10 Question-answer on resistance | Learn Physics

10 Question-answer on resistance

1.       The length of a conductor is halved, its conductivity will be:

(a)    Doubled

(b)   Halved

(c)    Quadrupled

(d)   Unchanged

Ans: (d)

2.       The length of a conductor is doubled. Its conductance will be:

(a)    Unchanged

(b)   Halved

(c)    Doubled

(d)   Quadrupled

Ans: ( b)

3.       The length and area of cross-section of a conductance are doubled its resistance is:

(a)    Unchanged

(b)   Halved

(c)    Doubled

(d)   Quadrupled

Ans: (a)

4.       The length of a conductor is doubled and its radius is halved, its specific resistance is

(a)    Unchanged

(b)   Halved

(c)    Doubled

(d)   Quadrupled

Ans: (a)

5.       The length of a conductor is doubled and its radius is halved, its resistance is:

(a)    Unchanged

(b)   Doubled

(c)    Quadrupled

(d)   Eight times its value

Ans: (d)

6.       Conductivity of a conductor depends upon

(a)    Length

(b)   Area of cross-section

(c)    Volume

(d)   temperature

7.       a square aluminum rod is 1 m long and 5 mn on edge. What must be the radius of another aluminum rod whose length  1 m and which has the same resistance as the previous rod.

(a)    5 mm

(b)   4.2 mm

(c)    2.8 mm

(d)   1.4 mm

Ans: ( c)

8.       A given piece of wire of length l cross-sectional area A, and resistance R is stretched uniformly to a wire of length 2l. the new resistance is:

(a)    R/2

(b)   R

(c)    2R

(d)   4R

Ans: ( d)

9.       The example of a non-ohmic resistance is:

(a)    Diode

(b)   Copper wire

(c)    Filament lamp

(d)   Carbon resistor

Ans: ( a)

10.   Which of the following has negative temperature coefficient of resistance?

(a)    Platinum

(b)   Tungsten

(c)    Carbon

(d)   Nichrome

Ans: (c)