PHYSICS MOCK EXAM QUESTIONS FOR SS3

SS3 PHYSICS MOCK EXAM QUESTIONS – EDUDELIGHT.COM

MOCK EXAMINATION                                       

Examination malpractices may lead to a repeat of the subject or suspensions don’t be involved.

SUBJECT:    PHYSICS             TIME ALLOWED: 2 ½ HRS         CLASS:         S.S 3

                                    OBJECTIVES

SECTION A: This section contains 50 questions each of options lettered A-D. Choose the correct option that best answer each question and shade correctly on the answer sheet.

• In which of the following states of matter do molecules vibration about their mean position? (a) liquids only (b) solids only (c) liquids and gas only (d) solids, liquids and gases
• Which of the following properties of a steel bar can be measured in terms of the dimension of length only? (a) weight (b) density (c) pressure (d) volume
• In hydraulic press, a force of 40N is applied to the smaller piston of area 10cm². If the area of the larger piston is 200cm², calculate the force obtained (a) 800N (b) 500N (c) 80N (d) 50N
• A body of volume 0.046m³ is immersed in a liquid of density 980kgm^-3 with ¾ of its volume submerged. Calculate the upthrust on the body (g=10ms^-2) (a) 11.27N (b) 33.81N (c) 112.70N (d) 338.10N
• Which of the following types of motion will be produced when a pair of equal and opposite non-collinear parallel forces acts on a body (a) vibrational  motion (b) random motion (c) translational motion (d) rotational motion
• A body moving in a circle at constant speed has i. A velocity tangential of the circle ii. A constant kinetic energy iii. An acceleration directed towards the circumference of the circle. Which of the statement(s) above are correct? (a) I and II only (b) II and III only (c) I only (d) I, II and III
• A car moves with a speed of 30m/s. Calculate the distance travelled in 30s (a) 30m (b) 60m (c) 450m (d) 900m
• A moving body accelerates when it (a) changes its direction at constant speed (b) maintains constant linear speed (c)covers equal distances in equal times in a straight line (d) is acted upon by forces
• The following properties of a solid are measured on earth: I. weight II. Specific heat capacity III. Density. Which of the properties will have different value if measured in space? (a) I only (b) II only (c) III only (d) II and III only
•  Which of the vector diagrams below represents the following position vectors   ,     ,           ,         

V₁      V₂                                      V₁  V₂

•                                             (b)                                

V₃      V₄                                      V₃   V₄

(c)             V₁      V₂                              (d)                 V₁       V₂

