M4-R5.1 Model Paper — Set 3 — MCQ Quiz | Free O-Level Study Notes & MCQs

1

What is the full form of CoAP? / CoAP का पूर्ण रूप क्या है?

A

Constrained Application Protocol

B

Control Application Protocol

C

Cloud Application Protocol

D

Constrained Access Protocol

2

Which layer of the OSI model is responsible for error detection and correction? / OSI मॉडल की कौन सी परत त्रुटि का पता लगाने और सुधार के लिए जिम्मेदार है?

A

Transport Layer

B

Data Link Layer

C

Network Layer

D

Physical Layer

3

What is the purpose of the 'break' statement in a loop? / लूप में 'break' स्टेटमेंट का क्या उद्देश्य है?

A

To skip the current iteration

B

To restart the loop

C

To exit the loop immediately

D

To pause the loop

4

Which sensor is used to detect the presence of an object without physical contact? / बिना भौतिक संपर्क के किसी वस्तु की उपस्थिति का पता लगाने के लिए किस सेंसर का उपयोग किया जाता है?

A

Temperature Sensor

B

Humidity Sensor

C

Pressure Sensor

D

Proximity Sensor

5

What is the range of the ultrasonic sensor HC-SR04? / अल्ट्रासोनिक सेंसर HC-SR04 की रेंज क्या है?

A

1 cm to 100 cm

B

2 cm to 400 cm

C

10 cm to 1000 cm

D

5 cm to 500 cm

6

What is the purpose of the 'random()' function in Arduino? / Arduino में 'random()' फ़ंक्शन का क्या उद्देश्य है?

A

To generate a truly random number

B

To sort numbers

C

To generate a pseudo-random number

D

To find the maximum number

7

What is the purpose of the 'randomSeed()' function in Arduino? / Arduino में 'randomSeed()' फ़ंक्शन का क्या उद्देश्य है?

A

To generate a random number

B

To generate a random seed

C

To reset the random number generator

D

To initialize the random number generator

8

What is a 7-segment display? / 7-सेगमेंट डिस्प्ले क्या है?

A

A display that shows letters using 7 segments

B

An LCD display

C

An OLED display

D

A display that shows digits using 7 LEDs

9

What is the purpose of a multiplexer in electronics? / इलेक्ट्रॉनिक्स में मल्टीप्लेक्सर का क्या उद्देश्य है?

A

To route a single input to many outputs

B

To amplify signals

C

To filter signals

D

To select one of many input signals and route it to a single output

10

What is a demultiplexer? / डीमल्टीप्लेक्सर क्या है?

A

A device that selects one of many inputs

B

A device that amplifies signals

C

A device that routes a single input to many outputs

D

A device that filters signals

11

What is an ADC in microcontroller? / माइक्रोकंट्रोलर में ADC क्या है?

A

Audio to Digital Converter

B

Analog to Data Converter

C

Address to Data Converter

D

Analog to Digital Converter

12

What is a DAC in microcontroller? / माइक्रोकंट्रोलर में DAC क्या है?

A

Data to Audio Converter

B

Digital to Address Converter

C

Data to Analog Converter

D

Digital to Analog Converter

13

What is the purpose of the 'sizeof()' operator in C? / C में 'sizeof()' ऑपरेटर का क्या उद्देश्य है?

A

To return the length of an array

B

To return the size of a function

C

To return the size of a file

D

To return the size of a variable or data type in bytes

14

What is the size of a 'char' data type in Arduino? / Arduino में 'char' डेटा टाइप का आकार क्या है?

A

2 bytes

B

4 bytes

C

8 bytes

D

1 byte

15

What is the size of a 'float' data type in Arduino? / Arduino में 'float' डेटा टाइप का आकार क्या है?

A

2 bytes

B

1 byte

C

8 bytes

D

4 bytes

16

What is the size of a 'double' data type in Arduino Uno? / Arduino Uno में 'double' डेटा टाइप का आकार क्या है?

A

8 bytes

B

2 bytes

C

1 byte

D

4 bytes (same as float)

17

What is the purpose of the 'static' keyword in C? / C में 'static' कीवर्ड का क्या उद्देश्य है?

A

To make a variable constant

B

To make a variable global

C

To make a variable volatile

D

To preserve variable value between function calls

18

What is the purpose of the 'volatile' keyword in Embedded C? / एम्बेडेड C में 'volatile' कीवर्ड का क्या उद्देश्य है?

A

To make a variable constant

B

To make a variable static

C

To make a variable global

D

To prevent compiler optimization on a variable

19

What is the purpose of the 'const' keyword in C? / C में 'const' कीवर्ड का क्या उद्देश्य है?

