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

A metal rod of length Land cross-sectional area A is heated through T °C. What is the force required to prevent the expansion of the rod lengthwise?

(Y = Young's modulus of material of the rod, α = coefficient of linear expansion of the rod.)

The average translational kinetic energy of a molecule in a gas is 'E₁'. The kinetic energy of the electron (e) accelerated from rest through p.d. 'V' volt is 'E₂'. The temperature at which E₁ = E₂ is possible, is ______.

The volume of a metal block changes by 0.86% when heated through 200 °C then its coefficient of cubical expansion is ______.

The Q-value of a nuclear reaction and kinetic energy of the projectile particle, K_P are related as ______.

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 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)

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

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 ______.

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

A block of mass m is moving on rough horizontal surface with momentum p. The coefficient of friction between the block and surface is µ. The distance covered by the block before it stops is [g =acceleration due to gravity)