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

A 100 mH coil carries a current of 4 ampere. The energy stored in joules is ____________.

A transistor-oscillator using a resonant circuit with an inductor L (of negligible resistance) and a capacitor C in series produce oscillation of frequency f. If L is doubled and C is changed to 4C, the frequency will be ____________.

A thin wire of 99 cm is fixed at both ends as shown in figure. The wire is kept under a tension and is divided into three segments of lengths l₁, l₂, and l₃ as shown in figure. When the wire is made to vibrate respectively with their fundamental frequencies in the ratio 1:2:3. Then the lengths l₁, l₂, and l₃ of the segments respectively are (in cm).

Two moles of an ideal monoatomic gas are taken around a cycle ABCA as shown in the figure. The work done during the cycle is ______.

The ratio of the magnetic field at the centre of a current-carrying circular wire and the magnetic field at the centre of a semi-circular coil made from the same length of wire will be ______.

Two strings A and B of same material are stretched by same tension. The radius of the string A is double the radius of string B. Transverse wave travels on string A with speed 'V_A' and on string B with speed 'V_B'. The ratio `"V"_"A"/"V"_"B"` is ______.

A circular coil 'A' has a radius 'R' and the current flowing through it is I. Another circular coil 'B' has radius 4R and current flowing through it is 4I. The magnetic field at the centre of the circular coil is in the ratio of ______.

Which of the substances P, Q, or R has the lowest specific heat? The temperature v/s time graph is shown ______.

In parallel resonance, the current will be minimum, when ____________.

The period of simple pendulum is measured as T in a stationary lift. If the lift moves upward with an acceleration of 5 g, the period will ____________.

A uniform rope of mass 6 kg hangs vertically from a rigid support. A block of mass 2 kg is attached to the free end of the rope. A transverse pulse of wavelength 0.06 m is produced at the lower end of the rope. The wavelength of the pulse, when it reaches the top is ______. (in m) 

An air column, closed at one end and open at the other resonates with a tuning fork of frequency v, when its length is 45 cm, 99 cm and at two other lengths in between these values. The wavelength of sound in air column is ____________.

The diagram shows the path of four `alpha` - particles of the same energy being scattered by the nucleus of an atom simultaneously. Which of these are/is not physically possible?

An open organ pipe produces its fundamental frequency f. When the pipe is dipped in water so that `2/5` of its length is under water, then its 5 fundamental frequency becomes ____________.

When the pressure on the gas is increased to 4 times that of initial value, volume becomes `1/3`rd that of initial. Percentage difference in temperature will be ______.

In a resonance tube, first and second resonance positions occur respectively at 28 cm and 88 cm. If the frequency of the fork is 300 Hz, then the speed of sound is ____________.

In LCR circuit, the capacitance is changed from C to 4C. For some resonant frequency, the inductance should be changed from L to ____________.

A pipe closed at one end produces a fundamental note of 412 Hz. It is cut into two pieces of equal length. The fundamental notes produced by the two pieces are ____________

An open pipe of certain length produces fundamental frequency f₁. A closed pipe of some other length produces fundamental .frequency f₂. When the two are joined to form a longer close tube, its fundamental frequency will be ____________.

If a pendulum which gives correct time beats second on ground at a certain place is moved to the top of a tower 320 m high, then the loss of time of the pendulum clock in one day, in second, is ______.