A

To make a variable static

B

To make a variable volatile

C

To make a variable global

D

To declare a constant variable whose value cannot be changed

20

What is a pointer in C? / C में पॉइंटर क्या है?

A

A variable that stores a value

B

A function that returns an address

C

An array of values

D

A variable that stores the memory address of another variable

21

What is the output of sizeof(int) on Arduino Uno? / Arduino Uno पर sizeof(int) का आउटपुट क्या है?

A

4

B

1

C

8

D

2

22

What is a structure in C? / C में स्ट्रक्चर क्या है?

A

A built-in data type

B

A function

C

An array

D

A user-defined data type that groups related variables

23

What is a union in C? / C में यूनियन क्या है?

A

A user-defined data type where members have separate memory

B

A built-in data type

C

A function

D

A user-defined data type where all members share the same memory location

24

What is the difference between a structure and a union? / स्ट्रक्चर और यूनियन के बीच क्या अंतर है?

A

Union allocates separate memory for each member, structure shares memory

B

Both allocate separate memory

C

Both share memory

D

Structure allocates separate memory for each member, union shares memory

25

What is an enum in C? / C में एनम क्या है?

A

A function

B

An array

C

A pointer

D

A user-defined data type for defining named integer constants

26

What is the purpose of the 'continue' statement in a loop? / लूप में 'continue' स्टेटमेंट का क्या उद्देश्य है?

A

To exit the loop immediately

B

To restart the loop

C

To pause the loop

D

To skip the current iteration and continue with the next

27

What is a preprocessor directive? / प्रीप्रोसेसर डायरेक्टिव क्या है?

A

Instructions to the user

B

Instructions to the linker

C

Instructions to the assembler

D

Instructions to the compiler that start with #

28

What is the purpose of #define in C? / C में #define का क्या उद्देश्य है?

A

To define a function

B

To define a variable

C

To define a structure

D

To define a macro or constant

29

What is the purpose of #include in C? / C में #include का क्या उद्देश्य है?

A

To include a library

B

To include a source file

C

To include a variable

D

To include a header file

30

What is the purpose of #ifdef in C? / C में #ifdef का क्या उद्देश्य है?

A

To check if a variable exists

B

To check if a function exists

C

To check if a file exists

D

To check if a macro is defined

31

What is the purpose of #ifndef in C? / C में #ifndef का क्या उद्देश्य है?

A

To check if a macro is defined

B

To check if a variable is defined

C

To check if a function is defined

D

To check if a macro is not defined

32

What is the purpose of #endif in C? / C में #endif का क्या उद्देश्य है?

A

To end a loop

B

To end a function

C

To end a program

D

To end a conditional preprocessor directive

33

What is a bitwise operator? / बिटवाइज ऑपरेटर क्या है?

A

An operator that works on whole numbers

B

A logical operator

C

A relational operator

D

An operator that works on individual bits of a number

34

What is the output of 5 & 3? / 5 & 3 का आउटपुट क्या है?

A

5

B

3

C

7

D

1

35

What is the output of 5 | 3? / 5 | 3 का आउटपुट क्या है?

A

1

B

5

C

3

D

7

36

What is the output of 5 ^ 3? / 5 ^ 3 का आउटपुट क्या है?

A

1

B

7

C

5

D

6

37

What is the output of ~5? / ~5 का आउटपुट क्या है?

A

6

B

-5

C

5

D

-6

38

What is the output of 5 << 1? / 5 << 1 का आउटपुट क्या है?

A

2

B

5

C

1

D

10

39

What is the output of 5 >> 1? / 5 >> 1 का आउटपुट क्या है?

A

10

B

5

C

1

D

2

40

What is the purpose of the 'strcmp()' function in Embedded C? / एम्बेडेड C में 'strcmp()' फ़ंक्शन का क्या उद्देश्य है?

A

To copy one string to another

B

To find the length of a string

C

To concatenate two strings

D

To compare two strings

41

What is the purpose of a watchdog timer in Arduino? / Arduino में वॉचडॉग टाइमर का क्या उद्देश्य है?

A

To measure time accurately

B

To generate PWM signals

C

To read analog sensors

D

To reset the microcontroller if the program freezes

42

What is the function of the 'digitalPinToInterrupt()' macro in Arduino? / Arduino में 'digitalPinToInterrupt()' मैक्रो का क्या कार्य है?

A

To read the value of a digital pin

B

To write a value to a digital pin

C

To configure a pin as input

D

To convert a digital pin number to its corresponding interrupt number

43

What is the ideal body language during an interview? / साक्षात्कार के दौरान आदर्श बॉडी लैंग्वेज क्या होनी चाहिए?

A

Slouch in the chair and look at the floor

B

Cross your arms and avoid eye contact

C

Keep your phone on the table and check it frequently

D

Sit straight, make eye contact, and avoid fidgeting

44

What is the difference between 'Serial.print()' and 'Serial.println()' in Arduino? / Arduino में 'Serial.print()' और 'Serial.println()' के बीच क्या अंतर है?

A

print() adds a newline, println() does not

B

Both are exactly the same

C

print() works only for numbers, println() works for text

D

println() adds a newline after the text, print() does not

45

What is the purpose of the 'map()' function in Arduino? / Arduino में 'map()' फ़ंक्शन का क्या उद्देश्य है?

A

To create a map of the area

B

To draw a map

C

To store coordinates

D

To re-map a number from one range to another

46

What is the output of map(50, 0, 100, 0, 255)? / map(50, 0, 100, 0, 255) का आउटपुट क्या है?

A

128

B

127

C

255

D

127.5

47

What is the purpose of the 'constrain()' function? / 'constrain()' फ़ंक्शन का क्या उद्देश्य है?

A

To create a constant

B

To limit the loop

C

To restrict memory

D

To constrain a number to be within a range

48

What is the output of constrain(150, 0, 100)? / constrain(150, 0, 100) का आउटपुट क्या है?

A

150

B

0

C

50

D

100

49

What is the purpose of the 'abs()' function? / 'abs()' फ़ंक्शन का क्या उद्देश्य है?

A

To return the square root

B

To return the power

C

To return the remainder

D

To return the absolute value of a number

50

What is the purpose of the 'pow()' function in Arduino? / Arduino में 'pow()' फ़ंक्शन का क्या उद्देश्य है?

A

To calculate square root

B

To calculate logarithm

C

To calculate exponent

D

To calculate the power of a number

51

What is the purpose of the 'sqrt()' function? / 'sqrt()' फ़ंक्शन का क्या उद्देश्य है?

A

To calculate power

B

To calculate absolute value

C

To calculate remainder

D

To calculate the square root of a number

52

What is a breadboard? / ब्रेडबोर्ड क्या है?

A

A type of microcontroller

B

A sensor

C

A power supply

D

A board for prototyping circuits without soldering

53

What is a resistor used for? / रेजिस्टर का उपयोग किस लिए किया जाता है?

A

To increase voltage

B

To store energy

C

To amplify signals

D

To limit current in a circuit

54

What is a capacitor used for? / कैपेसिटर का उपयोग किस लिए किया जाता है?

A

To limit current

B

To amplify signals

C

To generate heat

D

To store electrical energy

55

What is a diode used for? / डायोड का उपयोग किस लिए किया जाता है?

A

To store energy

B

To amplify signals

C

To limit current

D

To allow current to flow in only one direction

56

What is a transistor used for? / ट्रांजिस्टर का उपयोग किस लिए किया जाता है?

A

To store energy

B

To limit current

C

To generate light

D

To amplify or switch electronic signals

57

What is a potentiometer? / पोटेंशियोमीटर क्या है?

A

A fixed resistor

B

A capacitor

C

A diode

D

A variable resistor used to adjust voltage

58

What is the purpose of a buzzer in IoT? / IoT में बजर का क्या उद्देश्य है?

A

To measure sound

B

To record audio

C

To amplify sound

D

To produce sound as an alert or notification

59

What is the purpose of a vibration sensor? / वाइब्रेशन सेंसर का क्या उद्देश्य है?

A

To measure temperature

B

To measure humidity

C

To detect gas

D

To detect vibrations or movement

60

What is a flow sensor used for? / फ्लो सेंसर का उपयोग किस लिए किया जाता है?

A

To measure temperature

B

To measure pressure

C

To measure humidity

D

To measure the flow rate of liquid or gas

61

What is a pressure sensor used for? / प्रेशर सेंसर का उपयोग किस लिए किया जाता है?

A

To measure temperature

B

To measure humidity

C

To measure light

D

To measure pressure of gases or liquids

62

What is a touch sensor? / टच सेंसर क्या है?

A

A sensor that measures temperature

B

A sensor that measures light

C

A sensor that measures sound

D

A sensor that detects physical touch

63

What is a color sensor used for? / कलर सेंसर का उपयोग किस लिए किया जाता है?

