A plane inclined at an angle of 30o to the horizontal has an efficiency of 60%. The force parallel to the plane required to push a load of 120N uniformly up the plane is
A60N
B100N
C120N
D200N
E240N
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Question 2212
jamb1984
If a solid changes directly into a gas when heat is applied the process is called
Avaporization
Bevaporation
Csublimation
Dionization
Econversion
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Question 2213
jamb1984
The lower and upper fixed points marked on a mecury-in-glass thermometer are 210mm apart. The end of the mercury column in the tube is 49mm above the lower fixed point in a room. What is the temperature of the room in degrees Celsius?
A55.3oC
B23.3oC
C49.0oC
D16.1oC
E76.7oC
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Question 2214
jamb1984
Dewpoint is the temperature at which, water vapour in the atmosphere
Aturns into steam
Bsolidifies into ice pellets
Cfirst condenses into liquid form
Dis just sufficient to cause cooling
Ehas a relative humidity of fifty percent
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Question 2215
jamb1984
One of two identical tuning forks with natural frequency 256Hz, one is loaded so that 4 beats per second are heard when they are sounded together. What is the frequency of the loaded tuning fork?
A260Hz
B252Hz
C248Hz
D264Hz
E258Hz
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Question 2216
jamb1984
Which of the following statements is (are) NOT correct? i. pressure changes do not affect the speed of sound in air ii. the velocity of sound increases with temperature iii. the quality of the note depends only on its frequency
Ai only
Bii only
Ciii only
Di and iii
Eii and iii
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Question 2217
jamb1984
When vibration occurs in air column, the distance between a node and an antinode is equal to
Aone-quarter of the wavelength
Bone-hall of the wavelength
Cthe wave length
Dtwice the wavelength
Efour-times the wavelength
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Question 2218
jamb1984
All the heat generated in a 5\(\Omega\) resistor by 2A flowing for 30 seconds is used to evaporate 5g of a liquid at its boiling point. Which of the following is the correct value of the specific latent heat of the liquid?
A120J
B60Jg-1
C120Jg-1
D1500J
E1500Jg-1
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Question 2219
jamb1984
Which of the following can be described as high tension transmission?
Ahigh resistance and low voltage
Blow current and high voltage
Chigh current and low voltage
Dhigh voltage and zero current
Ehigh current and low resistance
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Question 2220
jamb1984
Which of the following components is NOT contained in a dry cell? A
Acarbon rod
Bpaste of magnesium dioxide
Cpaste of ammonium chloride
Dzinc case
Ecopper rod
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Question 2221
jamb1984
Two cells each of e.m.f. 1.5V and an internal resistance 2\(\Omega\) are connected in parallel. Calculate the current flowing when the cells are connected to a 1\(\Omega\) resistor
A0.75\(\Omega\)
B1.5\(\Omega\)
C0.5\(\Omega\)
D1.0\(\Omega\)
E0.6\(\Omega\)
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Question 2222
jamb1984
The resistance of a wire depends on
Athe length of the wire
Bthe diameter of the wire
Cthe temperature of the wire
Dthe resistivity of the wire
Eall of the above
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Question 2223
jamb1984
The unit of quantity of electricity is called
Athe ampere
Bthe volts
Cthe coulomb
Dthe ammeter
Eelectromotive force
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Question 2224
jamb1984
For a concave mirror to form a teal diminished image, the object must be placed
Abehind the mirror
Bbetween the mirror and its focus
Cbetween the focus and the centre of curvature
Dat the centre of curvature
Eat a distance greater than the radius of curvature
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Question 2225
jamb1984
For correcting long sight defects in the human eye we require a
Aconverging lens
Bdiverging lens
Cmicroscope
Dperiscope
Eplain glass sheet
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Question 2226
jamb1984
What volume of alcohol with a density of 8.4 x 102kgm-3 will have the same mass as 4.2m3of petrol whose density is 7.2 x 102kgm-3?
A14m3
B3.6m3
C4.9m3
D5.0m3
E5.8m3
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Question 2227
jamb1984
For which of the underlisted quantities is the derived unit \(ML^2T^{-2}\) correct? i. moment of a force ii. work iii. acceleration
Ai only
Bii only
Ciii only
Di and ii
Eii and iii
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Question 2228
jamb1984
The distance travelled by a particle starting from rest is plotted against the square of the time elapsed from the commencement of motion. The resulting graph is linear, the slope of this graph is a measure of
Ainitial displacement
Binitial velocity
Cacceleration
Dhalf the acceleration
Ehalf the initial velocity
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Question 2229
jamb1983
The diagram above shows three circuits, the internal resistances of the batteries are negligible. which of the currents is the largest
AI1
BI2
CI3
DI4
EI5
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Question 2230
jamb1983
Which of the following figures gives the correct resultant R of two vectors P and Q?
