2684444
Descripción
Test por Maheen Zahid, actualizado hace más de 1 año
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Creado por Maheen Zahid
hace más de 9 años
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Pregunta 1
Pregunta
A chemical reaction takes place when water is put to a boil passing electricity through a heater immersed in the water.
Respuesta
- True
- False
Pregunta 2
Pregunta
during a chemical reaction, energy:
Respuesta
-
is taken in
-
is given out
-
remains the same
Pregunta 3
Pregunta
When reactants are mixed,energy is used for ______ the molecules of the reactants into ________
Respuesta
-
breaking up.....into atoms
-
combining...into compounds
-
absorbing....into atoms
Pregunta 4
Pregunta
the atoms ____ themselves to form the products
Respuesta
-
rearrange
-
recombine
-
break
-
divide
Pregunta 5
Pregunta
If the amount of energy required to break the atoms up is 250 and the the amount of energy released when atoms recombine is 300,what is the amount of energy exchanged with the surroundings?
Respuesta
-
50
-
550
-
300
-
250
Pregunta 6
Pregunta
A chemical reaction is used to describe a chemical equation
Respuesta
- True
- False
Pregunta 7
Pregunta
No atoms are created or destroyed in a chemical reaction
Respuesta
- True
- False
Pregunta 8
Pregunta
At room temperature gold is _____,water is _____ and oxygen is ________
Respuesta
-
solid...liquid...gas
-
gas...liquid...solid
-
liquid....gas...solid
-
liquid...solid...gas
Pregunta 9
Pregunta
Atoms and molecules are said to be in a constant______
Respuesta
-
motion
-
arrangement
-
order
-
state
Pregunta 10
Pregunta
in a solid the atoms are:
Respuesta
-
packed closely together in a regular pattern
-
move around eachother
-
held and spun around in fixed positions
-
have weak attractive forces
-
have strong attractive forces
-
have a definite shape and volume
-
does not have a fixed volume
Pregunta 11
Pregunta
If a solid is heated the particles_____________________________________________________
Respuesta
-
gain energy and start to vibrate more
-
slow down
-
break down
-
combine
Pregunta 12
Pregunta
in a liquid the atoms are arranged in a fixed pattern
Respuesta
- True
- False
Pregunta 13
Pregunta
liquids can flow because:
Respuesta
-
they have fixed atoms
-
they can move around one another
-
they are closely packed
-
they have strong attractive forces
Pregunta 14
Pregunta
in a gas the atoms are:
Respuesta
-
widely spaced and move freely
-
able to fill up any container quickly
-
slow
-
combined together
Pregunta 15
Pregunta
solid to gas is the process of ________
Respuesta
-
boiling
-
sublimation
-
freezing
Pregunta 16
Pregunta
electricity is produced by flow of
Respuesta
-
electric charges
-
electric current
-
atoms
-
energy
Pregunta 17
Pregunta
conventional current is the flow of electric charges from the _______ end to the ________ end
Respuesta
-
positive.....to negative
-
negative.....to positive
Pregunta 18
Pregunta
Electric current is defined as:
Respuesta
-
the rate of flow of electric charges
-
the rate of flow of electric current
-
the rate of flow of electricity
Pregunta 19
Pregunta
the SI unit for electricity is ampere (A)
Respuesta
- True
- False
Pregunta 20
Pregunta
electric currents are measured by
Respuesta
-
ammeters
-
voltmeters
-
generators
-
cellphones
Pregunta 21
Pregunta
Ammeters must be connected in parallel
Respuesta
- True
- False
Pregunta 22
Pregunta
ammeter may get damaged if
Respuesta
-
connected the other way round
-
connected in parallel
-
connected from positive to negative
-
connected in series
Pregunta 23
Pregunta
electric circuits can be divided into two main categories:
Respuesta
-
series and parallel
-
ammeter and voltmeter
-
electric charges and electric current
Pregunta 24
Pregunta
An electric circuit is a path along which electric charges move
Respuesta
- True
- False
Pregunta 25
Pregunta
A series circuit forms a double loop
Respuesta
- True
- False
Pregunta 26
Pregunta
the current flowing through each electrical component in a series circuit is _____
Respuesta
-
same
-
different
-
opposite
Pregunta 27
Pregunta
disadvantage of series circuit is that there is less current flowing in each branch rather than that flowing out of the circuit
Respuesta
- True
- False
Pregunta 28
Pregunta
what is a parallel circuit?
Respuesta
-
A circuit that splits into two or more branches
-
A circuit that forms a single loop
-
A circuit with multiple batteries
-
A colorful circuit with balloons
Pregunta 29
Pregunta
Advantage of Parallel circuit is that the current flowing through each component is same.
Respuesta
- True
- False
Pregunta 30
Pregunta
A source is
Respuesta
-
a battery
-
component from the where the current starts
-
wires and bulbs in a circuit are a part of the source
Pregunta 31
Pregunta
the force needed to push electric charges round a circuit is supplied by:
Respuesta
-
a battery
-
an electric cell
-
a bulb
-
a toy
Pregunta 32
Pregunta
the amount of energy supplied by a source of electrical energy to each unit of electric charge is called ________
Respuesta
-
voltage
-
power
-
Resistance
Pregunta 33
Pregunta
If more electric cells are connected in series,a ________ voltage will be obtained
Respuesta
-
higher
-
lower
-
decreased
Pregunta 34
Pregunta
Electrical energy is converted into light and heat when flowing through a bulb
Respuesta
- True
- False
Pregunta 35
Pregunta
SI unit of voltage is ______
Respuesta
-
volt (V)
-
Joules
-
ohm
Pregunta 36
Pregunta
The voltage of a source of electrical energy is called
Respuesta
-
electromotive force
-
potential difference
-
energy
-
cupcake
Pregunta 37
Pregunta
Resistors can only be added in series.
Respuesta
- True
- False
Pregunta 38
Pregunta
which of the following have heating elements inside them?
Respuesta
-
hair dryer
-
cellphone
-
cranes
-
toaster
-
iron
-
magnet
Pregunta 39
Pregunta
The heating element is usually made up of ________________
Respuesta
-
nichrome wire
-
conductor
-
plastic
-
coiled coil
Pregunta 40
Pregunta
In electro-plating the plating metal is connected to the __________ terminal
Respuesta
-
positive
-
negative
Pregunta 41
Pregunta
which of the following are uses of electromagnets
Respuesta
-
used in scrapyards
-
check thickness of paint in a car
-
televisions
-
kettle
-
remove splinters from body
Pregunta 42
Pregunta
improper use of electricity can result in:
Respuesta
-
electrocutions
-
electric fires
-
electric shocks
-
dehydration
-
high blood pressure
Pregunta 43
Pregunta
The consumer unit consists of damp conditions,main switch and electric bells.
Respuesta
- True
- False
Pregunta 44
Pregunta
some dangerous situations of using electricity are:
Respuesta
-
damp conditions
-
damaged insulation
-
over-loading
-
sleeping near it
-
sitting on it
Pregunta 45
Pregunta
If it takes a 4kW kettle 10 minutes to boil the water in it,how much energy is used?
Calculate the cost of electricity if each unit costs 21 cents.
Respuesta
-
2/3 kW and 14 cents
-
1/3 kW and 6 cents
-
1/2 kW and 21 cents
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