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Electronics Information - ASVAB (full) test 1: Which of the following symbols represents a diode? A. 1 B. 2 C. 3 D. 4

B. 2B. Symbol 2 represents a diode.
Electronics Information - ASVAB (full) test2: Electronic current is measured inA. farads.B. volts.C. amperes.D. ohms.
C. amperes.C. Electronic current is measured in amperes. Capacitance is measured in farads. Voltage difference is measured in volts. Resistors are measured in ohms.
Electronics Information - ASVAB (full) test3: The total resistance for this circuit if all resistors are 200 ohms isA. 100 ohms.B. 200 ohms.C. 150 ohms.D. 400 ohms.
A. 100 ohms.A. Total resistance for parallel resistors is ??
Electronics Information - ASVAB (full) test4: For the lamp to be turned on in the following circuitA. switch 1only should be closed.B. switch 2 only should be closed.C. switches 1 and 2 only should be closed.D. all the switches must be closed.
C. switches 1 and 2 only should be closed.C. Switch 1 and switch 2 only should be closed. Switch 3 must be opened; otherwise, it will cause a short circuit.
Electronics Information - ASVAB (full) test5: A voltmeter is a device used for measuringA. electrical current.B. electrical charge.C. energy.D. difference in voltage.
D. difference in voltage.D. A voltmeter is a device used to measure the difference in voltage. An ammeter is used to measure electrical current. Electrical charge or energy cannot be measured by a voltmeter.
Electronics Information - ASVAB (full) test6: Leather gloves must be used whenA. working with low-power transistors.B. working with live high-voltage devices.C. testing low-power DC circuits.D. designing a low-power circuit.
B. working with live high-voltage devices.B. Leather gloves withstand high voltage.
Electronics Information - ASVAB (full) test7: The frequency of this signal isA. 100 Hz.B. 10 Hz.C. 5 Hz.D. 1 Hz.
C. 5 Hz.C. Frequency of a wave is given as ?.
Electronics Information - ASVAB (full) test8: An AM radio signal isA. amplitude modulated.B. frequency modulated.C. phase modulated.D. DC modulated.
A. amplitude modulated.A. An AM modulated signal is an amplitude modulated signal. FM signals are frequency modulated signals. PSK signals are phase modulated signals. DC cannot be used for modulation.
Electronics Information - ASVAB (full) test9: The reading of the ammeter in this circuit isA. 10:00 AMB. 5:00 AMC. 1:00 AMD. 2:00 AM
C. 1:00 AMC. The ammeter in the circuit reads the value of the current flowing in the resistor. The current flowing is calculated as V/R=10/10=1A.
Electronics Information - ASVAB (full) test10: In order to protect an electric circuit, the following component can be used:A. a fuseB. a capacitorC. an inductorD. an ammeter
A. a fuseA. In order to protect an electric circuit, a fuse can be used. Once the current rating is higher than the fuse rating, the fuse will break, preventing the flow of current.
Electronics Information - ASVAB (full) test11: Which of these symbols represents a bipolar junction transistor (BJT)?A. 1B. 2C. 3D. 4
C. 3C. Symbol 3 represents a bipolar junction transistor (BJT).

Electronics Information - ASVAB (full) test 12: A signal is transmitted wirelessly by carrying it on A. a square wave. B. a DC signal. C. a triangular wave. D. a high-frequency sinusoidal wave.

D. a high-frequency sinusoidal wave.D. A signal is transmitted by being carried on a high frequency sinusoidal signal called a carrier signal.
Electronics Information - ASVAB (full) test13: The signal s(t) = 10 sin (120pt) has the following amplitude and frequency, respectively:A. 5 V and 120 HzB. 10 V and 60 HzC. 10 V and 120 HzD. 5 V and 60 Hz
B. 10 V and 60 HzB. The signal s(t) can be written in the form s(t) = amplitude × sin(2pft), so that the amplitude is 10 V and the frequency is 60 Hz.
Electronics Information - ASVAB (full) test14: The reading of the voltmeter in this circuit isA. 5 VB. 10 VC. 0 VD. 2.5 V
C. 0 VC. Since all of the resistors are equal in value, then the currents in both branches of the circuit are equal. This makes the voltage difference between the leads of the voltmeter equal to zero.
