1. Which of the following electromagnetic waves has the highest penetrating power?
A. Gamma rays
B. Ultraviolet
C. Infrared.
D. Microwaves.
2. Which of the following is a derived unit?
A. Newton.
B. Kilogram.
C. Meter.
D. Second.
3. Which of the following is the S.I unit of specific latent heat of fusion?
A. JK-1
B. Jkg-1
C. Jkg-1K-1
D. Js-1
4. Which of the following forms of energy is conserved in biogas?
A. chemical energy
B. Potential energy
C. Kinetic energy
D. Heat energy
5. Which of the following optical devices can be used as a solar concentrator?
A. concave mirror
B. convex mirror
C. Concave less.
D. Glass prism.
6. The deflection of cathode rays by an electric field is due to the
A. Voltage applied between electrons
B. Energy of the electrons
C. Speed of electrons
D. Charge on the electrons
7. The force which holds the molecules of water together is called
A. Gravity
B. Adhesion
C. Cohesion
D. Electrostatic
8. Which of the following is the correct about current that flows through resistors connected in series?
A. Current increases as it flows through the resistors.
B. Current decreases it flows through the resistors.
C. Current through each of the resistors is proportional.
D. current through each of the resistors is the same
9. when no external forces act on two bodies in a collision, the total momentum of the bodies
A. Increases.
B. Decreases.
C. Remains constant.
D. Is proportional to product of their masses.
10. A negatively charged pointed conductor mounted on an insulated stand loses charge in air because
A. Negatively charged ions are attracted to it.
B. Negatively charged ions repelled by it.
C. Positively charged ions are repelled by it.
D. Positively charged ions are attracted to it.
11. An aircraft is able to experience a lift in air because
(i). It can adjust the shape of the wings to create less pressure above the wings.
(ii). It can adjust the shape of its wings to create less pressure below the wings.
(iii). It can adjust the shape of its wings to reduce its apparent weight in air.
A. (i) only
B. (ii)only
C. (i) and (iii) only.
D. (ii) and (iii) only.
12. An atom becomes positively charged when it loses an electron because
A. An atom has equal number of protons and electrons
B. The nucleus contains neutrons and protons
C. Electrons are negatively charged.
D. There will be more positively charge than negatively charge.
13. Abeam of yellow light is incident on the filter as shown in figure 1.
Which color of light will be seen on the screen?
A. Yellow.
B. Green.
C. Blue.
D. Red.
14. Which of the following statements is correct about a wire stretched to be yield point
A. Its extension is proportional to the applied load.
B. It will have undergoes both elastic and plastic deformation.
C. A large force produces both small extensions.
D. It breaks at yield point.
15. Figure 2 show a simple circuit breaker
The purpose of the coil is to
A. produce heat energy
B. Stop the flow of current.
C. Create a magnetic field.
D. Increase the amount of current
16. Which of the following is true about constructive interference in waves
i) Crest of one wave falls on the trough of another wave.
ii) Coherent waves of same amplitude and frequency are super imposed on one another
iii) The wave must be travelling in the same direction.
A. (i) Only.
B. (ii) Only.
C. (i) and iii) only.
D. (ii) and (iii) only.
17.The energy change that takes place when a hot metal releases an electron
A.Heat energy → potential energy.
B.Potential energy → kinetic energy.
C.Heat energy → kinetic energy.
D.Heat energy → electrical energy.
18.Which one of the following statement is correct about diffusion?
A.It takes place at the same rate in all the state of matter.
B. It is faster in gases than in liquids.
C.It is faster in liquids than in gases.
D. It does not depend on temperature.
19.Thermionic emission occurs.
(i) In all metals.
(ii) When electrons gain enough thermal energy.
(iii) When accelerating voltage is applied at the anode.
A. (i) Only.
B. (ii) Only.
C. (ii) and (iii)only.
D. (i) and (iii) only.
20. When current is passed through aware placed perpendicular to a magnetic field, the wire.
A. Becomes magnetized.
B.Become demagnetized.
C. Produces a neutral point below it.
D. Experiences a force.
21. S is a mode of heat transfer in glass but not vacuum and T is a mode of heat transfer in vacuum, identify S and T
S T
A. Convection Conduction
B. Conduction Radiation.
C. Radiation Convection.
D. Convection Radiation.
22. Which of the following is correct about resonance in tubes?
(i) It occurs at different length of air columns.
(ii). The frequency of the vibrating air is the same as that of the body producing it
(iii) The velocity of sound varies each time resonance occurs in the same tube.
A. (i) Only.
B. (i) and (ii) only
C. (ii)and(iii)only
D. (i),(ii) and (iii).
23. Which one of the following is asset of machines that depends on running effects of forces or their operation?
A. The lever gears and wedges.
B. Hydraulic press, wheelbarrow and spanners.
C. Spanners pulleys and wedges
D. The lever, spanners and hammers.
24. Which of the following minimize leakages of the magnetic flux in transformer?
(i). laminating the iron core.
(ii). Winding the wires on soft iron.
(iii) Reducing air between the coils.
