Answer : Option CExplaination / Solution:
Scalar product means dot product and dot product of 2 vectors gives a scalar , example dot product of force and displacement gives work which is scalar
Q2.The basic difference between a scalar and vector is one of
Answer : Option BExplaination / Solution:
Scalar quantity gives you an idea about how much of an object there is, but vector quantity gives you an indication of how much of an object there is and that also in which direction. So, the main difference between these two quantities is associated with the direction, i.e. scalars do not have direction but vectors do.
Q3.The picture of heat as a fluid was discarded in favor of the modern concept of heat as a form of energy because
Answer : Option CExplaination / Solution:
If heat were actually a substance, as many scientists of the time believed, it was difficult to see how so much of it could be produced during the boring of a metal cannon. Rumford showed that the amount of heat was not related to the quantity of filings produced
Answer : Option AExplaination / Solution:
A perfectly rigid body is hypothetical in nature but for some phenomena ( in rotational bodies ) we assume bodies are perfectly rigid i.e. the intermolecular forces are always in equilibrium irrespective of the external forces due to which their shape and size are constant.
Answer : Option DExplaination / Solution:
force is required to start a stationary object and to stop a moving object due to inertia. Inertia is a property of matter by which it continues in its existing state of rest or uniform motion in a straight line, unless that state is changed by an external force. This is also called law of inertia or newton's first law of motion
Answer : Option BExplaination / Solution:
The kinetic theory describes a gas as a large number of submicroscopic particles (atoms or molecules), all of which are in constant rapid motion that has randomness arising from their many collisions with each other and with the walls of the container.
It will applicable only for gases
Answer : Option BExplaination / Solution:
Heat is the amount of energy flowing from one body of matter to another spontaneously due to their temperature difference.
Q9.Measurement of a physical quantity is essentially the
Answer : Option BExplaination / Solution:
The Measurement of a given quantity is essentially an act or result of comparison between a quantity whose magnitude (amount) is unknown, with a similar quantity whose magnitude (amount) is known, the latter quantity being called a Standard.
Answer : Option AExplaination / Solution:
In oscillatory motion object moves to and fro about mean position periodically or after a particular interval of time.All oscillatory motions are periodic in nature.
Total Question/Mark :
Scored Mark :
Mark for Correct Answer : 1
Mark for Wrong Answer : -0.5
Mark for Left Answer : 0