science ams g9 t2 w12

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Level K Science Page 1 of 4

1314Science

Term 2 Week 12

Week 12 (Mar. 913)

AMS : 19920

Sample Questions Exam

1. In the following circuit:

a) name the bulbs connected in series.

b) name the bulbs conncected in parallel.

2. a) A current passes through a 12 ohm resistor, R1, connected in series to a 6 ohm resistor, R2. The

voltage across the first resistor is 12 V. The voltage across the second resistor is 6 V. In which resistor

is the current greater? Find the current in each.

b) A 20 ohm resistor is connected in series with a 5 ohm resistor. The current passing through the first

resistor is 3 A. Find the current passing through the second resistor.


voltage across the first resistor is 12 V. What is the current in the first resistor? What is the current in

the second resistor? How much is the voltage across thesecond resistor? How much is the voltage

across the combination of both resistors?

b) The voltage across one resistor is 10 volts. The voltage across another resistor connected in series

with the first is 12 volts. Find the potential difference across the combination of both resistors.

4. What is the name given to the number of oscillations the pendulum makes in one second?


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5. Knowing that the typical reaction time is 0.2s, calculate the percentage uncertainty (maximum error)

expected when measuring a single oscillation of a pendulum with a period of 2.0 s.

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)/6 "#$% 0&,-4% +/*2(05, 8/-0 9&4(&26

7. What does the slope of the graph of total time taken vs. the number of oscillations made represent?

8. What is the name given to a complete to-and-fro movement of the pendulum?

9. Describe the differences between series and parallel circuits.

10. What is the shape of V vs I Graph for a resistor?

11. What letter is used to represent resistance? What is the name of the unit of resistance? What symbol do

we use for it?

12. What is the relation between voltage and current across a resistor?

13. A current of 0.5 A passes through a 10 ohm resistor R1 connected in series to a resistor R2. What is the

voltage across the first resistor? The voltage across the second resistor is 10V. How much is the

resistance of the combination?

A 12 ohm resistor R1 is connected in series to a 15 ohm resistor R2. How much is the resistance of thecombination?

14. Know the main different barriers that prevent pathogens from entering the body.

15. Define the term inflammation .

16. Describe how inflammatory response fights pathogen.


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17. What is an immune response?

18. In a parallel circuit if the main current is I what happens to it across the branches ?

19. If the voltage across the battery is 1.5 V what is the voltage across each branch in a parallel circuit?


voltage across the first resistor is 12 V. What is the current in the first resistor? What is the current in

the second resistor? How much is the voltage across the second resistor? How much is the voltage

across the combination of both resistors?

b) The voltage across one resistor is 10 volts. The voltage across another resistor connected in series

with the first is 12 volts. Find the potential difference across the combination of both resistors.

21. What is the definition of power?

22. Which of the following is/are correct?

a)

The symbol of power is P.

b) The unit of power is the joule.

c) The symbol of watt is W.

23. What is the period T of a pendulum when t and n are given?


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SABISOS PROPRIETARY

SABISOSScience AMS Term 2 Week 12 Grade 9

____________________________________________________________________________________________________________________

1. a) C only. b) A and B

2. a) current is the same in both resistors as it is a series circuit. b) 3A

3. a) i) 1.2 A ii) 1.2 A iii) 6V iv) 18 V b) 22V

4. Frequency

5. 20 %

6. i) t vs n graph is a straight line passing through the origin. ii) Find the time for 10, 20, and

30 oscillations and plot t Vs n. iii) the slope of t Vs n graph is a constant.

7. Period of the pendulum

8. Oscillation

9. Series: One component turns off, all of them do + voltage is lowered every time a new

device is added making devices weaker e.g bulbs less bright

Parallel: Same brightness throughout and if one component fails the others do not10. A straight line passing through the origin

11. R. ohm. !

12. V and I are directly proportional

13. a) i) 5.0 V ii) 30 !b) 27 !

Biology: Section 5.4 P. 231 - 233

14. Skin, tears, juices, linings of the nose, mouth, throat, windpipe, and reflexes.

15 + 16 . When you cut your finger, blood comes, out, and the injured area becomes red,

hot, and swollen. These are signs that the body is working to prevent pathogens from

entering the cells. When cells trigger blood to become more permeable so that special

white blood cells called phagocytes leak out of the blood vessels, engulf and destroypathogens found in an injured area.

17. It is when the pathogen passes the first two lines of defense so the immune system

generates special blood cells called lymphocytes to destroy the pathogen.

18. It splits across the braches such that I(Total) = I (Branch 1) + I (Branch 2)

19. It is the same. 1.5 V

20. Same as Q3

21. Energy given out per unit of time

22. A and C are correct. B is false Correction: unit of power is the watt.

23. T = t/n

Make sure you practice the concepts and READ BIOLOGYbecause not all the conceptsare mentioned. Good Luck !

(H)

science ams g9 t2 w12

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