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Sample Practice Test Questions
Generally, an atom has __________ negative electrons orbiting the nucleus as it does positive protons inside.
equal numbers of
An electron is a subatomic particle that orbits the nucleus of an atom. It carries a negative electric charge. Generally, an atom has the same number of negative electrons orbiting the nucleus as it does positive protons inside.
Food is mixed with gastric acid and pepsin in the __________ to help break down protein.
stomach
Food is mixed with gastric acid and pepsin in the stomach to help break down protein.
This circuit diagram represents a(n):
parallel circuit
In a parallel circuit, each load occupies a separate parallel path in the circuit and the input voltage is fully applied to each path. Unlike a series circuit where current (I) is the same at all points in the circuit, in a parallel circuit, voltage (V) is the same across each parallel branch of the circuit but current differs in each branch depending on the load (resistance) present.
When using a hacksaw, blades with __________ teeth are more appropriate for cutting thinner materials.
more
A hacksaw has replaceable blades and is used to cut metal. The blade type is chosen based on the material that is to be cut. Blades with larger numbers of teeth per inch are more appropriate for cutting thinner materials.
Which of the following is not a type of electric-arc welding?
oxyacetylene
Welding is a high-temperature process that involves melting the base metals in the objects to be joined to fuse them together. A filler metal is used to provide additional material to make up a joint that, depending on the weld type, can be stronger than the base materials alone. Oxyacetylene welding is a welding process that uses a torch fueled with oxygen and acetylene gases. Electric-arc welding utlizes electric current in a safer welding process (it doesn't involve burning explosive gases) that enables a wide variety of specialized applications like stick, MIG (metal inert gas), and TIG (tungsten inert gas) welding.
The conductivity of an element depends on how many electrons occupy which electron shell?
outer
All electricity is the movement of electrons which are subatomic particles that orbit the nucleus of an atom. Electrons occupy various energy levels called shells and how well an element enables the flow of electrons depends on how many electrons occupy its outer (valence) electron shell.
Tertiary consumers eat which of the following?
primary and secondary consumers
Tertiary consumers eat primary consumers and secondary consumers and are typically carnivorous predators. Tertiary consumers may also be omnivores. Examples include wolves, sharks, and human beings.
Piston rings are responsible for which of the following?
regulating oil distribution inside the cylinder
Cylinders act as a guide for the pistons that translate the heat energy of combustion into the mechanical energy necessary to move a vehicle. Piston rings seal the piston to the cylinder to contain combustion gases and also regulate the oil distribution between the piston and cylinder wall. A cylinder head closes in the top of the cylinder forming the combustion chamber which is sealed by a head gasket (head). The head provides space for air and fuel intake valves, exhaust valves, and mounts for spark plugs and fuel injectors.
Solve for b:
b2 + 6b - 13 = -b + 5
The first step to solve a quadratic expression that's not set to zero is to solve the equation so that it is set to zero:
b2 + 6b - 13 = -b + 5
b2 + 6b - 13 - 5 = -b
b2 + 6b + b - 18 = 0
b2 + 7b - 18 = 0
Next, factor the quadratic equation:
b2 + 7b - 18 = 0
(b - 2)(b + 9) = 0
For this expression to be true, the left side of the expression must equal zero. Therefore, either (b - 2) or (b + 9) must equal zero:
If (b - 2) = 0, b must equal 2
If (b + 9) = 0, b must equal -9
So the solution is that b = 2 or -9