Indian army has published the notification for SSC Tech 56 men and SSC Tech 27 women for the course commencing at OTA Chennai from April 2021
When a photon hits a piece of silicon, one of three things can happen:
1) The photon can pass straight through the silicon — this (generally) happens for lower energy photons.
2) The photon can reflect off the surface.
3) The photon can be absorbed by the silicon if the photon energy is higher than the silicon band gap value. This generates an electron-hole pair and sometimes heat depending on the band structure.
Which of the statements given above is/are correct?
1 and 3 only
2 and 3 only
3 only
1,2 and 3
Match the followings:
List - I
A) Electric conductance
B) Magnetic flux
C) Capacitance
D) Amount of heat
List -II
1) Joule
2) Siemens
3) Weber
4) Farad
A - B - C - D
A1 B4 C3 D2
A2B3C4D1
A1 B3 C4 D2
A2 B1 C3 D4
Jarrah and barri types of wood is used in?
as fuel
making showpiece
railway sleepers
pencil
________ is an alloy of mercury.
Duralumin
Bronze
Amalgam
Steel
Choose the incorrect statements from the following:
A metal used in joining electric wires - Magnesium
A metal which becomes passive if dipped in nitric acid- Aluminium
A metal unreactive towards oxygen and dilute acids - Gold
A metal never found in the free state in nature- Calcium
