MCQ
A shortsighted person uses for clear vision :
- Aconvex lens
- ✓concave lens
- Ccylindrical lens
- Dbifocal length
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The work function of a metal is
|
(a) The energy for the electron to enter into the metal |
|
(b) The energy for producing X-ray |
|
(c) The energy for the electron to come out from metal surface |
|
(d) None of these |
X-rays can be used to study crystal structure, if the wavelength lies in the range
| (a) 2 Å to 0.1 Å | (b) 10 Å to 5 Å | (c) 50 Å to 10 Å | (d) 100 Å to 50 Å |
Lamps used for household lighting are connected in
|
(a) Series |
(b) Parallel |
(c) Mixed circuit |
(d) None of the above |
The electromagnetic waves do not transport
| (a) Energy | (b) Charge | (c) Momentum | (d) Information |