Your results on Physics 2012 are shown below

1. The derived unit of pressure can be expressed as

• kgms-2
• Kgm-1 s– 2
• Kgm-2 s-2
• Kgm-1s2

2.

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The diagram above illustrate trapped air in a syringe placed in water that is gradually heated . it is observed that the piston rises as the temperature of water rises. Which of the following statements explain this observation?

• Frequency of collision of trapped air molecules with the walls of the syringe is more
• Molecules of trapped air expand more
• Number of molecules of trapped air increases
• Speed of trapped air molecules decreases

3. A block of wood of density 0.6gcm3, weighing 3.06 N in air, floats freely in aliquid of density 0.9 gcm-3 Calculate the volume of the portion immersed. (g = 10 ms-2)

• 340 cm3
• 254 cm3
• 170cm3.
• 510 cm2

4. SA metal ball of weight W falls through a column of glycerine of viscosity V. if the ball expirences an upthrust U and terminal velocity is Attained then

• w> U+ V
• W = U+ V.
• W = U – V.
• W< U + V.

5. Which of the following substances is the most volatile at the room temperature?

• Water
• Diesel
• Petrol
• Kerosene.

6. The movement of fluid up or down a narrow tube is

• Osomosis
• Brownian motion
• Capillarity.
• Diffusion.

7. A bird flies at 10 ms -1 for 3s, 15 ms-1 for 3s and 20 ms-1 for 4 s Calculate the birds average speed.

• 4.5 ms-1
• 15.0ms-1
• 15.5 ms-1
• 51.7 ms-1.

8. Which of the following velocity-time graphs does not represent an accelerated motion?

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•  
•  
•  

9. The Time of flight for a projectile motion is given by the expression

• U sinǾ/g
• U sinǾ/2g
• 2u sinǾ/g
• U sin2Ǿ/g

10. An object is dropped from the top of tower, if it takes 4 s for it to reach the ground, Calculate the height of the tower. ( g = 10 ms-2, ignor air resistance)

• 20m
• 40M
• 80M
• 160M

11. When a body is slightly rasied. What is the state equilibrium of the body?

• Unstable
• Stable
• Netural
• Cannot be determined.

12. A simple pendulum makes 50 oscillation in one minute Determine its period of oscillation.

• 0.04s
• 0.83s
• 1.20s
• 50.00s.

13. 1The tendency for a stationary body to continue to remain at rest when a force is applied to it is know as

• Friction
• Impilse.
• Inertia.
• Momentum.

14. A resulatant force of magnitude 15 N acts on a body of mass 250g Calculate the magnitude of the acceleration.

• 0.06ms-2
• 3.75 ms-2
• 16.67ms-2
• 60.00ms-2.

15. 1A girl stands on a scale in a lift. If the reading on the scale is less than her weight, then the lift is moving

• Upward at uniform speed.
• upward with uniform speed.
• Downward with uniform speed
• Downward with uniform speed acceleration

16. The S.I Unit of heat is

• Joule
• Kelvin
• Watt
• Ampere.

17. A body is plled through a distance of 500 m by a force of 20 N. if the power developed is 0.4KW, calculate the time of which force acts.

• 250.0 s
• 25.05
• 2.5 s
• 0.5s.

18. A metal sheet of area 100 c2 was heated through 70o C Calcualte its new area if the linear expansivity of the metal is 0.000017 k -1

• 100.06cm2
• 100.12 cm2
• 100.24cm2
• 100.36 cm2

19. The Thermopile is a device for detecting

• Radioactive radiation
• Radiant energy
• X- ray
• The presence of electron

20. In the formation of sea breeze, wind blow from

• Sky land
• Sea to sky
• Land to sea
• Sea to land

21. A piece of copper of mass 20g at a temperature of 110oC was dropped into a mixture of ice and water at O0C. If the final steady temperature of the mixture is 0oC calculate the amount of ice that melted (Specific heat capacity of copper =O.4jg-1k-1,Specific latent heat of fusion of ice =330jg-1)

• o.37g
• o.60g
• 2.40g
• 2.70g

22. Which of the following factors decreases the rate of evaporation of a liquid

• Increase in pressure over the liquid
• Lowering the boiling point
• Decrease in humility
• Wind

23. When two waves are superimposed on each other , the following occurrences are possible, expect

• Nodal lines
• Anti nodal lines
• Stationary waves
• Dispersion

24. Which of the properties of waves?

• Reflection
• Interference
• Diffraction
• Polarization

25. An object of height 2.5cm is placed 20cm from a convex mirror of focal length 10cm. calculate the height of its image

• 2.5cm
• 3.0cm
• 5.0cm
• 25.0cm

26. A ray of light passes from air to water to glass to air . Given that the refractive index for light passing from air to water is 4/3 and air to glass is 3/2 , calculate the refractive Index of glass relative to water

• 0.50
• 0.67
• 0.75
• 1.13

27. An object is place at a point x between the focal point f and the optical center c of a diverging lensif f is the focal point on the side of the lens the image of the object is formed between

