Question # 1

What happen to the atomic number of an element which emits one alpha particle and a beta particles.

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Increases by 1

Stay the same

Decrease by 2

Decrease by 1

The basic operations performed by a computer are:

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Arithmetic operations

Non-arithmetic operations

Logical operations

Both a and c

It is used in satellite communication:

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Radio waves

Micro waves

Light waves

Electrical waves

Power of electric heater is:

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1500W

4750W

100W

50W

The waves in which particles of the medium vibrate perpendicular to the direction of waves are:

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Electromagnetic waves

Sound waves

Both a and b

Transverse waves

the time period of body attached to spring depend on:

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mass

gravitational constant

length

amplitude

Focal length for concave mirror is :

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-ve

+ve

same

none of these

The electrostatic force acting on two charges each of 1C separated by 1m is about:

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9X10⁹ N

9X10^-9 N

9X10⁸ N

9X10^-8 N

Floppy has a storage capacity

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4-5 MB

3-4 MB

1-3 MB

3-6 MB

The index of refraction depends on:

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The focal length

The speed of light

the image distance

The object distance

After how much time the echo must be heard?

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0.1 s

0.10 s

0.20 s

0.50 s

Mathematical formula of electromotive force (e.m.f) is:

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E = W/Q

E = Q/W

E = WQ

E = W2Q

The 1st practical electric battery is known as:

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Voltaic

Pile

Voltaic pile

Voltaic cell

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