If $q$ is false and $p \wedge q \leftrightarrow r$ is true,then which one of the following statements is a tautology?

What is the major product of the following reaction?

$A$ conducting square loop of side $L$ and resistance $R$ moves in its plane with a uniform velocity $v$ perpendicular to one of its sides. $A$ magnetic induction $B$,constant in time and space,pointing perpendicular and into the plane of the loop,exists everywhere with half the loop outside the field,as shown in the figure. The induced $emf$ is

Which is the best material for studying mitosis in a laboratory?

The inverse point of $(1,2)$ with respect to the circle $x^2+y^2-4x-6y+9=0$ is

The oxide of nitrogen formed by thermal decomposition of $NH_4NO_3$ is