- ACast iron.
- BSteel.
- CSoft iron.
- DStainless steel.
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In an X-ray tube electrons bombarding the target produce X-rays of minimum wavelength 1 Å. What must be the energy of bombarding electrons
|
(a) 13375 eV |
(b) 12375 eV |
(c) 14375 eV |
(d) 15375 eV |
Given three equal resistors, how many different combination of all the three resistors can be made
|
(a) Six |
(b) Five |
(c) Four |
(d) Three |
In Bohr’s model, if the atomic radius of the first orbit is
, then the radius of the fourth orbit is
|
(a) |
(b) 4 |
(c) |
(d) 16 |
In extrinsic semiconductors
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(a) The conduction band and valence band overlap |
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(b) The gap between conduction band and valence band is more than 16 eV |
|
(c) The gap between conduction band and valence band is near about 1 eV |
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(d) The gap between conduction band and valence band will be 100 eV and more |
The potentials of the two plates of capacitor are +10V and –10 V. The charge on one of the plates is 40 C. The capacitance of the capacitor is
|
(a) 2 F |
(b) 4 F |
(c) 0.5 F |
(d) 0.25 F |
Which one of the following statements is true
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(a) An object situated at the principle focus of a concave lens will have its image formed at infinity |
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(b) Concave mirror can give diminished virtual image |
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(c) Given a point source of light, a convex mirror can produce a parallel beam of light |
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(d) The virtual image formed in a plane mirror can be photographed |
The band gap in Germanium and silicon in eV respectively is
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(a) 0.7, 1.1 |
(b) 1.1, 0.7 |
(c) 1.1, 0 |
(d) 0, 1.1 |