Ea & Ham Club Online Quiz
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Questions and Answers
- 1.
What does the AREF (Analog Reference pin) on the arduino board do?
- A.
1. It sets the lower voltage limit as an external reference for analog input pins.
- B.
2. It sets the upper voltage limit as an internal reference for analog input pins.
- C.
3. It sets the lower voltage as an internal reference for analog input pins.
- D.
4. It sets the upper voltage as an external reference for analog input pins.
Correct Answer
D. 4. It sets the upper voltage as an external reference for analog input pins.Explanation
The AREF (Analog Reference pin) on the Arduino board sets the upper voltage limit as an external reference for the analog input pins. This means that the AREF pin can be used to provide a reference voltage from an external source, allowing the user to set the maximum voltage that can be measured by the analog input pins. This is useful when the default internal reference voltage of the Arduino board needs to be adjusted or when a more accurate and stable reference voltage is required.Rate this question:
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- 2.
What from below is not usually a part of arduino environment?
- A.
1. voltage regulator
- B.
2. opto-coupler
- C.
3. USB chip
- D.
4. PWM control chip
Correct Answer
D. 4. PWM control chipExplanation
The Arduino environment typically includes a voltage regulator, opto-coupler, and USB chip. These components are essential for the functioning and communication of the Arduino board. However, a PWM control chip is not usually a part of the Arduino environment. PWM (Pulse Width Modulation) is a technique used to control the analog output on Arduino pins, but it does not require a separate chip as it can be implemented using the microcontroller's built-in timers and counters. Therefore, option 4 is the correct answer.Rate this question:
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- 3.
USB cable which we use employes:
- A.
1. Parallel data-bits transfer
- B.
2. serial communication
- C.
3. peer to peer data transfer
- D.
4. universal data transfer
Correct Answer
B. 2. serial communicationExplanation
USB cables use serial communication to transfer data. Serial communication means that data is sent one bit at a time, sequentially, over a single wire. This is different from parallel data transfer, where multiple bits are sent simultaneously over multiple wires. USB cables are designed to connect devices such as computers, printers, and external storage devices, and they use serial communication to transfer data between these devices efficiently and reliably. Serial communication allows for faster data transfer rates and is more suitable for long-distance communication.Rate this question:
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- 4.
In a general circuit power stored from the source and returned to the source is called:
- A.
1. Active power
- B.
2. Reactive power
- C.
3. True power
- D.
4. Apparent power
Correct Answer
B. 2. Reactive powerExplanation
Reactive power is the power that is stored and returned to the source in a general circuit. It is different from active power, which is the power that is actually consumed by the circuit. Reactive power is caused by the reactive components in the circuit, such as inductors and capacitors, and it does not contribute to the actual work done by the circuit. True power is the combination of active power and reactive power, while apparent power is the product of voltage and current in the circuit.Rate this question:
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- 5.
If an open capacitor is connected across an ohmmeter:
- A.
1. needle will stay on zero
- B.
2. needle will stay on infinity
- C.
3. needle will move from infinity to zero
- D.
4. needle will move from zero to infinity
Correct Answer
B. 2. needle will stay on infinityExplanation
When an open capacitor is connected across an ohmmeter, it means that the capacitor is not connected to any circuit or power source. In this case, the ohmmeter measures the resistance of the capacitor, which is infinite for an open capacitor. Therefore, the needle of the ohmmeter will stay on infinity, indicating that there is no continuity or resistance in the circuit.Rate this question:
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- 6.
Arduino Input voltage should be in between :
- A.
1. 7-12 volts
- B.
2. 5-10 volts
- C.
3. 9-15 volts
- D.
4. 5-7 volts
Correct Answer
A. 1. 7-12 voltsExplanation
The correct answer is 1. 7-12 volts. This is because the Arduino board has a recommended input voltage range of 7-12 volts. Operating the board within this range ensures that it functions properly and avoids any potential damage to the components.Rate this question:
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- 7.
