General Science Class 10

Metals are good conductors of electricity because they have free :

1. Electrons
2. Protons
3. Neutrons
4. Photons

The continuous flow of electrons is made possible by a device called?

1. Cathode
2. Electron gun
3. Anode
4. Filament

The electric field can be detect :

1. Photon
2. Neutron
3. Proton
4. Electron

If the direction of magnetic field is reversed, the direction of force is :

1. Reversed
2. Not reversed
3. May or may not reversed
4. None of these

The process of emission of electrons from the hot metal surfaces is called?

1. Plastic emission
2. Thermionic emission
3. Static emission
4. Current emission

If input of a NOT gate is "1" then its output is :

1. 1
2. 0
3. May be 1 or may be 0
4. None of these

The Boolean expression of an AND gate is :

1. A . B
2. A + B
3. A x B
4. None of these

Electronics comprises the :

1. Physics
2. Engineering
3. Technology
4. All of these

The Boolean expression of an OR gate is :

1. A . B
2. A + B
3. A x B
4. None of these

The cathode ray carry :

1. Positive charge
2. Neutral
3. Negative charge
4. Positrons