Ultrasonic waves are those waves which _______.

The equation of a wave is y = 4 sin \(\left\{ \frac { \pi }{ 2 } \left( 2t+\frac { x }{ 8 } \right) \right\} \)where y, x are in em and t in seconds. The amplitude wavelength, velocity and frequency of the wave are, respectively _________.

Which one of the following equations of motion represents simple harmonic motion?

A body is executing simple harmonic motion with an angular frequency 2 rod/sec. The velocity of the body at 20mm displacement, when the amplitude of motion is 60mm, is _____________.

The equation of SHM of a particle is \(\frac{d^2y}{dt^2}+ky=0\), where k is a positive constant. The time period of motion is given by _________.

A loaded spring vibrates with a period T. The spring is divided into four equal parts and the same load is suspended from one as these parts. The new time period is _______

At absolute zero temperature, the K.E. of the molecules becomes ________

A jar has mixture of hydrogen and Oxygen gases in the ratio 1: 5. The ratio of mean kinetic energies of hydrogen and Oxygen molecules is ________.

An ideal gas heat engine operators in a carnot's cycle between 227°C and 127°C. It absorbs 6 x 10⁴J at high temperature. The amount of heat converted into work is ________.

An ideal gas is expanding such that PT2 = constant the coefficient of volume expansion of the gas is _____________.

Which of the following will make the volume of an ideal gas four times?

If the surface tension of water is 0.06 Nm^-1, then the capillary rise in a tube of diameter 1 mm is (angle of contact = 0°) _________.

A gale blows over a house. The force due to the gale on the roof is ________.

When a fluid passes through the constricted part of a pipe, its _________.

If the tension on a wire is removed at once, then _______.

In an adiabatic system which is true?

Two fluids 1 and 2 have mass densities of P₁ and P₂ respectively. If P₁> P₂, which one of the following expressions will represent the relation between their specific volumes V₁ and V₂?

A body is suspended from a spring balance kept in a satellite the reading of the balance is W₁ when the satellite goes in an orbit of radius R and is W₂ when it goes in an orbit of radius 2R

The fractional change in wavelength of light coming from a star is 0.014%. What is its velocity?

The average K.E of a molecule __________.

The displacement y of a wave travelling in the x-direction is given by y = 10^-4 sin (600t - 2x + \(\pi\sqrt{3}\)) Where is expressed in metres t is seconds, the speed of the wave motion(in ms^-1) is _________________.

Consider two uniform wires vibrating simultaneously in their fundamental notes. The tensions, densities, lengths and diameter of the two wires are in the ratio 8 : 1, 1 : 2, x : y and 4 : 1 respectively. If the note of the higher pitch has a frequency of 360 Hz and the number of beats produced per second is 10, then the value of x : y is

Two identically sized rooms A and B are connected by an open door. If the room A is air conditioned such that its temperature is 4°C lesser than room B, which room has more air in it?

Copper of fixed volume V is drawn into a wire of length l. When this wire is subjected to a constant force F, the extension produced in the wire is Δl. If Y represents the Young’s modulus, then which of the following graphs is a straight line?

A planet moving along an elliptical orbit is closest to the Sun at distance r₁ and farthest away at a distance of r₂. If v₁ and v₂ are linear speeds at these points respectively. Then the ratio \({v_1\over v_2}\) is