List of top Questions asked in KEAM- 2025

Which of the following statement is INCORRECT with p-block elements?

Given: $\Delta_r H^{+}(\text{Ag}^+)=105.6\ \text{kJ mol}^{-1}$, $\Delta_r H^{+}(\text{Cl}^-)=-167.2\ \text{kJ mol}^{-1}$, and $\Delta_r H^{+}(\text{AgCl})=-127.1\ \text{kJ mol}^{-1}$, find the value of $\Delta_r H$.

The question text is cut off in the image, so the full data for this question is not visible. Only the ending part
“\(\dots\) mole of \(CH_3COONa\). The \([H^+]\) in the resultant solution is”
and the given value
\[ K_a(CH_3COOH)=1.1\times 10^{-5} \] are visible. Therefore, the complete numerical information needed to solve this question is missing.

The pn junction diode acts as a rectifier because:

When the uncertainty in momentum is zero then the uncertainty in the position of a particle is

Which of the following statement is NOT true with Bohr's model of atom?

The I-V characteristic of a semiconductor diode in forward bias is a/an:

\( 75\% \) of \( ^{234}_{90}\text{Th} \) decays in \( t \) years. Its half-life is (in years):

Which of the following has the highest molar mass? \((\text{Atomic masses: N}=14,\ \text{O}=16,\ \text{Ag}=108,\ \text{Pb}=208,\ \text{Na}=23,\ \text{H}=1,\ \text{K}=39)\)

Above the threshold frequency, if the intensity of incident light falling on a photo sensitive material is increased, then the correct statement is:

Light of wavelength \(\frac{36}{5R}\,\text{m}\) is emitted by a hydrogen atom during the transition of electrons from the state

Plane polarized light can be produced by the phenomenon of

At the lowest point of the plot of angle of deviation versus the angle of incidence of a triangular prism, the angle of incidence is equal to

If two waves of equal amplitude \( A \) and opposite phase interfere, the amplitude of the resultant wave is

The ratio between the wavelengths of the air column vibrating in the first two modes in an open organ pipe is

For a circular coil carrying current, the thumb in the right hand thumb rule gives the direction of

Gyromagnetic ratio of an electron is the ratio between

In synchrotron, the required high magnetic fields are generated by

The power required to push the arm of a rectangular conductor with a constant speed \(v\) in a motor is directly proportional to

The transverse nature of electromagnetic waves is confirmed by the phenomenon of

A \(1\) kW bulb radiates light uniformly in all directions. The intensity at a point on the surface of the surrounding sphere of area \(200\,\text{m}^2\) is (in \(\text{W m}^{-2}\))

Mobility is the drift velocity per unit

The rms value of a.c with peak value of \(200\) V is

The resistivity of a metallic wire is directly proportional to (T – temperature; \( \tau \) average time of collisions of free electrons; \( n \) – number of free electrons per unit volume; \( A \) – area of cross-section)

If the work done in moving a charge of \( 3\,C \) from A to B is \( 12\,J \), then the potential difference between A and B is