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

Shown in the figure below is a metre bridge set up with null deflection in the galvanometer. The value of the unknown resistance R is ______

A thin light weight rod of diamagnetic substance such as silver is suspended in uniform external magnetic field. It will align itself with its length ______.

The direction of the magnetic field produced around a long straight conductor is given by ______

A block of mass m attached to one end of the vertical spring produces extension x. If the block is pulled and released, the periodic time of oscillation is

For circuit shown in figure I_E = 4 mA, I_B = 40 µA. What are the values of ex, and le respectively?

An ammeter having resistance R₀ is converted into an ammeter of range nI. The effective resistance of the instrument is ______

The density of a metal at normal pressure p is ρ. When it is subjected to an excess pressure, the density becomes ρ'. If K is the bulk modulus of the metal, then the ratio `(ρ"′")/ρ` is ____________.

Metal rings P and Q are lying in the same plane, where current I is increasing steadily. The induced current in metal rings is shown correctly in figure.

A body of mass 64 g is made to oscillate turn by turn on two different springs A and B. Spring A and B has force constant 4 `"N"/"m"` and `16 "N"/"m"` respectively. If T₁ and T₂ are period of m oscillations of springs A and B respectively, then `("T"_1 + "T"_2)/("T"_1 - "T"_2)` will be ______.

A vertical straight conductor carries a current vertically upwards. A point P lies to the east of it at a small distance and another point Q lies to the west at the same distance. The magnetic field at P is ______

A layer of atmosphere that reflects medium frequency radio waves which is ineffective during night, is ______.

A cylindrical bar magnet is kept along the axis of a circular coil. If the magnet is rotated about its axis, then ____________.

A voltmeter can measure upto 25 V and its resistance is 1000 `Omega`. How much resistance should be connected in series so that it can measure voltage upto 250 volt?

To increase the range of voltmeter the series resistance should be ____________.

The displacement of the particle executing linear S.H.M. is x = 0.25 Sill ( 11 l + 0.5) m. The period of S.H.M. is ______.

(`pi = 22/7` )

The ratio of frequencies of oscillations of two simple pendulums is 3: 4 then their lengths are in the ratio ______.

In amplitude modulation. the amplitude of carrier wave is A_c and that of the modulating signal is A_m· In practice, the ratio of A_m to A_c is kept less than or equal to one, to avoid ______.

Six very long insulated copper wires are bound together to form a cable. The currents carried by the wires are l₁ = + 10 A, l₂ = -13 A, l₃ = + 10 A, l₄ = + 7 A, l₅ = -12 A and l₆ = + 18 A. The magnetic induction at a perpendicular distance of 10 cm from the cable is ______.
(µ₀ = 4π x 10^-7 Wb/A-m)

The pointer reading v/s load graph for a spring balance is as given in the figure. The spring constant is ______.

The range of the voltmeter is 'V' when 50 n resistance is connected in series. Its range gets doubled when 500 Ω resistance is connected in series. The resistance of voltmeter is ______.