HSC Science Class 12 - Tamil Nadu Board of Secondary Education Question Bank Solutions

UV light of wavelength 1800 Å is incident on a lithium surface whose threshold wavelength is 4965 Å. Determine the maximum energy of the electron emitted.

Doping a semiconductor result in

Why is temperature co-efficient of resistance negative for semiconductor?

What do you mean by doping?

Distinguish between intrinsic and extrinsic semiconductors.

Why can’t we interchange the emitter and collector even though they are made up of the same type of semiconductor material?

Elucidate the formation of n-type extrinsic semiconductors.

The particle size of ZnO material is 30 nm. Based on the dimension it is classified as

Which one of the following is the natural nanomaterial.

The blue print for making ultra-durable synthetic material is mimicked from ____________.

The method of making nanomaterial by assembling the atoms is called ____________.

“Ski wax” is an application of nano product in the field of ____________.

The particle which gives mass to protons and neutrons are ____________.

Distinguish between Nanoscience and Nanotechnology.

What is the difference between Nano materials and Bulk materials?

Give any two examples for “Nano” in nature.

What are black holes?

What are subatomic particles?

Discuss the applications of Nanomaterials in various fields.

What are the possible harmful effects of the usage of Nanoparticles? Why?