An elastic material has a length of 36cm when a load of 40N is hung on it and a length of 45cm when a load of 60N is hung on it. The original length of the string is
A12cm
B20cm
C18cm
D15cm
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Question 52
jamb2005
If two inductors of inductances 3H and 6H are arranged in series, the total inductance is
A9.0H
B18.0H
C0.5H
D2.0H
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Question 53
jamb2005
A force of 200N acts between two objects at a certain distance apart. The value of the force when the distance is halved is
A400N
B200N
C100N
D800N
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Question 54
jamb2005
The velocity of sound in air will be doubled if it's absolute temperature is
AQuadrupled
BConstant
CHalved
DDoulbed
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Question 55
jamb2005
If the distance between two point charges its increased by a factor of four, the magnitude of the electrostatic force between them will be
A1/4 of its former value
B1/16 of its former value
C1/2 of its former value
D4 times its former value
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Question 56
jamb2005
The figure above shows three capacitors, 2μF, 3μF and 6μF connected in series. If the p.d across the system is 12V, the p.d, across the 6μF capacitor is
A4V
B12V
C2V
D6V
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Question 57
jamb2005
106J of heat is required to boil off completely 2kg of a certain liquid. Neglecting heat lost to the surroundings, the latent heat of vaporization of the liquid is
A2.0 x 106J kg-1
B5.0 x 106J kg-1
C2.0 x 105J kg-1
D5.0 x 105J kg-1
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Question 58
jamb2005
Two liquids L1 and L2 are contained in a U - tube. The height and the density of L1 are 8 cm and 103 kgm-3 respectively. If the density of L2 is 800 kgm-3, its height measured from the same level is
In the circuit diagram of a transistor above, the terminal P, Q and R represent
AEMITTER, BASE and COLLECTOR
BCOLLECTOR, EMITTER and BASE
CBASE, COLLECTOR and EMITTER
DBASE, ENITTER and COLLECTOR
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Question 61
jamb2005
In the figure above, the work done by the force of 100N inclined at an angle of 60o to the object dragged horizontally to a distance of 8m is
A800J
B600J
C100J
D400J
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Question 62
jamb2005
If the system above is in equilibrium, the tension in the string Q is
A11N
B9N
C4N
D6N
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Question 63
jamb2005
In the figure above, the coefficient of static friction is 0.5. If the tension in the string is T, the acceleration of the system in motion is
A5 ms-2
B15 ms-2
C3 ms-2
D9 ms-2
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Question 64
jamb2005
The value of F in the figure above when in equilibrium is
A10N
B12N
C20N
D27N
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Question 65
jamb2005
The figure above shows a plot of angles of deviation through a glass prism when light is incident at θ degrees on the prism. The incident angle that produces the minimum deviation is
A20o
B18o
C35o
D25o
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Question 66
jamb2005
The resistance of a piece of wire of length 20m has crossed-sectional area 8 x 10\(^{-6}\)m\(^2\)is?
[Resistivity of the wire = 4 x 10\(^{-7}\) Ω m]
A5.0 Ω
B0.5 Ω
C10.0 Ω
D1.0 Ω
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Question 67
jamb2005
Two charged particles are projected into a region where there is a magnetic field perpendicular to their velocities. if the charges are deflected in opposite directions, which of the following statements is true of the charge?
Athe charge must be of opposite sign
Bpositive charges are more in number
Cthe charges are electrically neutral
Dthe charges are of the same sign
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Question 68
jamb2005
The electric field intensity in a place where a charge of 10-10c experiences a force of 0.4N is?
A4.0 x 107 NC-1
B8.0 x 109 NC-1
C8.O x 10-12 NC-1
D4.0 x 109 NC-1
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Question 69
jamb2005
A car battery rated 45 A H is charged with a charger whose rating is 2.5A.How long will it take to charge the battery full?
A10 hrs
B18 hrs
C20 hrs
D25 hrs
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Question 70
jamb2005
The north pole of a magnet can never be separated from the south pole because of the property knowledge as?
