PHY 102 Pre Test 0% 0 Created by Oladeji Timilehin Daramola PHY 102 NOTE: The quiz is meant for revision purpose only! Join the 100 level group to access other quiz CLICK TO JOIN 1 / 20 The force between two charges is 120 N. If the distance between the charges is doubled, the force will be 60 N 30 N 40 N 15 N 2 / 20 The value of E within the field due to a point charge can be found with the help of Faraday's laws Kirchhoff s laws Coulomb's laws none of the above 3 / 20 Which of the following capacitors has relatively shorter shelf life ? Mica capacitor Electrolytic capacitor Ceramic capacitor Paper capacitor 4 / 20 If an ohm meter reading immediately goes practically to zero and stays there, capacitor is charged short-circuited lossy satisfactory 5 / 20 1 volt/meter is same as 1 meter/coulomb 1 Newton meter 1 newton/meter 1 joule/coulomb 6 / 20 Fora good 0.05 uF capacitor ohmmeter reading should show low resistance momentarily and back off to a very high resistance show high resistance momentarily and then a very low Resistance go quickly to 50 ohm approximately and remain there not move at all 7 / 20 Which of the following statements is correct? Air capacitors have a black band to indicate the outside foil Electrolytic capacitor must be connected in the correct polarity Ceramic capacitors must be connected in the correct polarity Mica capacitors are available in capacitance value of 1 to 10 pF 8 / 20 The time constant and R-C circuit may also be defined as the time during which the charging current falls to ______ percent of its initial maximum value, 37 42 63 73 9 / 20 Ceramic capacitors must be connected incorrect polarity Electrolytic capacitors must be connected incorrect polarity Air capacitors have a black band to indicate the outside foil Mica capacitors are available in capacitance values of 5 to 20 uF 10 / 20 The total electric flux through any closed surface surrounding charges is equal to the amount of charge enclosed". The above statement is associated with Coulomb's square law Gauss's law Maxwell's second law 11 / 20 The capacitance C is charged through a resistance R. The time constant of the charging circuit is given by : CIR RC RIC 1/RC 12 / 20 The time constant of an R-C circuit is defined as the time during which capacitor charging voltage actually rises to ______ percent of its value. 37,initial 62,initial 62,final 37,final 13 / 20 If the sheet of a bakelite is inserted between the plates of an air capacitor,the capacitance will Decrease Increase Remains unchanged Becomes Zero 14 / 20 A capacitor having capacitance of 5 uF is charged to a potential difference of 10,000 V. The energy stored in the capacitor is 150 joules 50 joules 200 joules 250 joules 15 / 20 The electric field at a point situated at a distance d from straight charged conductor is proportional to inversely proportional to d inverse to d None of the above 16 / 20 Permittivity is expressed in Farad/sq-m Farad/meter Weber/meter Weber/sq-m 17 / 20 The lines of force due to charged particles are always straight always curved sometimes curved none of the above 18 / 20 What will happen to an insulating medium if voltage more than the breakdown voltage is applied onit ? It will become magnetic It will melt It will get punctured or cracked Its molecular structure will get changed 19 / 20 A potential of 400V is applied to a capacitor, the plates of which are 4mm apart. The strength of electric field is 10 kV/m 100 kV/m 2 kV/m 5 kV/m 20 / 20 Out of the following capacitors of identical rating which one will have the smallest dimensions ? Paper capacitor Ceramic capacitor Mica capacitor Aluminium foil capacitor Your score is LinkedIn Facebook Twitter VKontakte Restart quiz Send feedback Like this:Like Loading...
