MCQ
3821. It becomes more difficult to remove-
any electron from the orbit
first electron from the orbit
second electron from the orbit
third electron from the orbit
3822. Which is the lightest particle of an atom?
Neutron
Proton
Electron
All have same weight
3823. One Newton meter is same as-
one watt
five joules
one joule
one joule second
3824. A 15 V source is connected across a 12 resistor. How much energy is used in three minutes?
938Wh
56.25Wh A
0.938Wh
5.6Wh
3825. An electric fan and a heater are marked as 100W, 220V and 1000W, 220V respectively. The resistance of heater is-
zero
greater than that of fan
less than that of fan
equal to that of fan
3826. When resistance element of a heater fuses and then we reconnect it after removing a portion of it, the power of the heater will-
decrease
remain constant
increase
none of the above
3827. What is the unit of work?
Newton
Watt
Joule
Pascal
3828. Relative permeability of vacuum is-
4π10^-7 H/m
1H/m
1/4π
1
3829. কোনটিতে ফ্লাক্স/ফিলার মেটাল ব্যবহৃত হয়?
গ্যাস ওয়েল্ডিং
আর্ক ওয়েল্ডিং
মিগ ওয়েল্ডিং
টিগ ওয়েল্ডিং
3830. The unit of absolute permitivity of a medium is-
joule/coulomb
Newton meter
farad/meter
farad/coulomb
3831. কেনো শক্ত ধাতবের তাপমাত্রা বৃদ্ধি করলে তার পরিবাহিতা কী হবে?
কমবে
বাড়বে
সমান থাকবে
কোনোটিই নয়
3832. Out of the following which is not a poor conductor?
Cast iron
Carbon
Copper
Tungsten
3833. Which of the following materials has a negative temperature co-efficient of resistance?
Insulator
Conductor
Semiconductor
None of them
3834. A 1k, 1W resistor can safely pass a current of-
31.62mA
100mA
150 mA
500 mA
3835. A length of wire has a resistance of 6 ohms. The resistance of a wire of the same material three times as long and twice the cross sectional will be-
36 ohms
9 ohms
1 ohms
12 ohms
3836. Which of the following material has nearly zero temperature co-efficient of resistance?
Manganin
Carbon
Porcelain
Copper
3837. The number of electron in the outermost orbit of carbon atom is-
8
2
4
6
3838. The electric current is due to the flow of--
positive charges only
negative charges only
both positive and negative charges
neutral particles only
3839. How many watt-hours represent 65 W used for 18h?
11.7Wh
11,700Wh
1.170Wh
117,000Wh
3840. Ampere second could be the unit of-
Power
Energy
Conductance
Charge