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1.0.0
MCQ
2281. An electric heater is marked 2000W, 200V; the resistance of the coil is--Ω
0.1
20
1/20
200
2282. Semiconductor-এর temperature coefficient of resistance--
Negative
Zero
Positive
কোনোটিই নয়
ব্যাখ্যা: Semiconductor-এর temperature coefficient of resistance Negative
2283. বাইনারি সংখ্যা 01100111-এর 2's কমপ্লিমেন্ট কত?
110001
01100001
10011001
10010010
10011000 +1 = 10011001
2284. Resistance depends on:
Cross section
Length
Material
All
2285. Unit of magnetic flux density-
tesla
lux
weber
henry
ব্যাখ্যা: Magnetic Flux density has the dimension mas per time squared electric current. The St derived unit of magnetic flux density is the tesla.
2286. The unit of resistivity is-
Ohms
Ohm/Sqm
Ohm-m
None
2287. What type of material is Silicon (Si)?
Conductor
Semiconductor
Insulator
Good conductor
2288. Unit of electrical energy is:
Newton-meter
Watt-sec
Watt
BTU
2289. Energy consumption of a 100-watt bulb for ten hours is
1000kWh
1 unit
100kWh
1kW
2290. Which one is a semiconductor material?
Phosphorous
Silicon
Rubber
Aluminium
2291. The resistivity depends upon-
area
material
length
All of these
2292. একটি AND গেইটের ক্ষেত্রে কোনটি প্রযোজ্য?
সবগুলো ইনপুট LOW হলে আউটপুট HIGH হবে
সবগুলো ইনপুট HIGH হলে আউটপুট HIGH হবে
সবগুলো ইনপুট HIGH হলে আউটপুট LOW হবে
কোনোটিই নয়
2293. SI unit of electrical capacitance--
ohm
farad
henry
coulomb
2294. What voltage drop will be there across a 1kW flood light whose resistance when hot is 40 Ω ?
100V
50V
150V
200V
2295. The basic unit of electric charge is-
Ampere-hour
Joule
Coulomb
Newton
2296. What is the resistance-power of an electric iron with 220V and 1100 watt?
11 Ω
33 Ω
22 Ω
44 Ω
2297. How many 60-watt bulbs will be safe for a home with main meter of 6 amp and 220 volts?
6
10
11
22
2298. তথ্যে বা সংখ্যায় ভুল নির্ণয় করার জন্য কোন কোড ব্যবহৃত হয়?
বাইনারি কোড
BCD কোড
Hamming কোড
Excess-3 কোড
Hamming code is a set of error-correction codes that can be used to detect and correct the errors that can occur when the data is moved or stored from the sender the receiver. It is technique developed by R.W. Hamming for error correction.
2299. The minimum dielectric stress in a cable is at-
conductor
surface centre of conductor
lead sheath
none of the above
ব্যাখ্যা: Equation of Resistivity of a wire is- So, resistivity of wire is directly proportional to cross section area (A) and inversly proportional to length (L) of wire.
2300. 1 coulomb is equal to?
6.24 x 10^18 electron-charge
6.28 x 10^16 electron charge
682 x 10^18 electron charge
6.82 x 10^-18 electron change