Electric Charges

The no of electrons present in 1C :

• 0.625X 10¹⁸

• 6.25 X 10¹⁸

• 62.5 X 10¹⁸

• 625 x 10¹⁸

What subatomic particles would you find in the nucleus of an atom?

• Protons only

• Protons and Neutrons

• Neutrons and Electrons

• Protons and Electrons

If a substance has a higher number of electrons than protons on its surface, what type of charge does it have?

• A positive charge.

• A neutral charge

• A negative charge

• No charge at all

The charge carried by 12.5 X  10^8  electrons :

•  2 X 10^-10 C    

• 2.5 X 10^-10 C     

• 0.25 X 10^-10 C   

• 0.2 X 10^-10 C

The Total Charge on an alpha particle is :___

• -3.2 X 10^-19C

• +3.2 X 10^-19C

• 32.0 X 10^-19C

• -32 X 10^-19 C

A billion electrons are added to a body, its charge becomes :

• 1.6 X 10^-19 C

• 1.6 X 10^-18 C

• -1.6 X 10^-10 C

• -1.6 X 10^-28 C

when 10¹⁴ electrons are removed from a neutral metal sphere, the charge on the sphere becomes:

• 16 X 10^-6 C

• -16X 10^-6 C

• 32 10^-6 C

• -32X 10^-6 C

A soap bubble is given a negative charge then

its radius :(a)

• Decreases

• increases

• remains un-changed

• insufficient information.

A polythene piece rubbed with wool is found to have a negative charge of 3.2 × 10^–7 C. The number of electrons transferred :_________

• 1.875 X 10¹³

• 1.875 X 10¹¹

• 18.75 X 10¹²

• 1.875 X 10¹²

A polythene piece rubbed with wool is found to have a negative charge. Is there a transfer of mass from wool to polythene?

• No

• Yes

• In-sufficient information

• none of the above