Question # 1

The length of piano wire is 1 m and mass is 20 g and it is stretched by a fore of 200 N the fundamental frequency of sound waves produced by the piano will be

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50 Hz

100 Hz

150 HZ

250 Hz

An Electric kettle should always be fitted with an earth connection as a protective device What is being protected by the earth connection.

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The cable connecting the kettle

The fuse in the circuit

The heating element of the kettle

The person using the kettle

Who proposed that light energy travels in space by means of wave motion.

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Maxwell

Planck

De-Broglie

Huygen

Negative feedback

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Increases stability

Decreases stability

Produces oscillatory

Cannot occur

The direction of electric field line surround the test charge -q id

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Parallel

Perpendicular

Radially outward

Radially inward

The unit generally used for measuring astronomical distances is.

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Parsecs

Light year

Metre

Kilometer

In potential for the material of cathode pure metals are rarely used because of their

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Low reflecting power

High reflecting power

Low resolving power

High resolving power

Which electrical component uses a low current circuit to switch a high current ON or OFF.

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Capacitor

Diode

Reed rely

Thermistor

In an electronic transition atom cannot emit

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Gama rays

Visible rays

Infrared rays

Ultraviolet rays

The source of magnetic field are

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Isolated magnetic poles

Electric charge distributions

Current loops

Solenoids

When a perfect gas is supposed to expand freely in an isolated vessel the gas has undergone.

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An increase in pressure

An increase in temperature

A change in phase

A change in entropy

A monochromatic light beam when passed through a prism is.

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Diffracted

Devlated

Polarized

Dispersed

The velocity of the wave could be increased by

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Reducing the amplitude

Decreasing the frequency

Increasing the period

Stretching the spring more

Deuterium is

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A transuranic element

A type o cosmic particle

An isotope of hydrogen

An isotope of helium

Which one of the following spectra series is in the ultraviolet region.

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Lyman series

Paschen series

Brackett series

Plund series

Which of the following colours of light passes through glass with minimum speed.

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Green

Yellow

Red

Violet

Which of the following propagates at the same speed as velocity of light.

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Heat waves

Sound waves

Shock waves

Beta particles

When an unbalanced external force acts on a body for a short interval of time.

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The body will experience an impulse.

The momentum of the body increases

The velocity of the body increase

The body is not effected

The surface of a liquid is somewhat similar to a stretched membrane because.

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There is an elastic stress in the surface

Tension in the surface increases if the area is increased

The surface has a natural tendency to contract

Ripples can be produced on the surface

Which statement is true about the Magnetic poles.

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Unlike poles repel

Like poles attract

Magnetic poles do not effect each other

A single magnetic pole does not exist

Prince Louis and Vector de broglie received the Nobel prize in.

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1919

1923

1927

1929

Which one of the following is not true.

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velocity can be negative

velocity is a vector

Speed is a sccalar

Speed can be negative

A Carnot engine has the same efficiency between (i) 100 K and 500 K and ii) T and 900 K What will be T.

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90 K

100 K

180 K

200 K

What will be the sound speed if the frequency is doubled.

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zero

Half

Double

Unchanged

Any transparent medium bounded by one or two spherical surfaces is called

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Prism

Lens

Plane mirror

Grating

The value of principal quantum number for an ionized atom is.

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13.6 eV

27.2 eV

54.4 eV

100 eV

Current in an electrolyte is carried by.

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Electron only

Anions only

Citations only

Mesons only

An example of forced oscillation is

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the pendulum of a clock

The wind screen wiper

A plucked sonometer wire

A sonometer wire excited by a tuning fork

The distance between any two consecutive bright or dark fringes is called.

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Wavelength

Amplitude

Fringe spacing

Wavelet

When a balloon sticks to the whiteboard It is an example of.

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Conoduction

Induction

Polarization

Conservation of charge

Solar cells are thin sand whishes of

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good conductors

Bad conductors

Semi conductor

Insulators

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