The physical properties of sound waves can best be described by
Areflection and diffraction
Bpolarization and reflection
Cpolarization and diffraction
Dpolarization and refraction
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Question 42
jamb1998
One valid assumption of the kinetic theory of gasses is the
Athe molecules of a gas are constantly in a state of motion and the number of collision remains constant
Bthe number of molecule of gas increases with increasing pressure
Cas the temperature increases, the number of collision made by the gas molecule remains constant
Dthe molecules of gas are all identical and are very small in size
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Question 43
jamb1998
A vapour is said to be saturated when
Amore molecules return to the liquid than the amount that left it
Ba dynamic equilibrium exists between the molecules of the liquid and the vapour molecules at a given temperature
Cthe vapour pressure is equal to the atmospheric pressure
Dall molecules are moving with the same speed in all directions at a given temperature
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Question 44
jamb1998
How many grams of water at 17oC must be added to 42g of ice at 0oC to melt the ice completely? [specific latent heat of fusion of ice = 3.4 x 105Jkg-1, specific heat capacity of water = 4200Jkg-1k-1]
A200g
B300g
C320g
D400g
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Question 45
jamb1998
A 500W heater is used to heat 0.6kg of water from 25ºC to 100ºC in t\(_1\) seconds. If another 1000W heater is used to heat 0.2kg of water from 10ºC to 100ºC in t\(_2\), seconds, find \(\frac{t_1}{t_2}\)
A50
B5
C5/4
D1/5
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Question 46
jamb1998
A gas has a volume of 100cm3 at 27oC. If it is heated to temperature T until a final volume of 120cm3 is attained, calculate T
A33oC
B60oC
C87oC
D114oC
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Question 47
jamb1998
The linear expansivity of brass is 2 x 10-5C-1. If the volume of a piece of brass is 15.00cm3 at 00C, What is the volume at 100oC?
A16.03cm3
B16.00cm3
C15.09cm3
D15cm3
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Question 48
jamb1998
A platinum resistance thermometer records 3.0\(\Omega\) at 0oC and 8.0\(\Omega\) at 100oC. If it records 6.0\(\Omega\) in a certain environment, The temperature of the medium is
A80oC
B60oC
C50oC
D30oC
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Question 49
jamb1998
A solid of weight 0.600N is totally immersed in oil and water respectively. If the upthrust of oil is 0.210N and the relative density of oil is 0.875. Find the upthrust in water.
A0.600N
B0.360N
C0.240N
D0.180N
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Question 50
jamb1998
The atmospheric pressure due to water is 1.3 x 106Nm-2. What is the total pressure at the bottom of an ocean 10m deep? [Density of water = 1000kgm-3, g = 10ms-2]
A1.3 x 107Nm-2
B1.4 x 106Nm-2
C1.4 x 105Nm-2
D1.0 x 10 5Nm-2
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Question 51
jamb1998
Which of these statements are correct for the pressures in liquids? i. pressure in a liquid at a point acts equally in all directions. ii. pressure increases with depth. iii. pressure at a depth depends on the shape of the container. iv. pressure at the same depth in different liquids are proportional to the density at different liquids.
Ai, ii, iii only
Bi, ii, iv only
Ci, iii, iv only
Dii, iii, iv only
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Question 52
jamb1998
The tendon in a man's leg is 0.01m long. If a force of 5N stretches the tendon by 2.0 x 10-5m, calculate the strain on the muscle.
A5 x 106
B5 x 102
C2 x 10-3
D2 x 10-7
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Question 53
jamb1998
In a wheel and axle mechanism the diameters of the wheel and axle are 40cm and 8cm respectively. Given that the machine is 80% efficient, what effort is required to lift a load of 100N?
A20N
B25N
C50N
D80N
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Question 54
jamb1998
A parachute attains a terminal velocity when
Aits density is equal to the density of air
Bthe viscous force of the air and the upthrust completely counteract its weight
Cit expands as a result of reduced external pressure
Dthe viscous force of the air is equal to the sum of the weight and upthrust
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Question 55
jamb1998
A man whose mass is 80kg climbs a staircase in 20s and expends power of 120W. Find the height of the staircase.[g = 10ms-2]
A1.8m
B2.0m
C2.5m
D3.0m
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Question 56
jamb1998
A uniform meter rule weighing 0.5N is to be pivoted on a knife-edge at the 30cm-mark. where will a force of 2N be placed from the pivot to balance the meter rule?
A95cm
B25cm
C20cm
D5cm
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Question 57
jamb1998
The force of attraction between two point masses is 10-4N when the distance between them is 0.18m. If the distance is reduced to 0.06m, calculate the force.
A1.1 x 10-5N
B3.3 x 10-5N
C3.0 x 10-4N
D9.0 x 10-4N
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Question 58
jamb1998
A ball of mass 0.15kg is kicked against a rigid vertical wall with a horizontal velocity of 50ms-1. If it rebounced with a horizontal velocity of 30ms-1, Calculate the impulse of the ball on the ball · ·
A3.0Ns
B4.5Ns
C7.5Ns
D12.0Ns
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Question 59
jamb1998
In free fall, a body of mass 1kg drops from a height of 125m from rest in 5s. How long will it take another body of mass 2kg to fall from rest from the same height? [g = 10ms-1·]
A5s
B10s
C12s
D15s
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Question 60
jamb1998
A ball is moving at 18ms\(^{-1}\) in a direction inclined at 60º to the horizontal. The horizontal component to its velocity is
