CURRENT ELECTRICITY PART 10

CURRENT ELECTRICITY PART 10

91. Bulbs in street lightning all are  connected in

A  parallel 

B.series

C. series parallel 

D.end to end

92. For testing  appliances the wattage of test lamp should be 

A very low

B. low

C.high

D. any value

93. switching of a lamp in house reduces 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

94. sparking occurs when a load is switched off because the circuit has high 

A.  resistance 

B.  inductance

C.  capacitance 

D. impedance

95. copper wire of certain  length and resistance is drawn out  three times its length without change in volume the new resistance of wire becomes

A. 1/9 times

B.3 times

C. 9times

D. Unchanged

96. when resistance element of a heater fuses and then we reconnect it after removing a person of it the power off the heater will

A.  decrease 

B. Increase

C.  remains constant 

D.none of the above

97.  A  field of force can exist  only between 

A. two molecules 

B. Two ions 

C. two atoms

D. Two metal particles

98. 1 micro volt is 

A.1 ×10^-4 V

B.1 ×10^-5 V

C. 1×,10^-3 V

D. 1 ×10^-6 V

99. 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

100. which of the following could be the value of resistivity of copper A. A. 1.72 x 10 to the power minus 4 ohm metre 

B. 1.72 into 10 to the power minus 5 ohm meter

C.  1.72 into 10 to the power minus 6 ohm meter

D. 1.72 into 10 to the power minus 8 ohm metre

ANSWERS:- 91. A ,92.C,  93.A, 94. B,  95.C,  96.B,  97.B, 98 D 99.A  100.D

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