1. Figure1 show forces of 15N and 3N acting on amass M.
If the frictional force on the ground is 6N, find the resultant force on M
A. 6 N
B. 12 N
C. 18 N
D. 24 N.
2. Which one of the following pairs of colors combine to from white light?
A. Green + yellow
B. Red + magenta
C. Blue + yellow
D. Blue + cyan
3. A bulb dropped vertically downwards hits the ground with a speed of 40ms-1.Find the height through which the bulb falls.
A. 2.0 m
B. 4.0 m
C. 80.0 m
D. 400.0 m
4. Two resistors of 4Ω and are connected in series with a series with a battery of e.m.f 20 V and negligible internal resistance. Calculate the current that flows through the 4 Ω resistor.
A. 0.80 A
B. 1.25 A
C. 5.00 A
D. 6.67 A.
5. Which of the following is/are correct about the properties of charges?
(i) Like charges repel and unlike charges attract
(ii) Electric field lines moving from same charges cross each other.
(iii) electric field lines moving from positive charges to the negative charges
A. (i) only
B. (iii) only
C. (i) and(iii) only
D. (i) and (ii)only
6. Which of the following factors enable(s) a small effort to lift a large load in hydraulic press?
(i) Pressure is transmitted equally in all directions
(ii) Small piston produces high pressure.
(iii) The load experiences a large force.
A. (i) only
B. (i) and (ii)only
C. (i) and(iii) only
D. (i), (ii) and (iii).
7. A ray of light travelling from air to form water is refracted at an angle of the angle of incidence, if the critical angle of water 30o. Find is 48.6o.
A. 22.10
B. 40.60
C. 41.70
D. 60.00
8. The amount of space occupied by an object is its
A. Mass
B. Weight
C. Volume
D. Density
9. The source of geothermal energy is
A. sun
B. Earth
C. Moon
D. Water
10. Which one of the following electromagnetic waves is used to detect forged bank notes?
A. Visible light.
B. Ultra violet
C. infrared
D. X-rays
11. The phenomenon upon which the optical fiber works is
A. Refraction of light
B. Reflection of light
C. Diffraction of light
D. Total internal reflection
12. The process by which electrons are emitted from a metal surface when struck by ultra-violet light is
A. Thermionic emission
B. Photoelectric effect
C. Radioactivity
D. Reflection.
13. A. Smoke cell is used to demonstrate phenomenon called
A. diffusion
B. Brownian motion.
C. capillarity
D. Surface tension.
14. Which of the following quintiles increase when the mass of a body is increased?
A. Velocity
B. Acceleration.
C. Displacement.
D. Momentum.
15. In a simple cell, the conventional flow of current is
A. From the positive to the negative terminal of the cell.
B. From the negative to the positive terminal of the cell
C. Due to polarization
D. Due local action.
16. The temperature of an electric appliance can be regulated by a
A. thermocouple
B. Thermometer.
C. Thermoster.
D. Thermopile.
17. When an a.c is applied to the y-plates of a C.R.O and the time base is switched off ,the peak voltage of the a.c is proportional to the
A. Length of the horizontal line on the screen.
B. Length of the vertical line on the screen.
C. Height of the a.c wave from displayed.
D. Wavelength of a.c wave from displayed.
18. Figure 2 shows a U – tube containing mercury, a column of water of density 1000kgm-3 and a column of paraffin of density 800kgm-3. Find the length of the water column if the length of the paraffin column is 15cm.
A. 12.00 cm
B. 18.75 cm
C. 1.25 cm
D. 0.80 cm
19. The lower part of the second floor of a stored building is made of reinforced concrete while the upper part is not because
(i) The lower part is subjected to tensional forces while the upper part is subjected to compressional forces.
(ii) Non reinforced concrete can withstand large tensional forces.
(iii) Reinforced concrete can withstand large tensional forces.
A. (i) only
B. (ii) only
C. (i)and (ii) only
D. (i) and (iii) only
20. Which of the following are deduced from the simple nuclear model of the atom?
(i) There are neutrons inside the nucleus.