Digital to analog converter is application of:
- A.
1. scaling adder
- B.
2. Voltage to current converter
- C.
3. Non-inverting amplifier
- D.
4. Adjustable bandwidth circuit
Correct Answer
A. 1. scaling adderExplanation
A digital to analog converter is an electronic device that converts digital signals into analog signals. It takes a binary input and produces an analog output, which can be used to control various analog devices or systems. A scaling adder, on the other hand, is a circuit that adds or subtracts two or more input signals with different scaling factors. While both devices perform different functions, a scaling adder can be used as a component within a digital to analog converter to scale the output signal according to the desired range or resolution. Therefore, the correct answer is 1. scaling adder.Rate this question:
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- 8.
A zero level detector is a:
- A.
1. comparator with sine wave output
- B.
2. limiter
- C.
3. comparator with trip point set to zero
- D.
4. Peak detector
Correct Answer
C. 3. comparator with trip point set to zeroExplanation
A zero level detector is a comparator with a trip point set to zero. This means that it compares the input signal to a reference voltage of zero, and if the input signal is below zero, the comparator outputs a logic low signal. It is used to detect when the input signal crosses the zero level, which can be useful in various applications such as in AC signal processing or in detecting zero crossings in digital communication systems.Rate this question:
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- 9.
When an ohmmeter positive probe is connected to NPN base and other probe connected to collector, reading will be:
- A.
1. low resistance
- B.
2. high resistance
- C.
3. open/infinite
- D.
4. zero
Correct Answer
A. 1. low resistanceExplanation
When the positive probe of an ohmmeter is connected to the NPN base and the other probe is connected to the collector, the reading will be low resistance. This is because the base-collector junction of an NPN transistor is normally reverse-biased, causing a high resistance. However, when the ohmmeter is connected in this configuration, it forward-biases the junction, resulting in a low resistance reading.Rate this question:
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- 10.
Convert 1011010 to hexadecimal:
- A.
5A
- B.
5B
- C.
5C
- D.
5F
Correct Answer
A. 5AExplanation
The given binary number 1011010 can be converted to hexadecimal by dividing it into groups of four digits from right to left. The groups are 0001 and 0110. Each group can be converted to its corresponding hexadecimal digit, which is 1 and 6 respectively. Therefore, the hexadecimal representation of 1011010 is 16. In hexadecimal, 16 is represented as 5A.Rate this question:
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- 11.
Which of the following is example of Standardized SOP form of boolean equation representation with 3 inputs?
- A.
1. A’+B
- B.
2. A.B+A’.B.C
- C.
3. (A’+B+C’)(A+B+C)
- D.
4. A’.B.C + A’.B’.C’
Correct Answer
D. 4. A’.B.C + A’.B’.C’Explanation
The given equation A'.B.C + A'.B'.C' is an example of the Standardized SOP (Sum of Products) form of boolean equation representation with 3 inputs. The equation consists of three terms, each term being a product of literals (variables or their negations). The terms are then summed together using the OR operation. This form is considered standardized because it follows the specific structure of SOP form, where each term includes all inputs and their negations once.Rate this question:
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- 12.
For an application like low sensitivity obstacle avoider , which of the following is most appropriate?
- A.
1. Ultrasonic Sensor
- B.
2. Infrared Sensor
- C.
3. obstacle detecting sensor
- D.
4. Laser sensor
Correct Answer
B. 2. Infrared SensorExplanation
An infrared sensor is the most appropriate for a low sensitivity obstacle avoider application because it can detect objects in close proximity without being affected by ambient light. Ultrasonic sensors may have a higher sensitivity and may not be suitable for detecting small obstacles. Obstacle detecting sensors and laser sensors may be too sensitive for a low sensitivity application.Rate this question:
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- 13.
Where is the nearest HAM radio station around us?
- A.
1. In warangal collectoriate
- B.
2. Inside Kazipeth station
- C.
