FORM2.TEST13

FORM 2 SCIENCE TEST 13

1. Figure 1 shows a lever in equilibrium. P and Q are objects weighing 100 N and 200 N.

Figure 1

(a) Label the fulcrum for the figure 4 above.

(b) What will happen if object P is shifted towards the fulcrum ?

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(c) What must be done to object Q to make the lever in equilibrium again ?

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(d) Find the value of Y if the value of X is 3 metre.

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(e) Figure 2 shows the use of a lever to lift an object.

Figure 2

FORM 2.TEST 13Dean’s 11.09.2005

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X metre Y metre

Effort

Load

Fulcrum


Suggest one way on how the load can be lifted by using a smaller effort.

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2. Figure 2 shows the cross section of the human ear.

P M N

Q

Figure 2

(a) Name the parts labeled P and Q.

P : …………………………………. Q : ……………………………………

(b) R is not involved in the hearing process. Label R in Figure 2.

(c) Based on structure M or N in Figure 1, complete Table 1.

Name of structure Function of structure

Table 1

3. Figure 3 shows the apparatus used to investigate the composition of water.


2

P


Figure 3

(a) Name the process of splitting water above.

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(b) What test is used to determine the gases at test tube P and Q ?

Test tube testP

Q

(c) Why is the volume of gases in test tube P and Q different ?

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(d) What is the importance gas Q to human ?

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4. Figure 4 shows a wheelbarrow, which is used by student to carry a load weighing 50 kg.

50kg


3

Q

Water + 2 drops of dilute sulphuric acid

Battery


0.5m

1m

Figure 4

(a) (i) Why is wheelbarrow grouped into second class lever ?

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……………………………………………………………………………………………(ii) What is the distance of the effort from the fulcrum ?

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(iii) Calculate the effort that is used by the student to carry the load in the wheelbarrow.

(Assume the gravitational force acting on 1kg is 10N)

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(b) Give one example for this second class lever other than the one mentioned in 4a(i).

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(c) A student is trying to move a large stone using a long iron rod as shown in Figure 5.

Figure 5

(i) Label F for fulcrum on the figure.

(ii) Suggest one way that will enable the student to move the stone easily. Give reason for your answer.


4


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5. The Figure 6 shows an experiment to study the effect of frictional force on different surfaces.

Figure 6

The experiment is carried out according to the steps below.

S1 A wooden block is hooked to a spring balance with a thread.

S2 The wooden block is then placed on a piece of writing paper.

S3 The wooden block is then pulled along the paper and the reading on the spring balance is taken when block starts to move.

S4 The experiment is repeated by pulling the wooden block on different types of surfaces.

S5 The results of the experiment is recorded in the Table 5 below.

Results :

Type of surface

Force needed to move the wooden block, F/N

Time needed to move the block, t/s

Writing paper P 2 s

Aluminium foil 4.5 N 1 s

Sand paper 6.5 N 6 s

Tissue paper 5.8 N 4 s


5

Wooden blockSpring balance


Table 2

(a) Based on the Figure 7 record the readings of P.

P

Figure 7

P : ___________________N.

(b) State the variables in the experiment.

Manipulated variables

Responding variables

Controlled variables

(c) Based on the Table 2, record the frictional force (Ff) on the wooden block of the different surfaces.

Type of surface Force needed to move the wooden block, F/N

Frictional Force f/N

Writing paper P

Aluminium foil 4.5 N

Sand paper 6.5 N


6

Wooden block


Tissue paper 5.8 N

(d) Based on the Table 2, draw a bar chart to show the frictional force in the different surfaces.

FrictionalforceF/N

Type of surface

(e) Based on the bar chart in (d), what can be said about the frictional force acting on the wooden block on different surfaces.

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(f) Predict the time taken for wooden block to start moving on a glass surface with frictional force 2.5 N.

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(g) State the relationship between the frictional force ( Ff ) acting on the wooden block and the type of surface.


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(h) Based on the Table 2 and bar chart in (d) what can you deduce about the meaning of “ frictional force “.

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6. Figure 8 shows an activity to study air pressure. In the activity, a balloon was placed inwarm water.

Figure 8

(a) (i) What happens to the balloon after a few minutes ?

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(ii) Give a reason for your observation in (a) (i).

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(b) How does temperature affect air pressure ?

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(c) State the relationship between volume of water and air pressure.

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(e) Sketch a graph to show the relationship between volume and air pressure.


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Warm waterBalloon

stone



9

Volume

Air pressure

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FORM2.TEST13