# FORM TWO CHEMBA PHYSICS MOCK EXAMINATIONS WITH ANSWERS | MTIHANI NA MAJIBU (MARKING SCHEME) YA MTIHANI WA MOCK PHYSICS WILAYA YA CHEMBA

THE UNITED REPUBLIC OF TANZANIA

THE PRESIDENT OFFICE REGIONAL ADMINISTRATION AND LOCAL GOVERNMENT

DODOMA REGIONAL FORM TWO MOCK EXAMINATION

PHYSICS

CODE: 031                                                                                                                                              TIME 2:30 HRS

INSTRUCTIONS

1.      This paper consists of section A, B and C

2.      Answer ALL questions in all sections A, B and C in the space provided only.

3.      Show your work clearly and systematically

4.

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Use the following constants

Density of water 1000kg/m3 or 1g/m3

Accelaration due to gravity 10N/Kg

 FOR EXAMINERS' USE ONLY QUESTION NUMBER SCORE EXAMINER'S INITIAL 1 2 3 4 5 6 7 8 9 10 TOTAL

SECTION A (30 MARKS)

Answer all Question in this section

1. Write the letter of the correct answer in the box provided for each of the item

i.          The area under the velocity time graph represent

A.    Speed

B.    Velocity

C.    Distance

D.Displacement

ii.          Action and reaction are equal but acting in opposite direction represent

A.    Newton’s first law of motion

B.    Newton’s second law of motion

C.    Newton’s third law of motion

D.    laws of friction

iii.      A force  exerted by a pressure of 20N/m2   acting over an Area  of 2m2 is…

a.10N

b. 18N

c. 22N

d. 40N

iv.             Swelling of soaked beans in water is demonstration is

a.      capillarity

b.     Diffusion

c.      Osmosis

d.     viscosity

v.               The surest way of testing charge is

a.      induction

b.     attraction

c.      repulsion

d.     stroking

vi.             An instrument which is used to observe object around obstacles is called

a.      microscope

b.     periscope

c.      plane glass

d.     telescope

vii.           Ohm is the SI unit of

a.      conductance

b.     resistance

c.      electric potential

d.     Potential difference

viii.         One of the following is not pair of force

a.      attraction and repulsion

b.     gravity and diffusion

c.      torsional and gravity

d.     upthrust and weight

ix.                A boy weighing 45kg climbs up a stair case to a height of 7M in 5seconds.

The amount of work done by the boy is…

a. 70J

b. 450J

c. 105J

d. 3150J

x.               The sun is an example of luminous body because it

a.      is a big star

c.      produces its own light

d.     Its own light

xi.             A smell of rotten body can be felt by process of

a.      Diffusion

b.     Evaporation

c.      osmosis

d.     Transpiration

xii.           The following are the application of magnetism in daily life EXCEPT

a.      banks made use of magnetic ink or parked

b.     flour is passed near a magnet before being parked

c.      magnet are used to separate sand from glass

d.     VHS tapes are manufactured as a result of magnetism

xiii.         An object with low centre of gravity and wide base

a.      neutral

b.     stable

c.      equilibrium

d.     unstable

xiv.          Penumbra is

c.      moon

xv. A potential  difference of 12V is applied across a resistor of resistance  24Î©

The current in a circuit is………

a. 0. A

b. 2A

xvi.   When a bus is moving with constant velocity then its acceleration is

a.      Constant

b.     Zero

c.      minimum

d.     maximum

xvii.        Best test for magnetized material is

a.      friction

b.     hammering

c.      repulsion

d.     heating

xviii.      The SI unit of electric charge is

a.      ampere

b.     coulomb

c.      ohm

d.     second

xix.          The material which allow electricity and heat to pass freely are termed as

a.      conductors

b.     insulator

c.      semiconductor

d.     semi insulator

xx.  which of the following group of instruments is used to measure the basic fundamental quantities

a.      beam balance, stop watch, and vernier caliper

b.     chemical change, stop watch and measuring cylinder

c.      measuring cylinder, beam balance and metre rule

d.     spring balance, stop watch and micrometer screw gauge

2. Match the items in Liat A with those in List B by writing a

letter of a correct response below the corresponding item number in the table provided.

 LIST A LIST B (i) Store charge A. Repel  B. Attract (ii) C= C1 +C2 C. Capacitor in series  D. Capacitor in parallel (iii) Glass E. Insulator F.Gold leaf (iv) Similar charges G. Capacitor (v) Detect charges I. Metal cap

 Liat A I Ii iii iv v List B

3. Complete each of the following statement by writing the

correct answer in the space provide

i) The quantity of space that an object occupies is knows as   ………………

ii) Occur when a  rate of change of displacement is constant ……………………

iii) A physical quantity measured by using thermometer is referred to as ………

iv) The turning effect of the force about the point is…………………………

V) Angle between the magnetic and geographical meridians is called…………

SECTION B (50 marks)

Answer all question in this section

4 (a)(i) Archimedes principle state that

………………………………………………………

(ii)Law of floatation state that …………………

(ii) Apparent weight is ……………………………………………

(iii)Apparent loss in weight is …………………………………

4 (c) A body has mass of 12N in air.

