Unit Vector and Direction Cosines MCQs
Unit Vector and Direction Cosines MCQs
Class: CBSE Class 12
Subject: Mathematics
Section: Vector Algebra
Topic: Unit Vector & Direction Cosines MCQs
Exam Focus: CBSE Board Examinations
Subject: Mathematics
Section: Vector Algebra
Topic: Unit Vector & Direction Cosines MCQs
Exam Focus: CBSE Board Examinations
Instructions: These Multiple Choice Questions (MCQs) are strictly based on the NCERT syllabus and are ideal for CBSE Class 12 Board Examination preparation. Detailed explanations are provided for clear concept understanding.
Q1. Unit vector magnitude is:
Answer: a)
Unit vector always has magnitude 1.
Unit vector always has magnitude 1.
Q2. Unit vector along a is:
Answer: a)
Q3. Direction cosines relate to:
Answer: a)
Q4. If l,m,n are DCs then:
Answer: a)
Q5. DCs of unit vector are:
Answer: a)
Q6. Angle with x‑axis cosine is:
Answer: a)
Q7. Position vector unit form:
Answer: a)
Q8. DCs determine:
Answer: a)
Q9. Sum of squares of DCs:
Answer: a)
Q10. Unit vector parallel to i:
Answer: a)
Q11. Vector magnitude using DCs:
Answer: a)
Q12. DCs of zero vector:
Answer: a)
Q13. If vector unit ⇒ DC relation:
Answer: a)
Q14. Angle between vector & axis from:
Answer: a)
Q15. Unit vector gives only:
Answer: a)
Q16. l,m,n called:
Answer: a)
Q17. Direction ratios proportional to:
Answer: a)
Q18. Unit vector perpendicular to plane:
Answer: a)
Q19. If |a|=5 ⇒ unit vector:
Answer: a)
Q20. DCs uniquely define:
Answer: a)
They specify orientation in space.
They specify orientation in space.