11.

A mass of diatomic gas  at a pressure of 2 atm is compressed adiabatically so that its temperature rise from 27^oC to 927^o C. The pressure of the gas is final state is 

• 28 atm

• 68.7 atm

• 256 atm

• 256 atm

Two particle are oscillating along two close parallel straight lines sides by sides, with the same frequency and amplitudes. They pass each other, moving in opposite directions when their displacement is half of the amplitude. The mean position of the two particles lie on a straight line perpendicular to the paths of the two particles.
The phase difference is

• zero

• 2π/3

• π

• π

A galvanometer of resistance, G is shunted by a resistance S ohm. To keep the main current in the circuit unchanged,the resistance to be put in series with the galvanometer is

A square loop, carrying a steady current I, is placed in a horizontal plane near a long straight conductor carrying a steady current I₁ at a distance d from the conductor as shown in the figure. The loop will experience

• a net repulsive force away from the conductor

• a net torque acting upward perpendicular to the horizontal plane

• a net torque acting downward normal to the horizontal plane

• a net torque acting downward normal to the horizontal plane

A thermocouple force towards the conductor produces an emf of 40 μ V/^oC in the linear range of temperature. A galvanometer of resistance 10 Ω whose sensitivity is 1μA/div, is employed with the thermocouple. The smallest value of temperature difference that can be detected by the system will be.

• 0.5^oC

• 1^oC

• 0.1^oC

• 0.1^oC

The rms value of potential difference V shown in the figure is 

• V_o

• 

• V_o/2

• V_o/2

Charge q is uniformly spread on a thin ring of radius R. The ring rotates about its axis with a uniform frequency f Hz. The magnitude of magnetic induction at the centre of the ring is 

• μ_oqf  / 2R

• μ_oq / 2fR

• μ_oq / 2πfR

• μ_oq / 2πfR

The electric potential V at any point (x, y,z), all in meters in space is given by V= 4x² volt. The electric field at the point (1,0,2) in volt/meter is 

• 8 along positive X-axis

• 16 along negative x- axis

• 16 along positive X- axis

• 16 along positive X- axis

A short bar magnet of magnetic moment 0.4 JT^-1 is placed in a uniform magnetic field of 0.16T. The magnet is stable equilibrium when the potential energy is

• -0.64 J

• zero

• -0.082 J

• -0.082 J

In the circuit shown in the figure, if potential at point A is taken to be zero,the potential at point B is

• -1V

• +2 V

• -2 V

• -2 V