Physics Test 18...

Helium gas goes through a cycle ABCDA (consisting of two isochoric and isobaric lines) as shown in figure. Efficiency of this cycle is nearly (Assume the gas to be close to ideal gas)

If the potential energy of a gas molecule is  M and N being positive constants. Then the potential energy at equilibrium must be

A block connected to a spring oscillates vertically. A damping force Fd, acts on the block by the surrounding medium. Given as  b is a positive constant which depends on :

The fundamental frequency of a closed organ pipe of length 20 cm is equal to the second overtone of an organ pipe open at both the ends. The length of organ pipe open at both the ends is

A parallel plate air capacitor is charged to a potential difference of V volts. After disconnecting the charging battery, the distance between the plates of the capacitor is increased using an insulating handle. As a result, the potential difference between the plates

A car battery has e.m.f. 12 volt and internal resistance  ohm. If it draws 60 amp current, the terminal voltage of the battery will be

When a long wire carrying a steady current is bent into a circular coil of one turn, the magnetic induction at its centre is B. When the same wire carrying the same current is bent to form a circular coil of n turns of a smaller radius, the magnetic induction at the centre will be

A magnet is moved towards a coil (i) quickly (ii) slowly, then the induced e.m.f. is