Q. Draft velocity of electrons is-
Ans. Very small in comparison to speed of light
Q. Ratio of the voltage and electric current in a closed circuit-
Ans. Remain constant
Q. Condition for the validity under Ohm’s law is that the
Ans. Temperature should remain co
Q. Resistance of a wire always increases if-
Ans. Number of free electrons available become less
Q. The resistance of wire varies inversely as-
Ans. Area of cross-section
Q. For a fixed supply voltage the current flowing through a conductor will increase when its-
Ans. Length is reduced
Q. A wire of length I and of circular cross section of radius r has resistance of R ohms. Another wire of same material and of cross-sectional radius 2r will have the same resistance R if the length is-
Ans. 4l
Q. Two resistance of equal value, when connected in parallel, give an equivalent resistance of R. if these resistors are connected in series , the equivalent resistance will be-
Ans. 4R
Q. The resistance of a parallel circuit consisting of two resistance is 12 . one of the resistance wires breaks and the effective resistance becomes 18 .the resistance of the broken wire is-
Ans. 36
Q. When one leg of a parallel circuit gets opened out, the current drawn from the supply will-
Ans. Reduce
Q. For a series as well as a parallel circuit-
Ans. Powers are additive
Q. A keeper is used for-
Ans. Providing a closed path for the magnetic flux
Q. When a resistance element of a heater gets fused we remove if now 10 W bulb is replaced by a 40 W bulb, the heater output will-
Ans. Decrease
Q. When the voltage applied across an electric iron is halved, the power consumption of the iron will reduce to-
Ans. One-fourth
Q. For a give line voltage, four heating coils will produce maximum heat when connected-
Ans. All in parallel
Q. Two lamps of 200 W, 220V,and 100W, 220V are connected in series across 220V supply the ratio of current through them will be-
Ans. 1:2
Q. Two heaters, rated at 1000 W, 250 V each are connected in series across 220V supply. The ratio of current through them will be-
Ans. 250W
Q. Ratio of resistances of a 100W,220V lamp to that of a 100W, 110V lamp will be that the respective voltages-
Ans. 4
Q. Four 100W bulbs are connected in parallel across 200V supply line. If one bulb gets fused-
Ans. Rest of the three bulbs will light
Q. A 200W, 230V lamp is connected across 112V supply. The will draw power-
Ans. Slightly more than 50W
Q. If the voltage across the lamp drops by 1% the power drawn will be reduced by-
Ans. 2%
Q. A 200W, 100V lamp is to be operated on 250V supply. The additional resistance required to be connected in series will be-
