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

A rigid body is rotating with angular velocity 'ω' about an axis of rotation. Let 'v' be the linear velocity of particle which is at perpendicular distance 'r' from the axis of rotation. Then the relation 'v = rω' implies that ______.

The potential difference (V_A - V_B) between the points A and B in the given figure is ______.

What determines the conventional direction of the product of current and resistance while applying the Kirchhoff's law?

Angular displacement (θ) of a flywheel varies with time as θ = at + bt² + ct³ then angular acceleration is given by ____________.

If a cyclist doubles his speed while negotiating a curve, how does the tendency to overturn vary? 

A junction diode of internal resistance 20 Ω is used for half-wave rectification. If the applied voltage has a peak value of 50 V and load resistance is 800 Ω, then d.c. value of current is ____________.

An engine requires 5 seconds to go from a speed of 600 r.p.m. to 1200 r.p.m. How many revolutions does it make in this period?

The maximum efficiency of full-wave rectifier is ____________.

A particle performs uniform circular motion in a horizontal plane. The radius of the circle is 10 cm. If the centripetal force F is kept constant but the angular velocity is halved, the new radius of the path will be ______.

Gauss' law helps in ____________.

In figure, the input is across the terminals A and C and the output is across B and D. Then, the output is ____________.

What is the value of output voltage V₀ in the given circuit?

A coil of 25 turns is pulled in 0.05 s between the poles of a magnet, where its area includes `21 xx106-6 "Wb"  "to" 1 xx 10^-6  "Wb"`. The average e.m.f. is ______.

A body of mass m is performing a UCM in a circle of radius r with speed v. The work done by the centripetal force in moving it through `(2/3)`rd of the circular path is ______.

Which of the following is the dimensional formula for electric polarisation?

A body of M.I. 2 kg m² rotates with an angular velocity of 20 rad/s. When an external torque of 0.5 N m acts on it in the opposite direction, the number of revolutions it makes before it comes to rest is ____________.

In a coil of resistance 150 `Omega`, a current is induced by changing the magnetic flux through it as shown in the figure. The magnitude of change in flux through the coil is ____________.

In negotiating curve on a flat road, a cyclist leans inwards by an angle e with the vertical in order to ______.

A body is moving along a circular track of radius 100 m with velocity 20 m/s. Its tangential acceleration is 3 m/s² then its resultant accelaration will be ______.

A metal sphere of radius 1 m is charged with 10^-2 C in air. Its bulk modulus is `10^11/(4pi^2) "N"/"m"^2`. The volume strain in the sphere is (ε₀ = permittivity of free space.)