Explore topic-wise MCQs in Internet of things (IoT).

This section includes 243 Mcqs, each offering curated multiple-choice questions to sharpen your Internet of things (IoT) knowledge and support exam preparation. Choose a topic below to get started.

151.

TBCLn provided in each channel is actually

A. a comparator
B. compare latch
C. controller
D. control logic
Answer» C. controller
152.

Rising edge on SDA while SCL is high denotes

A. start condition (S)
B. stop condition (P)
C. transfer in progress
D. none of the mentioned
Answer» C. transfer in progress
153.

CCI1B comes from

A. ACLK
B. CAOUT
C. SCLK
D. TACLK
Answer» C. SCLK
154.

TBOUTH can pin can be used to

A. values are moved from one place to another
B. the length of the number of bits is selected by this register
C. it can be used to put all the outputs of the Timer_B register in the high impedance state
D. it can be used for outputting the input values of the timers
Answer» D. it can be used for outputting the input values of the timers
155.

Pull-up resistors Rp keep the lines at VCC when

A. all the drivers are active
B. none of the drivers are active
C. some the drivers are at sleep
D. none of the driver is at sleep
Answer» C. some the drivers are at sleep
156.

WDTISx bits control the

A. period of the clock
B. act as “Nonmaskable Interrupts”
C. stop the watchdog timer
D. start the watchdog timer
Answer» B. act as “Nonmaskable Interrupts”
157.

Why Timer_B is not considered as most suitable one for receiving asynchronous signals?

A. because of the absence of the TBOUTH input pin
B. because of the presence of the TBOUTH input pin
C. because of the absence of the SCCI bit
D. because of the presence of the SCCI bit
Answer» D. because of the presence of the SCCI bit
158.

In AVR, which registers are there for the I/O programming of ports?

A. PORT
B. PIN
C. DDR
D. All of the mentioned
Answer» E.
159.

The status register in MSP430 consists of

A. 1 byte
B. 2 bytes
C. 1 bit
D. 2 bit
Answer» C. 1 bit
160.

To see if any key is pressed, all rows are grounded.

A. true
B. false
C. can’t be said
D. depends on the conditions
Answer» B. false
161.

Which pin is used for the input clock of the counter0?

A. PORTB.0
B. PORTB.1
C. PORTB.2
D. PORTB.3
Answer» B. PORTB.1
162.

UCB0RXIFG is set when

A. complete byte is acknowledged
B. complete byte is transmitted
C. complete byte is received
D. none of the mentioned
Answer» D. none of the mentioned
163.

What does RI handshaking signal refer to according to the RS232 logic?

A. if this logic is high then an receive interrupt is generated
B. this pin is high during transmission
C. this pin is high during reception in order to tell that the device is busy at this particular time
D. none of the mentioned
Answer» D. none of the mentioned
164.

What is the major difference between a MAX232 and a MAX233 device?

A. one has one serial port other has two
B. one has inbuilt UART other doesn’t have that
C. one needs some additional circuitry to operate while the other doesn’t have that
D. one is used just for transmission while the other is used for both transmission as well as reception
Answer» D. one is used just for transmission while the other is used for both transmission as well as reception
165.

Indirect register mode is used by

A. source register
B. destination register
C. both of the mentioned
D. none of the mentioned
Answer» B. destination register
166.

With fosc= 8 MHz, what will the count that has to filled in the UBRR register to account for the 9600 baud rate?

A. 67H
B. CEH
C. 33H
D. 34H
Answer» D. 34H
167.

WDTNMI is found in the

A. higher byte of WDTCTL
B. lower byte of WDTCTL
C. its first four bits
D. its last four bits
Answer» C. its first four bits
168.

Which of the following is a type of a electromagnetic relay?

A. SPST
B. SPDT
C. DPDT
D. All of the mentioned
Answer» E.
169.

The output of a DAC0808 is in form of

A. electrical pulse
B. current
C. voltage
D. all of the mentioned
Answer» C. voltage
170.

Is CPKH and CPOL the same

A. yes
B. no
C. can't be said
D. depends on the conditions
Answer» C. can't be said
171.

What will happen if two keys of the keyboard are pressed at a time?

A. both the keys will be displayed on the screen
B. the key which is being actually pressed(for more then 20microseconds) will be displayed
C. the key that is pressed first will be displayed
D. none of the mentioned
Answer» C. the key that is pressed first will be displayed
172.

Which of the two architecture saves memory?

A. Harvard
B. Von Neumann
C. None of the mentioned
D. Both of the mentioned
Answer» C. None of the mentioned
173.

Which of the following bits reads 0 under normal conditions but goes 1 when it wants to initiate some action?