When is immersed in water its weight is reduced by 4N. Calculate

(i) Apparent weight ………………………………………………………

(iii) Density of the Body ……………………………………………

5. (a) pressure is ………………………………………………………

(b) Pascal principle states that …………………………………………

(c) Why is easier to cut meat by using sharp knife edge? ………………………………………………………………………

(d) A rectangular object whose dimension are 1.4m by 0.1m by 0.2m

has a density of 200kg/m3 .

Calculate their i) minimum pressure when placed on table

ii) maximum pressure when placed on table

6. (a) Three characteristics of the image formed by plane mirrors are

(i)………………………………………………………………………

(ii)…………………………………………………………………

(iii)………………………………………………………………

(b) The laws of reflection are

(i)…………………………………………………………

(ii)…………………………………………………………

(c)  Five (5) Images are formed by two plane mirrors.

(i) Calculate the angle  between two mirrors.

(ii) How many images formed when the two plane mirrors

are set parallel to each other.

7  (a) The law of conservation of energy states that ………………………………………………………………

(i) Power ……………………………………………………

(ii) Kinetic energy is ………………………………………

(iii) potential energy is ……………………………………

(iv) Work done is …………………………………………………………

(c)  The body of mass of 20 kg is moving with a velocity of 4m/s.

Calculate the kinetic energy of the body.

(d) An object of mass 100kg is lifted to a height of 5m

above the ground in 3seconds.

Calculate

(i)  Work done

(ii) Power

8.  (a) The two condition for a body to be in equilibrium are

(i) …………………………………………………………

(ii)……………………………………………………………

(b)  (i) centre of mass……………………………………………

(ii) centre of gravity ……………………………………

(c) A uniform metre rule is balanced horizontally on a knife

edge placed 5cm from

B with a mass of    60g at B. Find the mass of the ruler.

SECTION C: (20 marks)

Answer all question in this section

9. (a) define the following terms

(i) Simple machine ………………………………………………

(iii) Velocity ration …………………………………………………

(iv)Efficiency of machine ………………………………………………………

(b) The load of 600N moved a distance of 4m when lifted

by an effort of 300N

when moved a distance of 10 cm. calculate

(ii) Velocity ratio …………………………………………

(iii) Efficiency …………………………………………………………

(c) Mention any two  factors which affect the efficiency of machine ……

10. (a) Define the following terms

(i) Current ………………………………………

(ii) Potential difference ……………………

(iii) Resistance ……………………………

(b) State Ohms law .......

(c) two resistors of resistance 4 ohm  and 6 ohm are arranged ni

(i) parallel

(ii) series

Calculate the total current flowing if the resistors are connected

in circuit with potential difference of 40 V in each case above.

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THE UNITED REPUBLIC OF TANZANIA

THE PRESIDENT OFFICE REGIONAL ADMINISTRATION AND LOCAL GOVERNMENT

DODOMA REGIONAL FORM TWO MOCK EXAMINATION

PHYSICS MARKING SCHEME

SECTIONA(30Marks)

1.

 I II III IV V VI VII VIII IX X XI XII XIII XIV XV XVI XVII XVIII XIX XX C C D C C B B B D C A C B B A B C B A A

01mark@mark2.

2.

 I Ii iii iv v G D E A F

01mark@5marks

 3. (i) Volume (ii) Uniformvelocity (iii) Temperature (iv) Moment (v) Angleofdeclination                01mark@5marks 4. (a)totallyweight (i)       Archimedes’principlestate’sthat “Whenthebodyispartiallyor  immersedinliquiditexperiencesanupthrustwhichisequaltothe ofliquiddisplaced.          02marks own (ii)          Lawoffloatationstatesthat“Thefloatingobjectsdisplacesitsweight.(01mark) (b) (i)       Upthrustisanupwardforcethatactsonanobjecttotallyor

partially                           immersedin fluid(liquidor gas)                     01mark

(ii)             Apparentweightistheweightofanobjectwhenitisinfluid.

