A radioactive material with half life of 6.25 years undergoes beta decay. How much fraction of material is decayed after 25 years:

The velocity and acceleration vectors of a particle moving in a magnetic field are given by : \(\vec{v}=3 \hat{i}+4 \hat{j}\) and \(\vec{a}=2 \hat{i}+\hat{j}\) respectively, Then :
(A) the magnetic field is along \(z\)-direction
(B) \(v=3\)
(C) the kinetic energy of the particle is constant
(D) the acceleration is in x-z plane
(E) the particle is moving in \(x-y\) plane

Two cells each of emf E and internal resistance r are connected in such a way that their positive terminals are connected to point X and negative terminals are connected to point Y. The potential difference between X and Y is

A bar magnet falls freely from a height of 9.8 m through a metal ring. Its acceleration will be equal to

Maxwell's displacement current is

If two slits have width ratio 1 : 4. The ratio of maximum to minimum intensities in the interference pattern would be:

A resistor connected to a battery is heated due to the current. The quantity which does not change is

Observe the illustration and answer the following question:

Meiotic division in primary oocytes is arrested at:

Which one of the following regions is not present in transcriptional unit of DNA

The line of sight distance for two antennas of height 100 m and 400 m above earth surface is approximately: (Given \( R = 6400 \text{ km}, \sqrt{20} = 4.5 \))

An organic compound (A), C9H10O, gives a 2,4-DNP reaction, negative Tollens' test and iodoform test. On drastic oxidation with chromic acid, it forms B, having molecular formulae, C7H6O2. Identify A and B.

Reaction of Ethene with Bromine in CCl\(_4\) will result in

Read the Passage carefully and answer the questions
When a ligand is bound to a metal ion through a single donor atom, it is said to be a unidentate ligand but when it bind through two donor atoms, then it is said to be didentate ligand and when several donor atoms are present in a single ligand, it is said to be a polydentate ligand. When a dior polydentate ligand uses its two or more donor atoms simultaneously to bind a single metal ion, it is said to be a chelate ligand. The number of such ligating groups is called the denticity of the ligand. ligand which has two different donor atoms and either of the two ligetes in the complex is called ambidentate ligands. The number of ligand donor atoms to which the metal is directly bonded, is called coordination number of the metal ion in the complex. Complexes in which a metal is bound to only one kind of donor groups are known as homoleptic and in which a metal is bound to more than one kind of donor groups are known as heteroleptic complexes.
Which among the following is an ambidentate ligand?