Physical Sciene Exam Paper March 2012 Grade 12

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GRAAD 12

NATIONAL SENIOR CERTIFICATE

GRADE 12

PHYSICAL SCIENCES: PHYSICS (P1) FEBRUARY/MARCH 2012

MARKS: 150 TIME: 3 hours

This question paper consists of 16 pages and 3 data sheets.

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Physical Sciences/P1

2 NSC

DBE/Feb.–Mar. 2012

INSTRUCTIONS AND INFORMATION 1. 2. 3. Write your centre number and examination number in the appropriate spaces on the ANSWER BOOK. Answer ALL the questions in the ANSWER BOOK. This question paper consists of TWO sections: SECTION A (25) SECTION B (125) 4. 5. 6. 7. 8. 9. You may use a non-programmable calculator. You may use appropriate mathematical instruments. Number the answers correctly according to the numbering system used in this question paper. YOU ARE ADVISED TO USE THE ATTACHED DATA SHEETS. Give brief motivations, discussions, et cetera where required. Round off your final numerical answers to a minimum of TWO decimal places.

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Physical Sciences/P1

3 NSC

DBE/Feb.–Mar. 2012

SECTION A QUESTION 1: ONE-WORD ITEMS Give ONE word/term for each of the following descriptions. Write only the word/term next to the question number (1.1–1.5) in the ANSWER BOOK. 1.1 1.2 1.3 1.4 1.5 The type of energy an object has due to its motion The phenomenon which occurs when two light waves meet at a given point The unit of measurement of electrical resistance The basic principle on which electric generators function The type of line spectrum observed when electrons in an atom move from the excited state to the ground state (1) (1) (1) (1) (1) [5]

QUESTION 2: 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 (2.1–2.10) in the ANSWER BOOK. 2.1 A car of mass m collides head-on with a truck of mass 2m. If the car exerts a force of magnitude F on the truck during the collision, the magnitude of the force that the truck exerts on the car is … A B C D

1 F 2
F

2F
4F

(2)

2.2

An object moves in a straight line on a ROUGH horizontal surface. If the net work done on the object is zero, then … A B C D the object has zero kinetic energy. the object moves at constant speed. the object moves at constant acceleration. there is no frictional force acting on the object. (2)

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Physical Sciences/P1

4 NSC

DBE/Feb.–Mar. 2012

2.3

A ball is released from rest from a certain height above the floor and bounces off the floor a number of times. Ignore the effects of air resistance. Which ONE of the following velocity-time graphs best represents the motion of the ball? A velocity (m·s )

-1

B
velocity (m·s )
-1

time (s)

time (s)

C
velocity (m·s )
-1

D
velocity (m·s )
-1

time (s)

time (s)

(2) 2.4 The diagram below shows plane water waves that spread out after passing through a single slit.

barrier with single slit plane water waves

The wave phenomenon observed after the water waves pass through the slit is … A B C D reflection. diffraction. refraction. photoelectric effect. (2)

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Physical Sciences/P1

5 NSC

DBE/Feb.–Mar. 2012

2.5

Monochromatic light from a point source passes through a device X. A pattern is observed on a screen, as shown in the diagram below. Key:
Colour band Dark band

monochromatic light source

X

From the observation on the screen, it can be concluded that device X is a … A B C D 2.6 prism. single slit. double slit. concave lens. (2)

In the circuit diagram below, the internal resistance of the battery and the resistance of the conducting wires are negligible. The emf of the battery is E. E

A

V

2R

R

S

When switch S is closed, the reading on voltmeter V, in volts, is ... A B C D 0 1 E 3 2 E 3
E

screen

(2)

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