paper-2 set b (final)

8/17/2019 paper-2 set B (Final)

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1 A parachutist jumps from an aircraft. Some time later, the parachute opens. Fig. 1.1 is a graph of the vertical speed of the parachutist plotted against timet.

Fig. 1.1 (a) State what happens at t = 20 s and t = 55 s.

at 20

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at 55

s .......................................................................................................................

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[1] (b) escri!e the motion of the parachutist !etween t = 0 and t = 20 s.

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[2](c) "#plain, in terms of the forces acting, wh$ the speed of the parachutistis constant

!etween t = 25 s and t = 55 s.................................................................................................................

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[2] (d) %alculate the distance travelled !$ the parachutist !etween t = 25 sand t = 55 s.


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distance = ................................................ [2]


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2 Fig. 2.1 shows a !oat stationar$ in still water in a narrow tunnel.

Fig. 2.1

&o move the !oat, two men lie on the top of it and push against thetunnel roof with their legs

&he$ e#ert a total forwards force of 1'(0 ) on the !oat.

(a) &he men push the !oat 50.0 m to the end of the tunnel. %alculatethe wor* doneon the !oat !$ the men.

wor* done = ..................................................[2]

+! "#plain wh$ the *inetic energ$ of the !oat at the end of the tunnelis less than

the wor* done on the !oat !$ the men............................................................................................................................

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[2]


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3 Fig. -.1 shows a weather !alloon. &he !alloon is shown partl$ lled with gasfrom a c$linder.

Fig. 3.1 &he !alloon contains no gas initiall$. /hen it is connected to the c$linder, gasenters the!alloon. &he pressure in the c$linder decreases.

(a) "#plain wh$ the molecules inside the c$linder(i) e#ert a large pressure initiall$,

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(ii) e#ert a smaller pressure in the c$linder when the !alloon is lled..................................................................................................................

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(b) &he volume of the c$linder is 0.0020m-. &he pressure inside thec$linder is initiall$ 200 atmospheres. /hen the c$linder is connected tothe !alloon, the nal pressure in the c$linder and the !alloon is 1.0atmosphere.

&he temperature of the gas remains constant.

%alculate the nal volume of gas in the !alloon. State the euation that

$ou use.


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volume = ..............................................[3]


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4 iuid air contains a mi#ture of o#$gen and nitrogen.&he !oiling point of

nitrogen is 13' 4% and the !oiling point of o#$gen is 1(- 4%. A sample of

liuid air in a !ea*er is allowed to warm up slowl$. Fig. .1 shows how the

reading of a thermometer in the !ea*er varies with time t.

Fig. .1

(a) escri!e the two changes of state that occur and state when the$occur.

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[3] (b) &he liuid air contains 200 g of liuid o#$gen and (00 g of liuid

nitrogen. &he specic heat capacit$ of liuid o#$gen is 1.6 7 8 +g 4% and thespecic heat capacit$ of liuid nitrogen is 2.0 7 8 +g 4%.

%alculate the thermal energ$ needed to warm the liuid from 205 4%to 913' 4%.

State the formula that $ou use in $our calculation.


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energ$ = ................................................ [4]


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5 Fig. 5.1 is drawn full scale. &he focal length of the lens is -.0 cm.

Fig. 5.1(a) :n Fig. 5.1, draw two ra$s from the top of the o!ject : that meet at the

image.

[2](b) (i) ene the term linear magnifcation..................................................................................................................

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(ii) etermine the magnication produced !$ the lens in Fig. 5.1.

magnication = ................................................ [1]

(c) Fig. 5.2 shows a normal e$e viewing an o!ject close to it. Fig. 5.- is along;sighted e$e viewing an o!ject at the same distance.

Fig. 5.2 Fig. 5.3%omplete Fig. 5.- to show the ra$s travelling through the e$e.

[1]


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6 Fig. '.1 shows a coil of wire wound on a card!oard tu!e. &here is a d.c. current in the coil. &he direction of the current is shown in the

*e$.

Fig. 6.1(a) :n Fig. '.1, draw the magnetic eld produced !$ the coil.

[3](b) Fig. '.2 shows a simple loudspea*er that uses the coil shown in Fig. '.1attached to a

paper cone.

Fig. 6.2 &he coil is connected to a signal generator. &here is an alternating current of freuenc$ 100


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[3]


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7 Fig. 6.1 shows an electrical circuit.

Fig. 7.1(a) :n Fig. 6.1, draw an arrow at A to show the direction of >ow of theelectrons in the ? wire.

[1]

(b) State and e#plain how the potential di@erence across varies as the

light shining on it !ecomes !righter..................................................................................................................

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[2]8 A radioactive roc* emits gamma;ra$s. A teacher plans an e#periment to showa class that

the emission of gamma;ra$s from the roc* is random in time.

(a) (i) State the apparatus that the teacher needs to detect the gamma;ra$s.

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(ii) State one safet$ precaution that the teacher must ta*e..................................................................................................................

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(iii) escri!e how the e#periment is performed.


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(b) escri!e what is meant !$ a gamma;ra$.................................................................................................................

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9 Fig. 3.1 shows how the currents in a lamp and in a wire / var$ with thepotential di@erence +p.d. applied.

Fig. 9.1(a) (i) raw a diagram of the circuit that $ou would use to ta*e the

readings of current and p.d. for the lamp. State the range $ou wouldchoose for the voltmeter.

[5](ii) escri!e how the resistance of the lamp varies as the p.d.

increases.[1]

(b) (i) Fig. 3.2 shows the lamp and the wire / connected in series. &hecurrent in the circuit is 0.( A.

Fig. 9.2etermine, using the graph or !$ calculation,1. the p.d. across ,


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2. the p.d. across /,-. the p.d. of the suppl$,. the resistance of the lamp in Fig. 3.2.

[5](ii) Fig. 3.- shows the lamp and wire connected in parallel.A p.d. of 12 B is connected across them.

Fig. 9.3etermine, using the graph or !$ calculation,1. the current C/ in the wire /,2. the current C in the lamp ,-. the total current C in the circuit,

. the resistance of the wire /.[4]


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paper-2 set b (final)

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