During an isothermal expansion, a confined ideal gas does - 150 J of work against its surroundings. This implies that
300 J of heat has been added to the gas
no heat is transferred because the process is isothermal
150 J of heat has been added to the gas
150 J of heat has been added to the gas
A parallel plate condenser has a uniform electric field E (V/m) in the space between the plates. If the distance between the plates is d(m) and area of each plate is A(m2) the energy (joule) stored in the condenser is
If power dissipated in the 9Ω resistor in the circuit shown is 36 W, the potential difference across the 2Ω resistor is
8 V
10 V
2 V
2 V
A current 2 A flows through a 2 Ω resistor when connected across a battery. The same battery supplies a current of 0.5 A when connected across a 9 Ω resistor. The internal resistance of the battery is
1/3 Ω
1/4 Ω
1 Ω
1 Ω
The electric and the magnetic field, associated with an electromagnetic wave, propagating along the +z - axis, can be represented by
A charge Q is enclosed by a Gaussian spherical surface of radius R. If the radius is doubled, then the outward electric flux will
be reduced to half
remain the same
be doubled
be doubled
The rate of increase of thermo - emf with temperature at the neutral temperature of a thermocouple
is zero
depends upon the choice of the two materials of the thermocouple
is negtive
is negtive
There are four light -weight rod samples A, B, C D separately suspended by threads. A bar magnet is slowly brought near each sample and the following observations are noted
(i) A is feebly repelled
(ii) B is feebly attracted
(iii) C is strongly attracted
(iv) D remains unaffected
C is a diamagnetic material
D is of a ferromagnetic material
A is of a non- magnetic material
A is of a non- magnetic material
In an AC circuit, an alternating voltage 100t volt is connected to a capacitor of capacity 1μF. The rms value of the current in the circuit is
100 mA
200 mA
20 mA
20 mA
Four electric charge +q, +q, -q and -q are placed at the corners of a square of side 2L (see figure). The electric potential at point A, mid-way between the two charges + q and +q, is
zero
zero
B.