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Class 10 Exam  >  Class 10 Tests  >  Case Based Questions Test: Electricity - 3 - Class 10 MCQ

Case Based Questions Test: Electricity - 3 - Class 10 MCQ


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15 Questions MCQ Test - Case Based Questions Test: Electricity - 3

Case Based Questions Test: Electricity - 3 for Class 10 2024 is part of Class 10 preparation. The Case Based Questions Test: Electricity - 3 questions and answers have been prepared according to the Class 10 exam syllabus.The Case Based Questions Test: Electricity - 3 MCQs are made for Class 10 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Case Based Questions Test: Electricity - 3 below.
Solutions of Case Based Questions Test: Electricity - 3 questions in English are available as part of our course for Class 10 & Case Based Questions Test: Electricity - 3 solutions in Hindi for Class 10 course. Download more important topics, notes, lectures and mock test series for Class 10 Exam by signing up for free. Attempt Case Based Questions Test: Electricity - 3 | 15 questions in 30 minutes | Mock test for Class 10 preparation | Free important questions MCQ to study for Class 10 Exam | Download free PDF with solutions
Case Based Questions Test: Electricity - 3 - Question 1
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In the given circuit, connect a nichrome wire of length ‘L’ between points X and Y and note the ammeter reading Answer the questions:

Q. When this experiment is repeated by inserting another nichrome wire of the same thickness but twice the length (2L), what changes are observed in the ammeter reading ?

Detailed Solution for Case Based Questions Test: Electricity - 3 - Question 1

ammeter reading will decrease (becomes half) Explanation: The ammeter reading will decrease (becomes half). This is because with the increase in length, resistance of the circuit increases, hence current decreases.

Case Based Questions Test: Electricity - 3 - Question 2
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n the given circuit, connect a nichrome wire of length ‘L’ between points X and Y and note the ammeter reading Answer the questions:

Q. The instrument used to measure current is ____________.

Detailed Solution for Case Based Questions Test: Electricity - 3 - Question 2
An instrument called ammeter measures electric current in a circuit. It is always connected in series in a circuit through which the current is to be measured. Also ammeter has negligible resistance, thus no voltage gets dropped across it.
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Case Based Questions Test: Electricity - 3 - Question 3
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n the given circuit, connect a nichrome wire of length ‘L’ between points X and Y and note the ammeter reading Answer the questions:

Q. State the changes that are observed in the ammeter reading if we double the area of the cross section without changing the length in the above experiment.

Detailed Solution for Case Based Questions Test: Electricity - 3 - Question 3

The ammeter reading will increase (becomes two times). This is because as area increases, resistance decreases and hence current increases.

Case Based Questions Test: Electricity - 3 - Question 4
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n the given circuit, connect a nichrome wire of length ‘L’ between points X and Y and note the ammeter reading Answer the questions:

Q. When nichrome and copper wire of same length and same radius are connected in series and current I is passed through them. Which wire gets heated up more?
Detailed Solution for Case Based Questions Test: Electricity - 3 - Question 4
Resistance of nichrome is greater than copper wire of the same length and same radius, because the former has greater resistivity.

In series, Power loss P = I2R. Because of higher resistance power loss and heating up of nichrome wire is more than that of copper.

Case Based Questions Test: Electricity - 3 - Question 5
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n the given circuit, connect a nichrome wire of length ‘L’ between points X and Y and note the ammeter reading Answer the questions:

Q. In a circuit two resistors of 5 Ω and 10 Ω are connected in series. Compare the current passing through the two resistors.
Detailed Solution for Case Based Questions Test: Electricity - 3 - Question 5
In a series connection of resistors, the same current passes through all the resistors. Hence, the current will be the same. Ratio of the currents will be 1 : 1.
Case Based Questions Test: Electricity - 3 - Question 6
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Observe the following table and answer the questions. Electrical resistivities of some substances, at 20°C are given as follows:

