For most of the surfaces used in daily life, the frition coefficient is less than 1. Is it always necessary that the friction coefficient is less than 1?

A sphere can roll on a surface inclined at an angle theta if the friction coefficient is more than (2)/(7) g sin theta . Suppose the friction coefficient is (1)/(7) g sin theta , and a sphere is released from rest on the incline,

How much -7 less than -1 ?

If respiratory quotient is less than 1, what is the respiratory substrate?

Define the term refractive index of a medium. Can it be less than 1 ?

These questions consists of two statements each printed as Assertion and Reason. While answering these question you are required to choose any one of the following four responses Assertion Static friction acting on a body is always greater than the kinetic friction acting on this body. Reason Coefficient of static friction is more than the coefficient of kinetic friction.

The latent heat of fusion of a substance is always less than the latent heat vapourization . Explain.

The probability of intersection of two events A and B is always less than or equal to those favourable to the event A.

A : Coefficient of performanceof a refreigerator is always greater than 1. R : Efficiencyof heat engine is greater than 1.