-->

# UGC NET Computer Science and Applications - Paper 3 (2012 June)

41. Which layer of OSI reference model uses the ICMP (Internet Control Message Protocol)?

(A) Transport layer

(C) Network layer

(D) Application layer

44. Which diagram provides a formal graphic notation for modelling objects, classes and their relationships to one another?

(A) Object diagram

(B) Class diagram

(C) Instance diagram

(D) Analysis diagram

45. A computer system supports 32 bit virtual address as well as 32 bit physical addresses. Since the virtual address space is of same size as that of physical address space, if we want to get rid of virtual memory, which one of the following is true?

(A) Efficient implementation of multiuser support is no longer possible.

(B) The processor cache can be made more efficient.

(C) Hardware support for memory management is not needed.

(D) CPU scheduling can be made more efficient.

46. The feasible region represented by the constraints

x1 – x2 < 1, x1 + x2 > 3, x1 > 0, x2 > 0 of the objective function Max Z = 3x1 + 2x2 is

(A) A polygon

(B) Unbounded feasible region

(C) A point

(D) None of these

47. The colour of an object is largely determined by its diffuse reflection coefficient. If Kd = (0.8, 0.4, 0), then what shall be the colour of the object, if the light used is blue and magenta?

(A) White and Red

(B) Red and Blue

(C) Black and White

(D) Black and Red

48. If an instruction takes ‘i’ microseconds and a page fault takes an additional ‘j’ microseconds. The effective instruction time, if on the average a page fault occurs every k instructions, is

(A) i + j/k

(B) i + j * k

(C) (i + j)/k

(D) (i + j) * k

50. How many relations are there on a set with n elements that are symmetric and a set with n elements that are reflexive and symmetric?

(A) 2n(n+1)/2 and 2n.3n(n–1)/2

(B) 3n(n–1)/2 and 2n(n–1)

(C) 2n(n+1)/2 and 3n(n–1)/2

(D) 2n(n+1)/2 and 2n(n–1)/2