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  3. 2) a). the resistivity of a wire varies with its

2) a). The resistivity of a wire varies with its length area of cross-section mass material b) Given the units...

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Physics

2) a). The resistivity of a wire varies with its

  1. length
  2. area of cross-section
  3. mass
  4. material

b) Given the units of a physical quantity. Choose the correctrelation (J is for Joule, V is for volt, C is for Coulomb)

A) J = CV

B) J = VA

C) J = C/A

D) V = J C

c) A charge of 3 C moving in a uniform electric fieldexperiences a force 3000 N. The potential difference between twopoints situated in the field at a distance 1 cm from each otherwill be

A) 10 V

B) 90 V

C) 1000 V

D) 9000 V

d) Choose the only incorrect relation:

A) ampere = coulomb/second

B) volt = coulomb/joule

C) ohm = volt/ampere

D) coulomb = Joule/volt

e) In an astronomical telescope, the image formed by theobjective is I0  and that formed by eye piece isIe . Then

A)I0   andIe are both real

B)I0   andIe are both virtual

C)I0   is virtual andIe   is real

D)I0   is real andIe   is virtual

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