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

Work done in stretching a wire through 1 mm is 2 J. What amount of work will be done for elongating another wire of same material, with half the length and double the radius of cross-section, by 1 mm?

A tube closed at one end and containing air produces fundamental note of frequency 256 Hz. If the tube is open at both ends, the fundamental frequency will be ____________.

An organ pipe has a fundamental frequency of 120 Hz. Its fourth overtone is 600 Hz. Find the type of the pipe.

An electron moving in a circular orbit of radius r makes n rotations per second. The magnetic field produced at the centre has magnitude ____________.

A system changes from the state (P₁, V₁) to (P₂, V₂) as shown in the figure. What is the work done by the system?

50 g of copper is heated to increase its temperature by 10° C. If the same quantity of heat is given to 5 g water, the rise in its temperature is [Specific heat of copper = 420 joule-kg^-1 °C^-1 , specific heat of water = 4200 joule-kg^-I °C^-1]

The difference between the apparent frequency of a source of sound as perceived by the observer during its approach and recession is 2% of the frequency of the source. If the speed of sound in air is 300 ms^-1, then the velocity of the source is ______.

Which of the following substances (A, B and C) has the highest specific beat?

Two uniform brass rods A and B of length land 2l and radii 2r and r respectively are heated to the same temperature. The ratio of the increase in the volume ofB to that of A is ____________.

An A.C. voltage of r.m.s. value 0.1 V is applied to an LCR series circuit in which L = 100 µH and C = 9 x 10^-8 F and R = 2 `Omega`. The resonant frequency will be ____________.

Which of the following cannot determine the state of a thermodynamic system?

If length of a closed organ pipe is 60 cm and velocity of sound is 360 m/s, then the frequency of 1^st overtone is ____________.

A length L of wire carries a steady current I. It is bent first to form a circular plane coil of one turn. The same length is now bent more sharply to give a double loop of smaller radius. The magnetic field at the centre caused by the same current is ______.

A simple pendulum has a time period T₁ when on the earth's surface and T₂ when taken to a height R above the earth's surface, where R is the radius of the earth. The value of T₂ / T₁ is ______.

Two concentric circular coils of six turns each are situated in the same plane. Their radii are 10 cm and 20 cm and they carry respectively 0.1 A and 0.2 A current in same direction. The magnetic field in tesla at the centre is ______.

Two pendulums begin to swing simultaneously. The first pendulum makes nine full oscillations when the other makes seven. The ratio of the lengths of the two pendulums is ______.

If the potential difference across the inductor (9 mH) is same as that across the condenser (10 µF) in a series R-L-C circuit, then the frequency of the applied e.m.f. is nearly ____________.

Two cars moving in opposite directions approach each other with speed of 22 m/s and 16.5 m/s respectively. The driver of the first car blows a horn having a frequency 400 Hz. The frequency heard by the driver of the second car is [velocity of sound 340 m/s]: ____________.

Two light balls are suspended as shown in figure. When a stream of air passes through the space between them, the distance between the balls will ______.

In the given electrical circuit, which one of the following equations is a correct equation?