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Sample Practice Test Questions
Electrical power is measured in:
watts
Electrical power is measured in watts (W) and is calculated by multiplying the voltage (V) applied to a circuit by the resulting current (I) that flows in the circuit: P = IV. In addition to measuring production capacity, power also measures the rate of energy consumption and many loads are rated for their consumption capacity. For example, a 60W lightbulb utilizes 60W of energy to produce the equivalent of 60W of heat and light energy.
When compared to drilling, boring makes __________ holes.
larger
Drilling is the process of making small holes in wood or metal while boring is the process of making larger holes.
Solve for a:
a2 + 6a - 13 = -a + 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:
a2 + 6a - 13 = -a + 5
a2 + 6a - 13 - 5 = -a
a2 + 6a + a - 18 = 0
a2 + 7a - 18 = 0
Next, factor the quadratic equation:
a2 + 7a - 18 = 0
(a - 2)(a + 9) = 0
For this expression to be true, the left side of the expression must equal zero. Therefore, either (a - 2) or (a + 9) must equal zero:
If (a - 2) = 0, a must equal 2
If (a + 9) = 0, a must equal -9
So the solution is that a = 2 or -9
The crust and upper mantle of the earth is called the:
lithosphere
The biosphere is the global ecological system integrating all living beings and their relationships. This includes their interactions with the lithosphere (the rigid outer part of the earth, consisting of the crust and upper mantle), hydrosphere (all surface water), and atmosphere (the envelope of gases surrounding the planet).
What is \( \frac{1}{8} \) x \( \frac{1}{5} \)?
To multiply fractions, multiply the numerators together and then multiply the denominators together:
\( \frac{1}{8} \) x \( \frac{1}{5} \) = \( \frac{1 x 1}{8 x 5} \) = \( \frac{1}{40} \) = \(\frac{1}{40}\)
In a eukaryotic cell, which organelles deal with proteins?
all of these deal with proteins
The nucleus of a eukaryotic cell contains the genetic material of the cell and is surrounded by cytoplasm which contains many organelles. Ribosomes produce proteins, endoplasmic reticulum helps synthesize proteins and fats, and Golgi apparatus prepares proteins for use.
Which of the following is not an advantage that disc brakes have over drum brakes?
use less brake fluid
Brakes utlize friction to slow vehicle tires. Drum brakes employ a cast iron drum that roates with the vehicle axle. When hydraulic pressure is applied to the brake assemblies at the wheels, internal pistons expand and push brake shoes outward into contact with the brake drum slowing the rotation of the axle. More powerful disc brakes operate by pinching a rotating disc betweeen two brake pads and allow for a larger surface area to contact the disc, provide more force, and are more easily cooled.
Which of the following represents how much two materials resist sliding across each other?
coefficient of friction
Coefficient of friction (μ) represents how much two materials resist sliding across each other. Smooth surfaces like ice have low coefficients of friction while rough surfaces like concrete have high μ.
Convert x-3 to remove the negative exponent.
To convert a negative exponent to a positive exponent, calculate the positive exponent then take the reciprocal.