Assuming that Hund’s rule is violated, the bond order and magnetic nature of the diatomic molecule B2 is
(A) 1 and diamagnetic (B) 0 and diamagnetic
(C) 1 and paramagnetic (D) 0 and paramagnetic.
A gas bubble from an explosion under water,
oscillates with a period T proportional to
padbEc where p is the static pressure, d is
the density of water and E is the total energy
of explosion. Find the values of a,b, and c.
Which of the following sets cannot enter into
the list of fundamental quantities in any
system of units
(A) length ; mass ; velocity
(B) length ; time ; velocity
(C) mass ; time; velocity
(D) length ; time, mass
A physical quantity is measured and the result
is expressed as nu where u is the unit used
and n is the numerical value. If the result is
expressed in various units then :
(A) n ∝ size of u (B) n ∝ u2
(C) n ∝ u (D) n ∝ u
1
A block of mass m is on an inclined plane of angle θ. The coefficient of
friction between the block and the plane is μ and tan θ > μ. The block is held
stationary by applying a force P parallel to the plane. The direction of force
pointing up the plane is taken to be positive. As P is varied from P1 = mg (sin
θ – μ cos θ) to P2 mg (sin θ + μ cos θ), the frictional force f is
Consider a thin square sheet of side L and thickness t, made of a material of
resistivity ρ. The resistance between two opposite faces, shown by the shaded
areas in the figure is
(A) directly proportional to L
(B) directly proportional to t
(C) independent of L
(D) independent of t.