Question # 1

The half life of a radioactive element depends upon.

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Temperature

pressure

nature of element

quantity of the element

Which of the following is not a unit of plane angle.

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Degree

Radian

Gradian

Steradian

What is the minimum number of thermodynamic parameters required to specify the state of gas system.

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1

2

3

Infinite

A wave source of frequency 1000 Hz emits waves of wavelength 0.1 m How long does is take for the waves to travel 2500 m.

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20 s

25 s

40 s

100 s

Magnetic fields do not interact with

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Stationary electric charges

Stationary permanent magnets

Moving electric charges

Moving permanent magnets

The SI unit of absorbed dose in.

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Bel

Weber

Rem

Grey

Which is not the strongest and the most familiar type of magnetism.

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Diamagnetism

Para magnetism

Ferromagnetism

All of these

The gravitational force between two bodies does not depends upon.

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The product of their masses

Their separation

The sum of their masses

The constant of gravitation

Wave length of a LASER can be sued as a standard of.

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Angle

Time

Length

Temperature

If the wave length of a wire is 1 cm and its period is 0.02 s, the velocity of the wave will be

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20 cm s-1

50 cm s-1

60 cm s-1

100 cm s-1

Which of the following is not an application of diodes.

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A filters

Bridge rectifier

Half wave rectifier

Full wave rectifier

A new class of ceramics materials was discovered in.

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1938

1958

1978

1986

The phase angle between the voltage and current is A.C. circuit though a resistor is.

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0 ^o

45 ^o

90 ^o

180 ^o

Which is the fundamental quantity in electrostatic.

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Electric charge

Electric potential

Electric field

Electric field intensity

linear magnification is the ratio between the

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Distances of object and image from mirror

Distances of object and image from the focal point

Distance of image and object from the mirror

Distance of image from object and the distance of object from mirror

Which of the following thermometers is the most suitable for measuring rapidly varying temperature.

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Thermocouple thermometer

Mercury in glass thermometer

Alcohol in glass thermometer

Platinum resistance thermometer

When a wire moves perpendicularly to a magnetic field, the induced emf does ot depends upon

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The velocity of the wire

The resistance of the wire

The flux density of the magnetic

The orientation of the wire field

Electrical energy is transmitted at high alternating voltages which of the following is not a valid reason for doing this.

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At high voltage a.c is safer than d.c.

For a given powers, there is lower current with higher voltage.

There is a smaller energy loss at high voltage and lower current

The transmission lines can be thinner with a lower current.

What will be the effect on the speed of a Transerv wave in a string. If tension is made 4 times.

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Remains the same

Increase a times

Becomes double

Becomes 3 times

A standard fixed point for calibrating a thermometer is.

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Boiling point of water

Melting point of ice

Temperature of steam

Triple point of water

The radius of first Bohr's orbit for hydrogen atom is.

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0.53 m

0.53 nm

0.053 nm

0.53 mm

The energy transported by a wave is proportional to the square of the.

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Wavelength of the wave

Period of the wave

Amplitude of the wave

Frequency of the wave

The resistance of a wire does not depend upon.

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Area of cross section of the wire

Length of the wire

Temperature of the wire

Current passing though the wire

Any frequency higher than the fundamental frequency of a sound is known as.

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Overtone

Beat

Acoustics

Shockwaves

A body is termed as perfectly elastic if.

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It can move freely

Its surface is perfectly somooth

It is not affected by an external force

It recovers the original shape when the deforming force is remover

Resonance phenomenon in a vibrating body

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May increase the amplitude

May decrease the amplitude

May not affected the amplitude

All of the above

The impedance of a pure anti resonant circuit at resonance is.

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Zero

Unity

Infinity

0.5

The SI unit of coefficient of viscosity of

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kg m s-1

kg m-1 s-1

kg ms -2

When a person holding a pall is moving in the forward direction, the work done on the pall is

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Positive

Negative

Zero

Equal to gravity

A terrestrial telescope produces

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An react and real image

An inverted and real image

An inverted and virtual image

An erect and virtual image

Which quantity has dimensions different from the others.

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Energy per unit volume

Force per unit area

Angular momentum per unit mass

Pressure

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