- AUndergoes acceleration all the time.
- BSpeeds up between the dees because of the magnetic field.
- CSpeeds up in a dees.
- DSlows down within a dee and speeds up between dees.
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A steady current of 5 amps is maintained for 45 mins. During this time it deposits 4.572 gms of zinc at the cathode of a voltameter. E.C.E. of zinc is
|
(a) 3.387 |
(b) 3.387 |
|
(c) 3.384 |
(d) 3.394 |
A certain charge liberates 0.8 gm of . The same charge will liberate how many gm of silver
|
(a) 108 gm |
(b) 10.8 gm |
(c) 0.8 gm |
(d) |
Ultraviolet light of wavelength 300 nm and intensity 1.0 watt/m2 falls on the surface of a photosensitive material. If 1% of the incident photons produce photoelectrons, then the number of photoelectrons emitted from an area of 1.0 cm2 of the surface is nearly
|
(a) 9.61 |
(b) 4.12 |
|
(c) 1.51 |
(d) 2.13 |
The lines of forces due to earth's horizontal component of magnetic field are
| (a) Parallel straight lines | (b) Concentric circles |
| (c) Elliptical | (d) Parabolic |
The sun radiates energy in all directions. The average radiations received on the earth surface from the sun is
.The average earth- sun distance is 1.5
. The mass lost by the sun per day is (1 day = 86400 seconds)
|
(a) 4.4 |
(b) 7.6 |
(c) 3.8 |
(d) 3.8 |