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MUSINGU HIGH SCHOOLDECEMBER HOLIDAY ASSIGNMENT

PHYSICS

FORM TWO OF 2013

1. What is meant by a virtual image?2. The fgure below shows an object O placed in ront o a plane mirror

On the same diagram draw rays to locate the position o the image 1 as

seen rom the eye !.

". #a$ %ive two main reasons why concave mirrors are unsuitable as drivingmirrors#b$ &tate one disadvantage o a conve' mirror as a driving mirror

(. !'plain why a concave mirror is suitable or use as a ma)e up mirror.*. +n the space provided below s)etch a labeled diagram to show how a pinhole

camera orms an image o a vertical object placed in ront o the pinhole#" mar)s$

,. - building standing 1m rom a pinhole camera produces on the screen o thecamera an image * cm high 1 cm behind the pinhole. /etermine the actual

height o the building.# " mar)s$1. Two isolated and insulated spheres - and 0 carry the same positivecharge. &)etch the electric lines o orce o their feld when placed close to eachother but not touching some.2. &tate the observation on the leaves o a positively charged electroscopewhen a negative charge is brought near it.

". &tate the precaution that is ta)en when charging a metal object.1. - student learnt that a battery o eight dry cells each 1.* has a total e.m.o 12 the same as a car battery. e connected in series eight new dry batteries tohis car but ound that they could not start the engine.

%ive a reason or this observation2. /istinguish between a primary cell and a secondary cell.". What current will a *3 resistor connected to a source o 2( draw?(. - current o .4- passes in a circuit or 2.* minutes. ow much chargepasses through a point in the circuit?*. +n large circuits large resistors in parallel are preerred to low resistors inseries. !'plain.,. &tate two advantages o an al)aline battery over a lead acid battery.5. - current o .*- 6ows in a circuit. /etermine the 7uantity o charge thatcrosses a point in ( minutes.4. !'plain why the bulb in fgure 1 #b$ will be brighter than each o thebulbs in fgure 1 #a$. #2 mar)s$8. %ive the reason why the cells in fgure 1 #b$ 9an be used or a longerperiod than the cells in :ig 1 #a$

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1.&tate the purpose o manganese dio'ide in a dry cell. #1 mar)$

11.- student wishes to investigate the relationship between current andvoltage or a certain device ;. +n the space provided draw a circuit diagramincluding two cells rheostat ammeter voltmeter and the device ; that would besuitable in obtaining the desired results. #1 mar)$12.&tate one advantage o an al)aline cell over a lead acid cell

#1 mar)$

1". +n the circuit diagram shown in fgure 5 the ammeter hasnegligible resistance. When the switch & is closed the ammeterreads .1"-. #" mar)s$

#a$ &tate Ohm

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DECEMBER HOLIDAY ASSIGNMENT

PHYSICS

FORM THREE OF 2013

1. /raw a'es and s)etch a graph o velocity #v versus time #t$ or uniormlyaccelerated motion given that when t A v is greater than Bero.

2. a$ The fgure below shows the displacement time graph o the motion o aparticle.

&tate the nature o the motion o the particle betweenC

i$ - and 0ii$ 0 and 9iii$ 9 and /

b$ - ball is thrown horiBontally rom the top o a vertical tower and stri)esthe ground at a point *m rom the bottom o the tower. %iven that theheight o the tower is (*m determine theD@i$ Time ta)en by the ball to hit the groundii$ +nitial horiBontal velocity o the ball.iii$ ertical velocity o the ball just beore stri)ing the ground. #Ta)e

acceleration due to gravity g as 1ms@2$". The graph bellows shows how the velocity varies with time or a body

thrown vertically upwards.

/etermine the total distance moved by the body. #"m)s$(. - bullet is fred horiBontally rom a platorm 1*m high. + the initial speed

is "ms@1 determine the ma'imum horiBontal distance covered by thebullet. #"m)s$

*. - helicopter which was ascending vertically at a steady velocity o 2mEs releaseda parcel that too) 2 second to reach the ground.i$ &tate the direction in which the parcel moved immediately it was released.ii$ 9alculate the time ta)en by the parcel to reach the ground rom the ma'imum

height.iii$ 9alculate the velocity o the parcel when it stri)es the ground.iv$ 9alculate the ma'imum height above the ground the parcel reached.

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v$ What was the height o the helicopter at the instant the parcel was dropped.,. - stone is thrown horiBontally rom a building that is * m high above a horiBontal

ground. The stone hits the ground at a point which is ,*m rom the oot o thebuilding. 9alculate the initial o the stone.

