Electricity

11.A wire is earthed in electrical fittings because of-
 
A. If there is a short circuit, then the current will go into the ground.
 
B. It does not cause loss of electricity
 
C. It completes the electric circuit
 
D. This removes the accentuation of electricity
 
Option “A” is correct.
Earthing is used to protect you from an electric shock. It does this by providing a path (a protective conductor) for a fault current to flow to earth. It also causes the protective device (either a circuit-breaker or fuse) to switch off the electric current to the circuit that has the fault.
12.Earth is used in electrical equipment-
 
A. To reduce costs
 
B. Because the appliances work in 3-phase
 
C. For security
 
D. As a fuse
 
Option “C” is correct
13.The resistance of an ideal voltmeter is-
 
A. Zero
 
B. Lower
 
C. Infinite
 
D. High
 
Option “C” is correct.
  1. Voltmeter: A voltmeter would be an instrument as well as a gadget that measures the voltage or potential difference throughout the endpoints or the terminals of a wire as well as an electrical device.
  2. Whenever they connect the voltmeter device in parallel, the resistance should always be equivalent to infinity. As we are not changing this same voltage or current throughout the existing circuit
  3. Hence high resistance will lead to no current
  4. The current flow for such a perfect (ideal) voltmeter would be zero.

Therefore, the resistance of an ideal voltmeter will be infinite.

14.“The algebraic sum of all the currents meeting at a point in a circuit is equal to zero”. This statement is
 
A. Kirchhoff’s Junction Rule
 
B. Ampere’s Circuit Law
 
C. Kirchhoff’s loop Rule
 
D. Lenz Rule
 
Option “A” is correct
15.The resistance of a conductor is 440 ohms, if it is connected to a 110 volt source, how much current will flow through it?
 
A. 0.5A
 
B. 2.5A
 
C. 4A
 
D. 1.25A
 
Option “B” is correct.
V = 110V
R = 44ohm.
I = V / R
= 110 / 44
= 2.5 Ampere
16.is the unit of resistance
 
A. Ampere
 
B. Columb
 
C. Henry
 
D. Ohm
 
Option”D” is correct
17.Fans, bulbs, etc. are installed in the houses.
 
A. In grade order
 
B. In mixed order
 
C. In parallel
 
D. In any order
 
Option “C” is correct
18.The potential difference across the ends of a conductor is proportional to the current flowing through it.
 
A. Coulomb’s law
 
B. Faraday’s law
 
C. Joule’s law
 
D. Ohm’s law
 
Option”D” is correct.
The Ohm’s law states that at constant temperature the current flowing through a conductor is directly proportional to the potential difference across its ends .
19.If the diameter of a wire is halved, then its resistance-
 
A. Will be half
 
B. Will double
 
C. One fourth will be left
 
D. four times 
 
Option”D” is correct
20.Ohm’s law is all about __
 
A. To resistance
 
B. Stream only
 
C. Voltage only
 
D. Both current and voltage
 
Option “D” is correct.
. Ohm’s law states that the voltage across a conductor is directly proportional to the current flowing through it, provided all physical conditions and temperatures remain constant.

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