Explore topic-wise InterviewSolutions in Current Affairs.

Tungsten has higher resistivity values and melting point. So, we consider tungsten as a suitable material for making the filament of a bulb.

• A source has chemical energy which transfers electrons to the conductor. 
• The conductor carries the electrons to the bulb when connected. 
• Thus, the conductor transfers energy from source to bulb.

B) Both statements are false

Semiconductors are used to make diodes, transistors, and integrated circuits.

The melting point of tungsten is 3422° C.

Temperature, nature of the material, length of the conductor, and cross-section area are the factors that affect resistance.

R = \(\frac{ρl}{A}\) (p = density, l = length of the conductor, A = the cross-section area).

The resistance of the conductor depends on the following factors:

• The temperature of the conductor
• The cross-sectional area of the conductor
• Length of the conductor
• Nature of the material of the conductor

Factors affecting resistance of a conductor:

1. Length of conductor 

2. Area of cross-section 

3. Nature of material

The resistance of a conductor is defined as the obstruction to the motion of the electrons in a conductor.

Correct option is  C) voltmeter

B) an ammeter

Correct option is  B) silver

Correct option is  A) voltmeter

The voltmeter must be connected in parallel to the electric device to measure the potential difference across the ends of the electric device.

Power consumption = 100 W x 10 h/ 1000

1 KWH or 1 unit

Work done by the electric force on unit positive charge to move it through a distance is called potential difference.

Conductors like metals contain a large number of free electrons while the positive ions are fixed in their locations. The arrangement of the positive ions is called lattice.

The arrangement of positive ions in a conductor is known as lattice

A closed path created by the connecting wires through a battery along which the electrons conductor is called a circuit.

Correct option is  A) watt

The product of electric power and time is called electric energy.

R₁ : R₂ = 6 : 4 

R₁ : R₂ = 3 : 2 

i₁ : i₂ = R₂ : R₁ = 2 : 3 

∴ i₁ = 2A 

i₂ = 3A

The resistance of the human body generally varies from 100 Ω (if the body is wet with salt water) to 5,00,000 Ω (if the skin is very dry).

The product of voltage and electric current is called electric power.

If the current drawn by a resistor is equal to the current drawn by the combination of resistors, then the resistor is called an equivalent resistor.

The material which offers resistance to the motion of electrons is called a resistor.

It is an electronic measuring instrument that combines several measurement functions in one unit.

The material which offers resistance to the motion of electrons is called a resistor.

V = IR, where V is the potential difference (voltage), I is the electric current and R is the resistance.

V = IR is applicable for 

a) Ohmic conductors, 

b) Non-ohmic conductor.

I = V/R

= 6 Volt/15Ω = 2/5

= 0.4 AMP

Correct option is  B) decreases

Correct option is  A) 10 Ω

When a high current flows through the wire which is beyond the rating of wire then heating of wire takes place. This phenomenon is called overloading.

The magnitude of the electric charge is 1.602 × 10^-19 C.

It is equal to W/t

Ammeter always connected in series to the circuit.

The electron density of copper is 8.5 × 10²⁸ m^-3.

An ammeter is used to measure electric current.

The electric shock is a combined effect of potential difference, electric current, and resistance of the human body.

The direction of the electric current is the direct flow of positive charges.

The SI unit of the electric current is ampere (A).

1 Ampere = \(\frac{1\,coulomb}{1 \,second}\)

The direction of the electric field is from positive terminal to negative terminal in the conductor.

By the signs of the charge and drift speed.

Correct option is  B) parallel

Correct option is  C) one volt

Correct option is  B) ampere

C) X is true, Y is false

Correct option is  A) coloumb

B) 1.602 × 10^-19C 

C) potential difference between A and B