A

To measure temperature

B

To measure distance

C

To measure humidity

D

To detect and identify colors

64

What is a barometric pressure sensor? / बैरोमीट्रिक प्रेशर सेंसर क्या है?

A

A sensor that measures temperature

B

A sensor that measures humidity

C

A sensor that measures light

D

A sensor that measures atmospheric pressure

65

What is a heart rate sensor? / हार्ट रेट सेंसर क्या है?

A

A sensor that measures blood pressure

B

A sensor that measures temperature

C

A sensor that measures oxygen level

D

A sensor that measures heartbeats per minute

66

What is an accelerometer used for? / एक्सेलेरोमीटर का उपयोग किस लिए किया जाता है?

A

To measure temperature

B

To measure humidity

C

To measure distance

D

To measure acceleration forces

67

What is a gyroscope used for? / जाइरोस्कोप का उपयोग किस लिए किया जाता है?

A

To measure temperature

B

To measure humidity

C

To measure distance

D

To measure orientation and angular velocity

68

What is a magnetometer used for? / मैग्नेटोमीटर का उपयोग किस लिए किया जाता है?

A

To measure temperature

B

To measure humidity

C

To measure distance

D

To measure magnetic fields

69

What is an IMU sensor? / IMU सेंसर क्या है?

A

Infrared Measurement Unit

B

Integrated Motor Unit

C

Input Management Unit

D

Inertial Measurement Unit - combines accelerometer and gyroscope

70

What is the purpose of a relay in IoT? / IoT में रिले का क्या उद्देश्य है?

A

To measure voltage

B

To measure current

C

To store energy

D

To control high-voltage devices using low-voltage signals

71

What is the difference between normally open (NO) and normally closed (NC) relay contacts? / सामान्य रूप से खुले (NO) और सामान्य रूप से बंद (NC) रिले संपर्कों के बीच क्या अंतर है?

A

NO is closed when relay is off, NC is open when relay is off

B

Both are the same

C

Neither works

D

NO is open when relay is off, NC is closed when relay is off

72

What is the purpose of an optocoupler? / ऑप्टोकपलर का क्या उद्देश्य है?

A

To amplify signals

B

To store energy

C

To measure light

D

To isolate electrical circuits using light

73

What is a MOSFET? / MOSFET क्या है?

A

A type of sensor

B

A type of microcontroller

C

A type of resistor

D

A type of transistor used for switching and amplification

74

What is the purpose of a voltage regulator? / वोल्टेज रेगुलेटर का क्या उद्देश्य है?

A

To increase voltage

B

To decrease voltage

C

To store voltage

D

To maintain a constant voltage level

75

What is a buck converter? / बक कनवर्टर क्या है?

A

A DC-DC converter that steps up voltage

B

An AC-DC converter

C

A DC-AC converter

D

A DC-DC converter that steps down voltage

76

What is a boost converter? / बूस्ट कनवर्टर क्या है?

A

A DC-DC converter that steps down voltage

B

An AC-DC converter

C

A DC-AC converter

D

A DC-DC converter that steps up voltage

77

What is the purpose of a fuse? / फ्यूज का क्या उद्देश्य है?

A

To increase current

B

To store energy

C

To measure current

D

To protect circuits from overcurrent

78

What is a circuit breaker? / सर्किट ब्रेकर क्या है?

A

A one-time use fuse

B

A switch

C

A resistor

D

A resettable device that protects circuits from overcurrent

79

What is the purpose of grounding in a circuit? / सर्किट में ग्राउंडिंग का क्या उद्देश्य है?

A

To increase voltage

B

To store energy

C

To measure current

D

To provide a reference voltage and safety path for current

80

What is the difference between AC and DC? / AC और DC के बीच क्या अंतर है?

A

DC alternates direction, AC flows in one direction

B

Both are the same

C

AC is always high voltage

D

AC alternates direction, DC flows in one direction

81

What is the standard voltage for household AC in India? / भारत में घरेलू AC के लिए मानक वोल्टेज क्या है?

A

110V, 60Hz

B

230V, 60Hz

C

110V, 50Hz

D

230V, 50Hz

82

What is the purpose of a transformer? / ट्रांसफार्मर का क्या उद्देश्य है?

A

To change AC to DC

B

To change DC to AC

C

To store energy

D

To change voltage levels in AC circuits

83

What is a rectifier used for? / रेक्टिफायर का उपयोग किस लिए किया जाता है?

A

To convert DC to AC

B

To change voltage levels

C

To store energy

D

To convert AC to DC

84

What is an inverter used for? / इनवर्टर का उपयोग किस लिए किया जाता है?

