NATIONAL SENIOR CERTIFICATE GRADE 10

NATIONAL SENIOR CERTIFICATE

GRADE 10

PHYSICAL SCIENCES: TERM TEST 1

14 MARCH 2016

MARKS: 100 NAME OF SCHOOL: .................................................................................

This question paper consists of 11 pages, including the cover page

Page 1 of 11

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)

Page 2 of 11

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 A Radio

Wave Y 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 A Greater than B

Loudness of A 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)

Page 3 of 11

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)

[17]

Page 4 of 11

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 4.3

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)

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)

[14]

Page 5 of 11

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