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

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 ____________.

A parallel beam of light is incident normally on a perfectly absorbing surface. If the force exerted by the light beam on the surface is 2 x 10^-7 N in 10 nanoseconds, the energy of photons hitting the surface is ____________.

A railway engine whistling at a constant frequency moves with a constant speed aixi it goes past a stationary observer standing beside the railway track. Then the frequency of (n') of the sound heard by the observer with respect to time (t) can be best represented by which of the following curve?

A pipe open at both ends and a pipe closed at one end have same length. The ratio of frequencies of their p^th overtone is ______.

lf the current flowing in a circular loop is in clockwise direction, then the magnetic induction will be ____________.

The fundamental frequency of sonometer wire increases by 9 Hz, if its tension is increased by 69%, keeping the length constant. The frequency of the wire is ______.

At what frequency (approximate) will the inductive reactance of 4 H inductance be equal to the capacitive reactance of 4 µF capacitance?

The number of photons falling per second on a completely darkened plate to produce a force of 6.62 x 10^-5 N is 'n'. If the wavelength of the light falling is 5 x 10^-7 m, then n = ____________ x 10²². (h = 6.62 x 10^-34 J-s)

The magnetic induction at the centre of a coil made from a wire of length 44 m carrying a current of 0.5 A is nearly ____________.

A wire of length L carrying a current I is bent into a circle. The magnitude of the magnetic field at the centre of the circle is ____________.

Surface tension of a liquid is numerically equal to ______.

A source of sound is moving with constant velocity of 30 mis emitting a note of frequency 256 Hz. The ratio of frequencies observed by a stationary observer while the source is approaching him and after it crosses him is ______. (speed of sound in air = 330 m/s)

A bus is moving with a velocity of 5 m is towards a wall. The driver blows the horn of frequency 165 Hz. If the speed of sound in air is 335 m is, then after reflection of sound wave, the number of beats per second heard by the passengers in the bus will be ______.