Q. According to Ohm's Law, if the resistance in a circuit is doubled while keeping the voltage constant, what happens to the current?
A.
It doubles
B.
It halves
C.
It remains the same
D.
It becomes zero
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Solution
According to Ohm's Law, if resistance is doubled while voltage remains constant, the current will be halved.
Correct Answer:
B
— It halves
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Q. For a FET, what is the effect of increasing gate voltage on the drain current?
A.
Drain current decreases
B.
Drain current remains constant
C.
Drain current increases
D.
Drain current becomes zero
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Solution
Increasing the gate voltage in a FET typically increases the drain current, following the principles of Ohm's Law.
Correct Answer:
C
— Drain current increases
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Q. For a parallel circuit with two identical resistors, the total current is:
A.
Half of the current through one resistor
B.
Equal to the current through one resistor
C.
Twice the current through one resistor
D.
Zero
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Solution
In a parallel circuit with two identical resistors, the total current is twice the current through one resistor, as each resistor carries the same current.
Correct Answer:
C
— Twice the current through one resistor
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Q. How can ADO.NET handle concurrency when working with XML data?
A.
By using optimistic concurrency control
B.
By locking the XML file during access
C.
By using a transaction log
D.
By serializing all access to the XML data
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Solution
ADO.NET can handle concurrency using optimistic concurrency control, which allows multiple users to access the data without locking it.
Correct Answer:
A
— By using optimistic concurrency control
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Q. How does a switch handle VLAN tagging?
A.
By using MAC addresses
B.
By using IP addresses
C.
By using 802.1Q tags
D.
By using ARP requests
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Solution
Switches use 802.1Q tags to identify VLANs, allowing them to properly forward frames to the correct VLAN.
Correct Answer:
C
— By using 802.1Q tags
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Q. How does increasing resistance in an RC circuit affect the time response?
A.
Increases time constant
B.
Decreases time constant
C.
No effect
D.
Increases voltage
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Solution
Increasing resistance in an RC circuit increases the time constant (τ = R*C), resulting in a slower time response.
Correct Answer:
A
— Increases time constant
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Q. How does IPv6 handle packet fragmentation?
A.
Only the sender can fragment packets
B.
Intermediate routers can fragment packets
C.
Fragmentation is not allowed in IPv6
D.
Fragmentation is handled by NAT
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Solution
In IPv6, only the sender is responsible for fragmenting packets, as routers do not perform fragmentation.
Correct Answer:
A
— Only the sender can fragment packets
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Q. How does IPv6 handle packet fragmentation?
A.
Only the sender can fragment packets
B.
Intermediate routers can fragment packets
C.
Fragmentation is not allowed in IPv6
D.
Fragmentation is handled by NAT
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Solution
In IPv6, only the sender is responsible for fragmenting packets, as routers do not perform fragmentation.
Correct Answer:
A
— Only the sender can fragment packets
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Q. How does IPv6 handle packet fragmentation?
A.
Only the sender can fragment packets
B.
Intermediate routers can fragment packets
C.
Fragmentation is not allowed in IPv6
D.
Fragmentation is handled by NAT
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Solution
In IPv6, only the sender is responsible for fragmenting packets, as routers do not perform fragmentation.
Correct Answer:
A
— Only the sender can fragment packets
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Q. How does NAT affect the use of IPsec?
A.
It has no effect on IPsec
B.
It can break IPsec connections
C.
It enhances IPsec security
D.
It simplifies IPsec configuration
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Solution
NAT can break IPsec connections because it modifies packet headers, which can interfere with the integrity checks performed by IPsec.
Correct Answer:
B
— It can break IPsec connections
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Q. How does temperature affect the performance of a diode in a series-parallel circuit?
A.
Increases forward voltage drop
B.
Decreases reverse leakage current
C.
Increases reverse breakdown voltage
D.
Decreases forward current
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Solution
As temperature increases, the forward voltage drop of a diode typically increases, affecting its performance.
Correct Answer:
A
— Increases forward voltage drop
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Q. How does the current through each component in a parallel circuit relate to the total current?
A.
It is equal to the total current
B.
It is less than the total current
C.
It is greater than the total current
D.
It is independent of the total current
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Solution
In a parallel circuit, the current through each component is less than the total current, as the total current is the sum of the currents through each branch.
Correct Answer:
B
— It is less than the total current
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Q. How does the time response of an RL circuit differ from that of an RC circuit?
A.
RL is faster than RC
B.
RC is faster than RL
C.
