Question # 1

An object is placed 6 cm away in front of a concave mirror that has 10 cm focal length. Determine the location of the image:

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-5 cm

-10 cm

-15 cm

-20 cm

Optical fibres works on the principle of:

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Reflection

Refraction

Total internal reflection

Diffraction

Image formed on a camera is:

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real,invertred, and diminished

virtual, upright and diminshed

virtual, upright and magnified

real, inverted and magnified

The digits used in electronics are:

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1

0

0 and 1

1 and 2

When we double the voltage in a simple electric circuit, we double the:

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Current

Power

Resistance

Both a and b

The loudness of a sound is most closely related to its:

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Frequency

Period

Wavelength

Amplitude

The number of neutrons in the nucleus of tritium is:

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1

2

3

4

Joule's law is W = ____________________

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IR/t

IRt²

IR²t

I²Rt

Who discovered the phenomenon of natural radioactivity?

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Henry Becurial

Merry Curi

Perry

Rutherford

In totally reflecting prism one angle is of:

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45°

90°

180°

120°

Which of the following is an insulator:

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Copper

Iron

Silk

Silver

Electric current in conductors is due to the flow of:

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Positive ions

Negative ions

Positive charge

Free electrons

One byte is equal to:

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7 bits

5 bits

8 bits

9 bits

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