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

A particle executes simple harmonic motion and is located at x = a, b, and c at times t₀, 2t_0, and 3t₀ respectively. The frequency of the oscillation is ______.

A thin semicircular conducting ring (PQR) of radius r is falling with its plane vertical in a horizontal magnetic field B, as shown in figure. The potential difference developed across the ring when its speed is v, is ____________.

The forbidden energy band gap in conductors, semiconductors and insulators are `"E"_("g"_1), "E"_("g"_2) "and"  "E"_("g"_3)` respectively. The relation among them is ____________.

An electron is accelerated through a potential difference of 10,000 V. Its de Broglie wavelength is, ______.

(nearly) (m_e= 9 x 10^-31 kg)

The electron in the hydrogen atom is moving with a speed of 1.5 x 10⁶ m/s in an orbit of radius 2 Å. Magnetic moment of the revolving electron is ____________.

A particle is executing simple harmonic motion with frequency f. The frequency at which its kinetic energy changes into potential energy is ______.

Instrument which measures alternating current is based on ____________.

A 60 `Omega` electric heater is connected to a 200 V, 50 Hz mains supply. The peak value of electric current flowing in the circuit is approximately ______.

Eddy currents are produced in a material when it is ____________.

The equation of a wave is y = 60 cos (1800t - 6x), where y is in microns, t in seconds, and x in metres. The ratio of maximum particle velocity to the wave velocity of wave propagation is ______.

Which one of the following properties is not possessed by a photon?

A coil having effective area A, is held with its plane normal to a magnetic field of induction B. The magnetic induction is quickly reduced to 25% of its initial value in 4 s. Then e.m.f. induced across the coil will be ____________.

A cyclist with combined mass 80 kg goes around a curved road with a uniform speed 20 m/s. He has to bend inward by an angle `theta` = tan^-1 (0.50) with the vertical. The force of friction acting at the point of contact of tyres and road surface is______.

[g = 10 m/s2 ]

A conducting circular loop is placed in a uniform magnetic field 0.02 T with its plane perpendicular to the magnetic field. The radius of the loop starts shrinking at 2 mm/s. The induced e.m.f. in the loop when the radius is 2 cm will be ____________.

What is the r.m.s. value of an alternating current which when passed through a resistor produces heat which is four times of that produced by a direct current of 3 ampere in the same resistor?

In a hydrogen atom, an electron of charge e revolves in a orbit of radius r with speed v. Then, the magnetic moment associated with electron is ______.

Equation of a plane progressive wave is given by `"y" = 0.6  "sin"2pi ("t" - "x"/2)`. On reflection from 48. denser medium its amplitude become `2/3` of the amplitude of the incident wave. The equation of the reflected wave is ____________.

The maximum safe speed, for which a banked road is intended, is to be increased by 20 %. If the angle of banking is not changed, then the radius of curvature of the road should be changed from 30 m to ____________.

A horizontal circular platform of mass 100 kg is rotating at 5 r.p.m. about vertical axis passing through its centre. A child of mass 20 kg is standing on the edge of platform. If the child comes to the centre of platform then the frequency of rotation will become ______.

A pendulum has length of 0.4 m and maximum speed 4 m/s. When the length makes an angle 30° with the horizontal, its speed will be ______.
`[sin  pi/6 = cos  pi/3 = 0.5 and "g" = 10 "m"//"s"^2]`