Which of the following best describes how length and temperature affect the resistance of wires

as length + temp. increase, resistance increases

the electrical energy used by electrical devices over time

A series circuit has a

battery, wires, switch, load & one path for current to flow

Which of the following is a list of characteristic physical properties?

density, melting point, and freezing point

Which definition is correct?

An ecosystem includes both biotic and abiotic features

carries a - charge and is very small compared to the proton

Loads connected in series

increase the total resistance of the circuit

Which of the following includes only abiotic features?

temperature, wind, light, water

Electrostatic painting works because

the paint and the object have opposite charges

From his gold foil experiment, Ernest Rutherford theorized that the atom

consists of a dense central nucleus containing protons

The identity of an element is determined by

the number of protons in the atom

The process of cellular respiration

releases energy from food using oxygen

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Grade 9 Science Review

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Questions 24

Answers

1
Which of the following best describes how length and temperature affect the resistance of wires
as length increases + temp. decreases, resistance decreases
as length + temp. increase, resistance decreases
as length increases + temp. decreases, resistance increases
as length + temp. increase, resistance increases
2
The atomic number tells us the number of
protons and neutrons
neutrons
electrons in the valence shell
protons
3
Power is
the electrical energy stored in electric charges
the electrical energy used by electrical devices over time
a coulomb per second
a joule per coulomb
4
A series circuit has a
battery, wires, switch, load & two paths for current to flow
battery, wires, switch & two paths for current to flow
battery, wires, switch & one path for current to flow
battery, wires, switch, load & one path for current to flow
5
Which of the following would you consider to be a load in a circuit?
battery
voltmeter
switch
lamp
6
Which of the following is a list of characteristic physical properties?
malleability, conductivity, and flammability
colour, boiling point, and reactivity
acidity, lustre, viscosity
density, melting point, and freezing point
7
Which definition is correct?
A habitat describes the role of an organism in its ecosystem
A population can contain more than one species
A community refers to a single species
An ecosystem includes both biotic and abiotic features
8
An electron
carries a - charge and is located in the nucleus
carries a - charge and is very small compared to the proton
carries no charge and orbits the nucleus
carries a + charge and is very small compared to the neutron
9
Which of the following is true according to the particle theory of matter?
Particles of matter never move
Only particles of liquids and gases move
Al particles of matter move
Only particles of solids move
10
Which of the following groups of elements is the least reactive?
halogens
alkaline earth metals
noble gases
alkali metals
11
Loads connected in series
do not affect the total resistance of the circuit
all of the above
decrease the total resistance of the circuit
increase the total resistance of the circuit
12
This term refers to a system capable of continuing over long periods of time with little change
community
ecosystem
sustainable
trophic
13
Which term best describes a species that no longer exists in a particular region?
exterminated
extinct
extirpated
expired
14
Which of the following includes only abiotic features?
air, water, animal waste, soil
air, water, microorganisms, grass
grass, deer, air, water
temperature, wind, light, water
15
Which of the following spheres includes all life on Earth?
biosphere
atmosphere
hydrosphere
lithosphere
16
Which groups of elements belongs in the alkaline earth metal family?
Mg, Ca, Sr
Li, Na, K
O, S, Se
Li, Be, B
17
Which of the following sets of materials consists of good electrical conductors?
plastic, wood, paper
platinum, rubber, ebonite
copper, aluminum, nickel
porcelain, wax, carbon
18
The law of electric charges describes how
like charges attract each other
unlike charges repel each other
some materials are conductors, while others are insulators
like charges repel each other
19
What name would be given to an organism that only eats meat?
omnivore
herbivore
carnivore
decomposer
20
When two species interact and both benefit, it is called
parasitism
competition
commensalism
mutualism
21
Electrostatic painting works because
the paint is difficult to charge, while the object is not
none of the above
the paint is easily charged, while the object is not
the paint and the object have opposite charges
22
From his gold foil experiment, Ernest Rutherford theorized that the atom
consists of a dense central nucleus containing protons
is mostly empty space with - charges evenly distributed
consists of a dense central nucleus containing electrons
is mostly empty space with + charges evenly distributed
23
The identity of an element is determined by
the number of electron orbits in the atom
the mass of the atom
the number of neutrons in the atom
the number of protons in the atom
24
The process of cellular respiration
stores energy and gives off carbon dioxide
releases energy from food using carbon dioxide
uses sunlight to make food
releases energy from food using oxygen

Grade 9 Science Review Flashcards | StudBud