UGC NET CS 2017 Jan - III

Question 1

Which of the following is an interrupt according to temporal relationship with system clock ?

• Maskable interrupt
• Periodic interrupt
• Division by zero
• Synchronous interrupt

Question 2

Given the following two statements : A. L = {w|n_a(w) = n_b(w)} is deterministic context free language, but not linear. B. L = {aⁿ bⁿ} ∪ {aⁿ b²ⁿ} is linear, but not deterministic context free language. Which of the following options is correct ?

• Both (A) and (B) are false.
• Both (A) and (B) are true.
• (A) is true, (B) is false.
• (A) is false, (B) is true.

Question 3

Which of the following is incorrect for virtual memory?

• Large programs can be written
• More I/O is required
• More addressable memory available
• Faster and easy swapping of process

Question 4

The general configuration of the micro-programmed control unit is given below: What are blocks B and C in the diagram respectively?

• Block address register and cache memory
• Control address register and control memory
• Branch register and cache memory
• Control address register and random access memory

Question 5

Match the following :

• (1)
• (2)
• (3)
• (4)

Question 6

In 8085 microprocessor, the digit 5 indicates that the microprocessor needs:

• –5 volts, +5 volts supply
• +5 volts supply only
• –5 volts supply only
• 5 MHz clock

Question 7

In 8085, which of the following performs : load register pair immediate operation?

• LDAX rp
• LHLD addr
• LXI rp, data
• INX rp

Question 8

Consider following schedules involving two transactions: S1 : r1(X); r1(Y); r2(X); r2(Y); w2(Y); w1(X) S2 : r1(X); r2(X); r2(Y); w2(Y); r1(Y); w1(X) Which of the following statement is true?

• Both S1 and S2 are conflict serializable.
• S1 is conflict serializable and S2 is not conflict serializable.
• S1 is not conflict serializable and S2 is conflict serializable.
• Both S1 and S2 are not conflict serializable.

Question 9

Which one is correct w.r.t. RDBMS ?

• primary key ⊆ super key ⊆ candidate key
• primary key ⊆ candidate key ⊆ super key
• super key ⊆ candidate key ⊆ primary key
• super key ⊆ primary key ⊆ candidate key

Question 10

Let pk(R) denotes primary key of relation R. A many-to-one relationship that exists between two relations R₁ and R₂ can be expressed as follows :

• pk(R₂) → pk(R₁)
• pk(R₁) → pk(R₂)
• pk(R₂) → R₁ ∩ R₂
• pk(R₁) → R₁ ∩ R₂