01mark

•  (iii)           Apparentlossinweightisthedifferencebetweentheweightofthe body inair(Realweight)andtheweightofthebody
• whenitisinafluid
• (Apparentweight)                                                            01mark (iv)            Realweightistheweightofanobjectwhenitisinair.01mark
• 4.                (c)      DataRealweight=12NUpthrust=4N(i)
•   Apparentweight=12N–4N = 8N               01mark(ii)
•    Relativedensity
•      =   =

• =        3                  01mark(iii)           Densityofthebody=
•  R.dxdensityofwater=        3x1000kg/m3 =3g/cm3

1mark

5.                (a)      Pressureisdefinedasforceacting

normallyperunitArea.          01mark

(b)             Pascal principle states that “Any external

pressure applied to thesurface of anenclosed liquid

will be transmitted equally throughout theliquid.2marks

(c)              Because pressure is inversely proportional to

the area, thus becausesherp knife

edges have small

areas then the pressure is very

high”hencetheforce.2marks

(d)

1.4                                                                01mark

A1=1.4x0.1m2=0.14m2A2=1.4x0.2m2

=0.28m2A3=0.1x0.2=0.02m2

Volume=0.1x0.2x1.4=0.028m3                                                                           01markDensity=200kg/m3                                                            01markF=ma=pva=0.028x200x10N=56N.

(i)               Minimumpressure ==N/m201markMinimumpressure=200N/m2

(ii)             Maximumpressure==N/m2Maximumpressure2800N/m2                                                            01mark

6.                (a)      (i)       Virtualimage                                           01mark

(ii)             Imagehasthesamesizeastheobject                   01mark

(iii)           Imagedistancebehindthemirroristhesameastheobjectinfrontofthe mirror.                                                                                01mark

(b)             (i)          Thedegreemeasureofanincidenceangleisequaltothedegreemeasure                    ofangleofreflection.          01mark

(ii)

Theincidenceray,thereflectedrayand

thenormalalllieonthesameplane.

01mark

(c)              (i)       Date

n=5images

q=?

q=60o

(ii)      Whenthemirrorareparallelthat
q=0o              01mark

infiniteimages

7.                (a)       Thelawcnservationofenergystatesthat

“Energyisnevercreatedordestroyedbutcan betransformed

fromoneformto another.

02marks

(b)      (i)       Poweristherateofdoingworkoris

theworkdoneperunittime.

1mark

(ii)             Kinetic energy is half the product

of an objects mass and thesquareofspeedorvelocity.

Isenergyprocessedduetomotion?01mark

(iiPotentialenergyistheprojectofanobjectsmass,acceleration duetogravityandanobjectsheight.

(iv)            Workdoneistheproductofforceanddistancemovedbyforce.

7.       (c)      Data

m =20kgv=4m/s

k.e.=?

k.e=01mark

k.e=

k.e=60J                                      02mars

(d)             Data

m = 100kgh=5mg=10m/s2t=3seconds

(i)               Workdone = P.e = mghWorkdone=100x10x5J

Workdone =5000J                       01mark

(ii)           Power=

Power=

Power=1666.7watts

 8. forces. (a) (i) Sumofupwardisequaltosumofdownwardforcesforparallel 01mark (ii) Sumofclockwisemomentsisequaltothesumofanticlockwisemoments. (b) Centre ofmassisthepointatwhichthe (i) Systemofparticlesforminguptheobjectappeartobeconcentrated.01mark (ii) Centreofgravityisthepointwheretheforceofgravitycanbeconsideredtoact.                                                            01mark 8. (c)

A                               100cm                                     B

95cm50cm

50m

mR

m=60g

MRx45=60x05

01mark

MR=01mark

MasoftheRuleris6.7g.                01marksSECTIONC

 9. (a) (i) Simplemachineisanydevicethatrequirestheapplicationsof single forcetodowork.                                                            01mark

(iii)           Velocityratioistheratioofdistancemovedbyefforttothe

01mark

(iv)            Efficiency of machine is the ratio of

M.A to V.R

times hundredpercentoristheratioofworkoutputtotheworkingputtime

shundredpercent.01mark

(b)             DataL=600NLd = 4cmE = 300NEd=10cm

(i)               M.A =01mark

(ii)             V.R=01mark

(iii)                                                   01mark

01mark

9.                (c)      Thefactorswhichaffectefficiencyofmachinesare:

(i)               Airresistance                              01mark

(ii)             Friction                            01mark

10.              (a)      (i)          Currentisafundamentalquantityandistheamo

untofchargeagiven

the

pointinacircuitdividedbythetimerequiredforthepassageof

charge.          OR

Istherateofslowofchange                                 01mark

(ii)             Potentialdifferenceistheproductofthe

currentandresistanceinagiven circuitorcomplete

path ofan electriccurrent. ORWorkdoneperunitcharge(01mark)

(iii)           Resistanceisp.dacrosstheconductorperunitcurrentthroughtheconductor.                                                  01mark

(b)             Ohmsstatesthat“Atconstant

temperatureandotherphysicalfactors, a

current passing through a wire

(conductor) is

proportional to thepotentialdifferenceacrossitsends.

(c)              Data

R1=4WR2=6W

(i)               Parallel

4L

40V

R
T=2.4W                       ½mark

I=16.67A

10.     (c)      (ii)      Series              4W                 6W

RT=R1+R2

RT=4W+6W

RT=10W

I=

I=4A

...

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