Questions
At which condition metals have super-conductivity properties?
- At a very low temperature
- Below critical temperature
- At triple point
- Under the conditions of high temperature
- Under the conditions of high pressure
Which of the following is the application of Voltage Dependent Resistors?
- Overvoltage protection crowbar for power supplies.
- To prevent massive power fluctuations.
- To suppress surges.
- Better cuts on metals and the welding of dissimilar metals without the use of a flux.
- Series resistors or current-regulated power supplies.
Wheatstone bridge is a circuit used for determining the unknown _____________.
- inductance
- resistance
- voltage
- capacitance
- frequency
The SI unit of temperature co-efficient of resistance is ____________.
- per kelvin
- ohm-meters
- ohm
- ampere
- volt
In which of the following, the resistance decreases with an increase in temperature?
- PTC thermistors
- NTC thermistors
- LDR
- LED
- LASCR
A light dependent resistor is known as ___________.
- photoresistor
- ceramic resistor
- fixed resistor
- carbon resistors
- trimmer resistor
The properties of a fuse wire is/are ________.
- low resistivity
- high melting point
- low melting point and low resistivity
- high resistivity and low melting point
- low resistivity and high melting point
Ohm's law represents the graph as
- parabolic
- linear
- hyperbolic
- sine
- cosine
The electromagnetic circuit breaker phenomenon is related to which device?
- Fuse
- Toggle switch
- Resistor
- Relay
- Inductor
Positive electrode is called ____________.
- anode
- cathode
- anode rays
- cathode rays
- auxiliary electrode
If a circuit containing two unequal resistors is connected in parallel then _____________.
- the voltage is same across both the resistors
- the current is same and voltage is different in the resistance having more value
- the current is same in both resistors
- the current is flow less in both resistors
- the voltage drops are different across both the resistors
What is the current in the resistor if the color code is red, orange, orange, silver if the resistor is connected across a 40 V source?
- 1.74 mA
- 1.21 mA
- 1.18 mA
- 0.1162 A
- 57.5 A
Calculate the voltage source for a circuit carrying 2 A of current through a 34 ohm resistor?
- 68 v
- 0.058 v
- 17 v
- 5.8 m v
- 0.029 v
What is the approximate resistance setting of a rheostat in which 750 mA of current flows with a 150 V source?
- 5 m ohm
- 5 Kohm
- 2 ohm
- 200 ohm
- 0.002 ohm
Calculate the resistance of the bulb if the current through bulb is 30 mA and the total battery voltage is 4.5 V?
- 150 ohm
- 0.15 ohm
- 6.66 m ohm
- 6.66 ohm
- 666 ohm