Question # 1

In 1950, physicists observed that in cathode ray tube a special type of rays produced from cathode, these rays were called:

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Cathode rays

X-rays

Alpha rays

Gamma rays

Which of the following quantities is not change during refraction of light?

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Its direction

Its speed

its frequency

Its wavelength

The S.I unit of electric potential is:

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Watt

Joule

Coulomb

Volt

The unit of (ρ) in formula R=ρ.L/a is______________.

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Ω

Ω-m

Ω-m²

Ω-m^-2

Wave equation is defined as:

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f = Tλ

f = V λ

V = 2fλ

V = fλ

study of charges at rest is called:

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acoustics

electrostatics

electronics

electricity

Ripple tank is an instrument which is used to study the characteristics of:

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Mechanical waves

Light waves

Radio waves

Electro-magnet waves

Public address system is the example of :

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Analogue electronics

Digital electonics

Binary system

None of these

What is the amount of current passing through an electric heater, if it takes 1800C charge pass through it in 3 minute:

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16 A

10 A

100 A

0.1 A

A positive electric charge:

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Attracts other positive charge

Repels other positive charge

Attracts a neutral charge

Repels a neutral chage

The index of refraction depends on:

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The focal length

The speed of light

the image distance

The object distance

The intensity of lawn mover is:

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10^-1 wm^-2

10^-2wm^-2

10^-1wm^-3

10^-3wm^-2

In C.R.O grid is always connected with potential:

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Negative

Positive

High positive

Zero positive

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