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

A proton, a deuteron and an α-particle with same kinetic energy enter into a uniform magnetic field at right angle to magnetic field. The ratio of the radii of their respective circular paths is ______.

A solid metallic cube having a total surface area of 24 m² is uniformly heated. If its temperature is increased by 10°C, calculate the increase in the volume of the cube.

(Given: α = 5.0 × 10^-4°C^-1)

Newton's universal law of gravitation applies to ______.

If three equal masses m are placed at the three vertices of an equilateral triangle of side 1/m then what force acts on a particle of mass 2m placed at the centroid?

A stretched wire 60 cm long is vibrating with its fundamental frequency of 256 Hz. If the length of the wire is decreased to 15 cm and the tension remains the same. Then the fundamental freuqency of the vibration of the wire will be ______.

A glass flask is filled up to a mark with 50 cc of mercury at 18°C. If the flask and contents are heated to 38°C, how much mercury will be above the mark? (α for glass is 9 × 10^-6/°C and coefficient of real expansion of mercury is 180 × 10^-6/°C)

Two unknown resistances are connected in two gaps of a meter-bridge. The null point is obtained at 40 cm from left end. A 30 Ω resistance is connected in series with the smaller of the two resistances, the null point shifts by 20 cm to the right end. The value of smaller resistance Ω is ______.

In series LCR circuit R = 18 Ω and impedance is 33 Ω An rms voltage 220V is applied across the circuit. The ture power consumed in AC circuit is ______.

For a particle moving in vertical circle, the total energy at different positions along the path ______.

From Brewster's law, except for polished metallic surfaces, the polarising angle ______.

A clock with an iron pendulum keeps the correct time at 15°C. If the room temperature is 20°C, the error in seconds per day will be near ______.

(coefficient of linear expansion of iron is 1.2 × 10^-5/°C) 

Two gases A and B are at absolute temperatures of 360 K and 420 K, respectively. The ratio of the average kinetic energy of the molecules of gas B to that of gas A is ______.

The Young's modulus of brass and steel are respectively 1.0 × 10¹¹ Nm^-2 and 2.0 × 10¹¹ Nm^-2. A brass wire and a steel wire of the same length are extended by 1 mm each under the same force. If the radii of brass and steel wire are R_B and R_S respectively, then ______.

When the temperature of an ideal gas is increased from 27°C to 227°C, its speed is changed from 400 ms^-1 to v_s, and Then v_s is ______.

When a particle oscillates simple harmonically, its kinetic energy varies periodically. If frequency of the particle is n, then the frequency of the kinetic energy is ______.

A metal rod Y = 2 × 10¹² dyne cm^-2 of coefficient of linear expansion 1.6 × 10^-5 per °C has its temperature raised by 20°C. The linear compressive stress to prevent the expansion of the rod is ______.

A conductor lies along the Z-axis at −1.5 ≤ Z ≤ 1.5 m and carries a fixed current of 10.0 A in −a_z​ direction as (see figure). For a field B = 3.0 × 10⁻⁴`"e"^(−0.2"x")`a_y ​T, find the power required to move the conductor at constant speed to x = 2.0 m, y = 0 in 5 × 10⁻³ s. Assume parallel motion along the x-axis.

The extension in a wire obeying Hooke's law is x. The speed of sound in the stretched wire is v. If the extension in the wire is increased to 4x, then the speed of sound in a wire is

The interference pattern is obtained with two coherent light sources of intensity ratio n. In the interference pattern, the ratio `("I"_"max" - "I"_"min")/("I"_"max" + "I"_"min")` will be ______

An obstacle is moving towards the source with velocity v. The sound is reflected from the obstacle. If c is the speed of sound and A. is the wavelength, then the wavelength of the reflected wave λ_r is