El-ROI Special Needs

Excellence is not an act but a habit.

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At Elroi Special Needs,we don't compromise,we strategize

Everyone experiences “I can’t” thoughts:
I can’t go back to school.
I can’t get a promotion.
I can’t be successful.
In fact, 80% to 90% of our thoughts are repetitive, useless, and negative.

When we have the thought “I can’t do that,” remember that your thoughts aren’t facts. So if you’d like to pursue something, give it a shot. Every challenge holds a lesson, an opportunity to explore ourselves and to build meaning.

Join Unleash The Power Within Virtual on 22-25 October 2020 together with Tony Robbins and discover how to control your beliefs. Click here: https://bit.ly/3fRx09m

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Do not succumb to covid19.At Elroi special needs(home education)we are already exercising covid 19 regulations.Do not compromise your child's learning.Wisdom, knowledge and safety combined.

Invest in your children future with Elroi Special Needs,you will never go wrong....Thats a prophecy.

Now that you have explored the concept of calculus ,evaluate the following limits:

DIFFERENTIAL CALCULUS:The concept of a limit.
The starting point of understanding calculus begins with the concept of a limit.From the idea of a limit,calculus is developed into a masterpiece of the precision of Mathematics.Below is the foundation of it all.Now ,tell me what your conclusion is after observing the 2 tables below

Grade 10 Electricity Test
PHYSICAL SCIENCES - CLASS TEST
Time: 40 minutes Marks: 45

QUESTION 1

There are four possible options for each answer in the following questions. Each question has only ONE correct answer. Choose the correct answer and write only A, B, C or D next to the question number.

1.1 Consider the following diagram of a circuit. The light bulbs are not necessarily identical.

The reading on A2 will be equal to:

A the reading on A1
B half the reading on A1
C the reading on A3 minus the reading on A1
D the reading on A1 minus the reading on A3. (2)

1.2 10 C of charge passes a point in a circuit in 2 minutes. The current in the circuit is:

A 0,083 A
B 0,2 A
C 5 A
D 12 A (2)

1.3 Resistors connected in series are called dividers of

A current
B charge
C potential
D energy (2)

[6]

QUESTION 2

Give one word or term for each of the following descriptions. Write only the word or term next to the question number.

2.1 Negatively charged materials have (FEWER/MORE) positive charges than negative charges. (2)

2.2 A measure of how much charge is passing a certain point in a circuit in a given amount of time. (2)

[4]

QUESTION 3

Keketso and Jacob are investigating the effect that a charged object has on a neutral object. They are given the following items:

a Perspex rod
a silk cloth
two polystyrene balls wrapped in metal foil suspended together from a wooden rod.

They rub the Perspex rod with the silk cloth and the rod becomes negatively charged. They bring it close to the two balls. They observe that both of the balls are attracted to the rod.

3.1 Explain why the foil-covered polystyrene balls are attracted to the Perspex rod when they have a neutral charge. (4)

3.2 Draw a sketch to illustrate your answer in QUESTION 3.1. (3)

3.3 What environmental condition may cause this investigation not to work effectively? (1)

Both of the balls then touch the Perspex rod and are removed. The balls then repel each other.

3.4 Explain what occurred as the balls touched the rod. Be sure to explain why they repelled each other. (4)

[12]

QUESTION 4

Consider the diagram of a circuit containing one cell connected to 2 bulbs in series with a switch that is closed.

4.1 Copy the diagram onto your answer sheet and draw in an ammeter that measures the current through the wire at A. (1)

4.2 The current at A was found to be 0,6 A. What is the current at point C? (1)

4.3 How much current passed point C if the circuit was closed for 2 minutes? (3)

4.4 In the circuit diagram drawn in question 4.1, draw in a voltmeter measuring the potential difference between point A and B. (1)

4.5 The battery was marked as 3,0 V. The voltage across AB was found to be 1,8 V. What is the voltage across CD? Explain why VAB is different to VCD. (2)

4.6 How will the brightness of bulb 1 compare to bulb 2? Explain why this is observed. (2)

[10]

QUESTION 5

Consider the circuit below: The bulbs are identical. The resistance of the battery, ammeter and connecting wires can be ignored.

5.1 Calculate the voltage of all three cells if they can transfer 90 J of energy to 20 C of charge. (4)

5.2 What would the potential difference of each cell be? (2)

5.3 A charge of 30 C of charge passes a point in the main circuit in 40 s. Determine the strength of current passing through the main circuit. (4)

5.4 Determine the current through each individual light bulb. (2)

5.5 If one of the light bulbs burns out, how would the brightness of the other two bulbs be affected? Write only SHINE BRIGHTER/SHINE DIMMER. (1)

[13]

(Total marks 45)

Indicators: Chemical
substance which changes
colour when it reacts with an
acid or an alkali.

Stay home and stay safe from covid19,however you can't afford to miss catchup classes.Coming soon,videos,slides and presentations on 5weeks catchup classes.GradeR-12 subjects and content of your choice.

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