Question

Choose the correct answer:

1) Which of the following is a magnetic material?

a) gold b) steel c) silver d) cobalt


2) SI unit of frequency is:

a) meter b)hertz c) second d) none of these


3) These particles in an atom are electrically neutral:

a) neutrons b) protons c) electrons d) nucleus


4) The minimum time required to hear an echo is:

a) 1s b) 1.1 s c) 0.2 s d) 0.1 s


5) SI unit of electrical charge is
a) joule b)coulomb c) second d) ampere​

Answer 1

Answer:

1) Steel

2)hertz

3)nuetron

4)0.1sec

5)coulumb

Answer 2

Answer:

1) Cobalt

2) Hertz

3) Protons and Electrons

Thus, if an atom contains equal number of Protons and Electrons, the atom is described as being electrically neutral.

4) 0.1 s

5) Coulomb

Explanation:

Hope it helps you...