Electronics Information - ASVAB (full) test15: An ohmmeter is a device used to measureA. resistance.B. voltage.C. power.D. current.
A. resistance.A. An ohmmeter is a device used to measure resistance. A voltmeter is used to measure a voltage difference. A wattmeter is used to measure power, and an ammeter is used to measure current.
Electronics Information - ASVAB (full) test16: A certain signal is carried on a radio signal by using the following electronic component:A. resistorB. mixerC. capacitorD. on-off switch
B. mixerB. Signals are carried on other high frequency signals by frequency mixers.
Electronics Information - ASVAB (full) test17: In a diode (PN Junction), the current flowsA. from anode to cathode.B. from cathode to anode.C. in both directions.D. when voltage is below threshold.
A. from anode to cathode.A. A diode permits the flow of the current in one direction only: from the anode to the cathode, when the voltage applied is greater than the threshold level.
Electronics Information - ASVAB (full) test18: A component of a parts list has the following specifications: "10 mH." The component specified is aA. capacitor.B. transistor.C. coil.D. resistor.
C. coil.C. A coil inductance is measured in henrys. Capacitance is measured in farads. Transistors have numbers to identify them. Resistance is measured in ohms.
Electronics Information - ASVAB (full) test19: Electronic devices are grounded toA. reduce the cost.B. protect the user.C. reduce the power dissipation.D. enhance performance.
B. protect the user.B. Electronic devices are grounded to protect the user from an electric shock.
Electronics Information - ASVAB (full) test20: The power dissipated across the resistors in the following circuit isA. 0.3 watt.B. 0.5 watt.C. 1.0 watt.D. 1.5 watt.
A. 0.3 watt.A. Power dissipated in the circuit can be calculated as ?.
Mechanical Comprehension - ASVAB (full) test1: A stone is tied to the end of a string and swings in a circular motion. If the speed of the stone is tripled, the centripetal force of the stone will becomeA. 3 times as great.B. 1/3 as much.C. 9 times as great.D. 1/9 as much.
C. 9 times as great.C. The centripetal force of the stone is proportional to the square of the velocity.
Mechanical Comprehension - ASVAB (full) test2: Which of the following units measures the weight of a body?A. poundB. NewtonC. kilogramD. kg.m/s2
B. NewtonB. The weight of a body is a force, and newton is the unit of force.
Mechanical Comprehension - ASVAB (full) test3: The joule is a unit ofA. work only.B. kinetic energy only.C. potential energy only.D. heat.
D. heat.D. The joule is the unit of work, kinetic energy, potential energy, and heat.
Mechanical Comprehension - ASVAB (full) test4: Two objects with different weights are dropped at the same moment from the top of the Leaning Tower of Pisa.A. Both objects hit the ground at the same time.B. The heavier object hits the ground first.C. The heavier object hits the ground last
A. Both objects hit the ground at the same time.A. The travel time depends on the height above ground and the acceleration of gravity, both of which are the same for both objects.
Mechanical Comprehension - ASVAB (full) test5: The quantity 2 m/s2 is a measure ofA. speed.B. acceleration.C. velocity.D. metric volume.
B. acceleration.B. The quantity 2 m/s2 can be thought of as 2 m/s per second; that is, speed per unit time, or acceleration.
Mechanical Comprehension - ASVAB (full) test6: For a car moving around a circular track at a constant speed, the acceleration isA. away from the center of the circle.B. towards the center of the circle.C. in the direction of motion.D. opposite to the direction of motion.
B. towards the center of the circle.B. From Newton's second law of motion, the centripetal force, or the inward force necessary to maintain uniform circular motion, is the product of mass and centripetal acceleration.
Mechanical Comprehension - ASVAB (full) test7: A ball thrown vertically upward has an initial potential energy of http://www.flashcardexchange.com/mycards/add/837691100 J and an initial kinetic energy of 700 J. At the top of the trajectory its energy in joules isA. 100B. 700C. 800D. 1,000.00
C. 800C. At the top of the trajectory the ball stops and all the kinetic energy has already been converted to potential energy. Thus the total energy is the sum of 100 and 700, or 800 J.
