MAH-MHT CET (PCM/PCB) entrance exam Question Bank Solutions

Magnetic force on a closed current-carrying circuit placed in a uniform magnetic field is ______.

Semiconductors formed by doping germanium (Ge) with aluminium (Z = 13) and antimony (Z = 51) are ______.

If the length of potentiometer wire is increased, then the length of the previously obtained balance point will ______.

If the mass of the electron is reduced to half, the Rydberg constant ______.

In hydrogen spectrum, the wavelengths of light emitted in a series of spectral lines is given by the equation, `1/lambda` = R `(1/4^2 - 1/"n"^2)`, where n = 5, 6, 7...... and 'R' is Rydberg's constant. Identify the series and wavelength region.

Two students X and Y perform potentiometer experiment separately and null point was obtained as shown in diagram. During the experiment, ______.

1. X increases the value of R (resistance)
2. Y decreases the value of S (resistance)

The position of null point obtained by students X and Y respectively.

A student connected the circuit as shown in the figure to determine the internal resistance of a cell E1 by potentiometer (E > E1). He is unable to obtain the null point because ______.

In a potentiometer experiment when three cells A, B, C are connected in series the balancing length is found to be 740 cm. If A and B are connected in series, the balancing length is 440 cm and when B and C are connected in series, it is 540 cm. The e.m.f. of A, B, and C cells E_A, E_B, E_C are respectively (in volt) ______

A potentiometer wire is 4 m long and a potential difference of 3 V is maintained between the ends. The e.m.f. of the cell which balances against a length of 100 cm of the potentiometer wire is ______

A potentiometer wire of length 'L' and a resistance 'r' are connected in series with a battery of E.M.F. 'E₀' and a resistance 'r₁'. A cell of unknown E.M.F, 'E' is balanced at a length 'ℓ' of the potentiometer wire. The unknown E.M.F. E is given by ______ 

In the potentiometer experiment, the balancing length with a cell E₁ of unknown e.m.f. is 'ℓ₁' cm. By shunting the cell with resistance R Ω, the balancing length becomes `ℓ_1/2` cm, the internal resistance (r) of a cell is ______

In the potentiometer experiment, cells of e.m.f. E₁ and E₂ are connected in series (E₁ > E₂). the balancing length is 64 cm of the wire. If the polarity of E₂ is reversed, the balancing length becomes 32 cm. The ratio `E_1/E_2` is ______   

Two identical thin metal plates has charge q₁ and q₂ respectively such that q₁ > q₂. The plates were brought close to each other to form a parallel plate capacitor of capacitance C. The potential difference between them is ______.

Consider a light ray travelling in air is incident into a medium of refractive index `sqrt(2"n")`. The incident angle is twice that of refracting angle. Then, the angle of incidence will be ______.

The refracting angle of a prism is A and refractive index of the material of the prism is cot (A/2). Then the angle of minimum deviation will be ______.

What will be the effect on the root mean square velocity of oxygen molecules if the temperature is doubled and the oxygen molecule dissociates into atomic oxygen?

A parallel beam of light of wavelength 900 nm and intensity 100 wm^-2 is incident on a surface perpendicular to the beam. The number of photons crossing 1 cm² area perpendicular to the beam in one second is ______

Two cells of same emf but different internal resistances r₁ and r₂ are connected in series with a resistance R. The value of resistance R, for which the potential difference across second cell is zero, is ______.

If you are provided a set of resistances 2Ω, 4Ω, 6Ω and 8Ω. Connect these resistances so as to obtain an equivalent resistance of `46/3`Ω.

Which is the correct ascending order of wavelengths?