Question # 1

It is used in satellite communication:

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Radio waves

Micro waves

Light waves

Electrical waves

Electroscope is used for detecting:

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Current

Charge

Voltage

Resistance

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

Spherical mirrors are used in:

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Medical

Search light

Microscope

All of these

Two uncharged objects a and b are rubbed against each other. When object b is placed near a negatively charged object c, the two objects repel each other. Which of these statements is true about object a:

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Remains uncharged

Becomes positively charged

Becomes negatively charged

Unpredictable

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

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Resistance

Specific resistance

Resistor

Resistivity

If X = A,B, then X is 1 when:

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A and B are 1

A or B is 0

A is 0 and B is 1

A is 1 and B is 0

Example of mechanical waves is:

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Radio waves

X-rays

Light waves

Sound waves

Optical fibers work on the principle of:

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Refraction

Reflection

Total internal reflection

Diffraction

When frequency of sound wave is increased, which of the following decreases?

i) Wavelength ii) Period iii) Amplitude

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i only

(iii) only

i and ii only

i and iii only

Waves transfer:

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Energy

Wavelength

Velocity

frequency

Information storage devices work on the principles of

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Heat

Sound

Light

Magnetism

When light passes through a prism it deviates from its original path due to:

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Reflection

Diffraction

Interference

Refraction

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