Mechanical Comprehension - ASVAB (full) test8: A simple pendulum has a frequency of oscillation f. In order to double f, the length of the pendulum should beA. increased by a factor of 2.B. decreased by a factor of 2.C. increased by a factor of 4.D. decreased by a factor of 4.
D. decreased by a factor of 4.D. Since the frequency of oscillation is inversely proportional to the square root of the length of the pendulum, the length has to be decreased by a factor of 4 for the frequency to be doubled.
Mechanical Comprehension - ASVAB (full) test9: The velocity of a baseball 4 seconds after it is thrown vertically upward with a speed of 32.1 m/s isA. -7.2 m/s.B. 71.2 m/s.C. 7.20 m/s.D. 14.6 m/s.
A. -7.2 m/s.A. The final velocity is the initial velocity minus four times the acceleration of gravity (9.8 m/s) or -7.14 (about 7.2) m/s
Mechanical Comprehension - ASVAB (full) test10: In order for a volleyball player to jump vertically upward a distance of 0.8 meters, his initial velocity must beA. 3.92 m/s.B. 1.96 m/s.C. 4.27 m/s.D. 2.15 m/s.
A. 3.92 m/s.A. Using the expressions s=vot +1/2at2 and vf = vo + at , you obtain = 0.4 s and vo = 3.92 m/s.
Mechanical Comprehension - ASVAB (full) test11: The graph of velocity versus time for an object with a constant negative acceleration would beA. a straight line with a positive slope.B. a straight line with a negative slope.C. a line curving upward with a positive slope.D. a line curving downward with a negative slope.
B. a straight line with a negative slope.B. Since acceleration is the time derivative of the velocity, the slope has to be constant and must also be negative since the acceleration is constant and negative.
Mechanical Comprehension - ASVAB (full) test12: The torque required to loosen a nut that holds a wheel on a car has a magnitude of 56 newton-meters. If a 0.35-meter lug wrench is used to loosen the nut when the angle of the wrench is 56°, the force that must be exerted at the end of the wrench isA. 200 N.B. 286 N.C. 143 N.D. 100 N.
B. 286 N.B. Since the torque T = Fd cos q where F is the force, d is the arm, and q is the angle between the force and arm, then you can solve for F to obtain 286 N.
Mechanical Comprehension - ASVAB (full) test13: In the spur gear arrangement shown in the figure, the ratio of the number of teeth on the output gear (No) to the number of teeth on the input gear (Ni) is 2. The speed ratio of the input and output gears isA. ½B. 2C. ¼D. 4
B. 2B. The speed ratio of input to output gears equals the mechanical advantage, which is the ratio No/Ni, or 2.
Mechanical Comprehension - ASVAB (full) test14: The gain in kinetic energy if a 400-kilogram satellite moves from a distance of 3 × 106 meters above the surface of the Earth to a point 1.50 × 106 meters above the surface is _______ J. The mass of the Earth is 5.98 × 1024 kilograms and the radius of the Earth is 6.37x106 meters.A. -1.7 × 109B. 3.25 × 109C. 1.7 × 109D. -3.25 × 109
B. 3.25 × 109B. K + (6.67 x 1011) (400) (5.96 x 10<24)/(6.37 x 106 + 3 x 106) = (6.67 x 10 -11) (400) (5.98 x 1024)/(6.37 x 106 + 1.5 x 106) or K = -3.25 x 109 J.
Mechanical Comprehension - ASVAB (full) test15: The speed of a baseball with a momentum of 5.8 kilograms m/s and a mass of 0.145 kilograms isA. 0.841 m/s.B. 1.19 m/s.C. 36.0 m/s.D. 40.0 m/s.
D. 40.0 m/s.D. Since the momentum P equals the mass m times the velocity v, it follows that v = P/m = 40.00 m/s.
Mechanical Comprehension - ASVAB (full) test16: A 0.24-kilogram glider moving with a velocity of 0.6 m/s collides with and sticks to a 0.26-kilogram glider moving with a velocity of 0.2 m/s. The final velocity v of the two gliders isA. 0.392 m/s.B. 0.184 m/s.C. 0.092 m/s.D. -0.092 m/s.
