Question # 1

The index of refraction depends on:

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The focal length

The speed of light

The image distance

The object distance

The more negative potential of grid, the more electrons will be:

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Attracted

Repelled

Attracted as well as repelled

Neither attracted nor repelled

If we double both the current and the voltage in a circuit while keeping its resistance constant, the power.

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remains unchanged

halves

doubles

four time

A converging mirror with a radius of 20cm creates a real image 30 cm from the mirror. What is the object distance:

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5.0 cm

7.5 cm

15 cm

20 cm

The ampere is a unit of:

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Energy

Potential differrence

Electric potential

Electric current

Resistance of conductor is directly proportional to:

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Length

Pressure

Area

All of these

The S.I unit of electric power is:

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Volt

Watt

Ampere

Joule

What is the voltage across a 6Ω resistor when 3 A of current passes through it?

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2 V

9 V

18 V

36 V

Which instrument measures the potential difference:

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Voltmeter

Barometer

Galvanometer

Ammeter

In mathematical form of Ohm's law, "R" is:

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Resistance

Specific resistance

Resistor

Resistivity

According to Ohm's law V =________

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I²R

IR²

IR

I/R

Electric current in conductors is due to the flow of:

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Positive ions

Negative ions

Positive charge

Free electrons

An electric current in conductors is due to the flow of:

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Positive ions

Negtive ions

Positive charge

free electron

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10th Class Physics Chapter 14 Current Electricity English Medium KPK Boards Online Mcqs MCQs With Answers

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