D.C Basic and network and electromagnetic theory. part - 2

11.  With rise in temperature the resistance of semi – conductors

A. Decreases

B. Increases

C. First increases and then decreases

D. Remain constant

12. A current of 16 Amp. Divides between two branches in parallel of resistance 8Ω and 12Ω resp. the Current in each branches is

A. 16.4 A, 16.9 A

B. 6.4 A, 9.6 A

C. 0.6 A, 0.9 A

D. 8.2 A, 12.9 A

13. A 40 watt bulb is connected in series with a room heater. If now 40 watt bulb is replaced by 100 watt bulb, the heater output will

A. Decreases

B. Remain same

C. Heater will burn out

D. Increases

14. Sparking occurs when a load is switched off because the circuit has high

A. Resistance

B. Capacitance

C. Inductance

D. Impedance

15. Which of the following is a vector quantity?

A. Magnetic field intensity

B. Relative permeability

C. Flux density

D. Magnetic potential

16. Which of the following material has least resistivity?

A. Zinc

B. Mercury

C. Lead

D. Copper

17. A capacitor with initial charge q₀ at t = 0⁺ acts as

A. Voltage source

B. Current source

C. Open circuit

D. Short circuit

18. An ideal voltage soured has,

A. Low internal resistance

B. High internal resistance

C. Zero internal resistance

D. Infinite internal resistance

19. What is the unit of electrical energy?

A. Watt

B. Kwh

C. Volt

D. Ampere

20. If the distance between two point charges of electricity is doubled, the electrostatic force between them will be:

A. Same as original force

B. ½ of the original force

C. 1/4^th of the original force

D. Double the original force