Ans. 75 ohm
Q. 1 Kwh is equal to-
Ans. 860 Kcal
Q. A 100W watt light bulb burns on an average of 10 hours a day for one week. The weekly consumption of energy will be-
Ans. Pt/1000kwh
Q. An ideal voltage source should have-
Ans. Zero source resistance
Q. For a voltage source, terminal voltage-
Ans. Cannot exceed source emf
Q. Constant voltage source is-
Ans. Passive and bilateral
Q. An ideal current source has zero-
Ans. Internal conductance
Q. Which of the following statements is incorrect an active element?
Ans. Resistance
Q. The terminals across the source are……. If a current source is to be neglected-
Ans. Open-circuited
Q. An active element in a circuit is-
Ans. Current source
Q. A bilateral element-
Ans. Resistor, inductor
Q. The circuit having same properties in either direction is called-
Ans. Bilateral circuit
Q. The element which is not capable of delivering energy by its own is called?
Ans. Passive elements
Q. A network having one or more any energy source of emf is called-
Ans. Active network
Q. A circuit having neither any energy source nor emf source is called-
Ans. Passive circuit
Q. A passive network has-
Ans. Neither current source nor emf source
Q. For determining the polarity of the voltage drop across a resistor we do not require value of-
Ans. Resistor, current
Q. Kirchhoff’s lawn are valid for-
Ans. Both linear and non-linear circuits
Q. According to Kirchhoff’s voltage law the algebraic sum of all IR drops and emfs in any closed loop of a network is always-
Ans. Zero
Q. The algebraic sign of an IR drop primarily depends upon the-
Ans. Direction of flow of current
Q. Maxwell circulating current theorem-
Ans. Utilises Kirchhoff’s voltage law
Q. While Thevenizing a circuit between two terminals VTH is equal to-
Ans. Open-circuit terminal voltage
Q. Thevenin’s theorem Z is determined by-
Ans. Open circuiting all independent voltage source and short circuiting all independence current source
Q. Theorems applicable for both linear and non-linear circuit is-
Ans. Norton’s
Q. While determining RTH in Thevenin’s and Norton’s equivalent are mode dead-
Ans. Only voltage source
Q. According to fuse law the current carrying capacity varies as-
Ans. (diameter)1.5
Q. The rating of fuse wire is always expressed in-
Ans. Ampere-volts
Q. The insulation on a current carrying conductor is provided to prevent-
Ans. Current leakage, Shock
Q. The thickness of insulation provided on the conductor depends upon-
Ans. Current rating
Q. When a heater is connected to the power supply the heater coil will glow but the supply wiring does not glow. This is because-
Ans. Internal wiring is of superior material
Q. Lamps in street lighting are all connected in-
Ans. Parallel
Q. Energy meter for connection has,
Ans. 6 terminals
Q. Electric battery is a device that-
Ans. Generates emf by chemical action
Q. EMF of a zinc-carbon cell is about-
Ans. 1.5V
Q. The depolarize in a carbon zinc cell-
Ans. Converts the hydrogen produced into water
Q. Capacity of a dry cell is-
Ans. More when it supplies current intermittently
Q. Cell commonly used as standard cell is-
Ans. Mercury cadmium cell
Rate of Chemical Reaction & Chemical Equilibrium in Hindi
Q. Internal resistance of primary cell varies-
Ans. Inversely with the surface area of electrodes
Q. The internal voltage drop of a voltage source-
Ans. Depends upon internal resistance of the source
Q. A voltage source of emf E volts and internal resistance r ohms will supply, on short circuit a current of-
Ans. E/r amperes
Q. Cells are connected in series in order to increases the-
Ans. Terminal voltage
Q. When two batteries of unequal voltage are connected in parallel the emf of the combination will be equal to the-
Ans. Emf of the large battery
Q. When two cells are connected in parallel it should be ensured that they have-
Ans. Equal emfs
Q. Cells are connected in parallel in order to increases the-
Ans. Current capacity
Q. For a group of cells when internal resistance of the group is equal to external load resistance the group will deliver maximum-
Ans. Current
Q. Electric supply for electro-deposition should ha-
Ans. Dc voltage
Q. In a lead acid battery the level of the electrolyte should be-
Ans. Above the level of plants
Q. In a lead acid battery the energy is stored in the from of-
Ans. Chemical energy
Q. The lead acid batteries-
Ans. It does not deliver current on putting its components together until it is supplied electrical energy from an external source
Q. During discharging of lead-acid cells, the terminal voltage decreases with the decreases in-
Ans. Discharge rate
Q. In a battery ,cover is placed over the elements and sealed at the top of the battery container to –
Ans. Exclude dirt and foreign matter from the electrolyte
Q. Petroleum jelly is applied to the terminal of the lead acid battery in order to prevent-
Ans. Corrosion
Q. For keeping the lead acid battery terminal free from corrosion it is advisable to-
Ans. Apply petroleum jelly
Q. In a lead acid battery, separators are provided to-
Ans. Avoid internal short-circuits
Q. In a lead acid battery, fillers are provided to-
Ans. Facilitate flow of gasses
Q. Tests performed for ascertaining whether the battery plants are defective or not is-
Ans. Cadmium test
Q. In lead acid batteries, sedimentation occurs due to-
Ans. Over-charging at high rate
Q. In a lead battery, excessive formation of lead sulfate occurs due to-
Ans. Idleness of battery for a long time
Q. Condition of a fully charged lead acid battery cannot be ascertained by-
Ans. Color of the electrolyte
Q. Emf of a land acid battery-
Ans. Increases with the increases in specific gravity of the electrolyte
Q. If the specific gravity of the electrolyte in a lead acid cell increases beyond 1.23 there will be-
Ans. Increases in internal resistance
Q. Capacity of a lead acid battery does not depend upon-
Ans. Charge rate.
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