List of top Questions asked in KEAM

An orange solid (A) on heating gives a green residue (B), a colourless gas (C) and water vapours. The dry gas (C) upon passing over heated Mg gave a white solid (D) which upon subsequent reaction with water gave a gas (E) that gave dense white fumes with HCl. Identify
On passing silent electric discharge through oxygen in an ozonizer, 5.5 mol % of oxygen is converted to ozone. How many moles of O$_2$ and O$_3$ result when 35 moles of O$_2$ is originally present?
The carbon atoms in calcium carbide are held by
An example of a non-stoichiometric oxide when heated is
Rare gases are sparingly soluble in water because of
Acetic acid in liquid ammonia behaves as
The compound(s) that does(do) not exist is(are)
According to the VSEPR theory, the shape of ClO$_3^-$ would be
Consider a circular loop of radius R on the $xy$-plane carrying a steady current anticlockwise. The magnetic field at the center of the loop is given by
Consider two parallel current carrying conductors separated by a distance. Which one of the following statements is true?
Which hydride amongst the following has the least boiling point?
NO$^+$ has bond order
Which of the following sets has Lewis acid behaviour for all the components?
The energy gap is much more in silicon than in germanium because
A bat emits an ultrasonic sound wave at $33.0$ kHz and receives an echo $0.1$ s later. What is the distance of the bat from the object-producing echo? (Speed of sound in air is $330$ m/s)
A train sounds its whistle as it approaches an observer standing at a point near the track. The observer measures a frequency of $216$ Hz as the train approaches and a frequency of $184$ Hz as the train leaves. What is the frequency of its whistle?
A particle of mass \( m \) and charge \( q \) with an initial velocity \( \vec{v} \) is subjected to a uniform magnetic field \( \vec{B} \) along the vertical direction. The particle will
A wave along a string has the following equation $y = 0.05 \sin(28t - 2.0x)$ m (where $t$ is in seconds and $x$ is in meters). What are the amplitude, frequency and wavelength of the wave?
The following figure is the combination of logic gates. The inputs are A and B. The output is C. Which one of the following choices gives the correct matching?
A circuit is made using $R_1, R_2, R_3, R_4$ and a battery as shown in the following figure. Find the equivalent resistance of the given circuit and the current passing through $R_3$
The resistor $R_1 = 3 \ \Omega$ and $R_2 = 1 \ \Omega$ are connected in parallel to a 20 V battery. Find the heat developed in the resistor $R_1$ in one minute
The velocity and acceleration of a particle performing simple harmonic motion have a steady phase relationship. The acceleration shows a phase lead over the velocity in radians of
Consider a driven damped mechanical oscillator is in resonance. Which of the following statements is true?
A body undergoing simple harmonic motion has a maximum acceleration of \( 8\pi \text{ m/s}^2 \) and maximum speed of \( 1.6 \text{ m/s} \). What is the time period \( T \)?
Find the voltage and current passing through the resistor $R_2$ shown in the following circuit