NATIONAL SENIOR CERTIFICATE GRADE 10 - … the health of steel structures. 4.1.1. Identify the...

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MARKS: 100 NAME OF SCHOOL: ……………………………………………………………………… This question paper consists of 11 pages, including the cover page

PHYSICAL SCIENCES: TERM TEST 1

14 MARCH 2016

NATIONAL SENIOR CERTIFICATE

GRADE 10

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INSTRUCTIONS AND INFORMATION

1. Answer ALL the questions in the ANSWER BOOK. 2. Start EACH question on a NEW page 3. Leave ONE line between two sub questions, for example between

QUESTION 2.1 and QUESTION 2.2. 4. Show the formulae and substitutions in ALL calculations. 5. Round off your numerical answers to TWO decimal places. 6. Number the answers correctly according to the numbering system used in

this question paper 7. Give brief motivations, discussions, et cetera where required.

QUESTION 1: MULTIPLE-CHOICE QUESTIONS Four options are provided as possible answers to the following questions. Each question has only ONE correct answer. Choose the answer and write only the letter (A – D) next to the question number (1.1 – 1.7) in the ANSWER BOOK.

1.1. The diagram below represents two pulses, each of amplitude a,

travelling in opposite directions along a slinky coil.

Which ONE of the following represents the resultant amplitude at the

instant that these two pulses meet?

(2)

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1.2. X and Y are different wave motions. In air, X travels much faster than Y but has a much shorter wavelength. Which types of wave motion could X and Y be? Wave X Wave Y A Radio Infrared

B Red light Sound

C Sound Ultraviolet

D Microwaves Red light

(2)

1.3.

The diagrams below represent two sound waves, A and B.

Which ONE of the following combinations comparing the frequency and loudness of A with those of B are correct?

Frequency of A Loudness of A A Greater than B Less than B

B Less than B Greater than B

C The same as B Greater than B

D The same as B Less than B

(2)

1.4. Which ONE of the following is the function of gamma rays A. used to image bone structures

B. radio, television broadcasts

C. sterilise medical equipment

D. laser metal cutting

(2)

1.5. Which ONE of the following is a mixture? A Water C Air

B Oxygen D Calcium carbonate

(2)

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1.6. Which combination of elements below represents a non-metal, metal and metalloids A Carbon Sulphur Potassium

B Silicon Argon Nitrogen

C Beryllium Germanium Oxygen

D Hydrogen Chlorine Aluminium

(2)

1.7. Which ONE of the following is the best definition of electron affinity? A The tendency of an atom to lose an electron. B The change in energy of an atom when it gains an electron

to form a negative ion C The change in energy of an atom when it loses an electron to

form a positive ion. D The tendency of an atom to gain an electron.

(2)

[14] QUESTION 2 (Start on a new page.) The diagram below represents a water wave moving from left to right. ONE wavelength takes exactly 1.5 seconds to pass through a fixed point

2.1. What type of a wave is a water wave? (1) 2.2. Write down the magnitude of the amplitude of this wave. (1) 2.3. Define the term wavelength. (2) 2.4. Determine the magnitude of the wavelength of this wave. (2) 2.5. Write down TWO points on the wave that are in phase. (1) 2.6. Calculate: 2.6.1. The time taken for 5 wave crests to move pass through a certain point

in the path of the wave.

(3)

2.6.2. The speed of the wave (4)

2.6.3. If the frequency of this wave is INCREASED, will the wave move FASTER, SLOWER or WITH THE SAME SPEED? Give a reason for your answer.

(3)

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QUESTION 3 (Start on a new page.) 3.1. Define the term longitudinal wave (2)

3.2. A sound wave travels to a high wall which is 347 m away from the source and is then reflected back to the source. If the speed of sound in air is 343 m.s-1,

3.2.1. Write down one word for the phrase, “reflected sound”. (1)

3.2.2. Calculate the time it takes the sound to return to the source. (4)

3.3. The same sound source used in QUESTION 3.2 above is reflected by sending the sound into the water; Will the time taken by the sound to return to the source be LESS THAN, GREATER or THE SAME as that obtained in QUESTION 3.2.2? Give a reason for your answer.

(3)

3.4. Give a reason why ultrasound is preferred over X rays for use in imaging, especially in pregnant women.

(3)

[13]

QUESTION 4 (Start on a new page.) 4.1. An electromagnetic radiation is highly penetrative and can be used to

inspect the health of steel structures.

