The difference between sound waves and light waves is that sound waves
Aare transverse while light waves are longitudinal
Brequire a medium to travel while light waves does not
Ccan be diffracted but light waves cannot
Dcannot be reflected but light waves can
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Question 42
jamb1995
The wavelength of signals from a radio transmitter is 1500mm and the frequency is 200kHz. What is the wavelength for a transmitter operating at 100kHz?
A7500m
B300m
C75m
D15m
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Question 43
jamb1995
Which of the following is the exclusive property of a transverse wave?
Adiffraction
Brefraction
Ccompression
Dpolarization
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Question 44
jamb1995
A well-lagged bar of length 100cm has its ends maintained at 100oC and 40oC respectively. What is the temperature at a point 60cm from the hotter end?
A58oC
B62oC
C64oC
D76oC
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Question 45
jamb1995
Which of the following statements give the TRUE difference between evaporation and boiling? i. Evaporation occurs at all temperatures while boiling occurs at a fixed temperature for a given pressure. ii. Evaporation is a surface phenomenon while boiling is an interior phenomenon. iii. Evaporation is affected by surface area while boiling is not.
Ai and ii only
Bi and iii only
Cii and iii only
Di, ii, iii.
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Question 46
jamb1995
A quantity of ice at 10oC is heated until the temperature of the heating vessel is 90oC. Which of the following constants is NOT required to determine the quantity of heat supplied to the vessel?
Aspecific heat capacity of ice
Bspecific heat capacity of water
Cspecific latent heat of fusion
Dspecific latent heat of vaporization
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Question 47
jamb1995
A temperature scale has a lower fixed point of 40mm and a upper fixed point of 200mm. What is the reading on this scale when a thermometer reads 60oC?
A33.3mm
B36.0mm
C96.0mm
D136.0mm
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Question 48
jamb1995
An electric kettle with negligible heat capacity is rated at 2000W. If 2.0kg of water is put in it, how long will it take the temperature of water to rise from 20OC to 100OC? [specific heat capacity of water = 4200Jkg-1k-1]
A420S
B336S
C168S
D48S
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Question 49
jamb1995
The equation PxVyTz = constant in charles' law when
Ax = 1, y = -1, z = 1
Bx = 0, y = 1, z = -1
Cx = 1, y = 0, z = -1
Dx = 0, y = 1, z = 1
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Question 50
jamb1995
A piece of wood floats inside water at room temperature with a fraction of it above the liquid surface. As the temperature of the water is raised, the part of the wood above the liquid will
Adecrease because the density of water decreases with temperature
Bincrease because the density of water decreases with temperature
Cdecreases because the density of water increases with water temperature
Dincrease because the density of water increases with temperature
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Question 51
jamb1995
A rectangular metal block of volume 10\(^{-6}\)m\(^3\) at 273k is heated to 573k. If its coefficient of linear expansion is 1.2 x 10\(^{-5}\)k\(^{-1}\), the percentage change of it volume is
A1.5%
B1.1%
C0.4%
D0.1%
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Question 52
jamb1995
Temperature is the measure of the
Aquantity of heat transferred into the molecules of an object
Bmean kinetic energy of the molecules of the object
Ckinetic energy of any individual molecule of the substance
Damount of work done by the molecules of the object
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Question 53
jamb1995
The volume of an air bubble increases from the bottom to the top of a lake at constant temperature because
Aatmospheric pressure acts on the surface of the lake
Bpressure increases with depth
Cdensity remains constant with pressure
Dthe bubble experiences an upthrust
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Question 54
jamb1995
A hydraulic press has a large circular piston of radius 0.8m and a circular plunger of radius 0.2m. A force of 500N is exerted by the plunger. Find the force exerted on the piston
A8000N
B4000N
C2000N
D31N
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Question 55
jamb1995
The energy contained in a wire when it extended by 0.02m by a force 500 N is
A5J
B10J
C103J
D104
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Question 56
jamb1995
Which of the following statements are TRUE about frictional force? i. it is always a disadvantage ii. it is sometimes a disadvantage iii. it always exist where there is a relative motion of two bodies that are in contact iv. it is sometimes very useful
Ai, iii only
Bi, iv only
Cii, iii only
Diii, iv only
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Question 57
jamb1995
A vehicle of mass m is driven by an engine of power P from rest. Find the minimum time it will take to acquire a speed
A\(\frac{mv^2}{2p}\)
B\(\frac{mv^2}{p}\)
C\(\frac{mv}{p}\)
D\(\frac{mv}{2p}\)
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Question 58
jamb1995
A uniform rod PQ of length 1m and mass 2kg is pivoted at the end p. If load of 14N is placed at the center of the rod, find the force that should be applied vertically upwards at Q to maintain the rod at equilibrium horizontally [g = 10ms-2]
A68N
B28N
C17N
D7N
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Question 59
jamb1995
A body is projected from the earth's surface with the intention of letting it escape from the earth's gravitational field. What is the minimum escape velocity of the body? [Earth's radius = 6.4 x 103km, g = 10ms-2]
A14 kms-1
B13 kms-1
C12 kms-1
D11 kms-1
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Question 60
jamb1995
What is the acceleration due to gravity 'g' on the moon, if g is 10-2 on the earth?
