I. change of state
II. Diffusion
III. Radiation
IV. Osmosis
which of the processes above can be explained using the kinetic theory?
AI, II,III and IV
BI, II and III
CI, III and IV
DI, II and IV
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Question 842
jamb2011
Steam burn is more severe than that of boiling water because
Asteam burn is independent of relative humidity
Bsteam possesses greater heat energy per unit mass
Cwater boils at a higher temperature
Dsteam burn is dependent on relative humidity
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Question 843
jamb2011
A block of aluminum is heated electrically by a 30 w heater if the temperature rises by 10°c in 5 minutes, the heat capacity of the aluminum is
A900 JK-1
B90 JK-1
C100 JK-1
D200 JK-1
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Question 844
jamb2011
The phenomenon that shows that increase in pressure lowers the melting point can be observed in
Asublimation
Bcondensation
Ccoagulation
Dregelation
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Question 845
jamb2011
A cannon is fired from town X,after how long is the sound heard at a town Y 4.95 km away?
[velocity of sound in the air = 330 ms-1]
A30 s
B10 s
C10 s
D15 s
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Question 846
jamb2011
The ground is always cold at night because the
Aatmosphere absorbs the sun's energy at night
Bearth radiates heat to the atmosphere at night
Csun no longer shine at night
Datmosphere reflects the sun's energy at night
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Question 847
jamb2011
A perfect emitter or absorber of radiant energy is a
Aconductor
Bblack body
Cwhite body
Dred body
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Question 848
jamb2011
Which of the following electromagnetic waves has the highest frequency?
Autra - violet rays
Bradio waves
Cx - rays
Dinfrared - rays
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Question 849
jamb2011
Which of the following types of waves needs a medium for propagation?
Asound waves
Blight waves
Cradio waves
Dx - rays
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Question 850
jamb2011
Which of the following could be effectively used to reduce friction?
Akerosene
Bgrease
Cwater
Dpetrol
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Question 851
jamb2011
I. Density of the liquid.
II. Depth below the surface of the liquid.
III. Surface area of the liquid.
In which of the statement above will pressure be dependent?
AI and II only.
BII and III only.
CI, II and III only.
DI and III only.
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Question 852
jamb2011
A machine is used to lift a load of 20 N through a height of 10 m. if the efficiency of the machine is 40%, how much work is done?
A80 J
B500 J
C300 J
D120 J
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Question 853
jamb2011
I. High thermal capacity.
II. High sensitivity.
III.Easy readability.
IV. Accuracy over a wide range of temperature
From the statement above, the qualities of a good thermometer are
AI and II
BI, II,III and IV
CI, III and IV
DII, III and IV
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Question 854
jamb2011
A copper wire was subjected to a tensile stress of 7.7 x 10\(^7\). Calculate the strain of the wire.
[Young modules = 1.1 x 10\(^11\) Nm\(^{-2}\)]
A2. 0 x 10-5
B7.0 x 10-3
C7.0 x 10-4
D2.2 x 10-4
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Question 855
jamb2011
A metal of volume 40 cm\(^3\) is heated from 30 °c to 90 °c, the increase in volume is
[Linear expansivity of the metal = 2.0 x 10\(^{-5}\)K\(^{-1}\)]
A0.12 cm3
B4.00 cm3
C1.20 cm3
D0.40 cm3
Eno correct option
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Question 856
jamb2011
An object weighs 22 kg in water and 30kg in air. what is the upthrust exerted by the liquid on the object.
[g = 10 ms2]
A50 N
B520 N
C220 N
D80 N
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Question 857
jamb2011
If a tube of small radius opened at both ends is placed in a liquid, the liquid will
Aremain at the same level irrespective of whether the liquid wet the glass or not
Bfall below the liquid level if the liquid wets the glass
Cfalls below the liquid level if the liquid does not wet the glass
Drise above the liquid level if the liquid does not wet the glass
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Question 858
jamb2011
A carpenter on top of a roof of 20.0m high dropped a hammer of mass 1.5 kg and it fell directly to the ground. the kinetic energy of the hammer just before hitting the ground is?
[g = 10 ms-2]
A600 J
B150J
C300 J
D450 J
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Question 859
jamb2011
An object of mass 2 kg moves with a velocity of 10 ms1 round at circle of radius 4 m. Calculate the centripetal force on the object
A25 N
B100 N
C50 N
D40 N
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Question 860
jamb2011
If it takes an object 3s to fall freely to the ground from a certain height, what is the distance covered by the object?