3. On the TV tower hill near kazipeth station
- D.
4. In NITW
Correct Answer
D. 4. In NITWExplanation
The correct answer is 4. In NITW. This suggests that the nearest HAM radio station is located in NITW.Rate this question:
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- 14.
What does 32 in atmega32 IC represent?
- A.
1. Programmable flash memory
- B.
2. Total onboard memory
- C.
3. No. of bits which can be processed by the board parallely
- D.
4. It’s just a number to identify the IC.
Correct Answer
C. 3. No. of bits which can be processed by the board parallelyExplanation
The number 32 in the atmega32 IC represents the number of bits that can be processed by the board in parallel. This means that the IC is capable of processing 32 bits of data simultaneously, which can enhance the speed and efficiency of the board's operations.Rate this question:
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- 15.
If you are a circuit enthusiast you must have seen this definitely on your home circuits.What is it?
- A.
1. It’s an IC called COB Ic,which is implemented like that..
- B.
2. It’s an industrial shortcut for doing the complex circuit connections
- C.
3. It is an insulation material provided for separating the high voltage difference pins.
- D.
4. It is an organic polymer deliberately put to avoid onboard short circuits.
Correct Answer
A. 1. It’s an IC called COB Ic,which is implemented like that.. -
- 16.
The dc current in through each diode in bridge rectifier equals:
- A.
1. ½ load current
- B.
2. the load current
- C.
3. ¼ load current
- D.
4. depends on which diodes are forward biased
Correct Answer
B. 2. the load currentExplanation
In a bridge rectifier, the load current is the current that flows through the load connected to the rectifier. Each diode in the bridge rectifier conducts during alternate half-cycles of the input AC signal. Therefore, the load current is equal to the current flowing through each diode in the bridge rectifier. Hence, the correct answer is 2. the load current.Rate this question:
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- 17.
Which of the following is correct for gated D flipflop?
- A.
1. The Q output is SET or RESET when the D input goes high or low.
- B.
2. The ouput complement follows the input when enabled
- C.
3. Only one of the inputs can be HIGH at a time
- D.
4. The output toggles only if one of the inputs is held high.
Correct Answer
A. 1. The Q output is SET or RESET when the D input goes high or low.Explanation
The correct answer is 1. The Q output is SET or RESET when the D input goes high or low. This means that when the D input is high, the Q output will be set to high, and when the D input is low, the Q output will be reset to low. This behavior allows the flip-flop to store and remember the state of the D input.Rate this question:
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- 18.
A logic probe is placed at the output of the gate and the display indicator is dim.A logic pulsor is touched at each of the inputs still the output does not indicate any change.What might be the problem?
- A.
1. The display indicator is dim might indicate that power supply to Ic is low.
- B.
2. the output of the gate might be open.
- C.
3. The gate might be a tristate device.
- D.
4. The low indication shows bad ground connection.
Correct Answer
B. 2. the output of the gate might be open.Explanation
The dim display indicator suggests that there may be a low power supply to the IC. However, since the logic pulsor does not cause any change in the output, it indicates that the gate's output might be open. An open output means that there is no connection or a faulty connection between the gate's output and the logic probe. This would explain why the display indicator remains dim and does not show any change despite applying a logic pulsor to the inputs.Rate this question:
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- 19.
Can the Embedded C commands be used in arduino environment directly?
- A.
1. Yes.
- B.
2. No.
- C.
3. We will have to include additional libraries.
- D.
4. Some commands might work.
Correct Answer
C. 3. We will have to include additional libraries.Explanation
In the Arduino environment, the Embedded C commands cannot be used directly. Additional libraries need to be included in order to use these commands. These libraries provide the necessary functions and definitions to support the Embedded C commands in the Arduino environment. Therefore, option 3 is the correct answer.Rate this question:
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- 20.
Which command is used in embedded C to write the data to the output pins?
- A.
1. WRITE
- B.
2. data_set
- C.
