# Rotation MCQ Questions And Answers

Rotation MCQs : This section focuses on "Rotation" in Computer Graphics. These Multiple Choice Questions (MCQ) should be practiced to improve the Computer Graphics skills required for various interviews (campus interview, walk-in interview, company interview), placements, entrance exams and other competitive examinations.

1. ___________ is a process of changing the angle of the object.

A. Translation

B. Rotation

C. Scaling

D. Shearing

View Answer

Ans : B

Explanation: Rotation is a process of changing the angle of the object.

2. Rotation is?

A. clockwise

B. anticlockwise

C. can be clockwise or anticlockwise

D. None of the above

View Answer

Ans : C

Explanation: Rotation can be clockwise or anticlockwise.

3. Rotation point is also called a?

A. clockwise point

B. anticlockwise point

C. object point

D. pivot point

View Answer

Ans : D

Explanation: Rotation point is also called a pivot point. It is print about which object is rotated.

4. How many types of rotation there?

A. 1

B. 2

C. 3

D. 4

View Answer

Ans : B

Explanation: Types of Rotation:Anticlockwise and Clockwise

5. The positive value of the pivot point (rotation angle) rotates an object in a?

A. Anticlockwise

B. Counterclockwise

C. Clockwise

D. Both A and B

View Answer

Ans : D

Explanation: The positive value of the pivot point (rotation angle) rotates an object in a counter-clockwise (anti-clockwise) direction.

6. When the object is rotated, then every point of the object is rotated by the same angle.

A. TRUE

B. FALSE

C. Can be true or false

D. Can not say

View Answer

Ans : A

Explanation: True, When the object is rotated, then every point of the object is rotated by the same angle.

7. Which of the following equation is correct for the new Y co-ordinate if an object undergoes 3D rotation around x axis?

A. Ynew = Yold x cosθ – Zold x sinθ

B. Ynew = Yold x sinθ – Zold x cosθ

C. Ynew = Yold x cosθ + Zold x sinθ

D. Ynew = Yold x sinθ + Zold x cosθ

View Answer

Ans : A

Explanation: The correct equation for the new Y co-ordinate if an object undergoes 3D rotation around x axis is – Ynew = Yold x cosθ – Zold x sinθ.
When the matrix form for 3D rotation around x axis is expanded then we get the following equations – Xnew = Xold; Ynew = Yold x cosθ – Zold x sinθ; Znew = Yold x sinθ + Zold x cosθ.

8. A two dimensional rotation is applied to an object by

A. Repositioning it along with straight line path

B. Repositioning it along with circular path

C. Both A and B

D. None of the above

View Answer

Ans : B

Explanation: A two dimensional rotation is applied to an object by repositioning it along with circular path.

9. Which of the following equation is correct for the new Z co-ordinate if an object undergoes 3D rotation around x axis?

A. Znew = Yold x sinθ – Zold x cosθ

B. Znew = Yold x sinθ + Zold x cosθ

C. Znew = Yold x cosθ – Zold x sinθ

D. Znew = Yold x cosθ + Zold x sinθ

View Answer

Ans : B

Explanation: The correct equation for the new Z co-ordinate if an object undergoes 3D rotation around x axis is – Znew = Yold x sinθ + Zold x cosθ. When the matrix form for 3D rotation around x axis is expanded then we get the following equations – Xnew = Xold; Ynew = Yold x cosθ – Zold x sinθ; Znew = Yold x sinθ + Zold x cosθ.

10. The negative value of the pivot point (rotation angle) rotates an object in a clockwise direction.

A. Yes

B. No

C. Can be yes or no

D. Can not say

View Answer

Ans : A

Explanation: Yes, The negative value of the pivot point (rotation angle) rotates an object in a clockwise direction.

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