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INTRODUCTION TO PHYSICS

01.  (i)Define;         (a)Physics   (b) Energy  (c) matter.

            (ii)Give three states of matter..

02.  (a)What is   (i) A fact?   (ii)  theory ?

            (b)Give the application of physics at home. At least five application.

03.  Briefly explain how physics is applied in;-

            (a) Medicine

            (b) Agriculture

            (c) Industries.

INTRODUCTION TO LABORATORY PRACTICE

01.  (a)What is the laboratory?

           (b)Give five features of a good laboratory.

02.  (a)What is an experiment?

           (b)Mention five laboratory rules.

03.  (a)What is the laboratory accident?

           (b)Give at least six causes of a laboratory accident?

04.  (a)What is        (i) First aid ?

                                    (ii) First aid kit?

            (b)List ten components of the first aid kit and clearly state the use of each when

              attending a victimized person.

 

 

MEASUREMENTS IN PHYSICS

01.  Define:

a)      mass

b)      Length

c)      Volume

d)     Scalar quantity

e)      Vector quantity .

02.  What are

a)      Fundamental quantities ?

b)      Derived quantities?

Give four (4) examples of each .

03.  Give four (4)differences between Mass and Weight .

04.  Draw a well labeled diagram which shows ,

(i)                 Micrometer screw gauge

(ii)               Vernier calipers

(iii)             Spring balance

05.  What are the operational principle of,

                 (i) A beam balance ?

                 (ii) Spring balance ?

06.  What was the weight of the following masses when the earths gravitational pull at  the place was 9.8N∕ kg ,

a)      0.02kg ?  (b) 24g? (c) 0.72tonne?

b)      56kg ?

07.  How many liters are there in 4500m3 of water ?


DENSITY AND RELATIVE DENSITY

01.  A tin containing 5000cm3 of paint has a mass of 7.0kg

(i)     if the mass of the empty tin: include the lid is 0.5kg. calculate the density of the paint.

(ii)   If the tin is made of metal which has a density of 7800kg/m3; calculate the of the metal used to make the metal and the lid.

02.  An object has a mass of 100kg and a volume of  20m3. what is its density?

03.  An object has a mass if 40000kg and a volume of 5m3. What is its density?

04.  A water tank measures 2m x 4m x 5m. what mass of water will it contain?( Hint: Density of water = 1000kg/m3)

05.  An object has a mass of 2000kg and a density of 4000kg/m3. What is its volume?

06.  A stone of mass 30g is placed in a measuring cylinder containing some water. The reading of the water level increases from 50cm3 to 60cm3. what is the density of the stone?

07.  The density of air is 1.3kg/m3. what mass of air is contained in a room measuring 2.5m x4m x10m?

08.  What is the  mass of a piece of wood of density 0.6g/cm3 and volume.

 

FORCES

01.  (a). Define Force.

            (b) State and define the SI Unit of force.

02.  Give at least eight types of force.

03.  (a) What is friction?

(b) Give the two types of friction

04.  Define:

(i)     Limiting friction

(ii)   Dynamic friction

05.  (a) Give:

(i)     Three merits of friction

(ii)   Three negative effects of friction

            (b)Name three best ways of reducing friction

06.  Briefly explain the following:-

a)      Working on wet ice is difficult

b)      It is more difficult to pull a boat on the beach than in the sea,

c)      Wet flows and wet roads are dangerous

d)     cars are likely to skid on loose gravel.

e)      Aborigines lights fires by rubbing pieces of wood together

f)       Sliding down a rope can burn you

g)      Racing cyclist wear smooth tight clothes

h)      Speed boats have sharper bows than barges.    


ARCHIMEDES PRINCIPLE AND LAW OF FLOATATION.

01.   (a) State Archimedes principle.

             (b)A block of metal density 2700kg/m3 has a volume  of 4.0 x 10-2m3. Calculate:-

(i)     The mass of the block

(ii)   The apparent weight when immersed in a brine of density 1200kg/m3.

02.  (a)State the law of floatation.

(b)A piece of cork with volume 100cm3 is floating on water. If the density of cork is 0.25g/cm3.

(i)     Calculate the volume of cork immersed in water.

(ii)   What force is needed to immerse the cork completely?

(Assume mass of 1gm has weight of 0.01N).

(c)Ice has a density about 0.9g/cm3.What fraction of the volume of an ice berg is

       submerged in water?

03.  A metal cube of sides 2cm weigh 0.56N in air. Calculate;-

a)      Its apparent weight when immerse in white spirit of density 0.85g/cm3.

b)      The density of a metal which it is made.

04.  An ordinary hydrometer of mass 28g floats with 3cm of its 0.75cm2.Find the total volume of the hydrometer and length of stem above the surface when it floats in a liquid of relative density 1.4.

05.  A block of wood mass 24kg floats in water. The volume of wood is 0.032m3 Find:-

a)      The volume of the block below the surface of the water.

b)      The density of the wood.[Density of water = 1000kg/m3]


06.  (a) Define:-

(i)     Density

(ii)   Up thrust

(iii) Apparent weight.

