List of top Questions asked in MHT CET

The output Y, when all the three inputs are first high and then low, will respectively be

An element has two isotopes of mass numbers \(65\) and \(67\) with abundances of \(25\%\) and \(75\%\) respectively. Then the average atomic mass of the element is

In an intrinsic semiconductor, at any ordinary temperature, the correct relation between the number of electrons per unit volume (\(n_{e}\)) and number of holes per unit volume (\(n_{h}\)) is

Energy of the incident photon on the metal surface is \(3W\) and then \(5W\), where \(W\) is the work function of that metal. The ratio of velocities of emitted photoelectrons is

When photons of energy \(h\nu\) fall on a metal plate of work function \(W_{0}\), photoelectrons of maximum kinetic energy K are ejected. If the frequency of radiation is doubled, the maximum kinetic energy of ejected photoelectrons will be

If \(\lambda _{1}\) and \(\lambda _{2}\) are the wavelengths of the first members of the Lyman and Paschen series respectively then \(\lambda _{1}:\lambda _{2}\) is

In hydrogen atom, an electron jumps from higher orbit to lower orbit so that radius of the lower orbit is \(\left(\frac{1}{4}\right)^{\text{th}}\) of radius of higher orbit. If speed of electron in higher orbit was V, then speed in lower orbit is

The distance of a point on the screen from two slits in biprism experiment is \(1.8\times 10^{-5}\) m and \(1.23\times 10^{-5}\) m. If wavelength of light used is \(6000\) Å the fringe number formed at that point is

An equilateral prism deviates a ray through \(45^{\circ }\) for the two angles of incidence differing by \(20^{\circ }\). One of the angle of incidence is

If Young's double slit experiment is performed in water

Interference fringes are produced on a screen by using two light sources of intensities I and 9I. The phase difference between the beams is \(\frac{\pi }{2}\), at point P and \(\pi\) at point Q on the screen. The difference between the resultant intensities at points P and Q is \(\left(\cos \frac{\pi }{2}=0,\,\cos \pi =-1\right)\)

A current of \(5\) A is flowing at \(220\) V in the primary coil of a transformer. If the voltage produced in the secondary coil is \(2200\) V and \(50\%\) of power is lost, then the current in secondary will be

A square of side L metre lies in the XY plane in a region, where the magnetic field is \(\vec{B}=B_{0}(2\hat{i}+3\hat{j}+4\hat{k})\), where \(B_{0}\) constant. The magnitude of flux passing through the square is

A \(10\ \mu\)F capacitor is charged to \(25\) V of potential. The battery is then disconnected and a pure \(100\) mH coil is connected across the capacitor so that L-C oscillations are set up. The maximum current in the coil is

An arc lamp requires a direct current of \(10\) A at \(90\) V to function. If it is connected to \(220\) V (rms), \(50\) Hz a.c. supply, the series inductor needed for it to work is nearly

An alternating voltage is \(E=100\,\sin \left(\omega t+\frac{\pi }{6}\right)\) V. The voltage will be maximum for the first time when t is
\(\left(\sin \frac{\pi }{2}=1\right)\) (T = Periodic time)

Two parallel long wires carry currents \(i_{1}\) and \(i_{2}\) with \(i_{1}>i_{2}\). When the currents are in the same direction, the magnetic field at a point midway between the wires is \(10\ \mu\)T. If the direction of \(i_{2}\) is reversed then the field becomes \(30\ \mu\)T. The ratio \(\frac{i_{1}}{i_{2}}\)

The self induced e.m.f. of a coil is \(25\) V. When the current in it is changed at uniform rate from \(10\) A to \(25\) A in \(1\) s, the change in the energy of the inductance is

A particle carrying a charge equal to \(100\) times the charge of an electron is rotating one rotation per second in a circular path of radius \(0.8\) m. The value of magnetic field produced at the centre will be (\(\mu _{0}\) = permeability of free space)

In balanced meter bridge, the resistance of bridge wire is \(0.1\ \Omega /\)cm. Unknown resistance \(X\) is connected in the left gap and \(6\ \Omega\) in right gap. Null point divides the wire in the ratio \(2:3\). The current drawn from the battery of \(5\)V having negligible resistance is

An infinite line charge produces a field of \(9\times 10^{8}\) N/C at a distance of \(2\) cm. The linear charge density is
\(\left(\frac{1}{4\pi \varepsilon _{0}}=9\times 10^{9}\text{ SI unit}\right)\)

A capacitor of \(20\ \mu\)F is charged up to \(500\) V is connected in parallel with another capacitor of \(10\ \mu\)F which is charged up to \(200\) V. Then, the common potential will be

The electric field intensity at a point near and outside the surface of a charged conductor of any shape is \(E_{1}\). The electric field intensity due to a uniformly charged infinite thin plane sheet having the same surface charge density is \(E_{2}\). The relation between \(E_{1}\) and \(E_{2}\) is

A galvanometer of resistance \(50\ \Omega\) is connected to a battery of \(3\)V along with a resistance of \(2950\ \Omega\) in series. A full scale deflection of \(30\) divisions is obtained in the galvanometer. To reduce this deflection to \(20\) divisions, the resistance in series should be