A. 0.392 m/s.A. Conservation of momentum requires that 0.24(0.6) + 0.26(0.2) = (0.24 + 0.26)v. Hence v = 0.392 m/s.
Mechanical Comprehension - ASVAB (full) test17: A massless, horizontal, rigid rod of length 3d is pivoted at a fixed point W, and two forces each of magnitude F are applied vertically upward as shown in the figure. In order to achieve rod equilibrium, a third vertical force of magnitude F is to be applied at which of the labeled points?A. X onlyB. W onlyC. V or X onlyD. X or Y only
C. V or X onlyC. For rod equilibrium the clockwise and counterclockwise torques must be equal, i.e., (F at V + F at V)(d) = (F at Y) (2d) or (F at V)D = (F at Y) (2d) - (F at X)D, which means that the third force can only be applied upward at V or downward at X.
Mechanical Comprehension - ASVAB (full) test18: Two balls of different masses are thrown vertically up from the same point and at the same time. The two balls will experience the same change inA. velocity.B. acceleration.C. momentum.D. kinetic energy.
A. velocity.A. Acceleration will be the same for both arrows. Momentum and energy are dependent on mass and will therefore be different. Only the change in velocity will be the same for both arrows.
Mechanical Comprehension - ASVAB (full) test19: An arrow is shot vertically up. As the arrow approaches its maximum altitude, the amount of work done against gravityA. increases.B. decreases.C. increases and then decreases.D. remains the same.
D. remains the same.D. The work done does not depend on time or path of travel since the deceleration of the arrow is constant.
Mechanical Comprehension - ASVAB (full) test20: The resistance of an object to a change of motion is determined by itsA. mass.B. weight.C. prior motion.D. distance of travel.
A. mass.A. The resistance to motion is a force that is determined by mass in accordance with Newton's second law.
Mechanical Comprehension - ASVAB (full) test21: Which of the following units is equivalent to the joule?A. kg.m/sB. kg.m/s2C. kg/s2D. kg.m2/s2
D. kg.m2/s2D. The joule is a unit of work that is force times distance. The force is mass times acceleration, which has the units of kg.m/s2. Hence, kg.m2/s2 is the product of the units of force and distance.
Mechanical Comprehension - ASVAB (full) test22: A 15-gram bullet is fired into a 3-kilogram block of plastic suspended from the ceiling by a string. As a result of the impact, the block with the bullet swings 12 centimeters above its original level. The velocity of the bullet as it strikes the block is nearlyA. 3.08 m/s.B. 30.8 m/s.C. 308 m/s.D. 3,080 m/s.
C. 308 m/s.C. Letting the masses of the bullet and block be m and M, and their initial velocities be u and U and their combined velocity be V, then the conversion from kinetic to potential energy requires that 1/2(m+M)V2=(m+M)gh, where h is the increment in height (12 cm). This leads to V = 1.533 m/s. The conservation of momentum requires that mu + MU = (m + M)V where U = 0. Hence, solving for u you obtain 308.258, or about 308 m/s.
Mechanical Comprehension - ASVAB (full) test23: An astronaut lands on Jupiter. Which of the following is true?A. Mass increases but weight decreases.B. Mass remains the same but weight increases.C. Mass decreases but weight remains the same.D. Both mass and weight decrease.
B. Mass remains the same but weight increases.B. Mass cannot change because of changes in the gravitational acceleration, but weight changes -- and in this case increases -- since the gravitational acceleration is higher
Mechanical Comprehension - ASVAB (full) test24: Ignoring air resistance, the acceleration of a person sliding down an inclined plane with a constant coefficient of kinetic frictionA. is constant.B. increases with time.C. decreases with time.D. depends on the mass and shape of the person.
A. is constant.A. The acceleration is the ratio of the force and the mass. The mass remains the same while the net force is set by the mass, acceleration of gravity, slope of the inclined plane, and the coefficient of kinetic friction, which are all constant. Thus the acceleration remains the same.

Mechanical Comprehension - ASVAB (full) test 25: A bicycle collides head-on with a large truck moving at the same speed. Following the collision, the bicycle and the truck stick together. Which of the two had the larger change in momentum? A. the bicycle B. the truck C. both had equal change D. none of the above

C. both had equal change C. Since the momentum is conserved, there is no change in speed due to the collision, and the momentum of both remains the same.