national senior certificate (nsc) - dcc.edu.za _dcc_ physical... · 1.1 the gravitational force...

© ICG 1 NSC Grade 11

PHYHIG111

GRADE 11 MID-YEAR EXAMINATION

PHYSICAL SCIENCES PAPER 1 (PHYSICS) (NSC11-11)

D10055641-4-A TIME: 09H00 – 12H00 TOTAL: 150 MARKS

DURATION: 3 HOURS DATE: 12 JUNE 2013

This question paper consists of 17 pages.

NATIONAL SENIOR CERTIFICATE (NSC)

Physical Sciences Paper 1 (Physics)


INSTRUCTIONS AND INFORMATION Read the following instructions carefully before answering the questions: 1. Write your name and student number in the appropriate spaces on the ANSWER

SHEET and ANSWER BOOK. 2. Answer ALL the questions. 3. Answer SECTION A on the attached ANSWER SHEET. 4. Answer SECTION B in the ANSWER BOOK. 5. Answer QUESTION 3.3 of SECTION B on the attached ANSWER SHEET. 6. Non-programmable calculators may be used. 7. Appropriate mathematical instruments may be used. 8. Number the answer correctly according to the numbering system used in this question

paper. 9. Data sheets are attached for your use. 10. Give brief motivations, discussions, et cetera where applicable. 11. Please write neatly − we cannot mark illegible handwriting. 12. Any student caught cheating will have his or her examination paper and notes

confiscated. The College will take disciplinary measures to protect the integrity of these examinations.

13. If there is something wrong with or missing from your question paper or your answer book, please inform your invigilator immediately. If you do not inform your invigilator about a problem, the College will not be able to rectify it afterwards, and your marks cannot be adjusted to allow for the problem.

14. This question paper may be removed from the examination hall after the examination has taken place.

This question paper consists of TWO sections: Section A and Section B. Answer ALL the questions.

Question Section Marks

1 A: Multiple-choice questions Answer the question

20

2

B: EIGHT direct questions Answer ALL the questions

130

3 4 5 6 7 8 9

TOTAL MARKS: 150



_________________________________________________________________________

SECTION A (20 MARKS) _________________________________________________________________________

ANSWER THE QUESTION _________________________________________________________________________ NOTE: Answer this section on the attached ANSWER SHEET. QUESTION 1 – MULTIPLE-CHOICE QUESTIONS Four possible options are provided as answers to the following questions. Each question has only ONE correct answer. Choose the answer and make a cross (X) in the block (A. – D.) next to the question number (1.1 – 1.10) on the attached ANSWER SHEET. 1.1 The gravitational force between two objects is 100 N when their

centres are placed x metres apart. If the distance between their centres is halved and the mass of one object is doubled, the new gravitational force between them is:

A. 100 N. B. 400 N. C. 1600 N. D. 800 N. (2)

1.2 Standing passengers in a train tumble forward when the train

stops suddenly as a result of their:

A. velocity. B. inertia. C. acceleration. D. weight. (2)

1.3

A 10 kg object exerts a force of F on a 5 kg object. The force that

the 5 kg object exerts on the 10 kg object is:

A. F. B. 2F. C. ½F. D. 4F. (2)



1.4 Acceleration is the rate at which _____ changes.

A. velocity B. displacement C. distance D. speed (2)

1.5 The quantity that is measured in kg.m.s–2 is:

A. acceleration. B. force. C. velocity. D. displacement. (2)

1.6 When a parachutist falls freely, he reaches a maximum speed

called terminal velocity. This occurs when air friction:

A. is smaller than the weight of the parachutist. B. is greater than the weight of the parachutist. C. equals the weight of the parachutist. D. is absent. (2)

1.7 Two pulses move through a medium as in the sketch below. They

find themselves simultaneously at exactly the same point in the medium.

When the pulses overlap, which one of the following phenomena

will occur?

