TS EAPCET (Engineering) Current Electricity — practice questions
100 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice TS EAPCET (Engineering) Current Electricity in the app →Ohm's law states that, for an ohmic conductor at constant temperature:Three identical resistors, each of resistance $R$, are connected in **parallel**. The equivalent resistance isKirchhoff's **voltage (loop) law** in any closed loop of an electrical network states:The balance condition for a Wheatstone bridge with arms $P, Q, R, S$ (galvanometer between B and D) is:In an electrical network, a **junction** is defined as:In an electrical network, a **loop** (mesh) is:Kirchhoff's first law (junction law) is a consequence of:Kirchhoff's second law (voltage/loop law) is a consequence of:The **potential gradient** $K$ along a uniform potentiometer wire is defined as:While applying Kirchhoff's first law, currents **arriving** at the junction are considered:An **ideal voltmeter** measuring a potential difference should have:Three resistors of values 2 Ω, 3 Ω and 6 Ω are connected in parallel between two nodes. The equivalent resistaWhile tracing a loop **in the direction of current** through a resistor, the potential difference across that An emf source is traversed from its negative to positive terminal while tracing a loop. The EMF contribution tWheatstone bridge is typically used to measure resistances in the range:For a balanced Wheatstone bridge with $P = 1.36\ k\Omega$, $R = 300\ \Omega$ and $S = 4.4\ k\Omega$, the unknoThe specific resistance ρ of a metre-bridge wire of length 1 m, diameter 0.12 cm and resistance 1.49 Ω is apprThe SI unit of electric current is:The current I is related to charge q and time t by:Electric current is a:Ohm's law states V = ___ ?The SI unit of resistance is:For resistors in series, the equivalent resistance is:For resistors in PARALLEL, the equivalent resistance is given by:Kirchhoff's Current Law (KCL) is based on conservation of:Kirchhoff's Voltage Law (KVL) is based on conservation of:A galvanometer can be CONVERTED to an ammeter by:Find the equivalent resistance of 2 Ω and 3 Ω connected in SERIES:Find the equivalent resistance of 6 Ω and 3 Ω in PARALLEL:A battery with emf 12 V and internal resistance 1 Ω drives 2 A current. Find terminal voltage V:Resistance R of a conductor is proportional to:Two resistors 4 Ω and 12 Ω are in parallel; this combination is in series with 8 Ω. Total resistance:Drift velocity v_d is given by:In a Wheatstone bridge, BALANCE condition gives:A 2 Ω, 4 Ω and 6 Ω resistor are in parallel. Equivalent resistance:To convert a galvanometer to a VOLTMETER, connect:Three cells of emf 2 V each, internal resistance 0.5 Ω each, are connected in series. Total emf and internal rThree identical cells with emf 1.5V and internal resistance 0.6 Ω each are connected in parallel. Find equivalIf a wire of resistance R is cut into 4 equal parts and joined in parallel, the new resistance is:A potentiometer is a NULL device used to:A 10 V battery is connected across a 5 Ω resistor. The current through the resistor is:Specific resistivity (ρ) of a conductor depends mainly on:An ammeter has 0.1 Ω resistance and 1 mA full-scale current. The shunt needed to extend range to 1 A:In a Wheatstone bridge: P = 4Ω, Q = 8Ω, R = 6Ω. For balance, S =Five identical bulbs are connected in series across an emf of 100V. Each bulb has resistance 5 Ω. Find total cA 12V battery (internal r = 0.5 Ω) drives current through 5.5 Ω external load. Find power dissipated in EXTERNA copper wire of length 1 m and cross-section 1 mm² has resistivity 1.7 × 10⁻⁸ Ω·m. Its resistance is:Two batteries with emf E₁ = 4V (r₁ = 1Ω) and E₂ = 6V (r₂ = 2Ω) in parallel. Find equivalent emf:A wire of resistance 10 Ω is stretched to double its length without changing volume. Its new resistance:Maximum power transfer from a source occurs when external resistance equals:In a meter bridge experiment, the null point divides the wire as 30 cm and 70 cm. If known resistance is 6 Ω, A resistor carries a current of 2 A when a potential difference of 10 V is applied across it. Its resistance iThe SI unit of current density is:For a uniform wire of resistance R = ρl/A, the resistivity ρ depends on:The power dissipated in a resistor of resistance R carrying a steady current I is:The emf of a cell is equal to the potential difference across its terminals when:Three resistors of 2 Ω, 3 Ω and 5 Ω are connected in series. The equivalent resistance is:Two 6 Ω resistors are connected in parallel. Their equivalent resistance is:A cell of emf 2 V and internal resistance 0.1 Ω is connected across a 3.9 Ω resistor. The current in the circuA cell of emf 2 V and internal resistance 0.1 Ω drives a current of 0.5 A. Its terminal potential difference iIn a metallic wire of fixed n and area A, if the current is doubled, the electron drift speed:A wire is stretched to twice its original length while keeping its volume constant. Its new resistance is:Two bulbs rated 100 W and 60 W are designed for the same supply voltage. Compared with the 60 W bulb, the 100 A platinum resistance thermometer reads 5.00 Ω at 0°C and 5.23 Ω at 100°C. When its resistance is 5.795 Ω, theThe heat produced in a 5 Ω resistor carrying a steady current of 2 A for 10 s is:Estimate the drift speed of electrons in a copper wire carrying 1.5 A with cross-section 1.0×10⁻⁷ m² and n = 8Two cells, each of emf 1.5 V and internal resistance 0.5 Ω, are connected in series across a 2 Ω resistor. TheTwo identical cells, each of emf 1.5 V and internal resistance 0.5 Ω, are connected in parallel across a 1 Ω rThe maximum current that can be drawn from a cell of emf 1.5 V and internal resistance 0.3 Ω is:A Wheatstone bridge is balanced with arms P = 10 Ω, Q = 20 Ω and R = 15 Ω. The unknown resistance S is:A 3 Ω resistor is connected in series with a parallel combination of a 6 Ω and a 3 Ω resistor. The equivalent Which material can show more than one voltage for the same current, so its V-I relation is not unique?A mobility of 1 m^2/(V s) equals how many cm^2/(V s)?Why are manganin and constantan used in standard resistors?Why does a semiconductor's resistivity fall on heating?Heating copper raises its resistivity mainly through which change?Metals typically have resistivities in which range?What does Ohm's law actually assert about a conductor?Which scientist discovered in 1828 that potential difference across a conductor is proportional to current?In the SI system, electric current is measured in which unit?A steady current through an area is best described as which ratio?A charge of 120 C passes through a wire in 40 s. What is the steady current?Currents in the nerves of the body are typically of what order?An average lightning stroke carries a current of what order of magnitude?What is the net current in a metal wire when no electric field is applied?What do cells and batteries do in a conductor?With no field applied, an electron leaves a collision with an ion. Its new direction is what?How does the drift velocity of conduction electrons relate to the electric field direction?Drift speed is given by vd = I/(neA). What does n stand for?Why does current start almost instantly on closing a circuit?Why do electrons reach a steady average drift speed?How can a large current flow with a drift speed of mm per second?Between successive collisions, how do electron paths look when an electric field is present?Mobility of a charge carrier is defined as the drift velocity per unit what?A uniform conductor has cross-section A, electron density n and drift velocity vd. What is the current?A wire has its length doubled with the same cross-section and material. What happens to its resistance?A wire is stretched to twice its length at constant volume. Resistance becomes how many times?Which lists materials by increasing resistivity?How does the resistivity of a semiconductor change as temperature rises?Why does the resistivity of a metal rise with temperature?