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Sulit System

1. Diagram 1 shows an aero plane flying horizontally with a constant velocity. P and Q are

two forces which maintain the aero plane at constant altitude.

(a). Name the forces P and Q.

P: ...

Q: ..

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($). %rite e&uation to show the relationship $etween P and Q.

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2. ' su$stance with mass .* +g is heated $y using a heater 1 %. Diagram shows graph

temperature against mass for the su$stance.

(a). %hat is the time ta+en $y su$stance to achieve melting point ,

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($). -ased on information on graph find specific latent heat for the su$stance .

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(c). -y using +inetic theory e/plain why there is no increase in temperature at Q0.

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8. Diagram shows an o$2ect 3 with height " cm placed on the left side of a conve/ lens

. 4he focal length of the conve/ lens is 1 cm.

(a) 5n Diagram draw the ray path from the o$2ect to form an image.

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($) 6tate the characteristics of the image formed.

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(c) 5f the o$2ect is placed at a distance 7 cm from the lens calculate:

(i) the image distance.

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.

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(ii) 8inear magnification.

.

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2 ' fi/ed amount of dry gas is e/erting a pressure on its container.

 (a) 5n terms of molecules e/plain what causes the pressure.

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 ($) 3ne of the s+etch graphs in 9ig. ".1 shows how the pressure of the gas varies with volume

at constant temperature and the other shows how the pressure varies with temperature at

constant volume.

  4he pressure a/is has $een la$elled in each case.

9ig. ".1

 (i) 3n the appropriate graphs la$el one horizontal a/is volume ; m7 < and the other horizontal

a/is temperature ; =>

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threads as shown in 9ig. ?.1.

  ' is given a positive charge and - is given a negative charge.

  3n 9ig. ?.1 draw how the threads and spheres might loo+ after the spheres have $een

charged.

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 ($) ' cleaner is attempting to remove dust from some plastic@covered furniture using a dry cloth.

Anfortunately this seems to ma+e the dust cling more firmly to the plastic covering.

  (i) 6uggest why this happens.

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(ii) 6uggest why this would $e less li+ely to happen if the cleaner used a cloth which was

very slightly damp.

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10 ' sportsman is feared to have $ro+en a leg and is ta+en to hospital to have his leg @rayed.

 (a) >omplete the following sentence a$out @rays.

  @rays are a form of ..................................................... radiation that have

very ...................................... wavelengths.

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 ($) 5n the hospital what is used to detect the @rays and produce an image of the $ones of the

leg,

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 (c) Descri$e the properties of @rays that ena$le an image to $e produced which distinguishes

 $etween $ones and flesh.

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 (d) 6tate one precaution ta+en $y the technicians who operate the @ray machines.

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11 9ig. 11.1 shows a tu$e for producing cathode rays connected to two voltage supplies and

switches.

9ig. 11.1

 (a) %hich switch has to $e closed in order to ma+e the filament release electrons,

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 ($) (i) B/plain why closing the switch in (a) ma+es the filament release electrons.

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  (ii) %hat name do we give to this means of electron release,

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 (c) 6tate and e/plain what will happen to the released electrons when $oth switches are closed.

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2 6ome $uilders decide to measure their personal power ratings using apparatus they already have

on site. 9ig. ".1 shows the arrangement they use.

9ig. ".1

 (a) 5n the ta$le $elow list the three &uantities they must measure in order to calculate one mans

 power and the instrument they would use for each measurement.

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 ($) 3ne wor+man is measured as having a power of *" %. Eis weight is N.

  Ee can develop the same power clim$ing a ladder whose rungs are 7 cm apart.

  Eow many rungs can he clim$ in * s,

num$er of rungs F ...........................................................

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(c) 4he human $ody is only a$out 1*G efficient when clim$ing ladders.

  >alculate the actual energy used from the $ody of the wor+man in ($) when he clim$s " rungs.

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 energy used F ........................................................... !"#

Mark Scheme

5  4he manufacturers la$el on an electric heater is as shown in 9ig. *.1.

9ig. *.1

 (a) 6tate what electrical &uantity is represented $y

  (i) 11 H ............................................................................................................

  (ii) I Ez ............................................................................................................

  (iii) 1 +%. ............................................................................................................

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 ($) (i) %hich part of the electric heater must $e earthed,

  .......................................................................................................................................

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  (ii) B/plain what the hazard might $e if the heater is not earthed.

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  .......................................................................................................................................

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 (c) 4he heater has two 11 H heating elements with two switches so that either one or $oth

elements may $e switched on.

  5n the space $elow draw a circuit diagram showing how the heating elements and switches

are connected to the mains supply.

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9  ' simple motor is made in a school la$oratory. ' coil of wire is mounted on an a/le $etween the

 poles of a horseshoe magnet as illustrated in 9ig. J.1.

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9ig. J.1

 (a) 't the instant illustrated in 9ig. J.1 the coil '->D is horizontal and the $attery is connected as shown.

  (i) 9or this position state the direction of the force on '- and the direction of the motion of '-.

force on '- ........................................................................................................................

direction of motion of '- ...............................................................................................

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  (ii) B/plain why -> does not contri$ute to the turning force on the coil.

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($) 't the instant when the coil is vertical the springy contacts do not in fact ma+e contact with

the ends of the coil.

  Descri$e and e/plain what happens to the coil.

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 (c) 4he motor in 9ig. J.1 does not rotate very &uic+ly. 4he designer of a commercial motor is

re&uired to produce a faster@rotating motor.

  6uggest one change that could $e made to increase the speed of the motor.

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10 (a) ' cathode@ray oscilloscope ma+es use of the process +nown as thermionic emission.

  Descri$e what happens during this process.

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 ($) 5n the space $elow draw a la$elled diagram of a cathode@ray oscilloscope.

  5nclude in your diagram the tu$e the cathode the accelerating anode the focusing anode

and $oth @ and K@plates. Do not attempt to show any e/ternal circuits.

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 (c) ' cathode ray is a $eam of electrons.

  6uggest one way of controlling the num$er of electrons in the $eam.

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(d) 3ne cathode@ray tu$e has * H $etween the accelerating anode and the cathode.

  4he $eam of electrons carries a total charge of .J* > in *. s.

  >alculate

  (i) the current caused $y the $eam

 current F ...........................................................

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  (ii) the energy transferred $y the $eam in " s.

energy F ...........................................................

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