**Q1. If the length and area of cross-section of a wire are doubled, then its resistance**

A. becomes four times

B. becomes sixteen times

**C. remains the same**

D. becomes two times

**Q2. A length of wire has a resistance of 10 ohms. What is the resistance of a wire of the same material three times as long and twice the cross-sectional area?**

A. 30 ohms

B. 20 ohms

**C. 15 ohms**

D. 7 ohms

**Q3. What is the SI unit of specific resistance or resistivity?**

A. Ohm-circular mil per inch

B. Ohm-circular mil per foot

**C. Ohm-m**

D. Ohm-cm

**Q4. The resistivity of a conductor with an increase in temperature. **

**A. increases**

B. decreases

C. remains the same

D. becomes zero

**Q5. What is the SI unit of conductance? **

**A. Siemens**

B. Mhos

C. Ohms

D. 1/Ohms

**Q6. If the resistance of a material 2 m long and 2 m^2 in area of cross-section is 1.6 ×10^-8 fi, then its resistivity is**

A. 3.2 × 10^-8 fi-m

**B. 1.6 × 10^-8 fi-m **

C. 0.64 × 10^-8 fi-m

D. 0.16 × 10^-8 fi-m

**Q7. What is the SI unit of conductivity?**

A. Ohms/m

B. Ohms-m

C. Siemens-m

**D. Siemens/m**

**Q8. The temperature coefficient of resistance of conductors is **

**A. positive**

B. zero

C. negative

D. infinite

**Q9. The temperature coefficient of resistance of semiconductors is**

A. positive

B. zero

C. negative

**D. infinite**

**Q10. What determines the value of the temperature coefficient of resistance of a material?**

A. length

B.cross-sectional area

**C.volume**

D.nature and temperature