A. (i) and (ii)only
B. (ii) and (iii) only
C. (i) and (iii) only
D. (i) Only.
25. The equation above representative decay of radioisotope by beta emission .find the value of x
A. 90
B. 92
C. 143
D. 144
26. Which one of the following statements is true about the self induced e.m.f of a coil?
A. It acts to increase the e.m.f if the current through the coil is increasing.
B. It acts to decrease the e.m.f if the current through the coil is increasing
C. It is always in the same direction as the current.
D. It depends on the rate of change of current
27. The time that elapses between the lightning flash and thunder is 5 s, find the distance of the cloud from the observer. (speed of sound in air is 330 ms-1 )
A. 66 m.
B. 1650 m.
C. 132 m.
D. 3300 m.
28. Figure 3 shows four forces of 1 N, 2 N, and 3 N acting on practical X.
Find the direction of the resultant force on x
A. P.
B. Q
C. R
D. S
29. Figure 4 shows a rectangular frame work which can be sheared by force
The frame work will resist the shear due to the force if the beam is fixed along
A. SQ.
B. PQ.
C. PR.
D. SR.
30. A heating element of resistance 40Ω produces360kj of heat in 5mins.find the current flowing through the element.
A. 5.5 A
B. 27.4 A
C. 30.0 A
D. 42.4 A
31. A power of is developed when a body of mass 200 g is raised to the top of in 20 s. find the height of the wall
A. 5.0 x 10-3 m
B. 5.0 x 10-2 m
C. 5.0 x 10-1 m
D. 5.0 x 100 m
32. Three cells each of e.m.f 2V are connected in parallel. What is the effective e.m.f of the arrangement?
33. An alloy is made of 70 g of tin and30g of lead. Find the volume of the alloy in cm3.
(density of lead =11.3 gcm-3).
A. 4.81x 10-1 cm3.
B. 5.38 x 100 cm3.
C. 1.03 x10-1 cm3
D. 1.23 X101 cm3.
34. A trolley of mass 1.5 kg moves with an acceleration of 2 ms-2when pulled by an elastic cord. If the tension in the cord is 5 N, find the frictional force.
A. 2.0 N
B. 2.5 N
C. 3.0 N.
D. 8.0 N.
35. An object of height 1cm is placed 4 cm from a convex lens forms an image five times the height of the object. Find the distance of the image from the lens.
A. 0.80 cm.
B. 1.25 cm.
C. 4.00 cm.
D. 20.00 cm.
36. In an electrical appliance, a fuse is connected to the live wire order to
A. Increase the current entering an appliance.
B. Protect the appliance in case of 100 much current entering it.
C. Protect the person using the appliance from getting an electric shock.
D. Quicken the conversion of electrical energy to heat energy by an appliance.
37. A kettle rated 1200 W contains 2 kg of water at 250C. How long would it take to raise the temperature of water to 850C if 80% of the electrical energy supplied is absorbed by the water?
A. 5.60 min
B. 7.00 min
C. 8.02 min
D. 8.75 min.
38. A body stars from rest and accelerated uniformly at a rate of 8 ms-2.find the time it takes to cover distance of 100 m.
A. 25.0 s.
B. 12.5 s.
C. 5.0 s.
D. 3.5 s
39. Two objects P and Q are place along a straight line in front of a plane mirror. If Q is 1 m from the mirror and the image of P is 4 m from Q, find the distance of P from the mirror.
A. 2.0 m.
B. 3.0 m
C. 5.0 m
D. 6.0 m
40. Figure 5 shows tank contain mercury and water
Find the pressure exerted by the two liquids on the bottom of the tank.
(Density of water =1.0 x 103 kgm-3, density of mercury = 1.36 x 104 kgm-3)
A. 2.00 x104 pa
B. 3.88 x105 pa
C. 4.08 x 105 pa
41. (a) State Charles ‘law.
(b).The graph of volume against temperature of a fixed mass of gas at constant pressure is as shown in figure 6.
Calculate the value of V in the graph.
42. (a) what are isotopes?
(b) In what ways does the nucleus of uranium 238 differ from nucleus of uranum235?
(c). why can’t isotope be separated by chemical methods?
43. (a) state the law of conservation of energy.
(b) Write in order of occurrence the energy changes which occur in a lighting solar system.
(c). Name one device which converts electrical energy to sound energy.
44. (a) what are girders?
(b) State two ways of reducing the notch effect from spreading in apiece of wood.
(c) Amass of 10kg stretches aspiring by4cm..Find the spring constant.
45. (a) what is magnetic field?
(b) What is meant by magnetic saturation?
(c) Explain why a freely suspended bar magnet swings until it points North-south.
46. A block and tackle pulley system is used to raise a load of 4ooN steadily through a height of 15m.if the work done against friction is 1000J, calculate the,
(a) Work input
(b) Efficiency of the system.
47. (a) (i) Draw a diagram to show the effect of a narrow gap in the path of plane waves.
(ii) Define interference of waves.
(b) A radio waves has wave length of 300cm.calculate the frequency of the radio wave. (Speed of light=3.0 x108 ms-1)
48. (a) what is meant by refractive index of a medium?
(b) (i) A ray of light travelling from glass it air is refracted along the boundary OX as shown below in figure 7
If the refractive index of glass is 1 .52, find angle C
( ii) State two application of total internal reflection.
49. (a) state two factors that affect pressure exerted by a solid on a surface
(b) Calculate the pressure at a depth of 20.0 cm in a liquid of density 13600 kgm-3
50. A 3KW immersion heater is used for 8h each week, and a 200 W filament lamp is used for 5 h daily in a week,
Find the
a) Total energy consumed each week.
b) Total cost of using these appliances each week if one unit of electricity costs shs1000.