Class 9 Final

8/17/2019 Class 9 Final

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ASTP

Class TestClass-9

Topic: Electricity

Teacher: Jahangir MasudTime: 1hour Total:40

Name:

atch:

School:

MCQ

1 The diagram sho!s a positi"ely charged acetate strip and a negati"ely charged polythene stripthat are #reely suspended$

T!o rods % and & are 'rought up in turn to these t!o strips$ (od % attracts the acetate strip 'ut

repels the polythene strip$ (od & does not repel either the acetate strip or the polythene strip$

)hich type o# charge is on each rod*

2 A cell is connected to a resistor$)hat is the e$m$#$ o# the cell e+ual to*

A The potential di##erence across the resistor #or each unit o# current$

The po!er produced in the circuit #or each unit o# charge that passes$C The !or, done in the circuit #or each unit o# charge that passes$

- The !or, done in the circuit #or each unit o# current$3 A cell is connected in series !ith an ammeter and a lamp$ The current is 1 A$

.n !hich circuit/ using identical cells/ lamps and ammeters/ is the current reading A*

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4 )hich circuit contains a cell/ a lightemitting diode and a #i2ed resistor*

5 .n each o# the circuits 'elo!/ a short circuit occurs$.n !hich circuit !ould the #use 'lo! and ma,e the circuit sa#e to repair*

6 The diagram sho!s some o# the important parts o# the tu'e o# a cathoderay oscilloscope$

)hich change in "oltage results in the position o# the spot on the screen mo"ing to!ards the top*

A decreasing 31 decreasing 3C increasing 3- increasing 3

7 5n a stormy day/ a large/ positi"elycharged cloud is a'o"e a tree$

An electrical charge is induced on the tree as charged particles #lo! through it$

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)hat is the charge induced on the tree and ho! do the charged particles mo"e*

8 The diagram sho!s t!o resistors connected in series !ith a cell$

)hich statement de#ines the potential di##erence across %&*

A the po!er needed to dri"e a unit charge through the cell the po!er needed to dri"e a unit charge 'et!een % and &

C the !or, done in dri"ing a unit charge through the cell- the !or, done in dri"ing a unit charge 'et!een % and &

9 )hich t!o resistor com'inations ha"e the same resistance 'et!een % and &*

A P and 6 P and S

C 6 and ( - ( and S

10 .n order to turn o## 'oth lamps/ !hich is the sa#est s!itch position*

11 A "aria'le potential di"ider has a sliding contact S that can 'e mo"ed 'et!een end P and end 6$.t is connected to a constant 7 3 po!er supply/ as sho!n 'elo!$

)hat happens to the p$d$ 'et!een % and & as S mo"es do!n #rom P to 6*

A .t decreases gradually #rom 7 3 to 0 3$

.t rises gradually #rom 0 3 to 7 3$

C .t stays constant at 0 3$- .t stays constant at 7 3$

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12 A capacitor C charges !hen it is connected to a d$c$ po!er supply$

)hich arro!s sho! the direction o# the con"entional current !hen the capacitor is charging*

A 1 and 1 and 4 C and - and 4

13 )hich diagram correctly sho!s the electric #ield 'et!een t!o charged spheres*

14 An electrical +uantity is de#ined as 8the energy con"erted 'y a source in dri"ing a unit chargeround a complete circuit$9

)hat is this +uantity called*A currentB electromoti"e #orceC potential di##erenceD po!er

15 The diagram sho!s an electric circuit$

)hich pair o# readings is o'tained !hen a suita'le po!er supply is connected 'et!een X and Y*

16 The diagram sho!s part o# an electric circuit$

)hat is the current in the resistor*A 0$7 A B 1$ A C $0 A D 7$0 A

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17 An electric heater consists o# a heating element mounted on a metal re#lector$ The re#lector is

connected to earth$

)here should the s!itch #or the heating element 'e connected*A 'et!een the earth !ire and the re#lector B 'et!een the li"e !ire and the heating elementC 'et!een the li"e !ire and the neutral !ireD 'et!een the neutral !ire and the heating element

18 Each o# the diagrams 'elo! is a crosssection through t!o parallel currentcarrying conductors$

)hich diagram correctly sho!s the magnetic #ield pattern #ormed 'y the currents in the t!o conductors*

19 The electric circuit sho!n is used to study the charging o# capacitor C$

The neon lamp lights !hen the p$d$ across the capacitor C reaches 110 3$ The capacitor C then

discharges/ the lamp goes out and the p$d$ across C slo!ly increases once more$

)hat is the e##ect o# increasing the resistance o# (*A The lamp lights up and goes out at the same rate$B The lamp lights up and goes out less #re+uently$C The lamp lights up and goes out more #re+uently$D The lamp !ill not go out at all$

20 To charge an isolated metal sphere 'y induction/ the #ollo!ing #our processes are re+uired$

P The sphere is earthed 'y touching it$

6 The earth connection is remo"ed #rom the sphere$( A charged rod is 'rought close to the sphere$

S The charged rod is remo"ed$

.n !hich order can these stages 'e carried out to charge the isolated metal sphere*A P ; 6 ; ( ; SB P ; ( ; S ; 6C ( ; P ; 6 ; SD ( ; P ; S ; 6

21 The potential di##erence 3$

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?o! much charge passes through the 10 resistor in 0 seconds*

A C 1> C C 70 C - 1>00 C

22 )hich changes 'oth cause a decrease in the resistance o# a copper !ire*

23 The diagram sho!s a circuit$

)hat is the reading on the ammeter !hen the s!itch is open/ and the reading !hen it is closed*

24 The diagram sho!s a circuit$

The lamp is a 1 ) lamp and is !or,ing at normal 'rightness$

)hat are the readings on the meters*

25 A lamp rated 7 3/ A is s!itched on #or 70 s$

?o! much energy is used*A 0$ J 0 J C 1@0 J - 0 J

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Structured Questi!

26 Big$ 7$1 sho!s an electrical circuit$

"i#$ 26$1

%a& 5n Big$ 7$1/ dra! an arro! at A to sho! the direction o# #lo! o# the electrons in the !ire$

1%'& )hat is the name o# component %*

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%c& State and e2plain ho! the potential di##erence across % "aries as the light shining on it 'ecomes 'righter$

$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$

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27 Three cells are connected in series ma,ing a 'attery/ as sho!n in Big$ $1$ The e$m$#$ o# each cell is 1$> 3$ A resistance o# 1> is

connected to the 'attery$

"i#$ 27$1

%a& )hat is the total e$m$#$ o# the 'attery*$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$

1%'& Calculate the current in the circuit$

State the e+uation that you use$

current F $$$$$$$$$$$$$$$$$$$$$$$$$$$$$

%c& A 'attery can 'e made #rom cells connected in parallel/ as sho!n in Big$ $$

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"i#$ 27$2

State one ad"antage o# connecting the cells in parallel$

$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$

$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$

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27 %a& A 1>00 resistor is used on an electronic circuit 'oard in a tele"ision$

Big$ $1 sho!s the 'ands on a resistor$

"i#$ 27$2

The ta'le o# Big$ $ sho!s the colour code #or the 'ands$%i& State the colours o# the 'ands on a 1>00 resistor$

'and 1 $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$

'and $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$

'and $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$

%ii& -etermine the ma2imum "alue o# resistance that can 'e sho!n !ith this three'and colour code$

resistance F $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$1

%'& Big$ $ sho!s part o# a circuit that includes a "aria'le resistor ( and a 'attery o# e$m$#$ G$0 3$

"i#$ 27$3

%i& State one similarity and one di##erence 'et!een electromoti"e #orce

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Class 9 Final