                          V₄      V₃                                        V₃   V₄

• Two forces 6N and 8N act eastwards and northwards respectively on a body. Calculate the magnitude of their equilibrant (a) 2N (b) 7N (c) 10N (d) 14N
•  The period of simple pendulum of length 80.0cm was found to have doubled when he length of the pendulum was increased by X. Calculate X (a) 26.7cm (b) 40.0cm (c) 160.0cm (d) 240.0cm
•  A body of mass 10kg moving with a velocity of 30m/s due east is suddenly hit by another body and changes its velocity to 50m/s in the same direction. Calculate the magnitude of the impulse received (a) 100Ns (b) 150Ns (c) 250Ns (d) 400Ns
•  Electrical energy is measured in (a) Ampere (b) Coulomb (c) Kilowatt-hour (d) kilowatt
•  A stone of mass 0.5kg is dropped from a height of 12m. Calculate its maximum kinetic energy (a) 3.0J (b) 6.0J (c) 30.0J (d) 60.0J 
• A machine of efficiency 80% is used to lift a box. If the effort applied by the machine is twice the weight of the box, calculate the velocity ratio of the machine (a) 0.50 (b) 0.63 (c) 0.80 (d) 60.0
• A faulty thermometer register 102.5⁰ at 100⁰C. If the thermometer has no zero error, what will it register at 55⁰C? (a) 54.6⁰ (b) 55.0⁰ (c) 56.4⁰ (d) 56.0⁰
• A rod of initial length 2m at a temperature of 25⁰C is heated to 80⁰C. Calculate the increase in length of the rod if its linear expansivity is 4.0×10^-3K^-1 (a) 0.26m (b) 0.44m (c) 0.53m (d) 0.84m
• As a bicycle tyre was being pumped up, it was noticed that contrary to Boyle’s law the volume increased as the pressure increased. The best explanation of this is that Boyle’s law is only true for (a) ideal gases (b) a fixed mass of gas (c) a mixture of gas (d) a gas at variable temperature
• It takes 4 minutes to boil a quantity of water using an electrical coil. How long will it take to boil the same quantity of water using the same heating the current is doubled? (Neglect any external heat loss) (a) 8 minutes (b) 4 minutes (c) 2 minutes (d) 1 minute
• When table salt is added to ice, the melting point of the ice (a) is raised (b) is lowered (c) remains unchanged (d) is first raised, then lowered
• Which of the following factors affect the rate of evaporation of a liquid? I. Exposed surface area II. Temperature of the surroundings III. Thermal capacity of the liquid IV. Relative humidity of the surrounding (a) II and III only (b) II, III and IV only (c) I, III and IV only (d) I, II and IV only
• Which of the following instruments is used to measure relative humidity? (a) hydrometer (b) barometer (c) hypsometer (d) hygrometer
• The maximum displacement of a vibrating tuning fork is its (a) amplitude (b) frequency (c) period (d) wavelength
• A boat is rocked by waves of speed 30m/s whose successive crests are 10m apart. Calculate the rate at which the boat receives the waves (a) 30s^-1 (b) 10^-1 (c) 3s^-1 (d) 1s^-1
• Which of the following waves is not transverse? (a) light waves (b) sound waves (c) sea waves (d) radio waves
• Light travelling through a small pin hole usually does not make shadow with a distinct sharp edge because of (a) diffraction (b) interference (c) reflection (d) refraction
• The angle of incidence of a ray of light on a plane mirror is 55⁰. Determine the angle between the reflected ray and the mirror (a) 35⁰ (b) 45⁰ (c) 55⁰ (d) 110⁰
• A concave mirror forms magnified and erect image only when the object is placed (a) at the centre of the curvature (b) at the focus (c) between the focus and the pole of the mirror (d) beyond the radius of curvature
• A thin lens is placed 50cm from an illuminated object. The image produced has linear magnification of ¼. Calculate the power of the lens in diopters (a) 2.5D (b) 5.0D (c) 10.0D (d) 25.0D
• Which of the following characteristics of light determine its colour? (a) velocity (b) wavelength (c) amplitude (d) intensity
• Which of the following is not a part of electromagnetic spectrum? (a) X-rays (b) microwaves (c) infrared radiation (d) alpha rays
• Sound interference is necessary to produce the phenomenon of  (a) beats (b) Doppler effect (c) acoustic resonance (d) echo
• A satellite in circular motion around the earth does not have (a) a gravitational force acting on it (b) a uniform velocity (c) an acceleration (d) a centripetal force acting on it
• When a conductor mounted on an insulating stand is charged and left for some time, the conductor eventually loses all its charges. This is because the (a) electric charges evaporate from the charge surface of the conductor (b) are conducted to earth (c) charges on the conductors are neutralized by opposite charges from the surrounding air (d) charges ionize the surrounding air

Use the information below to answer questions 36 and 37

An isolated metal sphere of radius R, carrying an electric charge, Q is situated in a medium of relative permittivity; A test charge is placed at a point P, distance r from the surface of the sphere. Let represent the permittivity of free space