(ii) Electrons are embedded in the nuclei.
(iii) The sign of the charge of the nuclei is the same as that of alpha particles.
A. (i) and (iii) only
B. (i) and (ii) only
C. (ii)and (iii)
D. (i), (ii) and (iii).
21. A bottle has a mass of 1.3kg when filled with oil and amass of 0.9 kg when half filled with the same oil. If the volume of the bottle is 500cm3, find the density of the oil in gcm-3
A. 0.80.
B. 1.60.
C. 1.80.
D. 2.60.
22. A transformer having a primary coil of 400 turns and a secondary coil of 200 turns is connected to a 240 V a.c mains supply. Find the secondary voltage
A. 480 V
B. 333 V
C. 120 V
D. 33.3 V
23. The frequency of a note produced on a string decreased when the
(i) Tension in the string is decreased
(ii) Length of the string is increased
(iii) Thickness of the string is increased
A. (i) and (ii) only
B. (ii)and(iii) only
C. (i) and (iii) only
D. (i),(ii) and (iii).
24. An electric bulb rated 60 W is connected to the power supply .If a current of 0.25 A flows through the bulb when it is operating, find the resistance of its filament.
A. 3.75 Ω
B. 15.00 Ω
C. 240.00 Ω
D. 960.00 Ω
25. Figure 3 shows a freely suspended with pole Q pointing south..
If pole X of another magnet attracts, P, which of the following is true about the polarities of X and Q?
X is a north pole and Q is a south pole.
X is a south pole and Q is North Pole.
Both X and Q are south poles
Both X and Q are north poles.
26. The cost of running a lamp rated 7.2 V, 3.0 A for 5 hours is shs2.16. Find the cost per unit of electricity.
27.Figure 4 shows water in a rectangular pipe
Where a heater should be placed for the water currents to move in the direction shown?
A. P.
B. Q.
C. R.
D. S
28. Which of the following is /are true about surface tension of a liquid?
(i) It is constant at a given temperature.
(ii) It changes with the pressure above the liquid.
(iii) It is not affected by the amount of dissolved substances in the liquid
A. (i) only
B. (i) and (ii) only
C. (i) and (iii) only.
D. (ii) and (iii) only
29. A person of mass 20 kg develops a power of 20 W on climbing steps in 120 s .if each step is 0.2 m high, find the number of steps.
30. Which one of the following is a correct difference between diffraction and refraction?
|
|
Diffraction |
Refractions |
| A |
speed of wave changes |
Speed of the waves is constant. |
| B |
The wave spreads |
The wave change direction. |
| C |
Frequency remains constant |
Frequency changes. |
|
D. |
Takes place with parallel waves. |
Takes place with both parallel and circular waves. |
31. A person stands 5 m away from a plane mirror find the distance that the person must move in order to be 2 m away from the image in the mirror.
A. 1 m
B. 3 m
C. 4 m
D. 7 m.
32. Figure 5 shows identical rods PR and QS in a solenoid.
When switch K is closed, the rod separate from other. Which one of the following statements is correct about the polarities of ends P, Q, R and S?
A. P and Q are north, R and S are south.
B. P and Q are south ,R and S are north
C. P and S are north, Q and R are south
D. P and S are south, Q and R are north.
33. Amass of 600 g produces an extension of 15 cm in a spring find the extension produced in the spring by a force of 12.0 N.
A. 4.8 cm
B. 17.5 cm
C. 10.8 cm
D. 30.0 cm
34. The energy changes that take place when a stone is fired using a catapult and hits glass are
A. Kinetic →heat +sound→ elastic potential energy
B. kinetic → elastic potential energy → Heat + Sound energy
C. Elastic potential energy → Sound+ heat →Kinetic energy
D. Elastic potential energy →kinetic energy →Heat – sound energy
35. Figure 6 shows placed near an electromagnet with poles P and Q
Which of the following is /are observed when current flows through the coil?
(i). the magnet is attracted towards P and Q
(ii) the magnet is repelled away from P and Q
(iii)The magnet rotates about its axis .
