The magnification of the image of an object placed in front of a convex mirror is \(\frac{1}{3}\). If the radius of curvature of the mirror is 24cm, what is the distance between its object and its image?
A8cm
B16cm
C24cm
D32cm
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Question 32
jamb1989
Light of wavelength 5000 x 10-8cm travels in free space with a velocity of 3 x 108ms-1. What is its wavelength in glass of refractive index 1.5?
A3333 x 10-8cm
B5000 x 10-8cm
C6666 x10-8cm
D750010-8cm
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Question 33
jamb1989
In a sound wave in air, the adjacent rarefactions and compressions are separated by a distance of 17cm. If the velocity of the sound wave is 340ms-1. Determine the frequency
A10Hz
B20Hz
C1000Hz
D5780Hz
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Question 34
jamb1989
When the tension in a sonometer wire is doubled, the ratio of the new frequency to the initial frequency is?
A\(\frac{1}{\sqrt2}\)
B\(\frac{1}{2}\)
C\(\sqrt2\)
D2
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Question 35
jamb1989
A vibrator of frequency 60Hz is used in generating transverse stationary waves in a long thin wire, If the average distance between successive nodes on the wire is 45cm, find the speed of the transverse waves in the wire.
A27ms-1
B54ms-1
C90ms-1
D108ms-1
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Question 36
jamb1989
From the kinetic theory of gases, temperature is a
Aform of energy and is proportional to the total kinetic energy of the molecules
Bform of energy and is proportional to the average kinetic energy of the molecules
Cphysical property and is proportional to the total kinetic energy of the molecules
Dphysical property and is proportional to the average kinetic energy of the molecules
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Question 37
jamb1989
An electric heater is used to melt a block of ice of mass 1.5kg. If the heater is powered by a 12V battery and a current of 20A flows through the coil, calculate the time taken to melt the block of ice at 0oC. [specific latent heat of fusion of ice = 336 x 103Jkg-1]
A76.0min
B35.0min
C21.0min
D2.9min
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Question 38
jamb1989
A mass of gas at 7oC and 70cm of mercury has a volume of 1200cm3. Determine its volume at 27oC and pressure of 75cm of mercury.
A1200cm3
B1378cm3
C4320cm3
D4629cm3
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Question 39
jamb1989
A column of air 10.0cm long is trapped in a tube at 27oC. What is the length of the volume at 100oC?
A12.4cm
B13.7cm
C18.5cm
D37.0cm
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Question 40
jamb1989
The pressure on the gas of constant gas thermometer at the ice point is 325mm of mercury and at the steam point is 875mm of mercury. Find the temperature when the pressure of the gas is 190mm of mercury
A30k
B243k
C300k
D3003k
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Question 41
jamb1989
A piece of wood of mass 40g and uniform cross-sectional area of 2cm2 floats upright in water. The length of the wood immersed is
A30cm
B40cm
C20cm
D2cm
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Question 42
jamb1989
Which of the following devices are used to measure pressure? i. Aneroid barometer. ii. hydrometer. iii. hygrometer. iv. manometer.
Ai and iii
Bii and iii
Ciii and iv
Di and iv
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Question 43
jamb1989
A block-and-tackle system is used to lift a load of 20N through a vertical height of 10m. if the efficiency of the system is 40%, how much work is done against friction?
A80J
B120J
C300J
D500J
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Question 44
jamb1989
A thin film of liquid is trapped between two glass plates. The force required to pull the plates apart will increase if the
Asurface tension of the liquid is reduced
Bperpendicular distance between the plates is increased
Carea of the liquid surface in contact with the plates is increased
Dpressure of the air is decreased
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Question 45
jamb1989
Two points on a velocity time-graph have coordinates (5s, 10ms-1) and (20s, 20ms-1). Calculate the mean acceleration between the two points
A0.67ms-1
B0.83ms-1
C1.50ms-1
D2.00ms-1
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Question 46
jamb1989
The magnitude of the resultant of two mutually perpendicular forces, F1 and F2 is 13N, if the magnitude of F1 is 5N, what is the magnitude of F2?
