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Science Olympiad > Quiz questions > Flashcards

Quiz questions Flashcards

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1
Q

What does D.C stand for?

A

direct current

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2
Q

what does A.C stand for?

A

alternating current

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3
Q

How many different versions of a.c are there?

A

single phase and polyphase

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4
Q

D.C has what type of polarities?

A

positive and negative

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5
Q

what colour is positive terminals?

A

red

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6
Q

colour of negative terminals?

A

black

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7
Q

3 major states of matter?

A

solid liquid gas

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8
Q

what is an element?

A

A single uncombined substance consisting of one type of atom

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9
Q

What is a compound?

A

type of atom that contains two or more elements with atoms of more than one type

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10
Q

Amount of electrons in the outter valence?

A

8

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11
Q

Atoms with 1-3 valence electrons?

A

Conductors

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12
Q

Atoms with 5-8 valence electrons?

A

Insulators

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13
Q

Atoms with 4 valence electrons are called what?

A

Semi-conductors

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14
Q

Smallest unit which an element can be broken down?

A

atom

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15
Q

What is the smallest unit which a substance can be broken down?

A

molecule

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16
Q

3 ways in which a body may receive a charge?

A

conduction, induction, and friction

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17
Q

Negatively charged atom?

A

Ion

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18
Q

A positive charged atom?

A

cation

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19
Q

how is piezoelectricity produced?

A

applying pressure

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20
Q

how is photovoltaic electricity produced?

A

by light

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21
Q

How is triboelectricity produced?

A

by friction

22
Q

how is electrochemical electricity produced?

A

by chemical means

23
Q

How is thermoelectrical electricity produced?

A

produced by heat

24
Q

How is magnetoelectrical electricity produced?

A

produced by magnetism

25
Q

What direction do electrons flow?

A

negative to positive

26
Q

How far must you stay away from fallen power lines?

A

10 metres

27
Q

how far must you be away from energized lines when operating equipment?

A

3-7metres

28
Q

What does potential difference mean?

A

voltage difference

29
Q

Which diagram shows the highest outage at the top and lower voltage at the bottom?

A

One line diagram

30
Q

Which diagram is the best for the do-it-yourself hobbyist?

A

a wiring diagram

31
Q

Which diagram is like circuit maps?

A

Schematic diagram

32
Q

What does a multimeter measure?

A

AC DC voltage
AC DC amps
resistance

33
Q

What are field forces?

A

Forces between electric charges

34
Q

How many ways may a body receive a charge and what are they?

A

Three.

Friction, Conduction, Induction

35
Q

Electricity from friction?

A

When two dissimilar substances are brought close to each other or rubbed together, also known as the triboelectric effect

36
Q

Conduction?

A

When a body comes into contact with an uncharged body

37
Q

Induction?

A

Principal of inducting a current flow in a wire when it is moved within a magnetic field

38
Q

The six major categories that can be converted into energy?

A 
Heat
Light
Friction 
Chemical 
Magnetism 
Mechanical pressure
39
Q

electricity from heat?

A

the thermoelectric effect, when 2 dissimilar metals are heated , greater the heat the greater the emf

40
Q

electricity from light?

A

light energy is transmitted by small particles known as photons

41
Q

Electricity from magnetism?

A

The principle of inducting the current flow in a wire when it is moved within a magnetic field

42
Q

electricity from chemical energy?

A

two dissimilar electrodes are inserted into a electrolyte with interacts with the metals, causing electrons to transfer

43
Q

Electricity from Mechanical Pressure?

A

Interacting of electrostatic and mechanical stresses within certain crystals

44
Q

What is the difference between electrical power and energy?

A

Energy is the ability to do or store work and power is the rate of doing work

45
Q

Ohms law states that current is directly proportional to the _____, and inversely proportional to the _________?

A

voltage and resistance

46
Q

formula for coulomb’s law of electrostatic charges?

A

F = K x Q1 x Q2 / D2

47
Q

What is a coulomb?

A

it is equal to the quantity of electricity conveyed in one second by a current of one ampere

48
Q

One ampere is equal to what?

A

6.24 x 10 18 power , electrons per second and is also equal to one coulomb per second

49
Q

What are the 4 factors used to determine the resistance of a piece of wire?

A
  • M material it’s made of
  • A cross sectional area
  • L conductor length
  • T it’s temperature
50
Q

“ohms per mil-ft” of copper and aluminum?

A

copper is 10.4

aluminum is 17

51
Q

When an atom losses an electron , the atom becomes?

A

positive

Science Olympiad (13 decks)

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