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MCQ
6981. What type of material is Silicon (Si)?
Conductor
Semiconductor
Insulator
Good conductor
6982. Energy consumption of a 100-watt bulb for ten hours is
1000kWh
1 unit
100kWh
1kW
6983. Resistance depends on:
Cross section
Length
Material
All
6984. Which of the following quantites consist of unit as WATT?
force
charge
current
power
ব্যাখ্যা: The St unit of power is the watt and it is discover by the Scottish Engineer James Watt. Power is the rate of consumption of electric energy. So, it is equivalent joules per second.
6985. What a battery is?
Current source
Power source
Voltage sourcs
None
ব্যাখ্যা: A battery is a device that stores electric power in the form of chemical energy. When necessary the energy a again released as electric power for DC consumers such as lighting and starter motors.
6986. The unit of resistivity is-
Ohms
Ohm/Sqm
Ohm-m
None
6987. An electric heater is marked 2000W, 200V; the resistance of the coil is--Ω
0.1
20
1/20
200
6988. The resistivity depends upon-
area
material
length
All of these
6989. The resistivity of the conductor depends on-
area of the conductor
length of the conductor
type of material
none
ব্যাখ্যা: Resistivity depends upon nature of material and physical conditions.
6990. What voltage drop will be there across a 1kW flood light whose resistance when hot is 40 Ω ?
100V
50V
150V
200V
6991. Which one is a semiconductor material?
Phosphorous
Silicon
Rubber
Aluminium
6992. Resistance of a conductor of diameter and length L is R ohm. It the diameter of the conductor is halved and its length is doubled the resistance will be-.
2R ohm
4R ohm
8R ohm
3R ohm
6993. Unit of electrical energy is:
Newton-meter
Watt-sec
Watt
BTU
6994. What type of material rubber is?
Conductor
Insulator
Semiconductor
Good conductor
ব্যাখ্যা: An insulator is a material that does not conduc electrical current. Insulating materials include-paper plastic, rubber, glass and air.
6995. 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
6996. Which quantity consists of a unit 1 kWh?
energy
power
time
charge
ব্যাখ্যা: 1 kWh is the amount of energy used by a 1 kW (1000 watt) resistance for 1 hour. Energy = Power x Time
6997. Semiconductor-এর temperature coefficient of resistance--
Negative
Zero
Positive
কোনোটিই নয়
ব্যাখ্যা: Semiconductor-এর temperature coefficient of resistance Negative
6998. How many 60-watt bulbs will be safe for a home with main meter of 6 amp and 220 volts?
6
10
11
22
6999. 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.
7000. What is the resistance-power of an electric iron with 220V and 1100 watt?
11 Ω
33 Ω
22 Ω
44 Ω