Physics

1. Electric current is the flow of:

• A) Protons

• B) Neutrons

• C) Electrons

• D) Atoms

2. The SI unit of electric current is:

• A) Volt

• B) Ampere

• C) Ohm

• D)Coulomb

3. 1 Ampere is equal to:

• A) 1 C/s

• B) 1 J/s

• C) 1 V/s

• D) 1 W/s

4. Ohm's law is given by:

• A) V = IR

• B) I = VR

• C) R = IV

• D) V = I/R

5. If a current of 2A flows through a wire for 5 seconds, the charge passed is:

• A) 2 C

• B) 5 C

• C) 10 C

• D) 0.4 C

6. The resistance of a conductor depends on:

• A) Length

• B) Area of cross-section

• C) Material

• D) All of the above

7. The resistivity of a wire is , its length is 2 m and cross-sectional area is . What is its resistance?

• A. 0.034 Ω

• B. 0.017 Ω

• C. 0.85 Ω

• D. 1.7 Ω

8. Which instrument is used to measure current?

• A) Voltmeter

• B) Ammeter

• C) Galvanometer

• D) Thermometer

9. The resistance of a wire increases with:

• A) Decrease in length

• B)Increase in cross-section

• C) Increase in length

• D) Cooling

10. In a metallic conductor, current is due to:

• A) Free electrons

• B) Protons

• C) Holes

• D) Ions