The core of a transformer is laminated, so as to

A slit of width 'd' is illuminated by red light of wavelength 650 nm. What should be the value of slit width 'd' so that first minimum fall at an angle of diffraction of \(\frac{\pi}{6}\) ?

The focal length of a lens depends on

In a step down Transformer :

At a certain place, the horizontal component is \(B_0\) and the vertical component is \(V_0\). If \(B_0 = V_0\) then the total magnetic field at that place will be :

Assume the earth to be a spherical conductor of radius 6400 km. Calculate the capacitance of earth.

The instantaneous magnetic flux linked with a coil is given by \(\phi = (15t^3 - 100t^2 + 40)\) Wb. The emf induced in the coil at time \(t = 1\) s is :

Area (in sq. units) of the region bounded by curves \(y^2=x\) and \(x=4\) is

The molecular formula of dodecacarbonyltrimanganese \((0)\) is:

A telescope has an eye piece of focal length 5.0 cm. The objective lens has focal length 12 times that of the eye-piece. In normal adjustment, what is the separation between the two lenses?

If in a binomial distribution \(n=4, P(X=0)=\frac{16}{81}\), then \(P(X=4)\) equals :

Electrical disintegration or Bredig's Arc method involves

Read the passage carefully and answer the questions
The transition metals and their compounds are known for their catalytic activity. This activity is ascribed to their ability to adopt multiple oxidation states and to form complexes. Vanadium(V) oxide (in Contact Process), finely divided iron, and nickel (in Catalytic Hydrogenation) are some of the examples. Catalysts at a solid surface involve the formation of bonds between reactant molecules and atoms of the surface of the catalyst (first row transition metals utilise 3d and 4s electrons for bonding). This has the effect of increasing the concentration of the reactants at the catalyst surface and also weakening of the bonds in the reacting molecules (the activation energy is lowering). Also because the transition metal ions can change their oxidation states, they become more effective as catalysts.
Which of the following is incorrect about the ability of catalytic action of transition metals?