List of top Questions asked in KEAM- 2024

In a radioactive decay, the fraction of the number of atoms left undecayed after time \( t \) is:
The energy required by the electron to cross the forbidden band for Germanium is:
The rate constant of a first order reaction is \(4.606 \times 10^{-3} \, {s}^{-1}\). The time taken to reduce 20 g of reactant into 2 g is:
The wavelength of the de Broglie wave (in meter) associated with a particle of mass \(m\) moving with \(\frac{1}{10}\) of the velocity of light is (h = Planck's constant, c = velocity of light):
The rate law for the reaction, A + B → Product, is: \[ {rate} = [A][B]^{3/2} \] The total order of the reaction is:
The dimensions of torque are:
The constancy of the binding energy per nucleon in medium-sized nuclei is due to:
The valence electron MO configuration of \( {C}_2 \) (atomic number of C = 6) molecule is:
A particle of mass 40 g executes simple harmonic motion with an amplitude of 2.0 cm. If the time period of oscillation is \( \frac{\pi}{20} \) s, the total mechanical energy of the system is:

The increasing order of acid strength of the following carboxylic acids is: 
\[ (i) \text{(CH}_3\text{)}_3\text{C-COOH} \quad (ii) \text{(CH}_3\text{)}_2\text{CH-COOH} \quad (iii) \text{CH}_3\text{CH}_2\text{COOH} \]

The kinetic energy of a body is increased by 21%. The percentage increase in its linear momentum is:

The time period of revolution of a planet around the sun in an elliptical orbit of semi-major axis \( a \) is \( T \). Then:
In an incompressible liquid flow, mass conservation leads to:
Which of the following is used as an insect attractant?
A ball is thrown up vertically at a speed of 6.0 m/s. The maximum height reached by the ball (Take \( g = 10 { m/s}^2 \)) is:
In the electron emission process, \( _{Z}^{A}X \rightarrow _{Z+1}^{A}Y + e^{-} + \bar{\nu} \), the particle \( q \) emitted along with the electron is:

The type of processes represented by the curves X and Y are: 

The INCORRECT statement is:
The decreasing order of first ionization enthalpy of the following elements is:
One mole of an alkene on ozonolysis gives a mixture of one mole pentan-3-one and one mole methanal. The alkene is:
The molarity of sodium hydroxide in the solution prepared by dissolving 6 g in 600 mL of water is (molar mass of NaOH = 40 g mol\(^{-1}\)):
The hybridization involved in the metal atom of \([CrF_6]^{3-}\) is:
Which of the following is used as anode in mercury cell?
In a process, 600 J of heat is absorbed by a system and 375 J of work is done by the system. The change in internal energy of the process is:
When an \( \alpha \) particle and a proton are projected into a perpendicular uniform magnetic field, they describe circular paths of the same radius. The ratio of their respective velocities is: