Instructions:

The sound wave produced in a gas is always

Water waves are

A wave y = Asin(\omega t – kx) has the pressure amplitude if density of air is \rho

In a travelling wave y = 0.1sin\pi(x-330t+\frac{2}{3}). The phase difference between X_1 = 3m and X_2 = 3.5m will be

The propagation constant of a wave is also called its

The velocity of sound in air is not affected by change in

With decrease in water vapor contents in air, velocity of sound

The change in temperature affect to the following parameter of sound is

Speed of sound in Helium is ‘U’. The speed of sound in humid helium at the same temperature will be

The speed of sound in Hydrogen is 11 at STP. Then in Helium is

The shortest length of closed pipe which resonate with a frequency ‘n’ is, if velocity of sound is V

A closed pipe is excited to support the third overtone, it is found that air in the pipe has

In the third normal mode of vibration of closed organ pipe, the number of nodes and antinodes respectively are

The reciprocal of resistance is

A metallic wire of resistance 40 \Omega is stretched to twice its length. Its new resistance would be approximately:

The current in a coil of resistance 90 ohms is to be reduced by 90 percent. What value of resistance should be connected in parallel with it?

Which of the following is the unit of resistance?

Which of the following materials is the most suitable for making a permanent magnet?

What happens to the magnetic needle kept in a non-uniform magnetic field?

What is the torque acting on the bar magnet of moment M which is placed in a uniform field H making an angle of 30^o with the field?

Which of the following statements is true about magnetic lines of force?

Magnetic lines of force of a bar magnet do not intersect because

Which of the following is the significance of Millikan’s oil drop experiment?

An electron and a proton enters into same electric field perpendicular to the direction of field. Which one get more deflection due to field?

An electron having energy 800 eV moves at right angles to the uniform magnetic field of 2.6\times 10^{-3} T. What is the radius of path followed by electron?

A beam of electrons moving with velocity of 5\times 10^6 m/s passes between two parallel plates 1cm apart. A magnetic field of 0.05T is applied to keep electrons undeflected. What is the p.d. between plates?

An electron moving with a speed of 2.5\times 10^7 m/s is deflected by an electric field of 1600V/m perpendicular to its path. If the radius of the electron trajectory is 2.3m, calculate e/m for the electron.

When the beam of electrons is passed between the pates having an electric field, the beam deflects towards

If the speed of sound at 0^oC is v_o, the velocity at 273^oC will be

The Laplace correction was necessary to Newton’s calculation of velocity of sound, because propagation of sound in a medium is