PART - 1 CH - 6 System of Particles and Rotational Motion — Physics STD 11 Science — Question

Read each statement below carefully and state with reasons, if it is true or false:
The magnitude of a vector is always a scalar,

The expansion in volume of a substance due to increase in temperature does not depend on the temperature difference.

For a body starting a constant accelerated motion from a stationary state, the graph between distance and time will be parabolic.

The coefficient of friction does not depend on the nature of the material and the roughness of the surfaces.

Read each statement below carefully and state, with reasons and examples, if it is true or false:

A scalar quantity is one that

Does not vary from one point to another in space.

In Bernoulli's principle, the sum of pressure energy, kinetic energy and potential energy is not a constant.

Read statement below carefully, and state, with reasons, if it is true or false:
The instantaneous speed of the point of contact during rolling is zero.

The square root of the ratio of the moment of inertia (I) of an object relative to a rotation axis and the total mass (M) of the object is called the radius of rotation relative to that rotation axis.

Read each statement below carefully and state, with reasons, if it is true or false:
The velocity vector of a particle at a point is always along the tangent to the path of the particle at that point.