Microprocessors - Section 1 (4)

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Microprocessors - Section 1

25.

Assertion (A): If source and destination addresses are made implicit the length of instruction is reduced.

Reason (R): 8085 has only 3 addressing modes.

A.	Both A and R are correct and R is correct explanation of A
B.	Both A and R are correct but R is not correct explanation of A
C.	A is correct R is wrong
D.	A is wrong R is correct

Answer: Option C

Explanation:

The number of addressing modes is five.

26.

In a microprocessor

A.	all instructions need only one machine cycle
B.	some instructions need only one machine cycle while some other instructions need more than one machine cycle
C.	all instructions need only fraction of one machine cycle
D.	some instructions need less than one machine cycle

Answer: Option B

Explanation:

Some instructrions do need more than one machine cycle.

27.

In which computer language is 'break' statement used

A.	Fortran 77
B.	Pascal
C.	C
E.	none of the above

Answer: Option C

Explanation:

Whenever keyword 'break' is encountered inside any C loop control passes to the first statement after the loop.

28.

Temporary register in 8085 is a 16 bit register.

A.	True
B.	False

Answer: Option B

Explanation:

It is 8 bit-register.

29.

Which of the following real variable names is not valid in Fortran?

A.	BETA
B.	ALPHA
C.	A
D.	AB * 2

Answer: Option D

Explanation:

Operator is not allowed.

30.

The interface chip for 8086 and 16 bit ADC is

A.	8259
B.	8255
C.	8253
D.	8251

Answer: Option B

Explanation:

8255 is interface chip for 8086 and ADC.

31.

Most of the memory chips in static RAM

A.	do not require any supply
B.	need 2 V supply
C.	need 5 V supply
D.	need 12 V supply

Answer: Option C

Explanation:

Digital chips need 5 V supply.

32.

The number of storage classes in C is

A.	2
B.	3
C.	4
D.	6

Answer: Option C

Explanation:

C has four storage classes viz. automatic storage class, register storage class, static storage class and external storage class.

Microprocessors - Section 1 (4)

Microprocessors - Section 1

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