4.1.1. Identify the electromagnetic radiation described above. (1)

4.1.2. What property does this radiation gives this radiation its penetrative ability?

(1)

4.2. Photons of wavelength of 6.3%10()*+ are directed on the steel to check the quality of the steel, the steel would be deemed poor if the photons exit from the steel onto the other side.

4.2.1. Define a photon (2) 4.2.2. Calculate the frequency of this photon (3)

4.2.3. Calculate the energy of this photon (3)

4.2.4 How will the energy of this radiation change if photons of a higher wavelength are used instead? Answer with INCREASE, DECREASE or STAYS THE SAME

(1)

4.3 It is said that during an earthquake in Alaska a low percentage of animals died compared to that of human beings. With the WAVE knowledge you have learned, briefly explain how this could have happened and what can man learn from animals.

(3)

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QUESTION 5 (Start on a new page.) Grade 10 learners were given the substances in the table below. Brass Oxygen air Sand Sugar Carbon dioxide

Copper Pure air Salt solution Table salt Magnesium oxide

5.1. From the table, write down; 5.1.1. A homogeneous mixture (1)

5.1.2. A diatomic gas (1)

5.1.3. An element (1)

5.2. The learners perform an experiment to separate a mixture of sand and sugar. The experiment is done in three steps as shown in the diagrams below.

Write down the names of the following;

5.2.1. The process illustrated in step 2 (1)

5.2.2. The process illustrated in step 3 (1)

5.2.3. Solid X (1)

5.2.4. Mixture Y (1)

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QUESTION 6 (Start on a new page) 6.1. The table below shows the melting points and boiling points of four

substances SUBSTANCE MELTING POINT (0C) BOILING POINT (0C) A -117 78 B 133 444 C -220 -188 D 90 184

6.1.1. Define the term melting point (2)

6.1.2. From the table above, write down the LETTER (A - D) that represents the substance which is a:

6.1.2.1. Solid at 100 0C (1) 6.1.2.2. Gas at 25 oC (1) 6.1.2.3. Liquid at 100 oC

(1)

6.1.3. Which ONE of the following diagrams represents the particle arrangement of substance A at -100 0C? Write down only I, II or III

(1)

6.1.4 Substance A is heated at 25 oC. Will the spaces between the particles INCREASE, DECREASE OR REMAIN THE SAME?

(1)

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QUESTION 7 (Start on a new page.) 7. Grade 9 learners are working with two identical cylinders having the

same volume of Chlorine gas. They however found that the mass of the two cylinders are not equal. Their teacher says that the gases are isotopes of Chlorine.

7.1. Define the term isotope. (2)

7.2. Explain why the two cylinders have unequal masses.

(2)

7.3. The notations below represents the isotopes of Chlorine A ,-).

/0

B ,-)./.

7.3.1 Which number in A represents the mass number? (1)

7.3.2 Which isotope has the most neutrons in its nucleus? (1)

7.3.3 State Pauli’s Exclusion Principle. (2)

7.3.4 Write down the S-P Notation for Chlorine. (2)

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QUESTION 8 (Start on a new page.) Atomic radius of period 3 elements are shown in the table below 8.1. Atomic radius of PERIOD 3 elements are shown in the table below

Atomic Number Element Atomic Radius

( x 10-12 m) 11 Sodium 160 12 Magnesium 140 13 Aluminium 124 14 Silicon 114 15 Phosphorus 109 16 Sulphur 104 17 Chlorine 100 18 Argon 101

8.1.1. Define the term atomic radius (2) 8.1.2. What is the general atomic radius trend that is observed in the table

above? (2)

8.1.3. Give the reason for the trend in the atomic radii as observed in the table above.

(2)

8.1.4. How will the atomic radius for an element with atomic number 19 compare with element with atomic Number 11? Answer with Greater or Less Than.

(1)

8.1.5. Give a reason for your answer in 8.1.4 above. (2) 8.2 Sodium reacts with chlorine and form a solid substance. 8.2.1.

What type of chemical bonding takes place in this reaction? Give a reason for your answer.

(3)

8.2.2. Write down the name of the product that forms. (1) 8.2.3. Write down a balanced chemical equation for the reaction that takes

place. (3)

8.2.4. Give a reason why Sodium is stored in paraffin. (2) [18]

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NATIONAL SENIOR CERTIFICATE GRADE 10 - … the health of steel structures. 4.1.1. Identify the...

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