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A 40 W bulb is connected in series with a room heater. If now 40 W bulb is replaced by W bulb, the heater output will a decrease b increase c remain same d heater will burn out Ans: b In an electric kettle water boils in 10 m minutes.

It is required to boil the boiler in 15 minutes, using same supply mains a length of heating element should be decreased b length of heating element should be increased c length of heating element has no effect on heating if water d none of the above Ans: a An electric filament bulb can be worked from a D. Resistance of a tungsten lamp as applied voltage increases a decreases b increases c remains same d none of the above Ans: b Electric current passing through the circuit produces a magnetic effect b luminous effect c thermal effect d chemical effect e all above effects Ans: c I am Bilal Nasir Certified Engineer under Washington Accord Address: Islamabad Pakistan Resistance of a material always decreases if a temperature of material is decreased 6 temperature of material is increased c number of free electrons available become more d none of the above is correct Ans: c If the efficiency of a machine is to be high, what should be low?

When electric current passes through a metallic conductor, its temperature rises.

This is due to a collisions between conduction electrons and atoms b the release of conduction electrons from parent atoms c mutual collisions between metal atoms d mutual collisions between conducting electrons Ans: a Two bulbs of W and W rated at V will have resistance ratio as a 4 : 25 b 25 : 4 c 2 : 5 d 5 : 2 Ans: c A glass rod when rubbed with silk cloth is charged because a it takes in proton b its atoms are removed c it gives away electrons d it gives away positive charge Ans: c Whether circuit may be AC.

It becomes more difficult to remove I am Bilal Nasir Certified Engineer under Washington Accord Address: Islamabad Pakistan a any electron from the orbit 6 first electron from the orbit c second electron from the orbit d third electron from the orbit Ans: d When one leg of parallel circuit is opened out the total current will a reduce b increase c decrease d become zero Ans: c In a lamp load when more than one lamp are switched on the total resistance of the load a increases b decreases c remains same d none of the above Ans: b Two lamps W and 40 W are connected in series across V alternating.

Which of the following statement is correct? Resistance of V, W lamp will be a 4.

In the case of direct current a magnitude and direction of current remains constant b magnitude and direction of current changes with time c magnitude of current changes with time d magnitude of current remains constant Ans: a When electric current passes through a bucket full of water, lot of bubbling is observed. This suggests that the type of supply is a A.

Resistance of carbon filament lamp as the applied voltage increases. Bulbs in street lighting are all connected in a parallel b series c series-parallel d end-to-end Ans: a For testing appliances, the wattage of test lamp should be a very low b low c high d any value Ans: c Switching of a lamp in house produces noise in the radio.

This is because switching operation produces a arcs across separating contacts b mechanical noise of high intensity c both mechanical noise and arc between contacts d none of the above Ans: a Sparking occurs when a load is switched off because the circuit has high a resistance b inductance c capacitance d impedance Ans: b When resistance element of a heater fuses and then we reconnect it after removing a portion of it, the power of the heater will a decrease b increase c remain constant d none of the above Ans: b A field of force can exist only between a two molecules b two ions c two atoms d two metal particles Ans: b A substance whose molecules consist of dissimilar atoms is called a semi-conductor b super-conducto c compound d insulator Ans: c International ohm is defined in terms of the resistance of a a column of mercury b a cube of carbon c a cube of copper d the unit length of wire Ans: a Three identical resistors are first connected in parallel and then in series.

Which method can be used for absolute measurement of resistances?

Three 6 ohm resistors are connected to form a triangle. What is the resistance between any two corners? Ohm's law is not applicable to a semi- conductors b D.

Two copper conductors have equal length. The cross-sectional area of one conductor is four times that of the other.

If the conductor having smaller cross- sectional area has a resistance of 40 ohms the resistance of other conductor will be a ohms b 80 ohms c 20 ohms d 10 ohms Ans: d For a heater of 1 kW at V, the length of wire required will be a 80 m b 60 m c 40 m d 20 m Ans: a Which of the following materials has the least resistivity?

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Dronacharya College Of Engineering. The concept on which Superposition theorem is based is a reciprocity b duality c non- linearity d linearity Ans: d 7.

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