## Book Store

Currently only available for.
CBSE Gujarat Board Haryana Board

## Previous Year Papers

Download the PDF Question Papers Free for off line practice and view the Solutions online.
Currently only available for.
Class 10 Class 12
Read each statement below carefully and state, with reasons and examples, if it is true or false:
A scalar quantity is one that
(a) is conserved in a process.

(b) can never take negative values.

(c) must be dimensionless.

(d) does not vary from one point to another in space.
(e) has the same value for observers with different orientations of axes.

(a) False -  When we carry out the adiabatic process, the scalar quantity temperature does not conserve.

In inelastic collisions, the K.E. (scalar quantity) does not conserve.

(b) False - scalar quantity can have negative value e.g. .

If the angle between  is greater than then W will be negative e.g. work done by gravitational force when body is raised upward is negative.

(c) False -  Scalar quantity may have dimensions, e.g. Dimensional formula of work is [M1L2T-2].

(d) False - Temperature is a scalar quantity and it changes as we go higher, the gravitational potential is a scalar quantity and it varies with the height.

(e) True.
152 Views

What is a vector quantity?

A physical quantity that requires direction along with magnitude, for its complete specification is called a vector quantity.
835 Views

What is a scalar quantity?

A physical quantity that requires only magnitude for its complete specification is called a scalar quantity.
1212 Views

Give three examples of scalar quantities.

Mass, temperature and energy
769 Views

What are the basic characteristics that a quantity must possess so that it may be a vector quantity?

A quantity must possess the direction and must follow the vector axioms. Any quantity that follows the vector axioms are classified as vectors.

814 Views

Give three examples of vector quantities.

Force, impulse and momentum.
865 Views