UGC NET CS Nov 2017

Two atomic operations permissible on Semaphores are _______ and _______.

1. A.wait, stop
2. D.wait, signal✓
3. C.hold, signal
4. B.wait, hold

Correct answer: D

The number of bits used for addressing in Gigabit Ethernet is

1. D.128 bit
2. C.64 bit
3. B.48 bit✓
4. A.32 bit

Correct answer: B

Which device forwards data from one network device to destination based on MAC address?

1. D.Gateway
2. C.Switch✓
3. B.Modem
4. A.Hub

Correct answer: C

The expression *ptrdata++ is evaluated as (in C++):

1. D.*(ptrdata++)✓
2. C.*(ptrdata)++
3. B.(*ptrdata)++
4. A.Depends on compiler

Correct answer: D

Disk head moves end-to-end serving requests, then returns to beginning without serving requests on return trip. Which algorithm is this?

1. A.LOOK
2. D.C-SCAN✓
3. C.C-LOOK
4. B.SCAN

Correct answer: D

n strings of length n are to be sorted lexicographically using merge-sort. The worst case running time is

1. D.O(n^3)
2. C.O(n^2 + log n)
3. B.O(n^2 log n)✓
4. A.O(n log n)

Correct answer: B

Member functions in C++ always access data in

1. D.The private part of its class
2. C.The public part of its class
3. B.The object of which it is a member
4. A.The class of which it is member✓

Correct answer: A

Which is incorrect regarding C++ virtual functions?

1. D.Defined in base class
2. C.Should be accessed using pointers
3. B.Virtual function can be static✓
4. A.Must be declared in public section

Correct answer: B