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 12
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 13
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 14
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 15
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 16
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 17
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 18
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 19
jamb2012
Clinical thermometers are examples of
Apressure gas thermometer
Bresistance thermometer
Calcohol thermometer
Dmercury- in - glass thermometer
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Question 20
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 21
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 22
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 23
jamb2012
If a load of 1 kg stretches a cord by 1.2cm, what is the force constant of the cord? {g=10ms-2}
A866Nm-1
B833Nm-1
C769Nm-1
D667Nm-1
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Question 24
jamb2012
A block and tackle is used to raise a load of 250N through a vertical distance of 30m. What is the efficiency of the system if the work done against friction is 1500J?
A62.5%
B73.3%
C83.3%
D94.3%
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Question 25
jamb2012
An object of mass 20kg slides down an inclined plane at an angle of 30o to the horizontal. The coefficient of static friction is?
[g = 10ms-2]
A0.2
B0.3
C0.5
D0.6
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Question 26
jamb2012
An object moves in a circular path of radius 0.5m with a speed of 1ms-1 What is its angular velocity?
A8 rads-1
B4 rads-1
C2 rads-1
D1 rads-1
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Question 27
jamb2012
If a freely suspended object is pulled to one side and released, it oscillates about the point of suspension because the
Aacceleration is directly proportional to the displacement
Bmotion is directed away from the equilibrium point
Cacceleration is directly proportional to the square of the displacement
Dvelocity is minimum at the equilibrium ponit
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Question 28
jamb2012
A rocket is fired from the earth's surface to a distant planet. By Newton's law of universal gravitation, the force F will
Aincrease as r reduces
Bincrease as G varies
Cremains constant
Dincreases as r increases
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Question 29
jamb2012
A car starts from rest and moves with a uniform acceleration of 30ms-2 for 20s. Calculate the distance covered at the end of the motion
A6km
B12km
C18km
D24km
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Question 30
jamb2012
Calculate the total distance covered by a train before coming to rest if its initial speed is 30ms-1 with a constant retardation of 0.1m-2
