Question # 1

In describing function of digital systems, 1 represents:

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Closed switch

True Statement

Lighted bulb

Only (B) and (C)

All are true

Coulomb's force between two point charges depends upon

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Magnitude of charges

Distance between them

Medium in which they are located

All of the above

What is the current is a 2 x 10⁶ohm resistor having a potential difference of 2 x 10³volts?

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10^-1A

10^-2A

10^-4A

1 mA

The best conductor is:

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Silver

Copper

Aluminimum

Both B and C

None of them

Bernoulli's equation is based upon law of conversation

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Mass

Momentum

Energy

None of these

Which of the following material has smaller has life

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uranium

polonium

radium

radian

The product of cross-sectional area of the pipe and the fluid speed at any point along the pipe is called

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constant rate

volume rate

flow rate

steady rate

The body of physics involves

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Structure of space and time

Interaction of electromagnetic radiation with matter

Both of them

Chemical Changes

In the formula B= µ̻ nl, the symbol n denotes:

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Total number of turns of solenoid

Number of turns per unit length

Number of turns per unit volume

Numbers of turns per unit area

Number of moles

The unit of spring constant is

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J-sec

Metre

Nm^-1

None of these

The graph showing the variation of displacement with time is a:

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Sine curve

Straight line

Parabola

None of these

When the light waves of the same frequency and amplitude travelling in the same direction superimose each other , they give rise to

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interference

diffraction

dispersion

polarization

In thermodynamics, the internal energy is a function of

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Time

State

Temperature

None of these

If the earth suddenly stops rotating the value of 'g' at equator would:

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Decrease

Remain unchanged

Increase

Become zero

Velocity is a

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Scalar quantity

vector quantity

constant quantity

none of them

The metals become a magnetic material because of their

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Hardness

Alignment of atoms

Structure

All of them

Tick the one which is not a crystalline solid:

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Zirconia

Glass

Copper

Ceramic solid

An ionic compound

The first superconductor was discovered in

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1905

1911

19161

1920

The displacement coincides with the path of motion when a body moves along a

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Straight line

Curved path

Zig Zag path

None of these

The number of significant figures in all the given number 25.12.2009,4.156 and 1.257 x 10^-4 is

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1

2

3

4

The efficiency of half wave rectifier is:

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25.6%

1.2%

40.6%

66.6%

Newton published laws of motion in his famous book "principia" in

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1867

1667

1676

1687

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