List of practice Questions

In Boolean algebra, \( A \cdot B \) is equal to
Radar waves are sent towards a moving airplane and the reflected waves are received. When the airplane is moving towards the radar, the wavelength of the wave
The transmission of high frequencies in a coaxial cable is determined by
The output stage of a television transmitter is most likely to be a
The antenna current of an AM transmitter is 8A when only the carrier is sent, but it increases to 8.93A when the carrier is modulated by a single sine wave. Find the percentage modulation.
Two identical P-N junctions are connected in series in three different ways as shown below to a battery. The potential drop across the P-N junctions are equal in
The temperature coefficient of a zener mechanism is
Two electrons moving in opposite direction with speeds 0.8c and 0.4c where \( c \) is the speed of light in vacuum. Then the relative speed is about
A photo-sensitive material would emit electrons if excited by photons beyond a threshold. To overcome the threshold, one would increase
The radius of nucleus is
Radio carbon dating is done by estimating in specimen
Ionization power and penetration range of radioactive radiation increases in the order
The half-life of a radioactive element is 3.8 days. The fraction left after 19 days will be
Indicate which one of the following statements is NOT CORRECT?
Identify the graph which correctly represents Moseley's law.
Assuming \( f \) to be the frequency of the first line in Balmer series, the frequency of the immediate next (i.e., second) line is
The velocity of a particle at which the kinetic energy is equal to its rest energy is
One electron and one proton are accelerated by equal potential. Ratio in their deBroglie wavelength is
The magnetic moment of the ground state of an atom whose open sub-shell is half-filled with five electrons is
A particular solution of $ \frac{dy}{dx} = (x+9y)^2$ when $ x = 0, y = \frac{1}{27}$ is
The imaginary part of $\frac{\left(1+i\right)^{2}}{i\left(2i-1\right)} $ is
The potential energy of a simple harmonic oscillator, when the particle is half way to its end point is (where $ E $ is the total energy)
Two rings of radius $R$ and $n R$ made of same material have the ratio of moment of inertia about an axis passing through centre in $1: 8$. The value of $n$ is
The cyclotron frequency of an electron grating in a magnetic field of $1 \,T$ is approximately
In the circuit, the potential difference across $PQ$ will be nearest to