Electricity

SI unit of current is,

• coulombs

• volt

• joules

• ampere

 $\mu A$  and  $mA$  refer to following value

•  $10^{-3\ }\ and\ 10^{-6}$  

•  $10^{-6\ }\ and\ 10^{-9}$  

•  $10^{-6}\ and\ 10^{-3}$  

•  $10^{-3}\ and\ 10^{-9}$  

Work done in moving 10 C of charge across a potential difference of 5 V is,

• 50 J

• 2 J

• 0.5 J

• 25 J

You are given three resistance of 3 ohms each. If you connect them in "parallel" to each other then resultant resistance will be,

• 1 ohm

• 3 ohms

• 6 ohms

• 9 ohms

SI unit of resistivity is

• $\Omega m$

• $\frac{\Omega}{m}$

• $\frac{m}{\Omega}$

• $\Omega$

Resistivity of an wire depends on

• Length And temperature

• Area of cross-section and temperature

• Length and Area of cross section

• Only temperature

If length of an wire is halved and area of cross-section is doubled, then the "resistivity" of the material will be,

• Doubled

• Halved

• 1/4 of previous value

• No change as it does not depend on length or area of cross section

Direction of flow of electrons is from,

• Positive to Negative terminal

• Negative to Positive terminal

• Electrons do not move

One ampere is constituted by the flow of_____________ of charge per second

• one volt

• one watt

• one Joule

• one coulomb

Which of this is formula for Potential difference

• W/I

• Q/W

• W/It

• V/q