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

The moment of inertia of a circular disc of mass M and radius R about an axis passing through the centre of mass is I₀. The moment of inertia of another circular disc of same mass and thickness but half the density about the same axis is ______.

The maximum range for the tropospheric transmission of radio wave of wavelength 3m using the transmitting antenna and receiving antenna of heights 100m and 60m respectively is ______.

For the same cross-sectional area and for a given load, the ratio of depressions for the beam of a square cross-section and circular cross-section is ______.

A broadcast radio transmitter radiates 12 kW when percentage of modulation is 50%, then the unmodulated carrier power is ______.

A sphere of mass 'm' moving with velocity 'v' collides head-on another sphere of same mass which is at rest. The ratio of final velocity of second sphere to the initial velocity of the first sphere is ______. ( e is coefficient of restitution and collision is inelastic)

A big water drop is formed by the combination of 'n' small water drops of equal radii. The ratio of the surface energy of 'n 'drops to the surface energy of big drop is ______.

Which of the following quantity does not change due to damping of oscillations?

A disc of radius R and thickness `"R"/6` has moment of inertia/about an axis passing through its centre and perpendicular to its plane. Disc is melted and recast into a solid sphere. The moment of inertia of a sphere about its diameter is ______.

The moment of inertia of a body about a given axis is 1.2 kg-m². Initially, the body is at rest. In order to produce, a rotational kinetic energy of 1500 J, an acceleration of 25 rad/s² must be applied about that axis for a duration of ______.

A straight solenoid has 50 turns per cm in primary and 200 turns per cm in the secondary. The area of cross-section of the solenoid is 4 cm². The mutual inductance is ______.

A power transmission line feeds input power at 2300 V to a stepdown transformer with its primary windings having 4000 turns. What should be the number of turns in the secondary in order to get output power at 230 V?

Three identical blocks A, B and C are placed on horizontal frictionless surface. The blocks A and C are at rest. But A is approaching towards B with a speed 10 m/s. The coefficient of restitution for all collision is 0.5. The speed of the block C just after the collision is ______.

A water-proofing agent changes the angle of contact ______

In an LC circuit ______

The angle of contact for a liquid which wets the surface of a solid is ____________.

Which of the following statements is incorrect?

What is the angle between resultant of A + B and A x B.

What will be the angle of contact of a liquid relative to a solid if forces of adhesion and cohesion are equal?

Each plate of a parallel plate condenser has surface area of 5 cm². The distance between the plates is 2 mm. The dielectric constant of the medium between the plates is 5. Then the capacity of the condenser is ____________.

(`epsilon_0 = 8.85  xx 10^-12 C^2//Nm^2`)

For an ideal gas with initial pressure and volume P_i and V_i respectively, a reversible isothermal expansion happens, when its volume becomes V₀. Then it is compressed to its original volume V_i by a reversible adiabatic process. If the final pressure is P_f then which of the following statements is true?