A. WDTNMI
B. WDTHOLD
C. WDTTMSEL
D. WDTCNTCL
Answer» E.
174.

USI handles

A. SPI
B. I2C
C. Both of the mentioned
D. None of the mentioned
Answer» D. None of the mentioned
175.

Which of the following is the slave to be addressed when a device acts as a master

A. UCB0I2COA
B. UCB0I2CSA
C. UCB0I2CIE
D. All of the mentioned
Answer» C. UCB0I2CIE
176.

Which instruction is used to call functions?

A. MOV
B. GO
C. CALL
D. All of the mentioned
Answer» D. All of the mentioned
177.

To ensure that a negative fluctuation does not trigger an unwanted downward transition by pulling the input down through VIT−, we must choose

A. minimum hysteresis
B. maximum hysteresis
C. all of the mentioned
D. none of the mentioned
Answer» B. maximum hysteresis
178.

Which of the following is correct?

A. I2C is a technique by which data is transmitted with the help of only eight pins
B. SDA is used to synchronize data transfer between two chips
C. TWI is an another name for I2C
D. All of the mentioned
Answer» D. All of the mentioned
179.

All channels within Timer_A share the same timer block

A. yes
B. no
C. can't be said
D. depends on the conditions
Answer» B. no
180.

Clock is transmitted in the asynchronous communication?

A. yes
B. no
C. can't be said
D. depends on the conditions
Answer» C. can't be said
181.

The key detection and the key identification are two different procedures?

A. true
B. false
C. depends on the circumstances
D. difficult to tell
Answer» B. false
182.

The relaxation oscillator circuit helps in

A. calculating the duration single RC transient
B. setting the reference voltage
C. setting the clock frequency
D. calculating the conversion speed
Answer» B. setting the reference voltage
183.

Sigma delta converter is a

A. 1 bit converter
B. 2 bit converter
C. 3 bit converter
D. 4 bit converter
Answer» B. 2 bit converter
184.

When the buffer is________ the low power mode is__________

A. empty, reset
B. having one byte, reset
C. full, reset
D. empty, two
Answer» D. empty, two
185.

Which of the following is correct about the word resolution in ADC DAC converters in AVR’s?

A. it is the smallest change that can be described by an ADC
B. it is equal to Vref/2^n (where n represents the number of bits)
C. it is 0.076 for n=16 and Vref=5V
D. all of the mentioned
Answer» E.
186.

Do LM34 and LM35 based sensors have linear output?

A. yes
B. no
C. depends on the conditions
D. can’t say
Answer» B. no
187.

What is the function of __ __interrupt keyword

A. it is used to enable the interrupt
B. it is used to disable the interrupt
C. it is used to assign a particular address to a vector
D. all of the mentioned
Answer» D. all of the mentioned
188.

The 8255 can be programmed in any of the

A. 2 modes
B. 3 modes
C. 4 modes
D. 5 modes
Answer» D. 5 modes
189.

The length of TBR can be programmed to be

A. 8 bits
B. 12 bits
C. 16 bits
D. all of the mentioned
Answer» E.
190.

Which of the following is correct about the baud rate during serial transmission?

A. it tells us about the speed at which the transmission is going to place
B. it tells us about the number of bits transferred during a second
C. none of the mentioned
D. all of the mentioned
Answer» E.
191.

The intervals between the samples is obtained from

A. Fs
B. Ts
C. Us
D. Ks
Answer» C. Us
192.

Indirect mode and the indirect auto increment mode have which common operator in them

A. +
B.
C. @
D. &
Answer» D. &
193.

Which of the following is an issue while programming I2C using software?

A. open-collector output
B. open-drain output
C. totem pole output
D. all of the mentioned
Answer» C. totem pole output
194.

Unused pins must never be left unconnected in their default state as inputs.

A. true
B. false
C. can't be said
D. depends on the conditions
Answer» B. false
195.

Why initially all keys are considered open before detecting the key pressed?

A. to make task easy
B. to remove the errors caused by other pressing keys during detection
C. to remove the flow problems
D. none of the mentioned
Answer» C. to remove the flow problems
196.

Which of the following are the low power modes?

A. LPM0
B. LPM3
C. LPM4
D. All of the mentioned
Answer» E.
197.

What actually is SD16_A?

A. it is an interrupt
B. it is a timer
C. it is an analog to Digital Converter
D. it is a serial communication module
Answer» D. it is a serial communication module
198.

SD16_A features are controlled by

A. memory mapped registers
B. register mapped registers
C. data mapped registers
D. none of the mentioned
Answer» B. register mapped registers
199.

While conversion is in progress, which of the flag is affected.

A. ADC10ON
B. ADC10MEM
C. ADC10BUSY
D. ADC10DF
Answer» D. ADC10DF
200.

Which out of the following instructions don’t affect the flags of the status register?

A. AND
B. INC
C. OR
D. ADD
Answer» E.