(b). A cube of wood volume 0.2m3 and density 600kg/m3 is placed in a liquid of density 800kg/m3.

(i)     What fraction of the volume of the wood would be immersed in the liquid?

(ii)   What force must be applied to the cube so that the top surface of the cube is on the same level as the liquid surface?

07.  Describe the structure and mode of action of a Hydrometer.

 


                         STRUCTURE AND PROPERTIES OF MATTER.

 

01.  (a)Define matter

            (b)Mention the three states of matter and give four (4) examples on each state.

02.  (a)Define;

(i)     Osmosis

(ii)   Capillarity

(iii) Surface Tension.

(b)Explain why;

(i)     Solids have a definite shape but liquids flows.

(ii)   Solids and liquids have  fixed  size but gases fill whatever container they are in.

03.  Explain why perfume can be smelt some distance away from the person wearing it.

04.  (a)What is Brownian movement?

(b)What change would you expect to see in the movement if the air was cooled down?

05.  Briefly Explain why a tent made of canvas keeps out of water during rainy period?

06.  Why is it that needle may float on clean water but sinks when some detergent is added to the water?

07.  (a)Define:

a)      Adhesion

b)      Cohesion.

            (b)Briefly explain why water wets in glass but mercury does not?

08.  A tin cane containing air is sealed, If then heated, what can you say about ;-

a)      The average speed of the molecules.

b)      How often the molecules hit the walls of the cane?

c)      How hard the molecules hit the walls?

d)     The air pressure inside the can?


09.  Explain the following;-

a)      Rain drops are almost spherical

b)      A needle sink if detergent is added into water.

c)      A needle can be floated on water.

d)     Hairs cling together when they are wet but not when they are dry.

e)      Small insects can stand on the surface of water without sinking?

f)       Paints stick to a wall.

g)      You can dry your hands with a towel but not with a sheet of polythene.

h)      Kerosene rises up of a wick of a lamp.

10.  (a)State Hooke’s law?

            (b)What is meant by elastic limit.

11.  Write a brief account of the phenomenon of diffusion in liquids and gases?


PRESSURE

01.  (a)Define Pressure and state its SI unit.

            (b)Define Pascal as a unit of force.

02.  A television tube has a flat rectangular end of size 0.40m by 0.30m.calculate thrust exerted on this end by the atmosphere, if the atmospheric pressure is 1.01 x105 N/m2.

03.  (a)What is the manometer?

(b)An open U- tube pressure gauge containing water shows a different in level of 15cm when connected to a gas  supply. Find in N/m2,the excess pressure of the gas above atmospheric pressure in N/m2,the excess pressure of the gas above Atmospheric pressure.

04.  State how pressure in a liquid depends on;-

a)      The depth of the liquid

b)      The density of the liquid

05.  (a)State two factors on which the pressure exerted by a liquid depends on.

(b)The atmospheric pressure on a  particular day was measured as 750mmhg.What is this pressure when it is measured  in Pascal’s (Pa) (N/m2).   (g)= 10n/kg

06.  (a) Define “bar”?

(b) The air pressure at the base of a mountain is 750cmHg and at the top is 60.0cmHg. Given that the average density of air is 1.25kg/m3  and the density of mercury is 13600kg/m3; Calculate the height of the mountain.

07.  Draw a labeled diagram of an aneroid barometer.

08.  Explain each of the following:-

a)      Eskimos wear snow shoes

b)      It is use full for camels to have large flat feet.

c)      A dam is thicker at its base than at the top.

d)     Deep sea divers have to wear very strong diving suits.

e)      A giraffe must have a stronger heart than human.

f)       A barometer will show greater  reading when taken down a  coal mine.

09.  In a hydraulic brake, a force of 500N is applied to a piston of area  5cm2.

a)      What is the pressure transmitted throughout the liquid?

b)      If the other piston has an area of 20cm2; what is the force exerted on it?

10.  (a) Define relative density?

            (b) In an experiment using Hare’s apparatus, the lengths of methanol  and water

           Columns were found to be  16cm to 12.80cm respectively.

(i)                 Find the relative density of methanol.

(ii)               If the length of methanol column was altered to 21.50cm; what will be the new height of the water column?

11.  (a) Define the term “Pressure”.

            (b) A rectangular log of wood of density 200kg/m3 has dimensions ;

0.3m x 0.5 m x 0.6m.

(i)     Calculate the maximum pressure it exert on the ground,  how is it experienced.

(ii)   Calculate  the minimum pressure it can exert on the ground. How can this be Observed.

 


WORK, ENERGY  AND  POWER.

Given;- acceleration due to gravity (g)= 10N/kg.

011.  (a) Define the term “Energy”.

(b)A ball of mass 0.2kg is dropped from a height of 20M.On impact with the ground it loses 30J of energy. Calculate the height it reaches on the rebound.