• The electric potential at P is given by the relation (a)  (b)  (c)  (d) 
• The magnitude of the electric field intensity at P is given by the expression (a)    (b)    (c)    (d)
• A resistor of resistance R is connected to a battery of negligible internal resistance. If a similar resistor is connected in series with it the (a) effective resistance of the circuit is halved (b) total power dissipated is doubled (c) total current in the circuit is halved (d) terminal voltage is halfed
• A cell of e.m.f 1.5v is connected in series with a resistor of resistance 3.0Ω. A voltmeter connected across the cell registers 0.9V. Calculate the internal resistance of the cell (a) 2.0 (b) 3.0Ω (c) 5.0Ω (d) 6.0Ω
•  A wire of resistivity 4.40×10^-5 Ω cm has a cross sectional area of 7.50×10^-4 cm². Calculate the length of this wire that will be required to make a 4.0Ω resistor (a) 82.50 Ω (b) 68.18 Ω (c) 15.90 Ω (d) 11.94 Ω
• A battery of emf 120V and internal resistance 0.5 Ω and 4.0 Ω series resistors. Calculate the terminal voltage of the battery (a) 13.0V (b) 11.0V (c) 3.0V (d) 1.0V
• If the direction of the current in a straight wire is reversed, the magnetic field  (a) remains the same (b) becomes parallel to the wire (c) ceases to exist (d) is oppositely directed
• An ideal step-down transformer steps up (a) power (b) energy (c) current (d) voltage
• An inductor of inductance 1.0H is connected in series with a capacitor of capacitance 2.0uF in an a.c. circuit. Calculate the value of frequency that will make the circuit to resonate (a) 112.5Hz (b) 225.0Hz (c) 353.5Hz (d) 707.21Hz
• An ammeter connected to an a.c circuit recorded 5.5A. The peak current in the circuit is (a) 7.8A (b) 7.1A (c) 3.9A (d) 3.5A

The table below shows the energy levels of an atom. Use it to answer questions 46 and 47

Energy level (n)	1	2	3	4
Energy(eV)	-13.6	-3.39	-1.51	-0.85

(h=6.6×10^-34Js; e=1.6×10^-19C; c=3.0×10⁸ms^-1)

• Calculate the first excitation energy of the atom (a) 1.60×10^-19J(b) 1.02×10^-18J (c) 1.60×10^-18J (d) 1.02×10^-19J
• If the atom de-excites from n=2, wavelength of the emitted radiation is (a) 2.4 x10^-7m (b) 1.2 x10^-7m (c) 2.4 x10^-9m (d) 1.2 x10^-9m
•  Two isotopes of uranium are designated 238U and 235U. The numbers 238 and 235 represent their (a) atomic numbers (b) nucleon numbers (c) proton numbers (d) neutron numbers
• The main difference between x-rays and gamma rays lies in their (a) ionizing ability (b) absorption rate (c) mode of production (d) mode of propagation
• An electron of mass 9.1×10^-31kg moves with a speed of 10⁷ms^-1. Calculate the wavelength of the associated wave. (h=6.6×10^-34Js) (a) 9.10 x10^-24m (b) 4.55 x10^-17m (c) 7.25 x10^-11m (d) 6.20 x10^-8m

SS3 PHYSICS MOCK EXAM QUESTIONS – EDUDELIGHT.COM

SECTION B

PART I

Answer any five questions from this section. All questions in this section carry equal mark (3 marks per question).

1. In the diagram illustrated, a body of mass m slides on an inclined plane. Show that the coefficient of friction between the surfaces in contact is tanɵ

R                 F

                                                Fp         Mg

• A spiral spring with a metal extends by 10.5cm in air. When the metal is fully submerged in water, the spring extends by 6.8cm. Calculate the relative density of the metal. (Assume Hooke’s law is obeyed)

• A ray of light is incident on an air-glass boundary at an angle ɵ. if the angle between the partially reflected ray and the refracted ray is 90⁰, calculate ɵ, given that the refractive index of glass is 1.50.

• (a) Explain the term electrodes in electric cells.
• An electric current passing through an electrolyte for 2 minutes deposited 200g of a substance. If the electrochemical equivalent of the substance is 8.33×10^-4 gC^-1, calculate the current passed.

