Test: Current Electricity (December 7) - NEET MCQ

# Test: Current Electricity (December 7) - NEET MCQ

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## 15 Questions MCQ Test Daily Test for NEET Preparation - Test: Current Electricity (December 7)

Test: Current Electricity (December 7) for NEET 2024 is part of Daily Test for NEET Preparation preparation. The Test: Current Electricity (December 7) questions and answers have been prepared according to the NEET exam syllabus.The Test: Current Electricity (December 7) MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Current Electricity (December 7) below.
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Test: Current Electricity (December 7) - Question 1

### Two electric bulbs, one of 200 V, 40W and otherof 200 V, 100W are connected in a domesticcircuit. Then [2000]

Detailed Solution for Test: Current Electricity (December 7) - Question 1

∴ R1 (for 40W) > R2 (for 100 W)

Test: Current Electricity (December 7) - Question 2

### Five resistances have been connected as shown in the figure. The effective resistance between A and B is

Detailed Solution for Test: Current Electricity (December 7) - Question 2

It is a balanced wheatstone bridge    , so the 7Ω resistance is
ineffective.
Equivalent resistance of 3Ω and 4Ω = 3 + 4
= 7Ω (series)
Equivalent resistance of 6Ω and 8Ω = 6 + 8
=14Ω (series)
Equivalent resistance of 7Ω and 14Ω (parallel)

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Test: Current Electricity (December 7) - Question 3

### Si and Cu are cooled to a temperature of 300 K,then resistivity? [2001]

Detailed Solution for Test: Current Electricity (December 7) - Question 3

For metals specific resistance decrease with decrease in temperature where as for semiconductors specific resistance increases with decrease in temperature.

Test: Current Electricity (December 7) - Question 4

A battery of 10 V and internal resistance 0.5Ω isconnected across a variable resistance R. Thevalue of R for which the power delivered ismaximum is equal to [1992, 2001]

Detailed Solution for Test: Current Electricity (December 7) - Question 4

Power is maximum when r = R, R = r = 0.5Ω.

Test: Current Electricity (December 7) - Question 5

Two 220 volt, 100 watt bulbs are connected firstin series and then in parallel. Each time thecombination is connected to a 220 volt a.c.supply line. The power drawn by thecombination in each case respectively will be   [2003]

Detailed Solution for Test: Current Electricity (December 7) - Question 5

In series combination, resistance doubles.

Hence, power will be halved.
In parallel combination, resistance halves.
Hence, power will be doubled.

Test: Current Electricity (December 7) - Question 6

In a Wheatstone’s bridge all the four arms have equal resistance R. If the resistance of the galvanometer arm is also R, the equivalent resistance of the combination as seen by the battery is    [2003]

Detailed Solution for Test: Current Electricity (December 7) - Question 6

Since, Wheatstone's bridge is balanced, then
resistance of galvanometer will be
uneffective.

Test: Current Electricity (December 7) - Question 7

A car battery has e.m.f. 12 volt and internalresistance 5 × 10–2 ohm. If it draws 60 amp current,the terminal voltage of the battery will be   [2000]

Detailed Solution for Test: Current Electricity (December 7) - Question 7

Test: Current Electricity (December 7) - Question 8

An electric kettle has two heating coils. Whenone of the coils is connected to an a.c. source,the water in the kettle boils in 10 minutes. Whenthe other coil is used, the water boils in 40minutes. If both the coils are connected inparallel, the time taken by the same quantity ofwater to boil will be    [2003]

Detailed Solution for Test: Current Electricity (December 7) - Question 8

Test: Current Electricity (December 7) - Question 9

In a metre-bridge, the balancing length from theleft end when standard resistance of 1 Ω is inright gap is found to be 20 cm. The value ofunknown resistance is [1999]

Detailed Solution for Test: Current Electricity (December 7) - Question 9

Let unknown resistance be X. Then
condition of Wheatstone's bridge gives  where r is resistance of wire
per cm.

Test: Current Electricity (December 7) - Question 10

When three identical bulbs of 60 watt, 200 voltrating are connected in series to a 200 voltsupply, the power drawn by them will be        [2004]

Detailed Solution for Test: Current Electricity (December 7) - Question 10

Test: Current Electricity (December 7) - Question 11

Resistances n, each of r ohm, when connectedin parallel give an equivalent resistance of Rohm. If these resistances were connected inseries, the combination would have a resistancein ohms, equal to [2004]

Detailed Solution for Test: Current Electricity (December 7) - Question 11

When connected in series, Req = nr
= n (nR) = n2R

Test: Current Electricity (December 7) - Question 12

Potentiometer measures potential moreaccurately because [2000]

Detailed Solution for Test: Current Electricity (December 7) - Question 12

Potentiometer measures potential current
more accurately because it measure potential
in open circuit and hence error in potential
due to internal resistance is removed.

Test: Current Electricity (December 7) - Question 13

A battery is charged at a potential of 15V for 8hours when the current flowing is 10A. Thebattery on discharge supplies a current of 5Afor 15 hours. The mean terminal voltage duringdischarge is 14V. The “watt-hour” efficiency ofthe battery is [2004]

Detailed Solution for Test: Current Electricity (December 7) - Question 13

Efficiency is given by η = output/input

Test: Current Electricity (December 7) - Question 14

For the network shown in the Fig. the value of the current i is [2005]

Detailed Solution for Test: Current Electricity (December 7) - Question 14

It is a balanced Wheatstone bridge. Hence
resistance 4Ω can be eliminated.

Test: Current Electricity (December 7) - Question 15

The electric resistance of a certain wire of iron isR. If its length and radius are both doubled, then

Detailed Solution for Test: Current Electricity (December 7) - Question 15

∴ Resistance is halved, but specific
resistance remains the same.

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