Which of the following is/are a vector quantity?

  1. Temperature
  2. Work
  3. Kinetic Energy
  4. Momentum
  5. Power

Select the correct option from codes given below:

Answer: [B] 4 Only

A scalar quantity is one which has only magnitude. A vector quantity has both magnitude and direction.
Temperature is a comparative measure of hot or cold and is expressed in Celsius, Fahrenheit and kelvin, which represents only magnitude and no direction.Hence temperature, is a scalar quantity.
Work is again a scalar quantity because W=F.S where F is force which is a vector quantity and S is displacement which is again a vector quantity.So, dot product of two vector quantity is a scalar quantity.
Power is again a scalar quantity as Power is defined as rate of work done
P=W/T, A scalar quantity divided by scalar is scalar.
Momentum is M=m.v where m is the mass of the body which is scalar quantity and v is the velocity which is vector quantity. Dot product of scalar and vector is vector.
K.E=1/2 mv^2, where v^2 is the dot product of two vector quantity and hence is scalar. Dot Product of two vector quantity is scalar.

This question is a part of GKToday's Integrated IAS General Studies Module