1.purpose of PC (program counter)in a microprocessor is ----
a) To store address of TOS(top of stack)
b) To store address of next instructions to be executed
c) count the number of instructions
d) to store the base address of the stack.
2.conditional results after execution of an instruction in a microprocess is stored in
a) register b) accumulator c) flag register d) flag register part of PSW (program status word)
3.The OR gate can be converted to the NAND function by adding----gate(s)to the input of the OR gate.
a) NOT b) AND c) NOR d) XOR
4.In 8051microcontroller ,------has a dual function.
a) port 3 b) port 2 c) port 1 d) port 0
5.An 8085 based microprocessor with 2MHz clock frequency,will execute the following chunk of code with how much delay?
MVI B,38H
HAPPY: MVI C, FFH
SADDY: DCR C
JNZ SADDY
DCR B
JNC HAPPY
a) 102.3 b)114.5 c)100.5 d)120
6.In 8085 MPU what will be the status of the flag after the execution of the following chunk of code.
MVI B,FFH
MOV A,B
CMA
HLT
a)S = 1, Z = 0, CY = 1 b)S = 0, Z = 1, CY = 0
c) S = 1, Z = 0, CY = 0 d)S = 1, Z = 1 ,CY = 1
7.A positive going pulse which is always generated when 8085 MPU begins the machine cycle.
a) RD b) ALE c) WR d) HOLD
8.when a ----- instruction of 8085 MPU is fetched , its second and third bytes are placed in the W and Z registers.
a) JMP b) STA c) CALL d) XCHG
9.what is defined as one subdivision of the operation performed in one clock period.
a) T- State b) Instruction Cycle c) Machine Cycle d) All of the above
10.At the end of the following code, what is the status of the flags.
LXI B, AEC4H
MOV A,C
ADD B
HLT
a) S = 1, CY = 0, P = 0 , AC = 1 b) S =0 , CY = 1, P = 0,AC = 1
c) S = 0, CY = 1, P = 0 , AC = 1 d) S = 0, CY = 1, P = 1 , AC = 1
11.The repeated execution of a loop of code while waiting for an event to occur is called ---------.The cpu is not engaged in any real productive activity during this period,and the process doesn?t progress towards completion.
a) dead lock b) busy waiting c) trap door d) none.
12. Transparent DBMS is defined as
a) A DBMS in which there are no program or user access languages. b) A DBMS which has no cross file capabilities but is user friendly and provides user interface management. c) A DBMS which keeps its physical structure hidden from user d) none.
13.Either all actions are carried out or none are.users should not have to worry about the effect of incomplete transctions.DBMS ensures this by undoing the actions of incomplete transctions.this property is known as
a) Aggregation b) atomicity c) association d) data integrity.
14.------ algorithms determines where in available to load a program. common methods are first fit,next fit,best fit.--------- algorithm are used when memory is full , and one process (or part of a process) needs to be swaped out to accommodate a new program.The ------------- algorithm determines which are the partions to be swaped out.
a) placement, placement, replacement
b) replacement, placement, placement
c) replacement, placement, replacement
d) placement, replacement, replacement
15.Trap door is a secret undocumented entry point into a program used to grant access without normal methods of access authentication.A trap is a software interrupt,usually the result of an error condition.
a)true b)false.
16.which one of the following is the recursive travel technique.
a)depth first search b)preorder c)breadth first search d)none.
17..in recursive implementations which of the following is true for saving the state of the steps
a)as full state on the stack
b) as reversible action on the stack
c)both a and b
d)none
18.which of the following involves context switch
a)previliged instruction
b)floating point exception
c)system calls
d)all
e)none
19.piggy backing is a technique for
a)acknowledge
b)sequence
c)flow control
d)retransmission
20. a functional dependency XY is ___________dependency if removal of any attribute A from X means that the dependency does not hold any more
a)full functional
b) multi valued
c)single valued
d)none
21)a relation schema R is in BCNF if it is in ___________and satisfies an additional constraints that for every functional dependency XY,X must be a candidate key
a)1 NF
b)2 NF
c)3 NF
d)5 NF
22) a _________sub query can be easily identified if it contains any references to the parent sub query columns in the _________ clause
A) correlated ,WHERE
b) nested ,SELECT
c) correlated,SELECT
d) none
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