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

Sensitivity of a given potentiometer can be decreased by ______.

Three identical coils X, Y and Z are placed with their planes parallel to each other. Coils X and Z carry current as shown in the figure. Coils X and Y are fixed and coil Z is moved towards Y, then ______.

A potentiometer wire of length 100 cm has a resistance of 10 `Omega.` It is connected in series with a resistance and an accumulator of e.m.f 2 V and of negligible internal resistance. A source of e.m.f 10 mV is balanced against a 40 cm length of the potentiometer wire. The value of the external resistance is ____________.

Let the series limit for Balmer series be 'λ₁' and the longest wavelength for Brackett series be 'λ₂'. Then λ₁ and λ₂ are related as ______.

Ratio of pressures exerted by two gases is 4 : 3 and their densities are in the ratio 3 : 4. The ratio of their R.M.S. velocities is ____________.

Which of the following transition will have highest emission frequency?

The temperature at which the molecules of nitrogen will have the same r.m.s. velocity as the molecules of oxygen at 327° C is ____________.

The length of a wire of a potentiometer is 100 cm, and the e.m.f of its standard cell is E volt. It is employed to measure the e.m.f of a battery whose internal resistance is 0.5 `Omega` If the balance point is obtained at `l`= 30 cm from the positive end, the e.m.f of the battery is ____________.

where 'i' is the current in the potentiometer

A potentiometer wire is 10 m long and has resistance of 2`Omega`/m. It is connected in series with a battery of e.m.f 3 V and a resistance of 10 `Omega`. The potential gradient along the wire in V/m is ______.

When two cells of e.m.f 1.5 V and 1.1 V connected in series are balanced on a potentiometer, the balancing length is 260 cm. The balancing length, when they are connected in opposition is (in cm) ____________.

The energy (in eV) required to excite an electron from n = 2 to n = 4 state in hydrogen atom is ____________.

A loop of flexible conducting wire lies in a magnetic field of 4.0 T with its plane perpendicular to the field. The length of the wire is 1 m. When a current of 2.2 A is passed through the loop, it opens into a circle, then the tension developed in the wire is ____________.

In the given figure, battery E is balanced on 55 cm length of potentiometer wire but when a resistance of 10 `Omega` is connected in parallel with the battery, then it balances on 50 cm length of the potentiometer wire. The internal resistance r of the battery is ____________.

A donor impurity results in ______.

A potentiometer wire of length 100 cm and resistance 3 `Omega` is connected in series with resistance of 8 `Omega` and an accumulator of 4 volt whose internal resistance is 1 `Omega`.

A horizontal spring executes S.H.M. with amplitude 'A₁', when mass 'm₁' is attached to it, When it passes through mean position another mass 'm₂' is placed on it. Both masses move together with amplitude 'A₂'. Therefore A₂ : A₁ is ______ 

A mass M attached to a horizontal spring executes S.H.M. of amplitude A₁. When the mass M passes through its mean position, then a smaller mass m is placed over it and both of them move together with amplitude A₂. The ratio of `(A_1/A_2)` is ______ 

An electron accelerated through potential difference 'V' passes through a uniform transverse magnetic field and experiences a force 'F'. If the accelerating potential in increased to '2V', the electron in the same magnetic field will experience a force ____________.

In Melde's experiment, when the wire is stretched by an empty pan, four loops are obtained and when a six-gram weight is added to the pan, the number of loops becomes one. The mass of pan is ______

The correct statement about stationary waves is that ______