Electrons

Q. Non metals gain electrons and become negatively charged ions. What is the reason for such an occurance?

1. Extra electrons make the atom heavy.
2. On gaining electrons, the element loses protons.
3. Electrons are negatively charged particles.
4. Such an occurance does not happen.

Q.

Why is the Earth called 'the ocean of charges'?

1. It can absorb a stream of both positive as well as negative charges.

2. It cannot absorb a stream of either positive or negative charges.

3. It can absorb a stream of positive charges.

4. It can absorb a stream of negative charges.

Q.

The potential difference in an X -ray tube is 5 kV and the current through it is 3.2 mA. Then the number of the electrons striking the target per second is

1. $2\times {10}^{16}$
   

2. $5\times {10}^{16}$
   

3. $1\times {10}^{16}$
   

4. $4\times {10}^{16}$

Q. In an electric circuit, the current flows from the:

(A) negative terminal to the positive terminal
(B) negative terminal to the neutral terminal
(C) positive terminal to the negative terminal
(D) neutral terminal to the positive terminal [1 Mark]

Q.

An ion has a charge whereas an atom does not. So what can an ion do that an atom can't. And also how does the ion do that ?

Q.

According to the conventions direction of flow of electric current is taken from positive terminal to negative terminal of the battery, which is opposite to the flow of___ .

Q.

What are free electrons?

Q.

Why is the Earth called 'the ocean of charges'?

1. It can absorb a stream of positive charges

2. It cannot absorb a stream of either positive or negative charges

3. It can absorb a stream of both positive as well as negative charges

4. It can absorb a stream of negative charges

Q. maam how many unshared electron pairs are there in no2?? do we have to count an odd electron as a pair?

Q. Non metals gain electrons and become negatively charged ions. What is the reason for such an occurance?

1. Extra electrons make the atom heavy.
2. On gaining electrons, the element loses protons.
3. Electrons are negatively charged particles.
4. Such an occurance does not happen.

Q.

The flow of which of the following fundamental particles leads to the existence of electricity?

1. Protons

2. Atoms

3. Electrons

4. Nuclei

Q.

1.True or False

a)nucleus of an atom contains protons and electrons.

b)loss of electron in an atom gives rise to negatively charged ion.

c)gain of electron in an atom gives rise to negatively charged ion.

d)neutron has a positive charge.