In a diffraction pattern by a wire, on increasing diameter of wire, fringe width
|
(a) Decreases |
|
(b) Increases |
|
(c) Remains unchanged |
|
(d) Increasing or decreasing will depend on wavelength |
(a) Decreases
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The band spectra (characteristic of molecular species) is due to emission of radiation
|
(a) Gaseous state |
(b) Liquid state |
(c) Solid state |
(d) All of three states |
A uniform conducting wire ABC has a mass of 10g. A current of 2A flows through it. The wire is kept in a uniform magnetic field B = 2T. The acceleration of the wire will be
| (a) Zero |
(b) 12  along y-axis
|
(c) 1.2  along y-axis
|
(d) 0.6 along y - axis
|
In a step-up transformer the voltage in the primary is 220 V and the current is 5A. The secondary voltage is found to be 22000V. The current in the secondary (neglect losses) is
|
(a) 5 A |
(b) 50 A |
(c) 500 A |
(d) 0.05 A |
A 100 turns coil shown in figure carries a current of 2 amp in a magnetic field 
. The torque acting on the coil is
|
(a) 0.32 Nm tending to rotate the side AD out of the page |
|
(b) 0.32 Nm tending to rotate the side AD into the page |
|
(c) 0.0032 Nm tending to rotate the side AD out of the page |
|
(d) 0.0032 Nm tending to rotate the side AD into the page |
Assertion : 29 is the equivalent decimal number of binary number 11101.
Reason : (11101)2 = (1 × 24 + 1 × 23 + 1 × 22 + 0 × 21 + 1 × 20 )10 = (16 + 8 + 4 + 0 + 1)10 = (29)10
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
Gases begin to conduct electricity at low pressure because
|
(a) At low pressure, gases turn to plasma |
|
(b) Colliding electrons can acquire higher kinetic energy due to increased mean free path leading to ionisation of atoms |
|
(c) Atoms break up into electrons and protons |
|
(d) The electrons in atoms can move freely at low pressure |
The energy levels of the hydrogen spectrum is shown in figure. There are some transitions A, B, C, D and E. Transition A, B and C respectively represent
|
(a) First member of Lyman series, third spectral line of Balmer series and the second spectral line of Paschen series |
|
(b) Ionization potential of hydrogen, second spectral line of Balmer series and third spectral line of Paschen series |
|
(c) Series limit of Lyman series, third spectral line of Balmer series and second spectral line of Paschen series |
|
(d) Series limit of Lyman series, second spectral line of Balmer series and third spectral line of Paschen series |
Two identical thin bar magnets each of length l and pole strength m are placed at right angle to each other with north pole of one touching south pole of the other. Magnetic moment of the system is
|
(a) ml |
(b) 2ml |
(c) |
(d) |