Both are the same
D.
Depends on values of R and L
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Solution
Typically, RL circuits respond faster than RC circuits due to the nature of inductance versus capacitance.
Correct Answer:
A
— RL is faster than RC
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Q. How does the total resistance change in a series-parallel circuit when more resistors are added in parallel?
A.
Total resistance increases
B.
Total resistance decreases
C.
Total resistance remains the same
D.
Total resistance becomes infinite
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Solution
Adding more resistors in parallel decreases the total resistance of the circuit.
Correct Answer:
B
— Total resistance decreases
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Q. How many 16-bit timers/counters are available in the 8051 microcontroller?
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Solution
The 8051 microcontroller has 2 available 16-bit timers/counters.
Correct Answer:
B
— 2
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Q. How many 8-bit registers does the 8051 microcontroller have?
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Solution
The 8051 microcontroller has 32 general-purpose 8-bit registers.
Correct Answer:
C
— 32
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Q. How many bits are in a byte?
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Solution
A byte consists of 8 bits.
Correct Answer:
B
— 8
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Q. How many external interrupts does the 8051 support?
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Solution
The 8051 microcontroller supports 2 external interrupts.
Correct Answer:
B
— 2
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Q. How many inputs can an Ex-OR gate have?
A.
1
B.
2
C.
3
D.
Any number
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Solution
An Ex-OR gate can have any number of inputs, but it is commonly used with 2 inputs.
Correct Answer:
D
— Any number
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Q. How many outputs does an 8-to-1 multiplexer have?
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Solution
An 8-to-1 multiplexer has 1 output, which is selected from 8 different input lines.
Correct Answer:
A
— 1
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Q. How many select lines are needed for a 16-to-1 multiplexer?
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Solution
A 16-to-1 multiplexer requires 4 select lines because 2^4 = 16.
Correct Answer:
C
— 4
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Q. How many states does a 3-bit counter have?
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Solution
A 3-bit counter can represent 2^3 = 8 different states.
Correct Answer:
C
— 8
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Q. How many subnets can be created from a Class C network using a /28 subnet mask?
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Solution
A /28 subnet mask allows for 16 subnets (2^(28-24)), as Class C networks have a default mask of /24.
Correct Answer:
C
— 16
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Q. If A = 1 and B = 0, what is the output of A XOR B?
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Solution
The output of A XOR B is 1 when A = 1 and B = 0.
Correct Answer:
B
— 1
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Q. If a diode is forward-biased, what is the expected behavior according to Ohm's Law?
A.
It behaves like an open circuit
B.
It behaves like a short circuit
C.
It has infinite resistance
D.
It has zero voltage drop
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Solution
When a diode is forward-biased, it allows current to flow, behaving like a short circuit, which means it has very low resistance.
Correct Answer:
B
— It behaves like a short circuit
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Q. If A is true and B is true, what is the output of A OR B?
A.
True
B.
False
C.
1
D.
0
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Solution
An OR gate outputs true if at least one input is true; since both are true, the output is true.
Correct Answer:
A
— True
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Q. If a network has a subnet mask of /22, how many hosts can it support?
A.
1022
B.
1024
C.
2046
D.
2048
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Solution
A /22 subnet mask allows for 2^(32-22) = 1024 total addresses, minus 2 for network and broadcast addresses, resulting in 1022 usable hosts.
Correct Answer:
C
— 2046
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Q. If A=0 and B=1, what is the output of an Ex-NOR gate?
A.
1
B.
0
C.
Undefined
D.
Both 0 and 1
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Solution
The Ex-NOR gate outputs 0 when the inputs are different (A=0, B=1).
Correct Answer:
B
— 0
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Q. If two resistors are connected in parallel, how do you calculate the total resistance?
A.
R_total = R1 + R2
B.
R_total = 1 / (1/R1 + 1/R2)
C.
R_total = R1 * R2
D.
R_total = R1 - R2
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Solution
The total resistance in a parallel circuit is calculated using the formula R_total = 1 / (1/R1 + 1/R2).
Correct Answer:
B
— R_total = 1 / (1/R1 + 1/R2)
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Q. If two resistors are connected in parallel, the total resistance is:
A.
Greater than the smallest resistor
B.
Equal to the smallest resistor
C.
Less than the smallest resistor
D.
Equal to the sum of the resistances
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Solution
The total resistance in a parallel circuit is always less than the smallest resistor due to the formula 1/R_total = 1/R1 + 1/R2.
Correct Answer:
C
— Less than the smallest resistor
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