A

To convert AC to DC

B

To change voltage levels

C

To store energy

D

To convert DC to AC

85

What is a battery? / बैटरी क्या है?

A

A device that generates AC

B

A device that measures current

C

A device that limits current

D

A device that stores chemical energy and converts it to electrical energy

86

What is the difference between a lithium-ion and a lead-acid battery? / लिथियम-आयन और लेड-एसिड बैटरी के बीच क्या अंतर है?

A

Lead-acid is lighter and rechargeable

B

Both are the same

C

Li-ion is not rechargeable

D

Li-ion is lighter and rechargeable, lead-acid is heavier

87

What is a solar panel? / सोलर पैनल क्या है?

A

A device that stores energy

B

A device that measures light

C

A device that generates heat

D

A device that converts sunlight into electricity

88

What is the purpose of a charge controller in a solar system? / सोलर सिस्टम में चार्ज कंट्रोलर का क्या उद्देश्य है?

A

To convert DC to AC

B

To store energy

C

To measure sunlight

D

To regulate battery charging from solar panels

89

What is a PWM charge controller? / PWM चार्ज कंट्रोलर क्या है?

A

Power Width Modulation controller

B

Pulse Wave Modulation controller

C

Power Wave Modulation controller

D

Pulse Width Modulation charge controller for batteries

90

What is an MPPT charge controller? / MPPT चार्ज कंट्रोलर क्या है?

A

Minimum Power Point Tracking controller

B

Maximum Power Transfer controller

C

Minimum Power Transfer controller

D

Maximum Power Point Tracking charge controller

91

What is the purpose of a heat sink? / हीट सिंक का क्या उद्देश्य है?

A

To generate heat

B

To store heat

C

To measure temperature

D

To dissipate heat from electronic components

92

What is a thermistor? / थर्मिस्टर क्या है?

A

A light-sensitive resistor

B

A pressure-sensitive resistor

C

A humidity-sensitive resistor

D

A temperature-sensitive resistor

93

What is the difference between PTC and NTC thermistors? / PTC और NTC थर्मिस्टर्स के बीच क्या अंतर है?

A

PTC decreases with temperature, NTC increases

B

Both increase with temperature

C

Both decrease with temperature

D

PTC resistance increases with temperature, NTC decreases

94

What is the purpose of the 'lowPower' library in Arduino? / Arduino में 'lowPower' लाइब्रेरी का क्या उद्देश्य है?

A

To increase the clock speed

B

To reduce power consumption by putting the microcontroller to sleep

C

To generate high voltage

D

To control multiple motors simultaneously

95

Which communication protocol is commonly used to connect multiple sensors using only two wires (SDA and SCL)? / कौन सा संचार प्रोटोकॉल केवल दो तारों (SDA और SCL) का उपयोग करके कई सेंसरों को जोड़ने के लिए आमतौर पर उपयोग किया जाता है?

A

SPI

B

UART

C

I2C

D

CAN

96

What is the significance of the 'setup()' function in Arduino? / Arduino में 'setup()' फ़ंक्शन का क्या महत्व है?

A

It runs repeatedly after the loop() function

B

It is optional and can be omitted

C

It runs only once when the board is powered on or reset

D

It is used to declare global variables only

97

What does the 'digitalWrite()' function do when called on a PWM pin with a value of 255? / PWM पिन पर 255 के मान के साथ 'digitalWrite()' फ़ंक्शन को कॉल करने पर क्या होता है?

A

It generates a 50% duty cycle PWM signal

B

It writes a LOW (0V) to the pin

C

It writes a HIGH (5V) to the pin

D

It generates a variable frequency signal

98

Which of the following is NOT a characteristic of a good resume? / निम्नलिखित में से कौन सी एक अच्छे रिज्यूमे की विशेषता नहीं है?

A

It should be concise and relevant to the job

B

It should contain false information to impress the employer

C

It should highlight achievements and skills

D

It should be free of spelling and grammatical errors

99

What is the function of the 'analogReference()' function in Arduino? / Arduino में 'analogReference()' फ़ंक्शन का क्या कार्य है?

A

To change the resolution of the ADC from 10-bit to 8-bit

B

To configure the reference voltage used for analog-to-digital conversion

C

To read the value from an analog pin

D

To disable all analog pins

100

In a professional presentation, what is the recommended maximum number of bullet points per slide? / एक प्रोफेशनल प्रेजेंटेशन में, प्रति स्लाइड बुलेट पॉइंट्स की अनुशंसित अधिकतम संख्या क्या है?

A

1-2

B

3-5

C

6-8

D

10-12