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Physics 10 Chapter 14 - Current and Electricity - 15
1.
In order to measure potential difference across a resistance, which device is connected with the resistance?
a) Voltmeter
b) Galvanometer
c) Ammeter
d) Ohmmeter
2.
If we put V = 1 V, and I = 1 A, then what will be the value of R?
a) R = ½ Ω
b) R = 1 Ω
c) R = 0.5 Ω
d) R = ¼ Ω
3.
When a potential difference of one volt is applied across the ends of a conductor and one ampere of current passes through it, then what will be its resistance?
a) Resistance = 0.5 Ω
b) Resistance = 1 Ω
c) Resistance = ¼ Ω
d) Resistance = ½ Ω
4.
Reading on voltmeter connected across a heating element is 60 V. The amount of current passing through the heating element measured by an ammeter is 2 A. What is the resistance of the heating coil of the element?
a) R = 1/30 Ω
b) R = 120 Ω
c) R = 1/120 Ω
d) R = 30 Ω
5.
What are the materials called that obey ohm’s law and hence have a constant resistance over a wide range of voltages?
a) Ohmic materials
b) Voltaic pile
c) Non-ohmic materials
d) Non-metals
6.
What are the materials called having resistance that changes with voltage or current?
a) Voltaic pile
b) Non-ohmic materials
c) Non-metals
d) Ohmic materials
7.
What is thermister?
a) Current dependent resistor
b) Temperature dependent resistor
c) Resistance dependent resistor
d) Voltage dependent resistor
8.
Which relation is correct about thermister and temperature?
a) Resistance of thermister decreases as temperature increases
b) Resistance of thermister increases as temperature increases
c) Resistance of thermister decreases as temperature decreases
d) Resistance of thermister increases as temperature decreases
9.
Which of the following is the example of ohmic materials?
a) Non-metals
b) Filament of bulb
c) Metals
d) Thermister
10.
Which of the following are the examples of non-ohmic materials?
a) (b) Filament of bulb
b) (d) Metals
c) (c) Thermister
d) (a) Both b and c
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