Physics · JEE

Series and parallel combinations of resistors, temperature dependence of resistance Mock Test for JEE

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Syllabus context

Part of Current Electricity in JEE Main Physics.

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Q1PhysicsUnit 12: Current Electricity

The equivalent Resistance: This question has multiple correct options

Q2PhysicsUnit 12: Current Electricity

Two heater coils separately take 10 min and 5 min to boil a certain amount of water. If both the coils are connected in series, the time taken will be

Q3PhysicsUnit 12: Current Electricity

When two same conducting rod are kept at different temperature,

Q4PhysicsUnit 12: Current Electricity

If two resistors of resistance

30 \Omega

and

40 \Omega

are connected in parallel across a battery. The ratio of the potential difference across them is

Q5PhysicsUnit 12: Current Electricity

Nidhi has two bulbs connected across two cells in a simple circuit as shown. How can she make the bulbs glow dimmer?

Q6PhysicsUnit 12: Current Electricity

The resistance of an iron wire is

10 \Omega

and its temperature coefficient of resistance is

5 \times 10^{-3} /^{o} C .

A current of

30 \mathrm{mA}

is flowing in it at

20^{\circ} \mathrm{C}

. Keeping potential difference across its ends constant, if its temperature is increased to

120^{\circ} \mathrm{C}

then the current flowing in the wire will be (in

\mathrm{mA}

)

Q7PhysicsUnit 12: Current Electricity

In a parallel circuit of bulbs,

Q8PhysicsUnit 12: Current Electricity

For a metallic wire, the ratio

\frac{V}{i}

(where,

\mathbf{V}=

applied potential difference and

\mathbf{i}=

current flowing

Q9PhysicsUnit 12: Current Electricity

Two resistance thermometers are made, one of the platinum wire and the other of germanium wire. The resistance of both the thermometers are equal at room temperatures. Now the two resistance wires are connected to a battery. The two resistance wire are heated to

100^{\circ} \mathrm{C}

. The potential drop in the two resistance is measured. Which of the following statements is correct?

Q10PhysicsUnit 12: Current Electricity

Assertion The temperature coefficient of resistance is always positive. Reason On increasing the temperature the resistance of metals and alloys increase.

Q11PhysicsUnit 12: Current Electricity

A letter

A

is constructed of a uniform wire of resistance

1 \Omega / c m .

The sides of the letter are

20 \mathrm{cm}

and the cross piece in the middle is

10 \mathrm{cm}

long.The resistance between the ends of the legs will be:

Q12PhysicsUnit 12: Current Electricity

A bulb is connected to a cell. How is the resistance of circuit affected if another identical bulb is connected in parallel?

Q13PhysicsUnit 12: Current Electricity

Two copper wires whose masses are 8 and 12 gm have lengths in the ratio 3: 4 Their resistances are in the ratio.

Q14PhysicsUnit 12: Current Electricity

An equilateral triangle has been constructed with an uniform wire whose resistance per unit length is 4 ohm

c m^{-1} .

If the length of each side of the triangle is

10 c,

the resistance across any side will be

Q15PhysicsUnit 12: Current Electricity

If four resistances, each of value 1 ohm, are connected in series, what will be the resultant resistance?

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