PROVINCIAL MID YEAR EXAMINATION MID YEAR EXAM GRADE 11 - North West

[Pages:18]Physical Sciences

JUNE 2018

PROVINCIAL MID YEAR EXAMINATION

MID YEAR EXAM

GRADE 11

PHYSICAL SCIENCES MAY/JUNE 2018

QUESTION PAPER

MARKS: 150 TIME: 3 hours

This question paper consists of 13 pages, a graph paper, 3 data sheets and a periodic table.

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INSTRUCTIONS AND INFORMATION

1.

Write your name on your ANSWER SHEET.

2.

This question paper consists of ELEVEN questions. Answer ALL the

questions in the ANSWER SHEET.

3.

Start EACH question on a NEW page on the ANSWER SHEET.

4.

Number the answers correctly according to the numbering system used in

this question paper.

5.

Leave ONE line between two sub questions, for example between

QUESTION 2.1 and QUESTION 2.2.

6.

You may use a non-programmable calculator.

7.

You may use appropriate mathematical instruments.

8.

You are advised to use the attached DATA SHEETS.

9.

Show ALL formulae and substitutions in ALL calculations.

10.

Round off your final numerical answers to a minimum of TWO decimal

places.

11.

Give brief motivations, discussions, et cetera where required.

12.

Write neatly and legibly.

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JUNE 2018

QUESTION 1: MULTIPLE-CHOICE QUESTIONS

Four options are provided as possible answers to the following questions. Each question has only ONE correct answer. Write only the letter (A-D) next to the question number (1.11.10) on your ANSWER SHEET, for example 1.1 D.

1.1 According to the vector diagram of the forces F1, F2 and F3 the resultant force is:

F 2 F 1

F 3

A F1

B F2

C F3

D Zero

(2)

1.2 As a bus pulls away from the curb, the standing passengers move backwards as a result of one of Newton's Law's. Which law?

A Newton's First Law

B Newton's Second Law

C Newton's Third Law

D Newton's Law of Universal Gravity

(2)

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1.3 Which ONE of the following is an example of a non-contact force?

A Frictional force

B Gravitational force

C Tension force

D Normal force

(2)

1.4 A ray of light strikes a glass block at an angle , as shown below. The ray passes through the glass block and emerges on the opposite side.

At what angle to the normal does the ray emerge from the glass block?

A

B

C 90? ?

D 90? ?

(2)

1.5 The diagram below shows water waves that spread out after passing through a single slit.

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The wave phenomenon observed after the water waves passes through the slit is ...

A reflection

B diffraction

C dispersion

D total internal reflection

(2)

1.6 According to the VSEPR theory, the shape of an aluminium chloride (AlCl3) molecule is: A Trigonal planar B Trigonal bi-pyramidal

C Trigonal pyramidal

D Tetrahedral

(2)

1.7 What forces occur between molecules of ammonia (NH3)? A Ion-ion forces B Non-polar ? non-polar forces

C London forces

D Hydrogen bonds

(2)

1.8 The phenomenon that allows water strider to walk on water' A Capillarity B Adhesion

C Evaporation

D Surface Tension

(2)

1.9 The temperature (in kelvin) of a fixed mass of an enclosed gas is given as T. Which ONE of the following CORRECTLY represents the new temperature if both the pressure and the volume of the gas are doubled? A ?T

B ?T

C 2T

D 4T

(2)

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1.10 The mass of 4,48 dm3 of oxygen (O2 gas) at STP is ... A 6,4 g B 3,2 g C 4,48 g D 0,8 g

JUNE 2018

(2) [20]

QUESTION 2 A large wrecking ball is held in place by two light steel cables. The mass, m, of the wrecking ball is 1620 kg.

1620 kg

2.1 Explain the concept Forces in Equilibrium.

(2)

2.2 Draw a triangle of forces in equilibrium and indicate at least one angle.

(4)

2.3 Calculate

2.3.1 the magnitude of the tension TA in the cable that makes an angle of 26?

with the vertical.

(3)

2.3.2 the magnitude of the tension TB in the horizontal cable.

(3)

[12]

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QUESTION 3 Two blocks of masses 7 kg and 5 kg respectively are connected by a light inextensible string that runs over a light frictionless pulley as shown in the diagram below. The 7 kg block is pulled to the left with a force of 68 N at an angle of 12? to the horizontal .The 7 kg block experiences a frictional force of 6 N. The coefficient of kinetic friction between the 5 kg block and the surface of the inclined plane is 0,18.

3.1 Define the term Normal Force.

(2)

3.2 Draw a labelled, free-body diagram to indicate ALL the forces acting on the 5 kg

object.

(4)

3.3 Distinguish between static friction and kinetic friction.

(4)

3.4 Calculate

3.4.1 the frictional force acting between the 5 kg block and the surface of the

inclined plane.

(4)

3.4.2 the acceleration of the 7 kg block.

(7)

3.4.3 the magnitude of the tension T in the string between the blocks.

(3)

[24]

QUESTION 4 Satellite A with a mass of 615 kg is in orbit around the Earth

4.1 State Newton's Law of Universal Gravitation.

(2)

4.2 The Earth exerts a force of 5000 N on satellite A to keep it in orbit, calculate the

height, in kilometers, of the satellite above the surface of the Earth.

(5)

[7]

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QUESTION 5

Learners investigate how the path of a light ray incident on an air-glass boundary changes as it enters the glass medium. Their results are shown in the table below.

angle i

15 25 45 55 60 70

angle r

10 16 28 33 35 39

sin i

0,259 0,423 0,707 0,819 0,866 0,940

sin r

0,174 0,276 0,469 0,545 0,574 0,629

5.1 For this investigation, write down the:

5.1.1 Dependent variable

(1)

5.1.2 Independent variable

(1)

5.1.3 Constant (control) variable

(1)

5.2 Draw an appropriate graph of the data in the table and use it to obtain the

refractive index of the glass material.

USE THE GRAPH PAPER ATTACHED TO YOUR QUESTION PAPER TO

ANSWER THIS QUESTION.

(8)

5.3 Use the result in QUESTION 5.2 to calculate the speed of light through the

glass material.

(3)

[14]

QUESTION 6 Olive oil floats on water because its density is less than the density of water. However, the refractive index of olive oil is 1,47 while the refractive index of water is 1,33.

6.1 Define the term refractive index.

(2)

6.2 If light travels through water and hits the water-olive oil at an angel of 37?,

calculate the angle of refraction of light in olive oil.

(4)

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