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Question 1 of 50
1. Question
The velocity of sound in air is independent of
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Question 2 of 50
2. Question
A body of mass 4kg is accelerated from rest by a steady farce of 9 N. What is its velocity when it has travelled a distance of 8 m?
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Question 3 of 50
3. Question
I. Directed towards a fixed point
II. Direct away from a fixed point
III. Directly proportional to its displacement from the fixed point
IV. Inversely proportional to its displacement from the fixed point
From the information above, a body performing simple harmonic motion is one whose acceleration is?
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Question 4 of 50
4. Question
Calculate the force between two planets of masses 3.0 x 1015 kg and 1.5 x 1020 kg if their centres are 8.0 x 1010m apart [G=6.67 x 10-11 Nm2kg-2)
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Question 5 of 50
5. Question
Calculate the minimum speed a body must have to escape from the moon’s gravitational field
[Mass of moon = 7.7 x 1022 kg, radius of moon = 1.7 x 106 m and G 6.7 x 10-11 Nm2kg2]
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Question 6 of 50
6. Question
A microphone converts sound energy to
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Question 7 of 50
7. Question
A body of mass 15kg falls from a height of 20m above the ground. What is the kinetic energy of the body just before it strikes the ground? [g=10mj]
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Question 8 of 50
8. Question
Which of the following is true of static and dynamic friction?
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Question 9 of 50
9. Question
A hydraulic press consists of two cylinders of cross- sectional area 0.3m2 and 6.0m2. If the piston in the smaller cylinder is pushed down with a force of 80N, what will be the force in the bigger cylinder?
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Question 10 of 50
10. Question
The efficiency of a machine can be improved by
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Question 11 of 50
11. Question
If a spring of length 20cm extends to 24cm when a mass of 16g is hung on it. By what length will it extend if a mass of 40g is hung on it?
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Question 12 of 50
12. Question
The point at which the molecules of a loaded wire begin to slide across each other resulting in rapid increase in extension is the
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Question 13 of 50
13. Question
A hydrometer reads 0.25 when dipped in kerosine and 0.12 in another liquid. Calculate the density of the liquid if the density of kerosine is 0.113 g
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Question 14 of 50
14. Question
A climber on top of a very high mountain needs a pressure pot to cook his food because
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Question 15 of 50
15. Question
Find the volume of a liquid that will have the same mass as 1 .8m of water [Density of water = 1000kgm = density of liquid 900kgm3]
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Question 16 of 50
16. Question
I. Increase in length
II. Increase in surface area
III. Increase in volume
IV. Increase in density
When a metal is heated, which of the statements above will
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Question 17 of 50
17. Question
The pressure of a gas in a closed container at 47°C is 1.6 x105 Pa. What will be the pressure of the gas at – 33°C?
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Question 18 of 50
18. Question
When a fixed mass of gas is kept in a sealed cylinder, the change in temperature is
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Question 19 of 50
19. Question
A heater rated 15A, 12V is used to boil completely 2 kg of liquid to its gaseous state at the same temperature in 10 mm. Calculate the specific latent heat of vaporization of the liquid
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Question 20 of 50
20. Question
The diagram above is a cooling curve for pure naphthalene. QR represents the period of
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Question 21 of 50
21. Question
The rise in the level of water in a capillary tube when dipped into a bowl of water is an illustration of
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Question 22 of 50
22. Question
The rate at which heat is transferred from one point to another in a material depends on its
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Question 23 of 50
23. Question
A hunter fired a gun and heard the echo from a cliff 2.4sec later. If the speed of sound in air is 320 ms-1 calculate the distance between the hunter and the cliff
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Question 24 of 50
24. Question
Soft materials are used to cover the walls of sound studios in order to reduce the effect of
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Question 25 of 50
25. Question
The diagram P and Q above represent sound waves of the same note. The difference between them is their
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Question 26 of 50
26. Question
A consequence of rectilinear propagation of light is
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Question 27 of 50
27. Question
The radius of curvature of a concave mirror is 18.0cm. If the image distance of an object placed before it is 36.0cm, calculate the linear magnification
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Question 28 of 50
28. Question
The angle of minimum deviation and the refractive angle of a triangular glass prism are 30° and 60° respectively. Calculate the refractive index of the prism
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Question 29 of 50
29. Question
During the dispersion of white light by a prism, the colour that is mostly deviated is
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Question 30 of 50
30. Question
When a plastic rod is rubbed with a dry piece of cloth, the rod and the piece of cloth will
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Question 31 of 50
31. Question
Calculate the effective capacitance between the Q in the circuit diagram above
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Question 32 of 50
32. Question
 In a circuit designed to convert a. c. current to pure d. c. current, the function of the capacitor is to
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Question 33 of 50
33. Question
The electrolyte in the Nicke-iron (NiFe) accumulator is
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Question 34 of 50
34. Question
Calculate the readings in the ammeter above neglecting the internal resistance
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Question 35 of 50
35. Question
Three identical cells each of e.m.f. 2V and negligible internal resistance are connected in parallel with a 4V resistor in a circuit. Find the current in the circuit
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Question 36 of 50
36. Question
What is the cost per kilowatt – hour of electricity if a man pays N360.00 for running 2 engines each rated 2500 W for 2 days?
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Question 37 of 50
37. Question
 Steel is good for the production, of permanent magnets because it
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Question 38 of 50
38. Question
The damping of the motion of a metal plate oscillating in a magnetic field demonstrates
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Question 39 of 50
39. Question
An induction coil is generally used to
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Question 40 of 50
40. Question
An inductor of 2H and negligible resistance is connected to a 12V mains supply 50/p. Find the current flowing in it
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Question 41 of 50
41. Question
In an electrolysis experiment, a current causes a deposit of 1.05g of copper on the cathode of the voltmeter in 30 minutes. Calculate the value of the current.
[e.c.e. of copper 3.33 x 10-7 kg C-1]
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Question 42 of 50
42. Question
When a magnetic field is applied transversely to the direction of radioactive emissions, the particles that are Mostly deflected are
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Question 43 of 50
43. Question
The fission of a certain radioactive nucleus is accompanied by the release of 6.5 x 1011 of energy. Calculate its mass defect
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Question 44 of 50
44. Question
Calculate the half – life of a radioactive element of decay constant 3.0 x 10-5 yr
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Question 45 of 50
45. Question
If mnX and pqY are isotopes, then it means that
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Question 46 of 50
46. Question
An n – type semiconductor has
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Question 47 of 50
47. Question
Which of the following materials has a forbidden gap?
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Question 48 of 50
48. Question
From the current – voltage graph of a junction diode above, which of the following statements can be inferred?
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Question 49 of 50
49. Question
An ideal rectifier has
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Question 50 of 50
50. Question
Thermal excitation is needed for electrical conductibility to start in
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