Question # 1

The SI unit of coefficient of viscosity of

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kg m s-1

kg m-1 s-1

kg ms -2

Solids have

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Fixed shape only

Fixed volume only

Fixed shape and volume

No fixed shape and volume

When a platinum wire is heated of 1600^oC, it becomes

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orange

Cherry red

Dull red

White

In rotational motion, the analogue of force is.

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moment of inertia

Moment of force

Torque

Rotational inertia

If you float in water with just your nose out the average density of your body must be

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Same as that of water

Greater than that of water

Less than that of water

Zero

Inserting a di electric between the plates of a charged parallel plate capacitor.

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Decrease the capacitance

Leaves teh capacitance the same

Encourages breakdown between the plates

Reduces the electric intensity between the plates

Which parameter determines the brightness of a light source sensed by an eye.

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Light energy entering the eye

Wavelength of light

Total radiant flux entering the eye

Total luminous flux entering the eye

From which radiation it is most difficult to protect oneslelf.

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Alpha radiation

Beta radiation

Gama radiation

Heat radiation

Why is a capacitor resistor combination used in oscillators in grid circuit.

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To generate oscillation

To bias the grid automatically

To amplify oscillations

To sustain the oscillations.

In an oscillating system damping means reduction in

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Frequency

Wavelength

Amplitude

Period

The velocity at which laminar flow changes to turbulent flow is called.

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Terminal velocity

Escape velocity

Critical velocity

Uniform velocity

What is a thermal properly of a material that determines the quantity of energy required to change the phase of a unit mass of that substance.

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Specific heat

Latent heat

Internal energy

Specific energy

If the average velocity of an object zero in some time interval, the displacement of the object for that interval will be.

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Infinite

Zero

Increasing

Decreasing

Beats are the result of.

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Interference

Doppler's effect

Ultrasound

Polarization

The resistance of 10 micro F capacitance, when connected to A D.C. circuit is.

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Zero

Unity

-1

Infinity

X-rays are a part of electromagnetic spectrum and are characterized by frequencies higher that those of.

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Infrared radiation

Ultraviolet radiation

Far ultraviolet radiation

Far infrared radiation

A thin layer of oil the surface of water looks coloured due to.

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Pillarization of light

Different elements present in the oil

Interference of light

Transmission of light

A charge kept at the centre of a shell The shell has charge Q and radius R The force on the central charge due to shell is

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in the upward direction

Towards left

Towards right

Zero

Waves transfer

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Frequency

Velocity

Energy

Wavelength

Longitudinal waves cannot be

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Reflected

Difracted

Dispersed

Polarized

The venturimeter is an instrument used for measuring the

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Viscosity of a liquid

Flow speed of a liquid

Compressibility of a fluid

Specific gravity of a liquid

The first book of physics was written by

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Maxwell

Newton

Aristotle

Faraday

The ratio of average induced emf to the rate of changing of current in the coil is called.

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Self induction

Mutual induction

Self inductance

Mutual inductance

Which one of the following instruments has the maximum resistance.

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Ammeter

Voltmeter

Micro ammeter

Milli ammeter

Why is an oxide coated filament used in vacuum tube.

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It has a longer lime

Irt can with stand high

It emit electrons at low temperature

It reduces the effect of space charge

Conductance is the reciprocal of

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Inductance

Capacitance

Resistance

Admittance

The practical efficiency of a heat engine is

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25% to 30.5 %

35% to 45%

30% to 45%

15% to 25%

Distance between two consecutive nodes or antinodes is equal to.

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Lamda /4

Lamda

Lamda /2

2 lamda

Which of the following is a thermodynamic temperature scale.

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Celsius scale

Fahrenheit scale

Kelvin scale

Rankine scale

The highest efficiency of a heat engine whose low temperature is 17 oC and the high temperature of 200 oC is.

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20%

30%

35%

40%

In which of the following controlled nuclear chain reaction is used to liberate energy.

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Nuclear bomb

Atomic bomb

Hydrogen bomb

Nuclear reactor

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