In the series a.c circuit shown above, the p.d across the inductor is 8Vr.m.s and that across the resistor is 6Vr.m.s. The effective voltage is
A2V
B10V
C14V
D48V
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Question 2
jamb1999
In the diagram above, if the internal resistance of the cell is zero, the ration of the powers P1 and P2 dissipated by R1 and R2
AR2/R1
BR1/R2
CR1+R2/R1
DR1+R2/R2
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Question 3
jamb1999
In the circuit above, The potential across each capacitor is 100V. The total energy stored in the two capacitors is
A3.0 x 104J
B3.0 x 102J
C2.5 x 10-2J
D6.0 x 10-3J
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Question 4
jamb1999
In the circuit above, the ammeter reads a current of 5.0 A when R = 8Ω and reads 7.0A when R = 5Ω. The value of the unknown resistance X is
A10.0Ω
B7.5Ω
C5.0Ω
D2.5Ω
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Question 5
jamb1999
The diagram above shows a magnet X with its south pole moved along a soft - iron bar PQ in the direction shown. After some time, the poles at P and Q respectively are
ANorth - North
BNorth - South
CSouth - North
DSouth - South
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Question 6
jamb1999
The diagram above shows the prism arrangement in a
Abinocular
Bspectrometer
Cperiscope
Dprojector
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Question 7
jamb1999
The diagram above represents a transverse electromagnetic wave travelling with speed 3.0 x 108ms-1. What is the frequency of the wave.
A3.0 x 107Hz
B9.0 x 107Hz
C1.0 x 109Hz
D3.0 x 109Hz
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Question 8
jamb1999
In the J-tube above, Y and X are on the same horizontal level and 30cm3 of air is trapped above Y when the atmospheric pressure is 75cm Hg, calculate the volume of air trapped above Y when 15cm Hg is now poured into the limb above X
A15 cm3
B25 cm3
C35 cm3
D45 cm3
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Question 9
jamb1999
The diagram above shows a lift pump with valves at P and Q. During a downward stroke of the piston
Aboth valves are open
BP is open while Q is closed
CP is closed while Q is open
DBoth valves are closed
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Question 10
jamb1999
The diagram above shows a solid figure with base PQ and center of gravity G on a inclined plane. Which of the following statements is correct
AThe solid will fall over if the vertical line through G lies outside the base
BThe solid will fall over if the vertical line through lies inside the base
CThe solid will not fall over if the vertical line through G lies outside the base
DThe solid can never fall over
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Question 11
jamb1999
The figure above represents a frictionless pulley system in which a weight W is in equilibrium with a weight of 40N. Find the value of W
A13.3N
B20.0N
C40.0N
D80.0N
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Question 12
jamb1999
The diagram above shows the velocity-time graph of a vehicle. Its acceleration and retardation respectively are
A8.0 ms-2, 4,0 ms-2
B4.0 ms-2, 8.0 ms-2
C4.0 ms-2, 2.0 ms-2
D2.0 ms-2, 4.0 ms-2
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Question 13
jamb1999
If ∆x is the uncertainty in the measurement of the position of a particle along the x-axis and ∆Pa is the uncertainty in the measurement of the linear momentum along the x-axis, then the uncertainty principle relation is given as
A∆x ∆Px ≥ h
B∆x ∆Px = 0
C∆x ∆Px < h
D∆x ∆Px = ∞
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Question 14
jamb1999
if ∆x is the uncertainty in the measurement of the position of a particle along the x-axis and ∆Px is the uncertainty in the measurement of the linear momentum along the x-axis, then the uncertainty principle relation is given as
A∆x ∆Px ≥ h
B∆x ∆Px = 0
C∆x ∆Px < h
D∆x ∆Px = ∞
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Question 15
jamb1999
A semiconductor diode is used in rectifying alternating current into direct current mainly because it
Aallows current to flow in either direction
Bis non-linear
Coffers a high input resistance
Dallows current to flow only in one direction
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Question 16
jamb1999
2311Na + Proton → pqX + alpha particle
What are the values of p and q respectively in the equation above?
A10 and 20
B12 and 24
C20 and 10
D24 and 12
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Question 17
jamb1999
In the Rutherford scattering experiment, a beam of alpha particles was fired at a thin gold film with some of the particles being considerably deflected. This shows that
Aa gold nucleus contains protons, neutrons and electrons uniformly distributed in a tiny volume
Bthe gold nucleus is positively charged and is concentrated in a tiny volume
Cthe gold nucleus emitted alpha particles
Dthe gold nucleus is concentrated in a tiny volume and contains alpha particles
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Question 18
jamb1999
in a series R-L-C circuit at resonance, the voltages across the resistor and the inductor are 30V and 40V respectively, what is the voltage across the capacitor?
A30V
B40V
C50V
D70V
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Question 19
jamb1999
What is the speed of a particle of mass 10-27kg whose wavelength is 10-8m.
[h = 6.63 x 10-34Js]
A6.63ms-1
B66.30ms-1
C663.00ms-1
D6630.00ms-1
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Question 20
jamb1999
Gamma rays are produced when
Ahigh velocity electrons are abruptly stopped in metals
Benergy changes occur within the nucleus of atoms
Cenergy changes occur within the electronic structure of atoms
Delectrons are deflected in very strong magnetic fields
