Question # 1

A converging mirror with a radius of 20 cm 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 power of washing machine is:

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700 W

750 W

650 W

800 W

What happens to the intensity of the brightness of the lamps connected in series as more and more lamps are added?

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Increases

Decreases

Remains the same

Can not be predicted

The A.C. used in our houses has frequency _____ cycle/sec

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60

30

50

130

Hard disk is made of:

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Aluminium

Copper

Iron

Plastic

A digital multimeter is used to measure:

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Current

Resistance

Potential difference

All of above

In computer terminology information means:

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Any data

Raw data

Processed data

Large data

1.6x10^-19 J= :

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1F

1N

1eV

What type of graph is in between V and I?

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Curved

Parabola

Straight line

None of these

A unit of electric charge, equal to the charge of 6.25x10¹⁸ electrons is:

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Electricity

Coulomb

Electric potential

Volt

Angle opposite to the base of triangle of prism is called:

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angle of incidence

angle of refraction

angle of prism

emerging angle

The critical angle for a beam of light passing from water into air is 48.8 degrees. This mean that all light rays with an angle of incidence greater than this angle will be:

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Absorbed

Totallly reflected

Partially reflected and partially transmitted

Totally transmitted

The angle of which prism deviates the incident ray is called:

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angle of incident

angle of reflection

angle of deviation

angle of minimum deviation

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