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Sample Practice Test Questions
Solve for c:
c2 - 5c - 6 = 0
The first step to solve a quadratic equation that's set to zero is to factor the quadratic equation:
c2 - 5c - 6 = 0
(c + 1)(c - 6) = 0
For this expression to be true, the left side of the expression must equal zero. Therefore, either (c + 1) or (c - 6) must equal zero:
If (c + 1) = 0, c must equal -1
If (c - 6) = 0, c must equal 6
So the solution is that c = -1 or 6
Molecules and atoms that are inputs to a chemical reaction are known as which of the following?
reactants
During a chemical reaction molecules and atoms (reactants) are rearranged into new combinations that result in new kinds of atoms or molecules (products).
The fuel injector is regulated by the __________ which is the main computer that controls engine and transmission functions.
powertrain control module
The fuel injector sprays fuel into the air stream that's being fed into the cylinder head via the intake valve. The timing and amount of fuel are regulated by the powertrain control module (PCM) which is the main computer that controls engine and transmission functions.
Which of the following is metamorphic rock?
marble
The Earth's rocks fall into three categories based on how they're formed. Igneous rock (granite, basalt, obsidian) is formed from the hardening of molten rock (lava), sedimentary rock (shale, sandstone, coal) is formed by the gradual despositing and cementing of rock and other debris, and metamorphic rock (marble, slate, quartzite) which is formed when existing rock is altered though pressure, temperature, or chemical processes.
Which types of triangles will always have at least two sides of equal length?
equilateral and isosceles
An isosceles triangle has two sides of equal length. An equilateral triangle has three sides of equal length. In a right triangle, two sides meet at a right angle.
Specific gravity is a comparison of the density of an object with the density of:
water
Specific gravity is the ratio of the density of equal volumes of a substance and water and is measured by a hyrdometer.
Which engine stroke starts with the piston at top dead center?
intake stroke
The four-stroke piston cycle of internal combustion engines starts with the piston at top of the cylinder head (top dead center or TDC) during the intake stroke. The piston moves downward in the cylinder creating a vacuum that pulls an air-fuel mix into the combustion chamber through the now open intake valve.
In household electrical wiring, which color of insulation indicates the 'hot' wire?
black
In the NM cable used for wiring homes, each cable has three wires inside a sheath with each wire covered in a different color of insulation to indicate its type. The wire with the black insulation is the 'hot' wire, white is the neutral wire, and the ground wire is either covered in green insulation or left bare.