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Home » GAT Subject » Computer Science » Aptitude Test - 111
1.What command is used to compare the files?
A. ccp
B. du
C. cmp
D. ccp
2.What command is used to summarize the disk usage?
A. disk
B. du
C. fdisk
D. disk
3.What command is used to list the jobs currently in print queues?
A. lpq
B. lpr
C. lprm
D. lpq
4.Which of the following format of partition tables does Linux use?
A. Linux
B. BSD
C. UnixWare
D. Linux
5.Which of the following NIS clients returns the name of the NIS server used by the NIS client?
A. ypwhich
B. ypbind
C. ypcat
D. ypwhich
6.In an intrinsic semiconductor, the number of free electrons
A. Equals the number of holes
B. Is less than the number of holes
C. Is greater than the number of holes
D. Equals the number of holes
7.A device that converts mechanical into electrical energy is?
A. solar cell
B. thermocouple
C. chemical cell
D. solar cell
8.Which one of the following kinds of materials has the lowest permeability?
A. A diamagnetic material
B. A paramagnetic material
C. A feiTomagnetic material
D. A diamagnetic material
9.The total impedance of a parallel RLC circuit:
A. always increases as the applied frequency increases
B. is equal to the sum of the values of resistance, inductive reactance and capacitive reactance
C. always decreases as the applied frequency increases
D. always increases as the applied frequency increases
10.The rise time of a pulse waveform is the time required for the voltage to rise:
A. from zero to its rms value
B. from zero to its peak value
C. from 10% of the peak value to 70.7% of the peak value
D. from zero to its rms value
11.For a pure capacitor:
A. ac current and voltage are exactly in phase
B. ac current leads the voltage by 90 degree
C. ac current is converted to dc voltage
D. ac current and voltage are exactly in phase
12.The component that forms the electrical connection between the rotating coil of wire in a motor and the external source of electrical energy is called the:
A. rotor
B. armature
C. battery
D. rotor
13.In a pure inductor:
A. ac current leads the voltage by 90 degree
B. ac current and voltage are exactly in phase
C. ac current lags the voltage by 90 degree
D. ac current leads the voltage by 90 degree
14.Waveforms are graphs that show:
A. frequency on the vertical axis and amplitude on the horizontal axis
B. amplitude on the vertical axis and frequency on the horizontal axis
C. amplitude on the vertical axis and the passage of time on the horizontal axis
D. frequency on the vertical axis and amplitude on the horizontal axis
15.When the collector current increases, what does the current gain do?
A. decreases
B. stays the same
C. increases
D. decreases
16.How many types of flow are there in a semiconductor?
A. 0
B. 1
C. 2
D. 0
17.Which one of the following devices is most often used for measuring opposition to current flow in a circuit?
A. Ammeter
B. Voltmeter
C. Ohmmeter
D. Ammeter
18.What form of energy is used to maintain an imbalance of charges between the terminals of a battery?
A. Electronical energy
B. Mechanical energy
C. Chemical energy
D. Electronical energy
19.Which one of the following statements best applies to a parallel RLC circuit?
A. The voltage waveform for each component always has the same amplitude and phase as the applied voltage
B. The sum of the current is always less than the applied current
C. The current waveform for each component always has the same amplitude and phase as the applied current
D. The voltage waveform for each component always has the same amplitude and phase as the applied voltage
20.The equivalent of 1 micro A is:
A. 10000A
B. 1000 A
C. one-millionth of an ampere
D. 10000A
21.Which one of the following statements best describes magnetic hysteresis?
A. Hysteresis is the amount of magnetic flux that is not confined to the core material of an electromagnet
B. Hysteresis is most apparent when a steady amount of current is lowing through the coil of an electromagnet
C. Hysteresis is most apparent when the current through the coil of an electromagnet changes frequently
D. Hysteresis is the amount of magnetic flux that is not confined to the core material of an electromagnet
22.Which one of the following phrases best describes residual magnetism?
A. Magnetism that remains in the core of an electromagnet after the current through the coil is turned off
B. The force of attraction between the poles of a permanent and temporary magnetic field
C. The amount of magnetic flux that is not confined to the core material of an electromagnet
D. Magnetism that remains in the core of an electromagnet after the current through the coil is turned off
23.A transformer has a primary voltage of 120 V rms and a secondary voltage of 25 V rms. If the secondary current is 1A rms, what is the primary current?
A. 7.8 mA
B. 208 mA
C. 200 mA
D. 7.8 mA
24.Household light bulbs have a given power rating, and they operate at 120 V. Which one of the following equations most directly provides the current rating of these light bulbs?
A. P = I2R
B. P = IE
C. P = E2/R
D. P = I2R
25.Which one of the following phrases most accurately describes a purely inductive circuit?
A. Resistances provide the only opposition to current flow
B. Inductive reactance provides the only opposition to current flow
C. Combinations of resistance and inductive reactance provide any opposition to current flow
D. Resistances provide the only opposition to current flow
26.The knee voltage of a diode is approximately equal to the
A. Applied voltage
B. Barrier potential
C. Breakdown voltage
D. Applied voltage
27.A zener regulator has an input voltage from 15 to 20 V and a load current from 5 to 20 mA. If the zener voltage is 6.8 V, what value should the series resistor have?
A. 310 Ohm
B. 400 Ohm
C. 410 Ohm
D. 310 Ohm
28.The rms value of a sine waveform is:
A. the number of cycles completed in one second
B. the time required to complete one full cycle
C. equal to 0.707 times the peak amplitude
D. the number of cycles completed in one second
29.A high-pass filter:
A. passes lower-frequency signals and reduces higher-frequency signals
B. passes higher-frequency signals and reduces lower-frequency signals
C. has no effect on ac signals
D. passes lower-frequency signals and reduces higher-frequency signals
30.Which one of the following statements is true for the voltages in a series RC circuit?
A. The total voltage is equal to the sum of the voltages across the resistance and capacitance
B. The voltage always has the same amplitude and phase for every part of the circuit
C. The total voltage is less than the sum of the voltages across the resistance and capacitance
D. The total voltage is equal to the sum of the voltages across the resistance and capacitance
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