JEE Main 2022 (Online) 25th June Morning Shift | Current Electricity Question 140 | Physics

JEE Main 2022 (Online) 25th June Morning Shift

MCQ (Single Correct Answer)

-1

A teacher in his physics laboratory allotted an experiment to determine the resistance (G) of a galvanometer. Students took the observations for $${1 \over 3}$$ deflection in the galvanometer. Which of the below is true for measuring value of G?

$${1 \over 3}$$ deflection method cannot be used for determining the resistance of the galvanometer.

$${1 \over 3}$$ deflection method can be used and in this case the G equals to twice the value of shunt resistances.

$${1 \over 3}$$ deflection method can be used and in this case, the G equals to three times the value of shunt resistances.

$${1 \over 3}$$ deflection method can be used and in this case the G value equals to the shunt resistances.

JEE Main 2022 (Online) 24th June Evening Shift

MCQ (Single Correct Answer)

-1

What will be the most suitable combination of three resistors A = 2$$\Omega$$, B = 4$$\Omega$$, C = 6$$\Omega$$ so that $$\left( {{{22} \over 3}} \right)$$$$\Omega$$ is equivalent resistance of combination?

Parallel combination of A and C connected in series with B.

Parallel combination of A and B connected in series with C.

Series combination of A and C connected in parallel with B.

Series combination of B and C connected in parallel with A.

JEE Main 2022 (Online) 24th June Morning Shift

MCQ (Single Correct Answer)

-1

Two identical cells each of emf 1.5 V are connected in parallel across a parallel combination of two resistors each of resistance 20 $$\Omega$$. A voltmeter connected in the circuit measures 1.2 V. The internal resistance of each cell is :

2.5 $$\Omega$$

4 $$\Omega$$

5 $$\Omega$$

10 $$\Omega$$

JEE Main 2021 (Online) 1st September Evening Shift

MCQ (Single Correct Answer)

-1

Due to cold weather a 1 m water pipe of cross-sectional area 1 cm² is filled with ice at $$-$$10$$^\circ$$C. Resistive heating is used to melt the ice. Current of 0.5A is passed through 4 k$$\Omega$$ resistance. Assuming that all the heat produced is used for melting, what is the minimum time required? (Given latent heat of fusion for water/ice = 3.33 $$\times$$ 10⁵ J kg^$$-$$1, specific heat of ice = 2 $$\times$$ 10³ J kg^$$-$$1 and density of ice = 10³ kg/m³

0.353 s

35.3 s

3.53 s

70.6 s

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