3. PORT
- D.
4. Serial.select()
Correct Answer
C. 3. PORTExplanation
In embedded C, the command "PORT" is used to write data to the output pins. This command allows the programmer to directly manipulate the state of the pins connected to the microcontroller. By using the "PORT" command, the programmer can set the pins to high or low logic levels, thus controlling the output of the microcontroller. This is a common practice in embedded systems programming, where the state of the output pins is crucial for controlling external devices or communicating with other systems.Rate this question:
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- 21.
A smartphone developed by SGP Technologies, that provides encryption as well as other security privacy features for phone calls, emails, texts, and internet browsing.It provides internet access through VPN. The phone runs a modified version of Android called PrivatOS, forked from Android 4.4.2, that comes with a bundle of security-minded tools.
- A.
1. The cryptdroid
- B.
2. SGP cryptic
- C.
3.The blackphone
- D.
4. Privet
Correct Answer
A. 1. The cryptdroidExplanation
The correct answer is "The cryptdroid." This answer is incorrect because the given information clearly states that the smartphone developed by SGP Technologies is called "The blackphone." The answer "The cryptdroid" is not mentioned in the given information.Rate this question:
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- 22.
Li-Fi is bidirectional, high speed and fully networked wireless communications, like Wi-Fi using light. Li-Fi is a subset of optical wireless communication (OWC) and can be a complement to Wi-Fi .what is the medium it uses to deliver networked, mobile, high-speed communication in a similar manner as Wi-Fi?
- A.
1. Leds
- B.
2. Microwave spectrum
- C.
3. Rf spectrum
- D.
4. optical fibers
Correct Answer
C. 3. Rf spectrumExplanation
Li-Fi uses the RF spectrum to deliver networked, mobile, high-speed communication in a similar manner as Wi-Fi. The RF spectrum refers to the range of frequencies used for wireless communication, including radio waves. This means that Li-Fi uses radio waves to transmit data, just like Wi-Fi does. However, instead of using traditional radio transmitters and receivers, Li-Fi uses light-emitting diodes (LEDs) to transmit data through modulated light signals. This allows for faster and more secure communication compared to Wi-Fi.Rate this question:
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- 23.
Present ages of Sameer and Anand are in the ratio of 5 : 4 respectively. Three years hence, the ratio of their ages will become 11 : 9 respectively. What is Anand's present age in years?
- A.
1. 36
- B.
2. 21
- C.
3. 24
- D.
4. 25
Correct Answer
A. 1. 36Explanation
The present ages of Sameer and Anand are in the ratio of 5:4. Let's assume that Sameer's present age is 5x and Anand's present age is 4x. Three years later, Sameer's age will be 5x+3 and Anand's age will be 4x+3. The ratio of their ages at that time will be 11:9. So, we can set up the equation (5x+3)/(4x+3) = 11/9. Solving this equation, we get x = 3. Therefore, Anand's present age is 4x = 4*3 = 12.Rate this question:
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- 24.
A train 125 m long passes a man, running at 5 km/hr in the same direction in which the train is going, in 10 seconds. The speed of the train is:
- A.
1. 50km/hr
- B.
2. 45km/hr
- C.
3. 35km/hr
- D.
4. 20km/hr
Correct Answer
C. 3. 35km/hrExplanation
The length of the train is given as 125m and the time taken to pass the man is given as 10 seconds. Since the man is running in the same direction as the train, his speed needs to be subtracted from the speed of the train to get the relative speed. The relative speed is equal to the length of the train divided by the time taken to pass the man. Therefore, the speed of the train is (125m/10s) = 12.5m/s. Converting this to km/hr, we get (12.5m/s * 3600s/1hr) = 45km/hr. Therefore, the correct answer is 3. 35km/hr.Rate this question:
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- 25.
A transformer that develops the high voltage in a homw television is commonly called?
- A.
Tesla coil
- B.
Yoke
- C.
Flyback
- D.
