Q161
Open question18 volts = . . . . . . . . × 3 ohms
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Physics GK · all questionsElectricity and Magnetism
Electricity and Magnetism
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Q162
Open questionOf the two bulbs in a house, one glows brighter than the other. In this context which of the following statements is correct?
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Q163
Open questionAfter using for some time, big transformers get heated up. This is due to the fact that
1. current produces heat in the transformers.
2. hysteresis loss occurs in the transformers.
3. liquid used for cooling gets heated.
Select the correct answer:
1. current produces heat in the transformers.
2. hysteresis loss occurs in the transformers.
3. liquid used for cooling gets heated.
Select the correct answer:
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Q164
Open questionThe potential difference between the terminals of an electric heater is 60V when it draw of current of 4A from the source. What current will the heater draw if the potential difference is increased to 127.5 V?
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Q165
Open questionIn electrical motor
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Q166
Open questionWhich of the following devices is not based on the heating effect of electric current?
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Q167
Open questionSuperconductors are those elements
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Q168
Open questionThose wires which transmit electricity in houses having a coating of . . . . . . . .
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Q169
Open questionA closed and continuous path of electric current circuit is called?
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Q170
Open questionWhich gas is filled in normal tubelights?
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Q171
Open questionA bird sitting on a high tension electric wire does not get electrocuted, because
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Q172
Open questionThe approach called 'magnetic confmement of plasma' is the scientific principle of which technique?
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Q173
Open questionSome pairs of devices and associated energy changes are given below.
1. Electric generator ⟺ Mechanical to electrical
2. Electric motor ⟺ Electrical to mechanical
3. Diesel engine ⟺ Light to electrical
4. Solar cell ⟺ Chemical to mechanical
Which of the above pair/s is/are correctly matched?
1. Electric generator ⟺ Mechanical to electrical
2. Electric motor ⟺ Electrical to mechanical
3. Diesel engine ⟺ Light to electrical
4. Solar cell ⟺ Chemical to mechanical
Which of the above pair/s is/are correctly matched?
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Q174
Open questionWhat is the relation between Power 'P', Current 'I' and Resistance 'R'?
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Q175
Open questionThe device used for converting alternating current to direct current is called
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Q176
Open questionWhat does the diagram shows?
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Q177
Open questionThe work done in two points with a potential difference of 20V is 60 J. Then the electric charge flowing between the two points is:
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Q178
Open questionA Galvanometer can be converted into a voltmeter by connecting with it a
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Q179
Open questionAccording to Ohm's law, . . . . . . . . is a constant.
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Q180
Open questionAssertion (A) Electric appliances with metallic body have three connections, whereas on electric bulb has a two pin connection.
Reason (R) Three pin connections reduce heating of connecting wires.
Reason (R) Three pin connections reduce heating of connecting wires.
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