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Physics

Physics
What is the effective resistance (in Ω) of two resistors 20 Ω and 30 Ω connected in parallel?

12
24
36
50

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Physics
It is easy to burst a gas-filled balloon with a needle than with a nail. It is because

Nail exerts more pressure than needle on the balloon.
Needle exerts more pressure than nail on the balloon.
Nail is more longer than needle.
Gas is reactive with the needle.

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Physics
'Farad' is the unit of :

Resistance
Conductance
Capacitance
Inductance

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Physics
Friction can be reduced by changing from

Static to Dynamic
Rolling to Sliding
Dynamic to Static
Sliding to Rolling

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Physics
Which of the following device is best suited for measuring the temperature inside metallurgical furnaces?

Pyrometer
Thermocouple
Thermistor
Thermometer

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Physics
The metal used to make lightning conductors is

Aluminium
Zinc
Copper
Iron

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