UNEB UCE PHYSICS PAPER 1 Nov./Dec. 2001

2001 UNEB

(01.P1.Q.1)  A body is said to be moving with uniform velocity when the rate of change of

(a)  acceleration with time is constant

(b)  velocity with time is constant

(c)  distance with time is constant

(d)  displacement with time is constant.

(01.P1.Q.2)

In the diagram in figure 1,the magnitude of the resultant force acting on a body is

a)  1N b)  5N

c)  7N d)  11N

(01.P1.Q.3)  A force of one Newton acts on a mass of 0.05 kg initially at rest, its acceleration is

a)  0.05 b)  0.5 c)  2 d)  20

(01.P1.Q.4)

A uniform rod 100cm long pivoted at the 90^th cm mark, balances horizontally when a mass of 200g is suspended at the 100cm mark as shown in the figure. The mass is a)40g b)50g c)400g d)800g

(01.P1.Q.5)

The diagram in the figure 3 shows an oscillation pendulum lob. Which of the following statements is true about its motion?

1. the kinetic energy at B is equal to the kinetic energy at A
2. the kinetic energy at B is less than the potential energy at A
3. the kinetic energy at B is equal to the potential energy at A.
4. the kinetic energy at B is greater than the potential energy at Z

(01.A.Q.6) A domestic refrigerator uses a volatile liquid. Which of the following represents the order of the process the liquid undergoes?

a)  Evaporation compression condensation evaporation.

b)  Cooling condensation evaporation compression evaporation.

c)  Compression evaporation condensation cooling evaporation.

d)  Condensation cooling evaporation compression evaporation.

(01.A.Q.7) An engine exerts a forc3eof 2000N at a speed of 15ms^-1. Find the power developed by the engine in kW

(a) 30000 (b) 3000 (c) 300 (d) 30

(01.A.Q.8) Which one of the following is true about a manometer?

(i) It uses mercury because mercury is a good conductor of heat. (ii) It is used for measuring gas pressures. (iii) The maximum height of mercury it can support is 760mm.

(a) (i) and (ii) only (b) (i) and (iii) only (c) (ii) only (d) (ii) and (iii) only.

(01.A.Q.9) What is 730mm in Nm²

(a) 13600x1000x10 (b) 13600x730x10 (c) 13600X730

730 1000 1000X10

(d) 13600×10

1000×730

(01.A.Q.10) A metal cylinder contains a liquid of density 1100kg/m³. The area of the base of the cylinder is 0.005m² and the height of the liquid is 5m. Calculate the force exerted by the liquid at the base of the cylinder.

(a) 27.5N (b) 55N (c) 220N (d) 275N

(01.A.Q.11) A tin containing 6×10³m³ of paint has a mass of 8kg. If the mass of the empty tin with the lid is 0.5kg, calculate the density of the paint in kgm^-3

(a) 8×0.5 (b) 7.5 (c) 8×10⁶ (d) 8.5×10⁶

6×10^-3 6×10³ 6×10^-3 6×10³

(01.A.Q.12) A blue copper sulphate crystal placed at the bottom of a beaker containing water is found to spread throughout the water after sometime due to

(a) Osmosis (b) Diffusion (c) Capillarity (d) Surface tension

(01.A.Q.13) A block of lead of mass 1000g hits a hard surface without rebounding with a velocity of 23ms^-1. if the temperature rises from 25⁰c to27⁰c. calculate the specific heat capacity of lead.

(a) 5.75 J kg^1
0c¹ (b) 9.79 J kg^1
0c¹ (c) 132.25 J kg^{1 0}c¹ (d) 264.50 J kg^{1 0}c

(01.A.Q.14.) The figure shows an arrangement of three planks on a vertical Frame. Which planks can be replaced by ropes?

(a) 1 and 3 (b) 1 and 2 (c) 3 and 2 (d) 1, 2, and 3

(01.A.Q.15)

The diagram shows three identical spring balances X, Y, and Z arranged as shown in the figure below supporting a load of 10N. At equilibrium, the spring Z is extended by e meters. The extension of X and Y are

X(m) Y(M) X(M) Y(M)

A. e/2 e/2 B. e e

C. 2e 2e C. 3e 3e

(01.A.Q.16) The brightness on the screen of a T.V is determined by

(a) darkness in the room (b) the size of the screen (c) the number of electrons reaching the screen (d) direction of the aerial

(01.A.Q.17) When Uranium 235 is bombarded with a neutron, it splits according to the equation ²³⁵₉₂U+¹₀n ^M_NP +⁹²₃₆Kr+3¹₀n. M and N on P represent

M N

A. 56 141

B. 141 56

C. 199 36

D. 107 128

(01.A.Q.18) A source producing waves which travel a distance of 140cm in 0.08 s. if the distance between successive crests is20cm, find the frequency of the source.

