UGC-NET Computer Science Previous Year Question Papers

 UGC-NET NOVEMBER 2017 QUESTIONS WITH EXPLANATION 

CBSE-NET NOVEMBER 2017 QUESTIONS WITH EXPLANATION 

NTA-NET NOVEMBER 2017 QUESTIONS WITH EXPLANATION 

Q:15 With respect to CRT, the horizontal retrace is defined as:

(A) The path an electron beam takes when returning to the left side of the CRT.

(B) The path an electron beam takes when returning to the right side of the CRT.

(C) The technique of turning the electron beam off while retracing.

(D) The technique of turning the electron beam on/off while retracing.


Answer: (A)

Explanation: In computer graphics Horizontal Retrace is defined as: The path an electron beam takes when returning to the left side of the CRT.

The scanning process sweeps the beam from left to right across the screen. At the end of the scanline the beam is moved to the start of the next (horizontal retrace). After the last scanline the beam is returned to the start position. (Vertical retrace).

So, option (A) is correct.

UGC-NET Computer Science Previous Year Question Papers

 UGC-NET NOVEMBER 2017 QUESTIONS WITH EXPLANATION 

CBSE-NET NOVEMBER 2017 QUESTIONS WITH EXPLANATION 

NTA-NET NOVEMBER 2017 QUESTIONS WITH EXPLANATION 

Q:14 Which of the following is not true in case of Oblique Projections?
(A) Parallel projection rays are not perpendicular to the viewing plane.
(B) Parallel lines in space appear parallel on the final projected image.
(C) Used exclusively for pictorial purposes rather than formal working drawings.
(D) Projectors are always perpendicular to the plane of projection.


Answer: (D)

Explanation: 

 

(A) → Parallel projection rays are not perpendicular to the viewing plane. TRUE
(B) → Parallel lines in space appear parallel on the final projected image. TRUE
(C) → Used exclusively for pictorial purposes rather than formal working drawings. TRUE

(D) → Projectors are always perpendicular to the plane of projection. False

The projectors in oblique projection intersect the projection plane at an oblique angle to produce the projected image, as opposed to the perpendicular angle used in orthographic projection. 

So, option (D) is correct.

UGC-NET Computer Science Previous Year Question Papers

 UGC-NET NOVEMBER 2017 QUESTIONS WITH EXPLANATION 

CBSE-NET NOVEMBER 2017 QUESTIONS WITH EXPLANATION 

NTA-NET NOVEMBER 2017 QUESTIONS WITH EXPLANATION 

Q:11 Given two relations R1(A, B) and R2(C, D), the result of following query

Select distinct A, B
from R1, R2

is guaranteed to be same as R1 provided one of the following condition is satisfied.
(A) R1 has no duplicates and R2 is empty.
(B) R1 has no duplicates and R2 is non – empty.
(C) Both R1 and R2 have no duplicates.
(D) R2 has no duplicates and R1 is non – empty.


Answer: (B)

Explanation: Select A,B
From R1, R2 :
In this query first we will take Cartesian product of R1, R2 (R2 must be non empty)for this 0- R2 then select distinct A,B from Cartesian product of R1, R2 (for A,B being distinct there should not any duplicate A,B).
And
Select A,B
From R2
For this query A,B → No duplicate A,B.
By combining condition for both query we will get the right condition.
So, option (B) is correct.