When X rays pass through a strong uniform magnetic field, Then they
|
(a) Do not get deflected at all |
|
(b) Get deflected in the direction of the field |
|
(c) Get deflected in the direction opposite to the field |
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(d) Get deflected in the direction perpendicular to the field |
(a) Do not get deflected at all
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Assertion : Moon is seen as it partly reflects the sun light falling on it
Reason : Moon is a satellite of earth. It does not emit light of its own
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
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(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
An electron beam in an X-ray tube is accelerated through a potential difference of 50000 volts. These are then made to fall on a tungsten target. The shortest wavelength of the X-ray emitted by the tube is
| (a) 2.5 Å | (b) 0.25 nm | (c) 0.25 cm | (d) 0.025 nm |
In an interference arrangement similar to Young's double slit experiment, the slits S1 and S2 are illuminated with coherent microwave sources each of frequency 106 Hz. The sources are synchronized to have zero phase difference. The slits are separated by distance d = 150 m. The intensity I (𝜃) is measured as a function of q, where q is defined as shown. If I0 is maximum intensity, then I(θ) for 0 ≤ θ ≤ 90° is given by
|
(a) I(θ) = |
(b) I(θ) = |
|
(c) I(θ) = |
(d) a, b |
A metallic loop is placed in a magnetic field. If a current is passed through it, then
|
(a) The ring will feel a force of attraction |
|
(b) The ring will feel a force of repulsion |
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(c) It will move to and fro about its centre of gravity |
|
(d) None of these |
Two concentric coplanar circular loops of radii 
and 
carry currents of respectively 
and 
in opposite directions (one clockwise and the other anticlockwise.) The magnetic induction at the centre of the loops is half that due to alone at the centre. If 
. the value of 
is
|
(a) 2 |
(b) 1/2 |
(c) 1/4 |
(d) 1 |
A solid reflects incident light and it’s electrical conductivity decreases with temperature. The binding in this solids
|
(a) Ionic |
(b) Covalent |
(c) Metallic |
(d) Molecular |
