and Q + 2
BP - 4 and Q - 2
CP + 2 and Q + 2
DP + 2 and Q - 2
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Question 278
waec2014
An aluminum foil is placed across a beam of radiation from a radioactive source. Which of the following types of radiation will be stopped by it?
Aalpha and beta particles
Balpha and gamma particles
Cbeta and gamma particles
Dgamma particles only
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Question 279
waec2014
Which of the following statements is the major advantage of nuclear fusion over nuclear fission?
Anuclear fusion releases more energy
Bmore neutrons are released in fusion than in fission
Cfussion does not release as much dangerous radiation as fission
Dfusion reactions occur more readily than fission
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Question 280
waec2014
The energy required to separate the nucleus in an atom completely is known as
Amass defect of the atom
Belectron binding energy
Cexcitation energy
Dnuclear binding energy
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Question 281
waec2014
The circuit above illustrates a standard resistor R, voltage source E and a lamp L connected in series. If the temperature of R is increased, the brightness of the lamp will
Aincrease sharply
Bdecrease slightly
Cremains the same
Dincrease gradually
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Question 282
waec2014
A transformer has 400 turns of wire in the primary coil and 40 turns in the secondary col. If the input voltage is 150 volts. Calculate the magnitude of the output voltage
A150V
B55V
C36V
D15V
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Question 283
waec2014
A wire of length 100 cm has a resistance of 10\(\Omega\). If its cross-sectional area is 0.005cm2, determine its resistivity
A0.0005\(\Omega\)cm
B0.0015\(\Omega\)cm
C0.0016\(\Omega\)cm
D0.0700\(\Omega\)cm
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Question 284
waec2014
In the circuit diagram above, E is a battery of negligible internal resistance. If its emf is 9.0V. Calculate the current in the circuit ``
A1.8A
B1.0A
C0.8A
D0.3A
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Question 285
waec2014
Two identical charges situated 20cm apart in vacuum repel each other with a force of 1.0N.Calculate the value of each other with a force of 1.0N. Calculate the value of each charge. [(14 \(\pi \varepsilon_o)^{-1}\) = 9 x 109Nm2C-2]
A21\(\mu C\)
B3.6\(\mu C\)
C4.0\(\mu C\)
D4.4\(\mu C\)
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Question 286
waec2014
A 15 \(\mu F\) capacitor is connected to a 240V, 50Hz ac. source. Calculate the reactance of the capacitance [\(\pi = 3.142\)]
A16\(\Omega\)
B68\(\Omega\)
C106\(\Omega\)
D212\(\Omega\)
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Question 287
waec2014
An electric motor converts
Aelectrical energy to mechanical energy
Bmechanical energy to electrical energy
Cmechanical energy to chemical energy
Delectrical energy to thermal energy
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Question 288
waec2014
Which of the following conditions occur at resonance in a series RLC circuit? i. Impedance equals resistance ii. Current is maximum iii. Reactance is maximum iv. Current and voltage are 90° out of phase
Ai and ii only
Bi and iii only
Ci, ii and iii only
Di, ii, iii and iv
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Question 289
waec2014
The energy stored in a simple cell is
Aelectrical
Bnuclear
Cthermal
Dchemical
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Question 290
waec2014
In an ac circuit when the supply voltage frequency is equal to the resonant frequency, the current
