Question # 1

The phase at the positive peak is

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Π/2

Π

3Π/2

2Π

Significant figures in 0.0010 are:

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Four

Three

Two

One

Electron is a particle whose mass is:

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Greater than that of a proton

Smaller than of a proton and greater than mass of neutron

Smaller than that of proton or neutron

Greater than that of an atom

When a source of light isat very large distance,the shape of wavefront is:

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Spherical

Cylindrical

Plane

None of these

During the upward motion of the projectile, the vertical component of velocity:

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Decreases

Increases

Remains constant

None of these

A metastable stae:

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Is an excited state

Is that in which excited electron is stable

Is that in which excited electron is usually unstable

Means a time interval of 10^-8second

Both (A) and (C)

With the increase of temperature viscosity

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Increase

Decrease

Remains same

Doubles

Work has a dimension as that of:

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Torque

Angular momentum

Linear momentum

Power

The value of current gain of n-p-n transistor is of the order of

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tens

hundreds

thousands

ten thousands

A sinusoidally alternating voltage or current can be graphically represented by a:

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Vector

Rotating vector

Clockwise vector

Anticlockwise voltage vector

None of these

A 100 kg car is moving at a speed of 10 m/sec and comes to rest after covering a distance of 50 m. the amount of work done against friction is:

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+5 x 10¹J

+5 x 10²J

+5 x 10³J

+5 x 10⁴J

The energy equivalent to the mass of one Kilogram is

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3 x 10⁸j

931 Mev

9 x 10¹⁶m

25 Mev

Accuracy of a measurement depends on

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Percentage uncertainty

Fractional uncertainty

Less absolutely

None of these

Large CR (Time constant) value has

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Small time constant

Large time constant

Equal time constant

None of these

If Rx is positive and Ry is negative, the resultant lies the fourth quadrant and its direction is

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θ = 180 + Φ

θ = 360 + Φ

θ = 360 - Φ

None of these

In case of destructive interference of two waves, the amplitude of the resultant wave will be_______either of the waves:

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Greater than

Smaller than

Equal to

none of these

The time constant is the time required to deposit the equilibrium charge

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63 times

36 times

0.63 times

0.36 times

Which of the following is not the unit of time

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Leap year

Lunar month

Solar day

Parallactic second

If the tensile force is suddenly removed from a wire then its temperature will

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Decrease

Increase

Becomes zero

Remain constant

The light source in the transmitter can be either

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Light emitting diode

Semiconductor laser

Light emitting in an invisible infra red

All of these

If vectors P,Q and R; have magnitude 5,12 and 13 units and P + Q = R the angle between Q and R is

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cos^-1 5/12

cos^-1 5/13

cos^-1 12/13

cos^-1 7/13

If we keep the moment arm, fixed while change the force, then, the torque is

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Changed

Does not change

Some what change

None of these

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