A. diffraction B. constructive interference C. destructive interference D. refraction (2)

1.8 When a light ray enters an optically less dense medium

diagonally, it is:

A. refracted away from the normal. B. refracted towards the normal. C. refracted along the normal. D. not refracted. (2)



1.9 Orange light and green light pass through a single slit. The fringes are found to be further apart when orange light is used, than they are when green light is used. This shows that green light has a:

A. greater intensity than orange light. B. lower intensity than orange light. C. longer wavelength than orange light. D. shorter wavelength than orange light. (2)

1.10 Snell’s Law defines:

A. the critical angle of an optical medium. B. the conditions for total internal reflection. C. the relationship between the angles of incidence and

refraction. D. the relationship between the angles of incidence and

reflection. (2) [20]

TOTAL SECTION A: 20



_________________________________________________________________________

SECTION B (130 MARKS) _________________________________________________________________________

ANSWER ALL THE QUESTIONS _________________________________________________________________________ INSTRUCTIONS AND INFORMATION: 1. Answer SECTION B in the ANSWER BOOK.

2. The formulae and substitutions must be shown in ALL calculations.

3. Round off your answer to TWO decimal places.

4 Use the attached graph paper to answer question 3.3. QUESTION 2 Two tugboats pull a large ship into a harbour by applying forces of 3 000 N and 10 000 N each at right angles to each other as indicated in the sketch below.

2.1 Define the term resultant force. (2) 2.2 Assume that the engines of the large boat have been turned off

and that it experiences a drag force of 1 000 N during the towing. Calculate the resultant force on the large boat. (8) [10]



QUESTION 3 A group of learners investigated the relationship between force and acceleration for a dynamics trolley running down a ramp (runway). The following apparatus was used in the investigation: • One dynamics trolley

• A ticker timer

• Four lengths of ticker tape

• A ramp / runway

• A stiff string

• A pulley

• Four 250 g mass pieces They used the following experimental setup to conduct their investigation.

The runway was inclined and the trolley was allowed to accelerate down the ramp. The experiment was repeated three times, each time increasing the mass on the left by 250 g. The incline was kept constant during the entire investigation. The four ticker tapes were analyzed and the results recorded in the table below. FORCE (N) MASS (Trolley-units) ACCELERATION (m.s–2)

2.5 1 1.25 5.0 1 2.50 7.5 1 3.75

10.0 1 5.00 3.1 Give a reason why the ramp (runway) is inclined. (2) 3.2 Apart of the inclination angle of the ramp, which other variable did

the learners keep constant? (2)



3.3 Draw a line graph of acceleration on the x-axis and force on the y-axis on the graph paper included. Indicate the following on your graph:

• Suitable heading

• Labels for the axes

• Appropriate scale

• The four plotted points (4) 3.4 Draw a conclusion from the graph. (2) 3.5 Which quantity does the gradient of the graph represent? (2) 3.6 Calculate the magnitude of the quantity named in Question 3.5. (3) [15] QUESTION 4 A crate, mass 50 kg that is on the point of sliding down rests on a ramp with an angle of inclination equal to 25o as in the sketch below.

Calculate the following: 4.1 The magnitude of the maximum static frictional force (4) 4.2 The magnitude of the normal force (4) 4.3 The static frictional coefficient for the ramp – crate interface (4) 4.4 The magnitude of the force that the crate exerts on the ramp (1) 4.5 Name and state the law that you have used to answer

Question 4.4. (4) [17]



QUESTION 5 Two objects A and B, with masses 10 kg and 20 kg respectively, are pulled to the right across a rough surface by a 52.5 N force as in the sketch below. A rope that makes an angle of 20º with the horizontal connects A and B. A experiences a frictional force of 5 N and B experiences a frictional force of 10 N. The rope remains stiff while the force acts on B and it can be assumed that its mass is zero.

5.1 Define Newton’s second law of motion. (4) 5.2 Name the type of friction that A and B experiences. (2) 5.3 Draw a free-body diagram (or a force diagram) for B and label all

the forces that act on it. (5) 5.4 Calculate the acceleration of A and B. (8) 5.5 Calculate the magnitude of the tension in the rope between A

and B. (4) [23] QUESTION 6

Two objects of mass 500 kg and 1 500 kg respectively are placed in such a way that their centres are 30 mm apart. 6.1 Calculate the gravitational force that the two objects exert on each

other. (5) 6.2 Name and state the law that you have used to answer

Question 6.1. (4) 6.3 Derive an equation that shows that the gravitational acceleration

of an object on any planet is independent of its mass. (3) [12]



QUESTION 7 A light ray enters a glass prism from air as follows:

