Direction Cosines and Ratios MCQs
Direction Cosines and Ratios MCQs
Class: CBSE Class 12
Subject: Mathematics
Section: Three Dimensional Geometry
Topic: Direction Cosines & Direction Ratios MCQs
Exam Focus: CBSE Board Examinations
Subject: Mathematics
Section: Three Dimensional Geometry
Topic: Direction Cosines & Direction Ratios 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. Each answer includes a detailed explanation for concept clarity.
Q1. Direction cosines are:
Answer: a)
They are cosines of angles made with x, y, z axes.
They are cosines of angles made with x, y, z axes.
Q2. If l,m,n are DCs then:
Answer: a)
Q3. Direction ratios represent:
Answer: a)
Q4. DRs proportional to:
Answer: a)
Q5. If DRs = a,b,c ⇒ DCs:
Answer: a)
Q6. Sum squares of DCs:
Answer: a)
Q7. DCs of unit vector:
Answer: a)
Q8. DCs define:
Answer: a)
Q9. DRs of line joining (0,0,0) & (x,y,z):
Answer: a)
Q10. DC along x‑axis:
Answer: a)
Q11. DC along y‑axis:
Answer: a)
Q12. DC along z‑axis:
Answer: a)
Q13. Zero vector DCs:
Answer: a)
Q14. If DR doubled ⇒ DC:
Answer: a)
Q15. DCs lie between:
Answer: a)
Q16. DRs for parallel lines:
Answer: a)
Q17. Perpendicular lines DR condition:
Answer: a)
Q18. Angle between lines uses:
Answer: a)
Q19. DCs uniquely define:
Answer: a)
Q20. DRs useful in:
Answer: a)
Used to form line equations in space.
Used to form line equations in space.