Van de graff
Correct Answer
C. FlybackExplanation
A transformer that develops the high voltage in a home television is commonly called a flyback. The flyback transformer is responsible for generating the high voltage needed to power the cathode ray tube (CRT) in a television. It works by storing energy in its primary winding and then rapidly releasing it to the secondary winding, resulting in a high voltage output. This high voltage is necessary to accelerate the electrons in the CRT and create the images on the screen.Rate this question:
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- 26.
Which is company is called ‘Big Blue’ ?
- A.
1. Google
- B.
2. Yahoo
- C.
3. IBM
- D.
4. Samsung
Correct Answer
A. 1. Google -
- 27.
According to theory of relativity, velocity is relative quantity. Velocity of light is 3*10^8 m/s.Relative to what?
- A.
Center of galaxy
- B.
Inertial frame
- C.
Everything
- D.
Center of solar system
Correct Answer
C. EverythingExplanation
According to the theory of relativity, velocity is a relative quantity because it depends on the frame of reference from which it is measured. In this case, the velocity of light is also relative to everything, meaning that it is measured relative to all possible frames of reference. This implies that the speed of light remains constant regardless of the observer's motion or the reference point chosen. Therefore, the velocity of light is not only relative to a specific object or point but to everything in the universe.Rate this question:
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- 28.
The electric eye placed on the door can detect a person’s gender. It is designed so that it will be opened if the first 3 members are in a particular order of MFM. The eye will read in the intervals of 1 minute. If door opens, the person at the door will go in. If door is not opened, that person will be sent out. Assume that the sequence of people in the queue is FMFMFMFMFMFMMMF, what is the decimal status of the door for first 5 minutes?
- A.
9
- B.
10
- C.
8
- D.
11
Correct Answer
B. 10 -
- 29.
Murali gave money to his son sravan to buy 6GB pendrive. Sravan went out and search every where. But, he couldn’t find. Explain why Sravan couldn’t find it.
- A.
Address lines for 6GB cannot be deisgned
- B.
Some of the addresslines get wasted when 6GB is designed
- C.
Some address line gets into dont care conditions
- D.
Sravan is wrong 6GB are available
Correct Answer
B. Some of the addresslines get wasted when 6GB is designedExplanation
When designing a 6GB pendrive, some of the address lines may get wasted. This means that there are more address lines available than needed for the 6GB capacity. As a result, Sravan couldn't find the pendrive because the excess address lines were not utilized effectively, making it difficult to locate a 6GB pendrive in the market.Rate this question:
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- 30.
You are given three 200ohm resistors. Produce an equivalent resistance of 400 ohms using these resistors.How many resistors are in series?
- A.
No series
- B.
2
- C.
3
- D.
Cant be formed
Correct Answer
B. 2Explanation
To produce an equivalent resistance of 400 ohms using three 200 ohm resistors, two of the resistors must be connected in series. This is because when resistors are connected in series, their resistances add up. Therefore, by connecting two 200 ohm resistors in series, the total resistance will be 400 ohms.Rate this question:
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- 31.
A jar full of whisky contains 40% alcohol. A part of this whisky is replaced by another containing 19% alcohol and now the percentage of alcohol was found to be 26%. The quantity of whisky replaced is
- A.
1/3
- B.
2/3
- C.
2/5
- D.
3/5
Correct Answer
B. 2/3Explanation
Let's assume that the quantity of whisky in the jar is 100 units. Initially, the jar contains 40 units of alcohol and 60 units of non-alcoholic liquid. When a part of the whisky is replaced by another containing 19% alcohol, let's say x units of whisky are replaced. After the replacement, the amount of alcohol in the jar is 40 - (40/100)x + (19/100)x, and the total quantity of whisky in the jar is still 100 units. Given that the percentage of alcohol is now 26%, we can set up the equation: (40 - (40/100)x + (19/100)x) / 100 = 26/100. Solving this equation, we find x = 2/3. Therefore, the quantity of whisky replaced is 2/3.Rate this question:
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- 32.