02.2.  (a)Define (i) Work  (ii) Power  (iii) Joule  (iv) Watt.

(b)Give the condition necessary for the work to be done.

033  (a)Briefly explain, when does a force become weight?

(b)A car of mass 1200kg is brought to rest by a uniform force of 300N, in 80sec.

What was the speed of the car?

044.  (a)Define:

(i)     Kinetic energy

(ii)   Potential energy.

(b)Mention at least five (5) forms of energy

(c)State the principle of conservation of energy.

055.  A man of mass 75kg climbs 300m in 30 minutes, At what rate is he working?

066.  What is the power output of a cyclist moving at a steady speed of 5.0m/s along a level  road against a resistance of 20N?

077.  A crane lifts an iron girder of mass 400kg at  a steady speed of 2.0ms-1.At what rate is the crane working?

088.  A box of mass 12kg is pulled up a straight smooth incline at 300 to the horizontal, for a distance of 5m.Calculate the work done.

099.  A man lifts a load of 720N through a height of 10m in 90sec. Calculate the man’s useful power.

1010.  (a)When does a force do work?

(b)A man whose mass is 75kg walks up a flight of 12steps each 20cm high in 5sec.

1111.  A ball of mass 1kg is dropped from a height of 7m and rebounds to a height of 4.5m Calculate ;-

a)      Its Kinetic energy just before impact   b) Its initial rebound velocity and K.E


LIGHT (SOURCE, TRANSMISSION and REFLECTION)

01.1  (a) Define:

(i)     Light

(ii)   Luminous body

(iii) Non-luminous body.

                 (b) Briefly explain why is light a form of energy.

022.  (a) What are:

(i)     Opaque materials

(ii)   Transparent materials

(iii) Translucent materials

    (b) Give three examples of each of the types of materials mentioned in (a) above.

033.  Describe, experimentally, the fact that light travels in a straight line.

04.  (a) What is a shadow?

            (b) Why are shadows formed?

            (c) Mention and explain the types of shadows.

054.  (a) What is:  (i) a ray of light?

                               (ii) a beam of light?

            (b) With the aid of diagrams; give the three types of beams of light.

065.  (a) What is reflection of light?

(b) With the aid of well labeled diagrams, differentiate the two types of reflection of light.

076.  (a)State the laws of reflection of light.

            (b) Give the common characteristics of the image formed by a plane mirror.

087.  (a)Distinguish between a Real and Virtual image.

            (b) Give the common characteristics of the image formed by a pin hole camera.

098.  Show that the image of an object observed in a plane mirror is as far behind the mirror as the object is in front and that it has the same size as the object geometrically.

109.  (a)What is a Periscope?

            (b) Draw a labelled diagram of a simple periscope.

1110.  The angle between the incident ray and the mirror is 30 ;

(a)    What is the angle of incidence?

(b)   What is the angle of reflection?

(c)    What is the total angle turned by the ray?

1211.  A bay with a mouth 5cm wide stands 2m from a plane mirror.

(a)    Where is his image? and

(b)   How wide is the image of his mouth?

(c)    He walks towards the mirror at 1m/s. At what speed does his image approach the mirror?

          

FORCES IN EQUILIBRIUM.

011.  (a) Define moment of a force.

            (b) A mechanic applies a force of 300N to un do a tight nut at a point on a spanner 

         which is 90cm from the nut. Calculate the moment of the force.

022.  Briefly explain the following:-

a)  A mechanic will choose a long spanner to un do a tight nut.

b)  A door handle is placed well away from the height.

c)  It is difficult to steer a bicycle by gripping the center of the handle bars.

d) A bus carrying heavy load on its top carrier can easily overturn.

033.  (a)State the conditions of equilibrium when a body is acted upon by a number of 

            parallel force.

b)  A uniform metal tube of length 5m and mass 9kg is suspended horizontally by two vertical wires attached at 50cm and 150cm respectively from the ends of the tube. Find the tensions in each wire.

044.  Explain what is meant by: 

(i)     Stable equilibrium

(ii)   Unstable equilibrium

(iii) Neutral equilibrium

           Give one example of each.

(b)The magnitude of moment of a force about a point is 1000Nm and the applied is 600N. find the perpendicular distance between the point and the line of action of the force.

055.  (a)State the principle of moments.

            (b) Define center of gravity of an object.

(c)A half meter rule is pivoted at 10cm mark and balanced horizontally when a 45g mass is hung from 1cm mark. If the rule is uniform; calculate its weight.

                            ( use: 1g mass = 0.01N

066.  Briefly explain the following:

a)      A Bunsen burner has a wide heavy base.

b)      Racing cars are low, with wheels wide apart.

c)      A boxer stands with his legs well apart.

077.  A uniform plank AB which is 6m long and has a weight of 300N is horizontally by two vertical  Ropes at A and B. A weight of 150N rests on the plank at C where AC =2m. Find the tension in each rope.


 

 

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