Q. Which is a better conductor of electric current:
Detailed Solution for Case Based Questions Test: Electricity - 3 - Question 6
Metals are good conductors of electricity. silver is found in in pure form from the earth. so In the given options all are metals. Among them silver is the best conductor of electricity after second best conductor of electricity is gold.
Case Based Questions Test: Electricity - 3 - Question 7
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Observe the following table and answer the questions. Electrical resistivities of some substances, at 20°C are given as follows:

Q. Series arrangement is not used for domestic circuits because:
Detailed Solution for Case Based Questions Test: Electricity - 3 - Question 7
In series circuits voltage is divided. Each component of a series circuit receives a small voltage so the amount of current decreases and the device becomes hot and does not work properly. Hence, the series arrangement is not used in domestic circuits.
Case Based Questions Test: Electricity - 3 - Question 8
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Observe the following table and answer the questions. Electrical resistivities of some substances, at 20°C are given as follows:

Q. Which element will be used for electrical transmission lines:
Detailed Solution for Case Based Questions Test: Electricity - 3 - Question 8
Copper wires can be used for electrical transmission lines because copper has lower resistivity. Power loss in the form of heat is minimum when electricity is passed through copper wires.
Case Based Questions Test: Electricity - 3 - Question 9
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Observe the following table and answer the questions. Electrical resistivities of some substances, at 20°C are given as follows:

Q. If the resistance is to be increased, then the resistors are to be increased in:
Detailed Solution for Case Based Questions Test: Electricity - 3 - Question 9
Equivalent resistance is maximum and current flow is minimum when number of resistances are connected in series. Req = R1 + R2 + R3 ; where R1 ,R2 ,R3 are resistances.
Case Based Questions Test: Electricity - 3 - Question 10
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Observe the following table and answer the questions. Electrical resistivities of some substances, at 20°C are given as follows:

Q. Nichrome is used in the heating elements of electric heating device because:
Detailed Solution for Case Based Questions Test: Electricity - 3 - Question 10
Nichrome is used for making heating elements of electrical appliances. Because nichrome does not oxidize and burn easily at high temperature i.e.it has higher melting and boiling point than metals. Thus it does not melt even when a large amount of heat is produced due to passage of current. Moreover, It has higher resistivity and consequently a higher resistance.Therefore, it will resist the flow of charges more, and lead to development of heat faster.
Case Based Questions Test: Electricity - 3 - Question 11
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Study the given table and answer the questions :

Q. Which is a better conductor:
Detailed Solution for Case Based Questions Test: Electricity - 3 - Question 11

Nickel is a fairly good conductor of electricity and heat and is one of only four elements (cobalt, iron, nickel and gadolinium) that are ferromagnetic (magnetized easily) at room temperature.

Case Based Questions Test: Electricity - 3 - Question 12
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Study the given table and answer the questions :

Q. What happens to resistance of a conductor when its area of cross section is increased?
Detailed Solution for Case Based Questions Test: Electricity - 3 - Question 12
On increasing the area of cross-section, resistance decreases. This is because resistance is inversely proportional to area.
Case Based Questions Test: Electricity - 3 - Question 13
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Study the given table and answer the questions :

Q. Element used to make heating element of electric geyser:
Detailed Solution for Case Based Questions Test: Electricity - 3 - Question 13
Nichrome: Most resistance wire heating elements usually use nichrome 80/20 (80% Nickel, 20% Chromium) wire, ribbon, or strip. Nichrome 80/20 is an ideal material, because it has relatively high resistance and forms an adherent layer of chromium oxide when it is heated for the first time.
Case Based Questions Test: Electricity - 3 - Question 14
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Study the given table and answer the questions :

Q. A given length of a wire is doubled and this process is repeated once again. The resistance of wire becomes:
Detailed Solution for Case Based Questions Test: Electricity - 3 - Question 14
Length becomes one-fourth of the original length and area of cross-section becomes four times that of original.

So, new resistance is (1/16)th of original resistance.

Case Based Questions Test: Electricity - 3 - Question 15
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Study the given table and answer the questions :

Q. Element used to make filament of incandescent bulb:
Detailed Solution for Case Based Questions Test: Electricity - 3 - Question 15
Incandescent light bulbs have filaments which are made mainly from the element tungsten, the metal element used for the filaments in incandescent light bulbs.
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