List of top Questions asked in MHT CET- 2021

The major product obtained in the following reaction is Chlorobenzene + chlorine $\xrightarrow{\text{Anhydrous }\text{FeCl}_3}$ product (Major)
Ethers when dissolved in cold concentrated sulphuric acid forms
A bar magnet has length 3 cm, cross-sectional area $2\ \text{cm}^2$ and magnetic moment $3\ \text{A m}^2$. The intensity of magnetisation of the bar magnet is
The magnitude of flux linked with coil varies with time as $\phi = 3t^2 + 4t + 7$. The magnitude of induced e.m.f. at $t = 2\ \text{s}$ is
If we increase the frequency of an a.c. supply, then inductive reactance
An electron of mass 'm' and a photon have same energy 'E'. The ratio of de-Broglie wavelength of electron to the wavelength of photon is (c = velocity of light)
In biprism experiment, the $4^{\text{th}}$ dark band is formed opposite to one of the slits. The wavelength of light used is [d = separation between slits, D = distance between slits and screen]
At what rate a single conductor should cut the magnetic flux so that current of $1.5\ \text{mA}$ flows through it when a resistance of $5\ \Omega$ is connected across its ends?
Two parallel plates with dielectric placed between the plates are as shown in figure. The resultant capacity of capacitor will be [$A = \text{area of plate}$, $t_1, t_2$ and $t_3$ are thickness of dielectric slabs, $k_1, k_2$ and $k_3$ are dielectric constants.]
An electron is projected along the axis of a circular conductor carrying current $I$. The electron will experience
A thin ring of radius $R$ meter has charge $q$ coulomb uniformly spread on it. The ring rotates about its axis with a constant frequency of $f\ \text{rev s}^{-1}$. The magnetic induction at the center of the ring is
The temperature of a black body is increased by 50%, then the percentage increase in the rate of radiation by the body is approximated as
The fundamental frequency of an air column in pipe 'A' closed at one end coincides with the second overtone of pipe 'B' open at both ends. The ratio of the length of pipe 'A' to that of pipe 'B' is
A charged spherical conductor has radius $r$. The potential difference between its surface and a point at a distance of $3r$ from its centre is $V$. The electric field intensity at a distance of $3r$ from its centre is
A particle executing S.H.M. starts from the mean position. Its amplitude is $A$ and time period is $T$. At what displacement is its speed one-fourth of the maximum speed?
Which one of the following statements is wrong for an isobaric process?
In common emitter amplifier, a change of 0.2 mA in the base current causes a change of 5 mA in the collector current. If input resistance is 2 k$\Omega$ and voltage gain is 75, the load resistance used in the circuit is
The energy of an electron in the excited hydrogen atom is $-3.4\ \text{eV}$. Then according to Bohr's theory, the angular momentum of the electron in that excited state is ($h$ = Planck's constant)
Two rods of different metals have coefficients of linear expansion $\alpha_1$ and $\alpha_2$ respectively. Their respective lengths are $L_1$ and $L_2$. If at all temperatures $(L_2 - L_1)$ remains the same, the correct relation is
Figure shows triangular lamina which can rotate about different axes. The moment of inertia is maximum about the axis
For a perfectly black body, coefficient of emission is
A student is throwing balls vertically upwards such that he throws the $2^{\text{nd}}$ ball when the $1^{\text{st}}$ ball reaches maximum height. If he throws balls at an interval of 3 second, the maximum height of the balls is ($g = 10\ \text{ms}^{-2}$)
Two waves are represented by the equation, $y_1 = A \sin(\omega t + kx + 0.57)\ \text{m}$ and $y_2 = A \cos(\omega t + kx)\ \text{m}$, where $x$ is in metre and $t$ is in second. What is the phase difference between them?
An ideal gas at pressure 'p' is adiabatically compressed so that its density becomes twice that of the initial. If $\gamma = \frac{c_p}{c_v} = \frac{7}{5}$, then final pressure of the gas is
In the interference experiment using a biprism, the distance of the slits from the screen is increased by 25% and the separation between the slits is halved. If 'W' represents the original fringewidth, the new fringewidth is