From the diagram above, calculate the energy stored in the capacitor
A4.0 x 10\(^{-2}\)J
B4.0 x 10\(^{-4}\)J
C8.0 x 10\(^{-4}\)J
D8.0 x 10\(^{-2}\)J
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Question 322
jamb2017
How can energy loss be minimized through Eddy-current?
ABy using high resistance wire
BBy using insulated soft iron wires
CBy using low resistance wires
DBu using turns of wires
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Question 323
jamb2017
A string of length 5cm is extended by 0.04m when a load of 0.8kg is suspended at the end. How far will it extend if a force of 16N is applied? [g = 10ms\(^{-2}\)]
A0.04m
B0.12m
C0.01m
D0.08m
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Question 324
jamb2017
Determine the focal length of a thin converging lens if the power is 5.0 dioptres
A0.1 m
B0.2 m
C2.0 m
D2.5 m
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Question 325
jamb2017
Which of the following is a scalar quantity?
ATension
BWeight
CImpulse
DMass
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Question 326
jamb2017
A radio station broadcast at a frequency of 600KHZ. If the speed of light in air is 3 × 108ms\(^{−1}\). Calculate the wavelength of the radio wave
A2.20 × 10\(^3\)m
B5.0 × 10\(^2\)m
C5.0 × 10\(^5\)m
D11.8 × 10\(^{11}\)m
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Question 327
jamb2017
A man of mass 50kg ascends a flight of stains 5m high in 5 seconds. If acceleration due to gravity is 10ms\(^{-2}\) the power expended is
A100w
B200w
C400w
D500w
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Question 328
jamb2017
The instrument used to measure the pressure of a gas is
Abarometer
Bthermometer
Chydrometer
Dmanometer
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Question 329
jamb2017
The net capacitance in the circuit above is
A80µF
B6.0µF
C4.0µF
D2.0µF
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Question 330
jamb2017
Which of the following operations can be used to convert an alternative current dynamo into a direct current dynamo
Anumber of turns in the coil is increased
Bstrength of the field magnet is increased
Cslip rings are replaced with split ring commutator
Dcoil is wound on a soft iron armature
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Question 331
jamb2017
When the r.m.s value of a source of electricity supply is given as 240v, it means that the peak value of the supply is
A240v
B340v
C480v
D57600v
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Question 332
jamb2017
When two objects P and Q are supplied with the same quantity of heat, the temperature change in P is observed to be twice that of Q. The mass of P is half that of Q. The ratio of the specific heat capacity pf P to Q is
A1:4
B4:1
C1:1
D2:1
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Question 333
jamb2017
Calculate the height of the image formed by a pinhole camera of length 12cm used to photograph an object 60cm away from the hole and 70cm high
A10 cm
B16 cm
C5 cm
D14 cm
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Question 334
jamb2017
The S.I unit of moment of a force is
Akgm
BNm
CJm
Dµm\(^{-1}\)
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Question 335
jamb2017
An element and its isotope only differ in the number of
Aprotons
Belectrons
Cions
Dneutrons
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Question 336
jamb2017
Which of the following instruments helps to maintain the correct humidity and temperature of a building?
AA compressor
BA refrigerator
CAir blower
DAir conditioner
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Question 337
jamb2017
Three 3ω resistance are connected in parallel what is the equivalent resistance?
A1ω
B9ω
C3ω
D0.33ω
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Question 338
jamb2017
A block and tackle pulley arrangement has 6 pulleys in which an effort of 50N supports a load of 200N, calculate the efficiency of the machine
A80.0%
B76.6%
C66.7%
D60.7%
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Question 339
jamb2017
Which of the following statements is NOT correct?
AMolecules of a liquid are stationary
BBrownian motion is an evidence of particle nature of matter
CMatter is made up of molecules
DThe molecules of matter are in constant motion
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Question 340
jamb2017
A cell of internal resistance 2Ω supplies current to a 6Ω resistor. The efficiency of the cell is