(a) 0.875Hz (b) 8.750Hz (c) 87.500Hz (d) 8750Hz

(01.A.Q.19) A man sees the flash from a gun fired 1020m away and then later he has a bang. How long does the bang take to reach him. (Take speed of sound as 340ms^-1)

(a) 1020 s (b) 340 s (c) 1020 s (d) (340×1020)s

340×10 1020 3400

(01.A.Q.20) A student is holding a white paper with green printing on it. If she enters a room with red lights, she will see

(a) black printing on a red paper (b) blue printing on a red paper (c) yellow printing on a red paper (d) a red printing on a white paper.

(01.A.Q.21) Which of the following shows the order in increasing wave length of the members of the electro-magnetic spectrum?

(a) Ultra-violet, X-ray, radio waves, infra-red. (b) radio waves, infra-red, X-rays, Ultra-violet (c) X-rays, ultra-violet, infra-red, radio waves (d) Gamma rays, ultra-violet, radio waves, radio waves, infra-red.

(01.A.Q.22) The laws of electrostatic induction states that

(a) like poles repel and unlike poles attract (b) like poles attract and unlike poles repel (c) like charges repel and unlike charges attract (d) like charges attract and unlike charges repel.

(01.A.Q.23) The strength of the magnetic field between the poles of an electro- magnet remains the same if the

(i)  current in the electro-magnetic windings is doubled

(ii)  direction of the current in the electro-magnet winding are reserved.

(iii)  The number of turns is halved.

(a)  (i) only (b)  (ii) only

(c)  (i) and (ii) only  (d)  (ii) and (iii) only.

(01.A.Q.24) How many kilowatt hours are used to run

(i) 8 kW cooker for 1 hour (ii) 3 kW immersion heater for 40 minutes (iii) 960w hair dryer for 20 minutes

(a) 10.32kwh (b)147.20kwh (c) 768.00kwh (d) 971.00kwh

(01.A.Q.25) A tape is pulled through a ticker-timer which has a frequency of 50Hz. If the distance between successive dots is 2cm, calculate the speed of the body

(a) 0.01cm S^-1 (b) 50cm S^-1 (c) 100cmS^-1 (d) 250cmS^-1

(01.A.Q.26) Which of the following forms mechanical energy

(a) electrical energy and kinetic energy (b) potential energy and nuclear energy (c) nuclear energy and kinetic energy (d) potential energy and kinetic energy

(01.A.Q.27) A diver dives to a depth of 20m below the surface of water of density of 1.0×10³kgm^-3. the increase in pressure he experiences in Nm^-2 is

(a) 5.0×10² (b) 1.0×10⁴ (c) 2.0×10⁴ (d) 2.0×10⁵

(01.A.Q.28) The rate of evaporation from a body is increased by

(i) temperature (ii) pressure (iii) liquid with greater cohesive forces (iv) dryness of air around the body

(a) (i) and (ii) only (b) (ii) and (iii) only (c) (i) and (iv) only (d) (iii) only.

(01.A.Q.29) Which of the following are brittle substances?

(a) Dry clay, steel, chalk, wood (b) Chalk, steel, plastic, glass (c) Glass, chalk, concrete and steel (d) Dry clay, glass, chalk and concrete.

(01.A.Q.30) An object 2cm tall is placed 5cm in front of a convex lens. A real image is produced 20cm from the lens. Calculate the magnification of the lens.

1. 4 (b) 2 (c) 0.5 (d) 0.25

(01.A.Q.31) The effective resistance when two resistors of 5Ω and 15Ω joined in series are placed in parallel with a 20Ω resistor

(a) 0.1Ω (b) 10Ω (c) 20Ω (d) 40Ω

(01.A.Q.32) A lift accelerates uniformly from rest for 3s. it then moves at uniform velocity for 15s then decelerates uniformly for 2s before coming to rest. Which of the following velocity-time graphs represent the motion of the lift?

(01.A.Q.33) A constant force of 5N acts on a body and moves it through a distance of 20m in 10 seconds. Calculate its power.

A. 2.5W B. 10W C. 40W D. 100W

(01.A.Q.34) 450g of water at 60^°C is to be cooled to 35⁰c by addition of cold water at 20⁰c. how much cold is to be added?

