Electricity

1.	The SI unit of specific resistance is
	A. Om
	B. ohm-meter
	C. ohm/m
	D. ohm/m² Option “B” is correct. Specific Resistance (”ρ”) is a property of any conductive material, a figure used to determine the end-to-end resistance of a conductor given length and area in this formula: R = ρl/A. Specific resistance for materials are given in units of Ω-cmil/ft or Ω-meters (metric)

2.	If a wire of resistance R is stretched to double of its length, then new resistance will be:
	A. R/2
	B. 2R
	C. 4R
	D. 16R Option “D” is correct

3.	Ammonium chloride used in dry cell acts as
	A. Catalyst
	B. Electrolyte
	C. Polariser
	D. Both (1) and (3) Option “C” is correct. A dry cell is a type of battery, commonly used for portable electrical devices.A standard dry cell comprises a zinc anode, usually in the form of a cylindrical pot, with a carbon cathode in the form of a central rod. The electrolyte is ammonium chloride in the form of a paste next to the zinc anode.Ammonium chloride is a strong electrolyte. In dry cell, the electrolyte ammonium chloride forms ammonium ion and chloride ions.

4.	Match List-I with List-II and select the correct answer from the code given below the Lists : List-I A. Negative electrode B. Positive electrode C. Electrolyte D. Depolarizer List-II 1. Carbon rod 2 1. Zinc vessel 3. Ammonium chloride paste 4. Manganese dioxide
	A. A → 4, B → 3, C → 2, D → 1
	B. A → 1, B → 2, C → 4, D → 3
	C. A → 2, B → 1, C → 3, D → 4
	D. A → 1, B → 2, C → 3, D → 4 Option”C” is correct

5.	The electrolyte used in a car battery is
	A. Hydrochloric acid
	B. Sulphuric acid
	C. Nitric acid
	D. Distilled water Option “B” is correct. The electrolyte used in the car batteries is Sulphuric acid(H2SO4).

6.	Dry cell is a __
	A. Primary cell
	B. Secondary cell
	C. Tertiary cell
	D. Quartile cell Option “A” is correct. There are two basic types of batteries: primary and secondary. Primary batteries are “single use” and cannot be recharged. Dry cells and (most) alkaline batteries are examples of primary batteries. The second type is rechargeable and is called a secondary battery.

7.	What is the coating of zinc over iron called?
	A. Galvanization
	B. Electroplating
	C. Anon
	D. None of these Option “A” is correct. The process of coating of zinc over iron is known as Galvanization. It prevents rusting of iron. Zinc is corroded in preference to iron.

8.	In the process of electrolysis, the amount of substance liberated at an electrode is directly proportional to the total flowing charge. This law is-
	A. Faraday’s first law of electrolysis
	B. Faraday’s second law of electrolysis
	C. Faraday’s third law of electrolysis
	D. None of these Option “A” is correct. Faraday’s first law states that the mass of a substance deposited or liberated at any electrode is directly proportional to the quantity of electricity passed through the electrolytic solution.

9.	If there is no change in the physical state of a conductor like temperature etc., then the potential difference applied across the conductor is directly proportional to the current flowing in it. This is the rule.
	A. Coulomb’s law
	B. Ohm’s Law
	C. Faraday’s law
	D. Kirchhoff’s law Option “B” is correct. Ohm’s law states that the voltage across a conductor is directly proportional to the current flowing through it, provided all physical conditions and temperature, remain constant.

10.	Faraday’s law is related to-
	A. Electrolysis
	B. Pressure of gases
	C. Electrocution
	D. By electroplating Option “A” is correct. Faraday’s law of electromagnetic , also known as Faraday’s law, is the basic law of electromagnetism which helps us predict how a magnetic field would interact with an electric circuit to produce an electromotive force (EMF). This phenomenon is known as electromagnetic induction.

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