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Transformers are used for:
Comprehensive collection of questions from General Science asked in recent state service examinations. Each question is verified with official answer keys and step-by-step bilingual solutions.
Transformers are used for:
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:
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:
The essential difference between an AC generator and a DC generator is that:
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.
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:
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:
Which gas is filled in a common fluorescent tubelight?
In domestic electrical supply, the wire with black insulation is:
Alternating current (AC) is not suitable for:
If the electric current flowing in a wire and the potential difference are both doubled, the electric power will:
How is white light produced in a fluorescent discharge tube?
The full form of C.F.L. is:
The device that converts alternating current (AC) into direct current (DC) is called:
Small identical droplets are charged to a potential $V$. If $n$ such droplets coalesce to form a single larger drop, the potential of this drop will be:
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:
A mobile phone charger is:
Domestic electrical wiring is essentially a:
Which of the following is the best conductor of electricity?
No electric current flows between two charged bodies connected together if they have the same:
The principle of an electric fuse is:
In a house, two bulbs are installed. One glows brighter than the other. Which of the following statements is correct?
The filament of an electric bulb is made of:
A dynamo, which is said to generate electricity, actually acts as:
If a 100-watt electric bulb is lighted for 10 hours, what will be the electricity expenditure at the rate of Rs. 5 per unit?