List of top Questions asked in KEAM- 2025

Types of system and their definitions are given below. Choose the correct match from the following codes:
System:
(a) Closed system
(b) Open system
(c) Isolated system
(d) Homogeneous system
(e) Heterogeneous system
Definition:
(i) A system which can exchange both energy and matter with surrounding
(ii) A system which cannot exchange matter or energy with surrounding
(iii) A system consisting of single phase
(iv) A system consisting of many phases
(v) A system which can exchange only energy with surrounding
Which of the following molecule has zero dipole moment?
Which of the following statement is INCORRECT with p-block elements?
Which of the following statement is NOT true with Bohr's model of atom?
When the uncertainty in momentum is zero then the uncertainty in the position of a particle is
Which of the following has the highest molar mass? \((\text{Atomic masses: N}=14,\ \text{O}=16,\ \text{Ag}=108,\ \text{Pb}=208,\ \text{Na}=23,\ \text{H}=1,\ \text{K}=39)\)
The pn junction diode acts as a rectifier because:
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):
Light of wavelength \(\frac{36}{5R}\,\text{m}\) is emitted by a hydrogen atom during the transition of electrons from the state
The ratio between the wavelengths of the air column vibrating in the first two modes in an open organ pipe is
Above the threshold frequency, if the intensity of incident light falling on a photo sensitive material is increased, then the correct statement is:
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 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 \(\text{W m}^{-2}\))
The power required to push the arm of a rectangular conductor with a constant speed \(v\) in a motor is directly proportional to
In synchrotron, the required high magnetic fields are generated by
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
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)
Mobility is the drift velocity per unit
The rms value of a.c with peak value of \(200\) V is
The magnitude of the torque experienced by an electric dipole of dipole moment \(P\) placed at an angle of \(30^\circ\) in a uniform electric field \(E\) is