• Explain why sound waves cannot be plane polarized.

• (a) Define surface tension

(b) State two methods by which the surface tension of a liquid can be reduced.

• Explain why it is desirable to install an air conditioner near the ceiling of a room and not close to the floor.

• (a) On what principle does lighting in a fluorescent tube operate?

(b) State two factors which determine the colour of light produced in a fluorescent tube.

• Electron gun

    S

                                                                                N

The diagram above illustrates an arrangement of a cathode ray from an electron gun and a bar magnet placed perpendicularly to the direction of the ray. Will the ray bend downward or upward? Explain.

1. (a) Explain wave-particles duality of light

(b) Illustrate your answer in 10(a) with observable phenomena.

PART II

Answer any three questions from this section. All questions in this section carry equal mark (15 marks per question).

1. (a) state the principle of conservation of linear momentum

(b) Explain the mode of action of a propelled rocket.

(c) During a training session, two footballers pass a ball repeatedly between themselves. Give two reasons why the to and fro motion of the ball is not simple harmonic

(d) A ball is dropped from a height, at the same time as another ball is projected horizontally from the same height. (i) Would the balls hit the ground at the same time? (ii) Explain your answer in (i)

(e) A ball of mass 0.10kg is projected horizontally onto a vertical wall with a speed of 13 ms^-1. Calculate the: (i) change in momentum of the ball; (ii) average force exerted on the ball during its collision with the wall.

1. (a) (i) What is a machine? (ii) State two uses of gears (iii) Define the velocity ratio for a pair of gear wheels (iv) How can the mechanical advantage of a gear system be increased?

(b)

The diagram above illustrates the gears system of a bicycle. (i) Determine its velocity ration. (ii) If the bicycle has an efficiency 90%. Calculate the effort required to overcome a load of 70N (iii) Why is the calculated effort less than the actual effort required?

1. (a) Explain the term critical angle.

(b) List two factors which determine the deviation of a ray of light by a triangular glass prism.

(c) The angle of refraction (r) of a ray of white light from air through a triangular glass prism of refractive index 1.5 is 29.0⁰. Calculate the angle through which the ray is least deviated.

(d) Study the ray diagram below and use it to answer the question that follow.

                                                     A

                                                     60⁰

                                                        _D               

                                      45^{0       20                      )e}

                                                ^{p              R}

                                                      ^Q)60

                             B                                          C

Calculate the: (i) values of angles P, Q and R (ii) refractive index n of the glass prism (iii) value of e (iv) total deviation D

1. (a) define magnetic line of force

(b) A wire of length 10cm carrying a current of 4.0 A is placed between the poles of a powerful electromagnet of magnetic flux density 2.0 T. calculate the (i) force on the wire when it is parallel to the field (ii) maximum force on the wire (iii) force on the wire when it makes an angle of 60⁰ with the field (c) Describe how keepers can be used to preserve the magnetic strength of permanent bar magnets.

(d) A sailor observes that his mariners’ compass reads N 10⁰ W at a place where the angle of declination is #15⁰ W. Calculate the true bearing of the place.

1. (a) (i) explain why x-rays can be used to produce photographs of fractures in bones. (ii) List four uses of x-rays other than in medicine

(b) State the energy transformations which takes place during the operation of an x-ray tube.

(c) (i) explain three named dangers to which human beings may be exposed when subjected to large doses of x-rays. (ii) State two precautions that must be taken by persons working with x-rays.

(d) In an x-ray tube, an electron is accelerated from rest towards a tungsten target biased at a potential of 33 KV. Calculate, for the electron, the (i) kinetic energy (ii) velocity.

{h = 6.6 x 10^-34 Js; Me = 9.1 x 10^-31 kg; c = 3.0 x 10^-8 ms-1; e = 1.6 x 10^-19 C}

SS3 PHYSICS MOCK EXAM QUESTIONS – EDUDELIGHT.COM