You are here
Ex 10.3, 18 (MCQ) - Chapter 10 Class 12 Vector Algebra
Last updated at August 17, 2026 by Teachoo
Chapter 10 Class 12 Vector Algebra
Concept wise
- Scalar or vector
- Graphical displacement
- Type of vector
- Multiplication of a vector by a scalar
- Equal vectors
-
Unit vector
- Direction cosines and ratios
- Addition(resultant) of vectors
- Joining two points
- Section formula
- Right Angled triangle
- Collinearity Of two vectors
- Collinearity of 3 points or 3 position vectors
- Scalar product - Defination
- Scalar product - Projection
- Scalar product - Solving
- Vector product - Defination
- Vector product - Area
- Vector product - Solving
Transcript
Ex 10.3, 18 If ๐ โ is a nonzero vector of magnitude โaโ & ฮป a nonzero scalar, then ฮป๐ โ is unit vector if (A) ฮป = 1 (B) ฮป = โ 1 (C) a = |ฮป| (D) a = 1/|"ฮป" | Given, magnitude of vector ๐ โ is โaโ So, |๐ โ | = a For a non zero scalar โฮปโ ฮป๐ โ is a unit vector Magnitude of ฮป๐ โ is 1 So, |"ฮป" ๐ โ | = 1 |"ฮป" ||๐ โ | = 1 |"ฮป" | ๐ = 1 ๐ = 1/|"ฮป" | Hence, D is the correct answer.
