Question # 1

The dot product of electric field intensity E and vector area A is called

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Electric potential

Electric flux

Electric field

Magnetic field

Which of the following material has smaller has life

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uranium

polonium

radium

radian

The unit of flux density is also given by

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Weber/m²or Wb . m^-2

Weber/mor Wb . m

Weber/mor Wb . m^-1

Weber or Wb

Centripetal acceleration is also called ________ acceleration

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Tangential

Radial

Angular

None of these

An induced current can be produced by:

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Constant magnetic field

Changing magnetic field

Varying magnetic field

Constant electric field

None of these

A body is executing free vibrations when it oscilates

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with the interference of an external force

without the interference of an external force

with the interference of an internal force

none of them

The waves which propagate through the oscillations of material particles are known as:

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Mechanical waves

Electromagnetic waves

Any of them

None of them

If a simple pendulum is shifted from karachi to K-2 cliff, its time period

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remains the same

decreases

increases

none of them

If both the inputs given to a gate ae 1 such that the output is 0, then it is:

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AND gate

NOR gate

OR gate

NOT gate

Both (A) and (C)

Tick the correct pair when M denotes the molecular mass and other symbols carry usual meanings:

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N = nN_Am = MN_A

n = N N_A, M = mN_A

M = N_A/N , N_A= m/n

N = nN_A, M = mN_A

A mass of 5kg moves with an acceleration of 10m s^-2force applied is

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10N

50N

2N

20N

A boat of mass 40 kg os at rest.A dog of mass 4 kg moves in the boat with a velocity of 10 m/s.What is the velocity of boat?

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4 m/s

2 m/s

8 m/s

1 m/s

The electrons, which can wander in the solid, are known as:

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Valence electron

Free electron

Loosely bound electrons

None of these

Which of the following spectrum have all the frequencies from high to low frequency range?

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Band spectrum

Continuous spectrum

Line spectrum

Discontinuous spectrum

The band above the valence band is called

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high energy band

conduction band

empty band

none of them

How many the multiplications of vectors are ?

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Three

Two

One

None of these

Two forces of 4 dyne and 3 dyne act upon a body.The resultant force on the body can only be

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Between 3 and 4 dyne

Between 1 and 7 dyne

More than 3 dyne

More than 4 dyne

Which of the following types of optical fibre has a very thin core of about 5μm diameter and has a relatively large cladding?

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single mode step index fibre

multi-mode step index fibre

multi-mode graded index fibre

none of them

Diamagnetic substances are those in which

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Spin and orbital motions are supported

Spin and orbital motions are opposed

Resultant of spin and orbital motion is zero

None of these

Which of the fluid has ideal behavior at low speeds

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Air

Blood

Honey

None of these

Newton's third law says, that the action and reactions are

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Equal but in the same direction

Equal but in opposite direction

May be unequal but in the same direction

May be unequal but in opposite direction

The motion in a plane is the motion in

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one dimensions

two dimensional

three dimensional

all of them

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