A radioactive source emits X–rays of very short wavelength (10\(^{-13}\)m ). What is the frequency of these rays?
A2 × 1018HZ
B3 × 10 19HZ
C3 × 1021HZ
D3 × 10-19HZ
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Question 372
jamb2015
The symbol −10X used to represent which of the particles?
AProton
BNeutron
CElectrons
DAtoms
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Question 373
jamb2015
The optical instrument which is suitable for viewing a nearby objects is ………..?
ATelescope
Bsextant
Cmicroscope
Dperiscope
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Question 374
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If an object whose mass is 3kg moves in a circular path of a radius 0.7m, records a speed at 2m/s. What is the result of the angular velocity?
A4 rads–1
B1rads–1–1
C3–1rads–1
D4rads–1–1
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Question 375
jamb2015
A structural engineer stood on a top of a building releasing a light and heavy object to the ground which of the following statement is true?(Neglect Air Resistance)
ABoth the light and heavy subject reach the ground at the same time
BThe light object get to the ground first before the heavy object
CThe heavy object to the ground first before the light object
DNone get to the ground first
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Question 376
jamb2015
For a best result using temperature to achieve an accurate measurement, it is best to use
AMercury thermometer
Bgas thermometer
Cclinical thermometer
Dalcohol thermometer
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Question 377
jamb2015
If the mechanical advantage of a machine is 4. What is its ratio for LOAD to EFFORT?
A4:01
B1:04
C5:01
D2:01
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Question 378
jamb2015
If the velocity ratio of a machine is 5. What is its ratio of x and y?
A2 : 5
B1 : 5
C5 : 1
D3 : 1
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Question 379
jamb2015
If a ball released from a height of 20m, How long would it take the ball to reach the ground? (assures g = 10m/s)
A2sec
B3sec
C35sec
D2.4sec
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Question 380
jamb2015
A zinc has a heat capacity of 40 J/K, what is the mass of the zinc, given that the specific heat of zinc is 380 J/kg k
A0.11kg
B0.12kg
C0.13kg
D0.14kg
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Question 381
jamb2015
If a mango fruit dropped at a height of 50 meters. How long does it reach the ground? (take g = 10m/s2)
A2 sec
B3 sec
C4sec
D3.2sec
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Question 382
jamb2015
What type of electromagnetic radiation can be used to take photographs in the haze?
ARadio waves
Binfrared rays
CVisible light
DGamma rays
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Question 383
jamb2015
Lodestone is a natural magnet, it points at
AN – W when suspended freely
BN–S when suspended freely
CS – E when suspended freely
DS–W when suspended freely
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Question 384
jamb2015
Quantities of heat Q can be measured using a container called
AThermometer
BMeasuring cylinder
CCalorimeter
DMeter rule
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Question 385
jamb2015
Heat transfer in the surrounding without a material medium is possible through?
AConduction
BConvection
CRadiation
DExpansion
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Question 386
jamb2015
The device in which one circuit controls another, especially if the current in the second circuit is large or dangerous is known as
AElectromagnetic devices
BMagnetic relay device
CNone at all
DSextant
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Question 387
jamb2015
At what respective value of a, b, and c would the unit of work, the joule, be dimensionally similar to Ma Lb Tc?
A1, – 2, 1
B1, 2, – 2
C1, 1, –2
D2, 2, 1
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Question 388
jamb2015
The compressed regions and the space-out regions in longitude wave are refers to as
ACompression and Rarefaction
BComparison and Explosion
CReflection only
DRefraction only
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Question 389
jamb2015
Radio waves belong to the class of wave whose velocity is about
A34m/s
B3 ×106m/s
C3 ×108m/s
D3 × 10-8m/s
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Question 390
jamb2015
A member of the crew of a SPACESHIP experiences weightlessness in a space when they
