Question # 1

The motion in which the friction reduces the mechanical energy of the system as times passes and the amplitude of motion reduces is called:

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SHM

Randum motion

Damped motion

None of these

The turn ratios of a transformer is 10. It means.

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I_s = 10I_p

N_s = N_p

N_s = 10 N_p

V_s =V_p /10

The half life of radium - 226 is 1620 years. If N is its total amount then after the four half lives, its left amount will be:

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1/2 N

1/4 N

1/8 N

1/16 N

In A.C. generator flux will be zero if coil is to the field.

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90^o

45^o

Parallel

Inclined

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

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Electromagnetic waves

Sound waves

bothe a and b

Transverse waves

The oscillations of a system in the presence of which force are called damp oscillations:

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Resistive force

Attractive force

Coulomb force

Both a and b

The distance between principal focus and pole of mirror is called:

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Principal focus

Focal length

Aperture

Image

in a dry cell, chemical energy changes into:

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mechanical energy

electrical energy

potential energy

kinetic energy

Capacitors are used to store:

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Current

Voltage

Charge

Resistance

To get a design on the computer screen by moving a pointer with the help of mouse is called:

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word processing

graphic designing

data managing

telecommunication

A.C generator works on the principle of:

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Electrostatic induction

Electromagnetic induction

Law of gravitation

Third law of motion

The coil of a transformer which is connected to A.C is called:

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Primary coil

Secondary coil

Field coil

Armature coil

If one of the resistors in a parallel circuit is removed, the total resistance will be:

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Doubled

Decreased

Increased

Remain same

The A.C used in Pakistan has frequency:

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60 Hz

30 Hz

50 Hz

130 Hz

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