Question # 1

A digital system deals with quantities or variables which have

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only one state

only two discrete states

three discrete states

four discrete states

The value of E₀in coulomb's law is:

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9 x 10⁹Nm²C^-2

8.85 x 10^-12C²N^-1m^-2

8.85 x 10^-12Nm²C^-2

9 x 10⁹C²N^-1m^-2

If a molecule with momentum mv strikes a wall and rebound then the change in momentum will be:

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-2 mv

Zero

2 mv

mv

Resistor is a device which convert electric energy to

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Heat energy

Chemical energy

Elastic energy

All of the above

de-Broglies hypthesis was experimentally verified by

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Maxwell

Compton

Einstein

Davison and Germer

Data transmitted along glass-fiber cables is in the form of pulses of monochromatic red light each of duration 2.5 ns. Which of the following is the best estimate of the number of wavelength in each pulse?

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10³

10⁶

10⁹

10¹²

Density is defined as:

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Mass per volume

Volume per mass

Mass x volume

Mass per length

Work done in lower and bucket into the well is:

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Zero

Positive

Negative

None of these

An eV is unit of:

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Potential

Energy

Work

Power

Both (B) and(C)

If a force of 0.05 N produces an elongation of 20 mm in string, then its spring constant will be:

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250 N m^-1

25 N m^-1

2.5 N m^-1

None of these

The Einstein's changes in length, mass and time are not observed in common life because

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We dont observer then seriously

The masses are too large

Their speed is too small than the speed of right

All of the above

When the second condition for equilibrium, is satisfied then there is no

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Linear acceleration

Angular acceleration

Both

None of these

The approximate efficiency of Nuclear reactor

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33%

32%

39%

45%

Fire optics has ability to transmit

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Thousand telephone conversation

Several television programs

Numerous data signals between stations

All of these

In reversible process there is a reversed change in

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Working substance

Thermal

Mechanical

B and C

The ‘emf ’ is always even when no current is drawn through the battery of the cell:

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Zero

Present

Absent

Maximum

A frame of reference stationed on Earth in approximately an example of

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Inertial frame

Non-inertial frame

Every frame

None of these

SI unit of water equivalent of electrons is

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Kg

Kg²

Kg³

Kg¹

A spinning cricket ball suffers

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An extra height

An extra velocity

An extra curvature

None of these

If the mass and radius of a planet are doubled, then acceleration due to gravity on its surface will become

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One fourth

One half

Double

Four times

The speed of swimming of porpoise is

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5 ms^-1

6 ms^-1

8 ms^-1

9 ms^-1

When the lift is falling freely under gravity, then

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T = W - mg

T - W = ma

T = 0

None of these

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