Answer the following questions: 7.1 What is the above phenomenon called? (2) 7.2 Write down the following rays: 7.2.1 Incident ray (1) 7.2.2 Normal ray (1) 7.2.3 Emergent ray (1) 7.3 Write down the names of the following angles: 7.3.1 CBF∠ (1) 7.3.2 G∠ (1) 7.4 If the refractive indices of air and glass are 1 and 1.5 respectively,

calculate the value of the angle of refraction in the above diagram. (4) 7.5 Study the following object and answer the questions that follow:

7.5.1 Identify the object. (1)



7.5.2 What phenomenon occurs inside this object? (1) 7.5.3 Name the TWO conditions that must be met for the

phenomenon named in Question 7.5.2 to occur. (4) 7.5.4 Name TWO important applications of this object. (2) 7.6 A bird flies over a pond and spots a fish under the water that it

intends catching as in the sketch below.

7.6.1 Will the bird be able to catch the fish if it dives into the

pond at this angle? (1) 7.6.2 Sketch a neat ray diagram to support your answer to

Question 7.6.1. (4) 7.6.3 Explain why it is dangerous to determine the depth of a

pool by looking at the tiles on the floor of the pool before jumping into it. (2) [26]



QUESTION 8

Parallel water waves pass through a slit as in the above sketch. 8.1 Make a neat drawing of the waves after they have passed through

the slit in the vicinity of X. (2) 8.2 What do we call the phenomenon that allowed you to draw the

sketch in Question 8.1? (1) 8.3 Define the phenomenon that you have named in Question 8.2. (2) 8.4 Explain briefly how the phenomenon identified in Question 8.2 is

affected by: 8.4.1 the wavelength of the water waves. (3) 8.4.2 the width of the slit. (3) 8.5 Name and state the principle that can be used to explain the

phenomenon identified in question 8.2. (4) [15] QUESTION 9 Two learners pass monochromatic red light through a single slit and saw the pattern below on a screen.

9.1 Define the term monochromatic light. (2)

KEY Dark band

Bright band X



9.2 What important property of light is demonstrated by the pattern observed by the two learners? (2)

9.3 Explain the formation of: 9.3.1 the dark band. (2) 9.3.2 the bright band. (2) 9.4 How will the above pattern change if the following changes are

made? 9.4.1 monochromatic blue light is used instead of red (2) 9.4.2 a narrower slit is used (2) [12]

TOTAL SECTION B: 130

GRAND TOTAL: 150 MARKS



DATA FOR PHYSICAL SCIENCES PAPER 1 (PHYSICS)

GRADE 11 TABLE 1: PHYSICAL CONSTANTS

NAME SYMBOL VALUE Acceleration due to gravity g 9,8 m.s-2

Gravitational constant G 6,7 x 10-11 N.m2.kg-2

MATHEMATICAL AIDS:

TABLE 2: FORMULAE MOTION vf = vi + aΔt

Δx = viΔt + ½ aΔt2

vf

2 = vi2 + 2aΔx

Δx = t

2fviv

+

FORCE Fres / net = ma

Nf ss μ=max

F = 2d2m1Gm

(G = 6,7x 0-11 N.m2.kg-2) fk = μkN

Fg = mg or W = mg

WAVES, SOUND AND LIGHT

n = vc

nisinθi = nrsinθr

A

B C θ

sinθ = ACAB

cosθ = ACBC

tanθ = BCAB

AC2 = AB2 + BC2



FOR YOUR NOTES:



GRADE 11 – MID-YEAR EXAMINATION

PHYSICAL SCIENCES PAPER 1 (PHYSICS)

ANSWER SHEET Detach from your question paper and insert in your Answer Book. NAME: __________________________________________________________________ STUDENT NUMBER: _______________________________________________________ QUESTION 1

1.1 A B C D

1.2 A B C D

1.3 A B C D

1.4 A B C D

1.5 A B C D

1.6 A B C D

1.7 A B C D

1.8 A B C D

1.9 A B C D

1.10 A B C D

[10 × 2 = 20]

TOTAL SECTION A: 20



GRADE 11 – MID-YEAR EXAMINATION

PHYSICAL SCIENCES PAPER 1 (PHYSICS)

ANSWER SHEET Detach from your question paper and insert in your Answer Book. NAME: __________________________________________________________________ STUDENT NUMBER: _______________________________________________________ QUESTION 3.3

national senior certificate (nsc) - dcc.edu.za _dcc_ physical... · 1.1 the gravitational force...

Documents