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ANSWER

1

(a) (i) Mass of the load, m(ii) Extension of the spring,I(iii) Diameter of the spring, type of the

spring.

m/kg I/cm y 1. - I/cm,

0 10.0 0

0.5 9.0 1.0

1.0 8.2 1.8

1.5 7.0 3.0

2.0 5.8 4.2

2.5 4.9 5.1

(d)y is directly proportional to m

YMM

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2 (a) (i) V reduces as Iincreases.

V= 1.5 V when I = 0.0 A(iii) Electromotive force, e.m.f

(d) The connection to the circuit must be neatand tidy, also avoid parallax error.

Section B

1 (a) Inference

The velocity of the swing increases if theheight from which it is released increases,

(b) Hypothesis:As the height of release of the swingincreases, the velocity of the swingincreases.

(c) Aim of the experiment:

To determine the relationship between theheight, h with the velocity, v for a trolley,Variables in the experiment:Manipulated variable:

The height of the trolley, hResponding variable:Velocity of the trolley, v

Constant variable:The inclination of the track plane and massof the trolley and the power supply.Apparatus and materials:

Wooden blocks of the same size, ticker-timer,trolley, ticker tape, wooden track and a powersupply.

Arrangement of apparatus:

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Procedure:

The apparatus is arranged as shown in thefigure. An inclined track is prepared and theticker-timer is placed at the edge of thetrolley. The trolley is then placed on theinclined track at a height ofh = 10 cm fromthe surface of the table. The power switch isswitched on and the trolley released so thatit rolls down the track. The power switch isswitched off as soon as the trolley reachesthe edge of the track. Based on the tickertape reading, the velocity of the trolley iscalculated, taking into consideration thelast 10 dots. This experiment isrepeated using values of h = 15.0 cm,20.0 cm, 25.0 cm and 30.0 cm. Thecorresponding values for v for every value ofh is calculated. The data is tabulated as

h/cm v/cm s-1

10.0

15.0

20.0

25.0

30.0

A graph of velocity, v against h is plotted.

From the graph, it is concluded that thevelocity, v increases as the height, hincreases.

2 (a) Inference:

The velocity of the sea waves changeswhen the waves approach an area which isshallow.

(b) Hypothesis:

The velocity of the refracted waves issmaller than the velocity of the incidentwaves.

(c) Aim of the experiment:To study the relationship between thevelocity of refracted waves with thevelocity of incident waves.

Variables in theexperiment: Manipulatedvariable:

Depth of water.Responding variable:

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Apparatus and materials:

Power source, ripple tank, a transpare-plate, stroboscope, a piece of whitemeter rule, wooden bar fitted w-.-vibrator motor.

Arrangement of the apparatus:

Procedure:

The transparent plate is placed at the edgof the ripple tank so that water on top of itsurface is the region of shallow water. Thimage of the plane waves in the region of deewater and shallow water is observed thronga stroboscope that freezes the propagation (the waves. Using a metre rule, thwavelength of the wave in the deep regioand the shallow water region is measure(Experiment is repeated by increasing thdepth of the water.

Results of the experiment:

Depth of shallow water region

The wavelength of water in the deep- waterregion is higher as compared to thewavelength of water in shallow water region.