(a)0.169kg (b) 0.270 kg (c) 0.281kg (d) 0 .75kg

(01.A.Q.35) Which of the following are properties of cathode rays?

(i) they are electrically neutral (ii) they travel in straight lines (iii) they are deflected by magnetic fields

(a) (i) and (ii) only (b) (i) and (iii) only (c) (ii) and (iii) only (d) (i), (ii) and (iii) only

(01.A.Q.36)

The diagram in the figure shows parallel wave fronts approaching a narrow gap. Waves passing through the gap are likely to under go

(a) Reflection (b) refraction (c) diffraction (d) interference

(01.A.Q.37) Which one of the following is correct

(i)  green light shone on the green surface is all absorbed

(ii)  green light added equally to red light appears yellow

(iii)  green light passes through a red filter

(a)  (ii) only  (b)  (i) and (ii) only  

(c)  (ii) and (iii) only (d)  (i), (ii) and (iii)

(01.A.Q.38) Which of the following factors affect the strength of an electro magnet?

(i) change magnitude of the current (ii) change direction of the current (iii) double number of turns

(a) (ii) only (b) (i) and (ii) only (c) (i) and (iii) only (d) (ii) and (iii) only

(01.A.Q.39) When a 240V supply is connected across an electric appliance, a current of 200mA flows in the circuit. What is the electric power supplied to the appliance

(a) 1.2W (b) 48.0W (c) 48000.0W (d) 120000.0W

(01.A.Q.40) Which one of the following is true about a hydrometer?

(i) it measures density of a liquid (ii) its sensitivity is improved by narrowing its stem (iii) its reading increases upwards on the stem (iv) its buoyancy is provided by the large bulb.

(a) (i) (ii) and (iii) (b) (ii) (iii) and (iv) (c) (i) (ii) and (iv) (d) (ii) and (iv) only.

SECTION B

(01.B.Q.41)  (a)  The diagram in the figure shows a metal sphere of weight W in equilibrium.

Complete the diagram to show the forces acting on the metal sphere.

(b)  State two effects that a force can have on a body

(01.B.Q.42)

Two gear wheels A and B with 80 and 20 teeth respectively lock into each other. They are fastened on axles of equal diameters such that a weight of 150N attached to a string

wound around one axle raises a load of 450N attached to a string wound around the other axle as shown in figure 8.

(i)  the velocity ratio (2 marks).

(ii)  the efficiency of the system. . (2 marks).

(01.B.Q.43)

A pin is placed on a bloating paper which is on the surface of water as shown in figure 9.

(a)  Explain what happens after some time. (2 marks)

(b)  Explain what happens when some soap solution is carefully added to the water.

 (2 marks)

(01.B.Q.44)  (a)  Sketch the variation of volume with temperature in Kelvin, for a gas at

constant pressure. (2marks)

(b)  State any two advantages of mercury as a thermometric substance (1mark)

(c)  What is a saturated vapor?

(01.B.Q.45)  (a)  Describe how a straight wave is produced in a ripple tank. (2marks)

(b)  State the conditions of the occurrence of destructive interference of waves.

 (2marks)

(01.B.Q.46)  (a)  Complete the diagram in figure 10 to show the path of the light ray PQ through

the prism(1mark)

(b)  Light traveling in water is incident at a water-air surface at 30⁰. what is the angle of refraction if the refractive index from air to water is 1.33?  (3marks)

(01.B.Q.47)

(a)  State one advantage of a.c over d.c in a mains supply.(1mark)

(b)

In the figure11 shows the variation of an a.c with time.

Find  (i)  the peak value (1mark)

(ii)  the frequency  (2marks)

(01.B.Q.48)  (a)  What is meant by short circuit as applied to electricity? (1mark)

(b)  the electric appliance is marked “240V 4Kw”.

(i)  What does this statement mean?  (1mark)

(ii)  calculate the current drawn by the appliance in normal use  (2marks)

(01.B.Q.49)  (a)  What is thermonic emission? (1mark)

(b)  (i)  state the function of the fluorescent screen in a cathode ray

oscilloscope. (1mark)

(ii)  Give two applications of cathode ray oscilloscope.  (2marks)

(01.B.Q.50)

A radioactive source emits radiation, which is directed between two positively charged metal plates as shown in the figure 12 above.

(a)  Name the radiation labeled A, B and C. (1¹/₂ marks)

(c)  What happens when the radioactive source is completely covered with an ordinary sheet of paper (1mark).

**********