हैलोजन लैंप का तन्तु निम्न की मिश्रधातु का होता है-
The filament of a halogen lamp is an alloy of:
Collection of verified questions for Vidyut Dhara under General Science. Includes previous year exam questions with official answer keys and step-by-step solutions.
The filament of a halogen lamp is an alloy of:
A fuse is used as a safety device in mains electrical supply. Which one of the following statements regarding a fuse is correct?
The device that converts alternating current (AC) into direct current (DC) is called:
The lengths, diameters, and resistivities of two wires are all in the ratio 1:2. If the resistance of the thinner wire is 10 ohms, the resistance of the thicker wire will be:
Which of the following is the best conductor of electricity?
Alternating current (AC) is not suitable for:
A fluorescent tube is preferred over an incandescent electric bulb because:
A mobile phone charger is:
No electric current flows between two charged bodies connected together if they have the same:
Domestic electrical wiring is essentially a:
Which gas is filled in a common fluorescent tubelight?
Which gas is inside an electric bulb?
In domestic electrical supply, the wire with black insulation is:
Which of the following is a good conductor of electricity?
Assertion (A): Light Emitting Diode (LED) lamps offer a longer lifespan compared to Compact Fluorescent Lamps (CFL). Reason (R): Light Emitting Diode (LED) lamps are more energy efficient than CFLs. Code:
Organic Light Emitting Diodes (OLEDs) are used to create digital displays in many devices. What are the advantages of OLED displays over Liquid Crystal Displays (LCDs)? 1. OLED displays can be fabricated on flexible plastic substrates. 2. Roll-up displays embedded in clothing can be made using OLEDs. 3. Transparent displays are possible using OLEDs. Select the correct answer using the code given below:
How is white light produced in a fluorescent discharge tube?
What is the difference between CFL and LED lamps? 1. To produce light, CFL uses mercury vapor and phosphor, while LED lamp uses semiconductor material. 2. The average lifespan of CFL is much longer than that of LED lamp. 3. CFL is less energy-efficient compared to an LED lamp. Which of the statements given above is/are correct?
Assertion (A): Transformers are used for stepping up or stepping down voltage. Reason (R): Transformer is a device used in direct current (DC) circuits. In the context of the two statements, which of the following is correct? Code:
The principle of an electric fuse is:
Assertion (A): In India, electricity distribution companies bill power consumption in kWh (kilowatt-hours). Reason (R): In India, the electric power distribution system operates at 60 Hz frequency.
The essential difference between an AC generator and a DC generator is that:
The full form of C.F.L. is:
Which element has the highest electrical conductivity?
Assertion (A): The temperature of a metal wire increases when electric current flows through it. Reason (R): Heat energy is released due to collisions between metal molecules. Code: