MHT-CET Current Electricity — practice questions
30 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice MHT-CET Current Electricity in the app →Kirchhoff's **junction (current) law** states that, at any junction in an electrical network:Kirchhoff'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:Five conductors meet at a junction P (see figure). Currents $I_1 = 2$ A and $I_3 = 5$ A flow **into** the juncThree resistors of values 2 Ω, 3 Ω and 6 Ω are connected in parallel between two nodes. The equivalent resistaIn a metre-bridge experiment, a known resistance $R = 5\ \Omega$ is in the right gap. The balance length on thTwo cells are compared using a potentiometer. The null lengths are $\ell_1 = 360$ cm for cell 1 and $\ell_2 = In Kelvin's method for galvanometer resistance using a metre bridge, the balance length opposite the galvanomeIn a Post Office Box (a Wheatstone-bridge variant), if the ratio arms have $P = 100\ \Omega$, $Q = 10\ \Omega$A potentiometer wire of length 4 m has a potential gradient $K = 0.5$ V/m. The EMF of a cell that balances at While 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 tIn a metre bridge experiment, the null point should ideally be obtained in the middle one-third (between 34 cmWheatstone bridge is typically used to measure resistances in the range:A potentiometer compares the EMFs of two cells. Cell 1 with $\varepsilon_1 = 1.5$ V gives a null length 75 cm.Two batteries of EMF 7 V (internal resistance 1 Ω) and 13 V (internal resistance 2 Ω) are connected in paralleFor a balanced Wheatstone bridge with $P = 1.36\ k\Omega$, $R = 300\ \Omega$ and $S = 4.4\ k\Omega$, the unknoIn a metre bridge with $X = 2\ \Omega$ in the left gap and $R = 3\ \Omega$ in the right gap, the wire (length The specific resistance ρ of a metre-bridge wire of length 1 m, diameter 0.12 cm and resistance 1.49 Ω is apprIn a network with cells of negligible internal resistance, applying Kirchhoff's laws gives the equations $4I_1For a Wheatstone bridge at balance, the bridge is **insensitive** to changes in the galvanometer's internal reA potentiometer wire of length 10 m carries a steady current. EMF $\varepsilon_1$ balances at 6 m; the same ceTwo cells of EMF $\varepsilon_1$ and $\varepsilon_2$ ($\varepsilon_1 > \varepsilon_2$) connected so that **lik