5 The diagram below shows a transparent water tan) containing water. -nelectric light is f'ed at corner - o the tan). - light ray rom the slitshines on the water surace 09 at an angle o (4as shown

a$ i$ /etermine the angle o reraction or the ray shown in thediagram.

ii$ 9omplete the diagram to show the reracted ray.b$ /etermine the angle o incidence or which the angle o reraction is 8

c$ 9alculate the speed o light in water #nw A (E" 9A " ' 14ms$4. The fgure shows the path o a yellow light through a glass prism. The

speed o yellow light in the prism is 1.44 ' 14 mEs.

a$ /etermine the reractive inde' o the prism material or the light. #&peedo light in vacuum A ". ' 14ms@1$

b$ &how on the fgure the critical angle 9 and determine the value.c$ %iven that rA 21.2 determine angle F.

d$ On the same fgure s)etch the path o the light ater stri)ing the prism ithe prism was replaced by another o similar shape but lower reractiveinde'. #Gse dotted line or your answer$.

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&)etch the path o the rays as it passes through the prism. 9ritical angleor water is (8 #1m)$

8. 9alculate the reractive inde' o glass given that the velocity o light in air is "'14ms@1and velocity o light in glass is 2.( ' 14ms@1.1.The real thic)ness o crown glass bloc) o reractive inde' 1.*4 is 1cm is 1cm.

9alculate the apparent thic)ness o the glass.11.Hou are provided with the ollowingD

@- *cm bea)er ull o water.@&tand and clangs@- hal metre rule@2 optical pins@9or)

a$ !'plain brie6y how you would determine the reraction inde' o water using thematerials provided.

b$ The data below shows the results obtained when such an e'periment was

perormed by orm three students using various values o real depths H o a li7uid.

=eal depth cm " * 5 8 11 1"-pparent depth

cm22 "5 *2 ,, 41 8,

i$ Ilot a graph o the real depth #y@a'is$ against apparent depth.ii$ :rom the graph determine the reractive inde' o the li7uid.

12.Iara>n has a greater reractive inde' than that o water. 9omment about therelative velocity o light in para>n and in water.

1".a$ &tate &!JJ

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FORM FOUR OF 2013

1. #a$ /efne the term angular velocity. #1m)$#b$ - body moving with uniorm angular velocity ound to have

covered an angular distance 15 radians in t seconds. Thirteenseconds later it is ound to have covered a total angular distance

o " radians. /etermine t #"m)s$#c$ :ig. 4 shows a body o mass m attached to the centre o rotatingtable with a string whose tension can be measure. #This device ormeasuring the tension is not shown in the fgure$.

The tension T on the string was measured or various values o angularvelocity

The distance r o the body rom the centre was maintained at "cm. Table 1shows the results obtained.

Table 1-ngular elocity #rads

@1$2. ". (. *. ,.

Tension T #$ .( ."( .5, 1." 1.8,#*m)s$

i$ Ilot the graph o T #y@a'is$ against W2

ii$ :rom the graph determine the mass m o the body given that TAmw2r@9 where 9 is a constant #(m)s$

iii$ /etermine the constant 9 and suggest what it represents in the setup.

#2m)s$2. -n object o mass *g 6oats with 2K o its volume above the water surace as

shown below. The tension in the string is .,.

a$ 9alculate the up thrust e'perienced by the object.b$ olume o water displaced.c$ The density o the objectd$ What would happen i the string was cut?". -rrange the ollowing radiations in order o increasing wavelengths.

Gltraviolet %amma =ays=adio Waves +nra =ed

( ame two types o electromagnetic radiations whose re7uencies aregreater than that o visible light.

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* a$ The ree ends o a coil are connected to a galvanometer. When thenorth pole o a magnet is moved towards the coil the pointerde6ects towards the coil the pointer de6ects towards the right asshown. &tate with reason the behaviour o the pointer in theollowing cases.

i$ The north pole o the magnet is held stationary near p.

ii$ The south pole o the magnet is made to approach the coilrom F.

c$ Two coils T and & are wound on a sot iron core as shown. T has

1 turns while & has , turns and resistance o 1

9alculate the ma'imum current measured by the ammeter.,. 9alculate the pea) value o an alternating current which has a root mean

s7uare value o ".-.5. - large sub station transormer is used to step down voltage rom

11 to (*.i$ /etermine the ratio o the turns in the primary to secondary coils.ii$ ow is the e>ciency o this transormer ensured?iii$ &tate one unction o the core in a transormer.

4. - generator produces a pea) voltage o 22v. What is the root means7uare value o this voltage?.

8. ame any two ways by which a transormer loses energy.