I. Rays of light travel from a less dense medium to a denser medium. II. The Angle of incidence is greater than critical angle. III. Rays of light travel from a denser medium to a less dense medium. Which of the statements above are conditions for total internal reflection to occur?
AI & II only
BI & III only
CII & III only
DII only
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Question 32
jamb2012
A glass block of thickness 10cm is placed on an object. If an observer views the object vertically, the displacement of the object is
A3.33cm
B5.00cm
C6.67cm
D8.50cm
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Question 33
jamb2012
After reflection from the concave mirror, rays of light from the sun converges
Aat the radius of curvature
Bat the focus
Cbeyond the radius of curvature
Dbetween the focus and radius of curvature
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Question 34
jamb2012
The magnification of an object 2cm tall when placed 10cm in front of a plane mirror is
A6.0
B1.0
C0.7
D0.6
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Question 35
jamb2012
A pinhole camera is placed 300m in front of a building so that the image is formed on a screen 5cm from the the pinhole. If the image is 2.5cm high, the height of the building will be
A25m
B50m
C100m
D150m
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Question 36
jamb2012
Where can a man place his face to get an enlarged image when using a concave mirror to shave?
ABetween the centre of curvature and the principal focus
BAt the principal focus
CBetween the principal focus and the pole
DAt the centre of curvature
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Question 37
jamb2012
The characteristic of a vibration that determines its intensity is the
AFrequency
BOvertone
CWavelength
DAmplitude
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Question 38
jamb2012
Which of the following factors will affect the velocity of sound?
AAn increase in the pitch of the sound
BAn increase in the loudness of the sound
CWind travelling in the same direction of the sound
DA change in the atmospheric pressure at constant temperature
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Question 39
jamb2012
The equation of a wave traveling in a horizontal direction is expressed as y = 15 sin \(\frac{2\pi}{5}\) (60t - x). What is its wavelength?
A60m
B15m
C5m
D2m
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Question 40
jamb2012
I. It is a rapid, constant and irregular motion of tiny particles. II. It gives evidence that tiny particles of matter called molecules exist. III. It takes place only in gases. IV. It gives evidence that molecules are in a constant state of random motion. which of the combinations above is correct about Brownian notion?
AI,II and III only
BII,III and IV only
CI,III and lV only
Dl, ll and lV only
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Question 41
jamb2012
The quantity of heat energy required to melt completely 1 kg of ice at - 30oC is
[latent heat of fusion = 3.5 x 10 5Jkg -1, specific heat capacity of ice = 2.1x10 3Jkg -1K -1]
A4.13x10 6J
B4.13x10 5J
C3.56x10 4J
D3.56x10 2J
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Question 42
jamb2012
Which of the following is NOT a factor that can increase the rate of evaporation of water in a lake?
Aincrease in the pressure of the atmosphere
Brise in temperature
Cincrease in the average speed of the molecules of water
Dincrease in the kinetic energy of the molecules of water
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Question 43
jamb2012
Calculate the temperature change when 500J of heat is supplied to 100g of water
[specific heat capacity of water = 4200JKg\(^{-1}\)k\(^{-1}\)]
A12.1oC
B2.1oC
C1.2oC
D0.1oC
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Question 44
jamb2012
2000cm3 of a gas is collected at 27oC and 700mmHg. What is the volume of the gas at standard temperature and pressure?
A1896.5cm3
B1767.3cm3
C1676.3cm3
D1456.5cm3
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Question 45
jamb2012
Two metals P and Q are heated through the same temperature difference. If the ratio of the linear expansivities of P to Q is 2:3 and the ratio of their
length is 3: 4 respectively, the ratio of the increase in lengths of P to Q is
A1:2
B2:1
C8:9
D9:8
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Question 46
jamb2012
Clinical thermometers are examples of
Apressure gas thermometer
Bresistance thermometer
Calcohol thermometer
Dmercury- in - glass thermometer
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Question 47
jamb2012
A balloon whose volume is 300m3 is filled with hydrogen. If the density of air is 1.3 kgm-3, find the upthrust on the balloon. [g = 10ms-2]
A3000N
B3800N
C3900N
D4200N
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Question 48
jamb2012
The pressure at any point in a liquid at rest depends only on the
Adepth and the density
Bmass and the volume
Cquantity and the surface area
Dsurface area and the viscosity
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Question 49
jamb2012
An object of volume 1 m 3 and mass 2kg is totally immersed in a liquid of density 1 kgm-3 . Calculate its apparent weight.
A20N
B10N
C2N
D1 N
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Question 50
jamb2012
If a load of 1 kg stretches a cord by 1.2cm, what is the force constant of the cord? {g=10ms-2}