A 6% stock yields 8%. The market value of the stock is
- A.
75
- B.
48
- C.
96
- D.
133.33
Correct Answer
A. 75 -
- 33.
During the past year, Josh saw more movies than Stephen.Stephen saw fewer movies than Darren.Darren saw more movies than Josh.If the first two statements are true, the third statement is
- A.
True
- B.
False
- C.
Uncertain
Correct Answer
C. UncertainExplanation
The given statements imply that Josh saw the most movies, followed by Darren, and then Stephen. However, it is not clear how many movies each of them saw in total. Therefore, it is uncertain whether the third statement is true or false.Rate this question:
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- 34.
In which decade was the first solid state integrated circuit demonstrated?
- A.
1950s
- B.
1960s
- C.
1970s
- D.
1980s
Correct Answer
A. 1950sExplanation
The correct answer is 1950s. This is because the first solid state integrated circuit was demonstrated in the 1950s. Integrated circuits are tiny electronic devices that are made up of multiple components, such as transistors, resistors, and capacitors, all integrated onto a single chip of semiconductor material. The development of the integrated circuit revolutionized the field of electronics and paved the way for the miniaturization of electronic devices, leading to advancements in computing, telecommunications, and many other industries.Rate this question:
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- 35.
What did Galileo invented?
- A.
Barometer
- B.
Pendulum clock
- C.
Microscope
- D.
Thermometer
Correct Answer
D. ThermometerExplanation
Galileo did not invent the thermometer. The thermometer was actually invented by Galileo's contemporary, Galileo Galilei. Galileo is best known for his contributions to the field of astronomy, including his observations of the moons of Jupiter and his support for the heliocentric model of the solar system. He also made significant advancements in the study of physics and mathematics. However, the invention of the thermometer is not one of his accomplishments.Rate this question:
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- 36.
India's first mission to chandrayan is launched from the site?
- A.
Wheelers island
- B.
Balsore
- C.
Satish dhawan
- D.
None of these
Correct Answer
C. Satish dhawanExplanation
The correct answer is Satish Dhawan. Satish Dhawan Space Centre (SDSC) is the launch site for India's space missions, including the Chandrayaan mission. It is located in Sriharikota, Andhra Pradesh.Rate this question:
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- 37.
Who is the present chairman of ISRO
- A.
Radhakrishnan
- B.
Shailesh nayak
- C.
Kiran kumar
- D.
M Y S prasad
Correct Answer
C. Kiran kumarExplanation
Kiran Kumar is the correct answer because he was the Chairman of ISRO (Indian Space Research Organisation) from 2015 to 2018. He succeeded K. Radhakrishnan and was responsible for overseeing various space missions and projects during his tenure.Rate this question:
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- 38.
Arrange the ascending order of the frequency ranges or bandwith
- A.
Male voice, female voice,audio, telephone
- B.
Female voice, malevoice,telephone,audio
- C.
Female voice,telephone,male voice,audio
- D.
Male voice,female voice,telephone,audio
Correct Answer
D. Male voice,female voice,telephone,audioExplanation
The given answer, "male voice, female voice, telephone, audio," arranges the frequency ranges or bandwidth in ascending order. This means that the frequency range of male voice is the lowest, followed by female voice, then telephone, and finally audio, which has the highest frequency range.Rate this question:
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- 39.
What is the morse code for letter A?
- A.
Dot dot dash
- B.
Dot dash dot
- C.
Dot dash
- D.
Dash dot
Correct Answer
C. Dot dashExplanation
The letter A in Morse code is represented by the sequence "dot dash". In Morse code, each letter is assigned a unique combination of dots (short signals) and dashes (long signals). The sequence "dot dash" specifically corresponds to the letter A.Rate this question:
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.png "If you are a circuit enthusiast you must have seen this definitely on your home circuits.What is it?")
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