- ✓attract each other
- Brepel each other
- Cnot exert any force on each other
- Dcurrent in one of the wire vanishes
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In X-ray tube when the accelerating voltage V is halved, the difference between the wavelength of Ka line and minimum wavelength of continuous X-ray spectrum
|
(a) Remains constant |
(b) Becomes more than two times |
|
(c) Becomes half |
(d) Becomes less than two times |
In a junction diode, the holes are due to
| (a) Protons | (b) Neutrons | (c) Extra electrons | (d) Missing of electrons |
In the circuit shown, the value of each resistance is r, then equivalent resistance of circuit between points A and B will be
|
(a) (4/3) r |
(b) 3r / 2 |
(c) r / 3 |
(d) 8r/7 |
Which of the following is accompanied by the characteristic X-ray emission
| (a) α - particle emission | (b) Electron emission |
| (c) Positron emission | (d) K–electron capture |
A bar magnet of magnetic moment 200 A-m2 is suspended in a magnetic field of intensity 0.25 N/A-m. The couple required to deflect it through 30o is
|
(a) 50 N-m |
(b) 25 N-m |
(c) 20 N-m |
(d) 15 N-m |
A signal emitted by an antenna from a certain point can be received at another point of the surface in the form of
|
(a) Sky wave |
(b) Ground wave |
(c) Sea wave |
(d) Both (a) and (b) |