A. (i) only
B. (i) and (ii) only
C. (ii) and(iii) only.
D. (i) and (iii) only
36. A sample of a radioactive substance has a mass of 40 g. if 35 g of a sample decays in 12 hours, find half life.
A. 2.4 h
B. 3.0 h
C. 3.3 h
D. 4.0 h
37. A person fires a gun and hears the echo of the gunshot reflected from a well after 0.4s. If the wall is 64m away from the person, find the velocity of sound in air.
A. 320ms-1
B. 160ms-1
C. 80ms-1
D. 25.6ms-1
38. The volume of affixed mass of gas at a temperature of 570 C is 750cm3. Find the volume of the gas when its temperature is 90C at constant pressure.
A. 118.4 cm3
B. 124.1cm3
C. 640.9 cm3
D. 877.7 cm3.
39. Which of the following increase the stability of a body?
(i) Raising its center of gravity
(ii) Lowering its center of gravity.
(iii) Making its base narrow.
(iv) Making its base wide.
A. (i) and (iv) only
B. (ii) and (iv) only
C. (i) and (iii) only
D. (ii) and (iii) only.
40. Figure 7.shows dots made on a ticker tape by a ticker timer which vibrates at a frequency of 40Hz.
Find the time taken to make the dots
A. 5.00 s
B. 4.44 s.
C. 0.23 s.
D. 0.20 s.
41. (a) state Hooke’s law
(b)
Figure 8 shows how a stretching force varies with extension produced in a ductile material.
(i) What is meant by a ductile material?
(ii) Identify points A and C on the graph
(iii) Describe the behavior of the material at C
42. Isotopes of the radioactive element Uranium occur naturally in small proportion in some rocks. The table below gives information about one isotope of Uranium
|
Mass number |
238 |
|
Atomic number |
92 |
|
Radiation emitted |
Alpha particle |
(a) (i) How many neutrons are there in an atom of this Uranium isotope?
(ii) What is the total number charged particles in a single atom of uranium 238?
(iii)Write a nuclear equation for these uranium isotopes emitting an alpha particle.
43. (a) What is meant by the term principle focus of a diverging lens?
(b) (i) What is meant by short-sightedness?
(ii) Draw a ray diagram to show how the defect in (b) (i) above may be corrected by a suitable type of lens
44. (a) State the law of electrostatics
(b). A small metal sphere carrying a positive charge is lowered gently into a metallic can placed on the cap of an uncharge gold –leaf electroscope as shown in figure 9.
(i) State what happened to the leaf of the electroscope
(ii) Explain the observation in (b) (i) above.
45. (a) State one application of Archimedes’ principle.
(b) A piece of iron weights 175 g in air and 153 g in water. Find the density of the iron.
46. (a) What is a stationary wave?
(b) What is meant by nodes as applied to a stationary wave?
(c) The distance between four successive nodes on a stationary wave is 12 cm. Find the length of the wave.
47. (a) What is meant by the coulomb?
(b) A charge of 40 C flows through an ammeter in 20 s. What is the reading of the ammeter?
(c ) Three cells ,each of 1.5 V and internal resistance 1 Ω are to be arranged in different ways. Draw a diagram to show how the cells can be arranged to deliver the least current.
48. (a) State Pascal’s principle.
(b) Figure 10 shows a concrete block of mass 10 kg that measures 0.1 m x 0.2 m x 0.4 m
Find
(i) Minimum pressure it exerts.
(ii) Maximum pressure it exerts
49. (a) Define momentum.
(b) A. car X of mass 1000 kg travelling at a speed of 20 ms-1 in the direction due east collides head –on with another car Y of mass 1500 kg ,travelling at 15 ms-1 in a direction due west. If the two cars stick together, find their common velocity after collision.
50. (a) (i) In an experiment to estimate the thickness of an oil molecule, the diameter of an oil drop is given to be 0.5 mm and the diameter of the circular patch of the same drop on a water surface is 13 cm.
Calculate the thickness of the oil molecule.
(ii) State the assumption made.