• F and x
• X and c
• C and f
• F and 2f

28. And object is placed 10cm from a converging lens of focal length 15cm calculate the magnificationof the image formed

• 3.0
• 1.5
• 0.6
• 0.3

29. A telescope is said to be in normal adjustment when the

• Focal length of object is greater
• Focal length of the eyepiece is greater than that bof the objective
• Focal length of the eyepiece is equal to that of the objectives
• Objectives focal point coincdides with that of the eyepiece

30. The sound heard by na person after the reflection of the sound generate by him is called

• Reverberation
• Resonance
• Echo
• Audibility

31. Which of the following set of coloured light is /are secondry colours I red blue and green IIblue cyan and magenta iii GREEN MAGENTA AND YELLOW iv yellow cyan and magenta

• I and II only
• I and iii only
• IV only
• I,IIAnd IV only

32. Which of the following diagrams correctly illustrates the the vibration of air colums for second harmonics in an open pipe

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•  
•  
•  

33. When two likes charges are brought together the pontential energy of the system formed will

• Increase because work is done against the filed
• Increase because work is done by the filed
• Decrese because work is done by the filed
• Derease beause work is done by the filed

34. Two capacitor each of capacitance 2uF are connected in paarelle if the p.d across them is 120 V,

• 6.0×10-5C
• 1.2x 10-4C
• 2.4X 10-4C
• 4.8X10-4C

35. Which of the following properties is an advantage of a lead Acid accmulator over an alkaline accumulator

• Possesses low internal resitance
• Can be recharged
• Has short resistance
• Possesses Higher emf

36. Six dry cells each of emf 2.0 and internal resistance of 1.0 are connected in paralle acrose a load of 3.0 calculate the in prarlle

• 0.63a
• 0.50a
• 0.31a
• 0.22a

37. Two similar cells are used to light two similar lamps as illustrates in the diagrams above in which of the circuit diagram are the laps brightest

• P
• Q
• R
• S

38. A 12 resistors dissipates 8kj of heat in 20 s calculate the current throught the resistor

• 5.8a
• 6.9a
• 30.oa
• 33.3a

39. A bar magnet is broken into two pices. Which of the following diagrams correctly illustrates the polarities of the pieces?

•  
•  
•  
•  

40. The magnetic relay is a device used for

Timing in sport

• Storing magnetic field .
• Reading the magnitude of the magnetic flux.
• Controlling another circuit carring larger current.

41. The core of a tranfomer is usually laminated in order to

• Reduce magnetic flux leakage.
• Reduce eddy current
• Prevent vibration of the trasfomer
• Make magnetic reversal in the core much easier.

42. Which of the following modes is the most economical method of transmitting electrical power over along distance?

• Altemating current at low voltage and high current
• Alternating current at high voltage and high current
• Alternating current at high voltage and low current
• Direct current at low voltage and high current.

43. An indicator is connected to a 24 V, 50 Hz mains supply if the current through the inducator is 1.5 A, calculate the inductance of the inducator.

• 8.0×102 H
• 7×10 o h
• 1.6 x 10o H
• 5.1x 10 -2 H (π=22)

44. In a R – C circuit

• I rms leads V rms by 60 degree
• I rms slags V rms by 60 degree
• V rms slags I rms by 90 degree
• V rms leads I rms by 90 degree.

45. In atom in an excited satte is one whose

• potential energy is minimum
• Potential energy is maximum.
• Electrons are in the conduction band
• Electrons have moved to higher energy level.

46. A metal with a work function of 3.0eV is irradiated with ultraviolet light of energy 4.0eV The kinetic energy of the ejected electron is

• 1.0eV
• 3.0eV
• 4.0 V
• 7.0eV.

47. Which of the following statements about X –rays is correct? X-rays

• Are produced when a metal is surface is irradiated with ultraviolet light
• Are produced when a metal target is used to block fast moving electrons
• Have long wavelengths and are therefore very penetrating
• Are not part of the electromagnetic spectrum.

48. Which of the following arrangements of radiations is in the order decreasing penetrating power

• x, B Y
• X, Y, B
• B,Y, X
• Y, B

49. Which of the following radiations emitted is radioactive decay has momentum, a fairly hig penetrating power and is deflected by a magnet

• Alpha partical
• Beta particale
• Gamm radiation
• x- radiation

50. Which of the following devices is used to determine the relative density?

• Manometer
• Hydrometer
• Hypsometer
• Hygrometer

ANSWERS

1. B
2. B
3. A
4. B
5. C
6. C
7. –
8. A
9. C
10. C
11. B
12. C
13. C
14. D
15. D
16. A
17. B
18. C
19. B
20. D
21. D
22. A
23. D
24. D
25. A
26. A
27. B
28. A
29. –
30. C
31. C
32. A
33. D
34. C
35. D
36. A
37. A
38. A
39. –
40. D
41. B
42. C
43. D
44. C
45. D
46. A
47. B
48. B
49. B
50. D