Question # 1

Which of the following is SI base unit for temperature.

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Celsius

Kelvin

Fahrenheit

Rankine

Why hydrogen atom does not emit x-rays.

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its size is very small

It contains only single electron

In it energy levels are for apart

In it energy levels are close to each other

For maximum range angle of projection of the projectile should be

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45 ^o

90^o

120 ^o

180 ^o

The tunnel effect makes possible

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Alpha decay

Gama rays

Positive Beta decay

negative Beta dacay

The Compton effect in X-rays proves that

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Electrons have wave property

x-rays have wave properly

X-rays have particle characteristics

Electrons cannot exist

The SI unit of modulus of elasticity us

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N m-2

N m-1

N m

N m -3

Marie Curie and Pierre Curie discovered two new radioactive elements which are.

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Uranium and radkum

Platinum and radium

Polonium and radium

Crypton and radon

Work has the same dimensions as that of

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Power

Liner momentum

Angular momentum

Torque

In vacuum all electromagnetic waves have the same.

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Frequency

Amplitude

Speed

Wavelength

A device used to detect and measure charge is.

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A voltmeter

An ammeter

An electroscope

An amplifier

Two convex lens focal length 'f' use din combination become telescope. When the distance between them is.

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1

4f

2f

f/2

The minimum velocity needed to put a satellite into the orbit

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Terminal velocity

Escape velocity

Critical velocity

Linear velocity

Both xenon and cesium each have

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24 isotopes

28 isotopes

32 isotopes

36 isotopes

Who discovered a relation between electric and magnetic field.

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Hans Christian Oersted

Michelson Faraday

Lenz

Hertz

What is the degree of magnetization of a material.

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Susceptibility

Ablitity

Retentivity

Capacity

A longitudinal sinusoidal wave has a wavelength of 1 cm and a period of 2s. Its wave velocity is.

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50 cm s-1

0.00t m s-1

100 cm s-1

5 m s-1

It is possible is distinguish between transvers and longitudinal waves from the property of.

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Refraction

Interference

Diffraction

Polarization

The chain reaction is controlled by a series of rods usually made of.

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uranium

Cadimium

Boron

Steel

Fringe spacing in double slit experiment can be increased by decreasing.

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Wavelength of light

Width of slits

Slite separation

Distance between the slits and screen

The rms value of alternating current is always

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Infinity

Unity

Positive

Negative

When a charged particle is moved through a magnetic field if suffers is change in its.

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Charge

energy

Mass

direction of motion

A bi prism consists of.

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Two parallel glass plates

Two acute angled prisms

Two obtuse angled prisms

Two right angled prisms

Eye colour is the colour of

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Iris

Retina

Comea

Pupil

The impedance of the circuit at resonance frequency is

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Minimum

Maximum

Zero

Infinity

When a vector is multiplied by a negative number its direction.

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Remains unchanged

Changes by 180 ^o

Becomes horizontal

Vertical to each other

The net charge on a condenser is

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Zero

Q/2

2Q

Infinity

Which equation in electromagnetism describe the magnetic field B generated by an electric current.

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ampere's circuital law

Bio savart law

Gauss's law for electromagnetism

Coulomb's law

Equipotential surfaces in an electric field are always.

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Spherical

Closed surfaces

Tangent to electric lines of force

Perpendicular to electric lines of force

The force of friction that comes into action after the motion has started

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Static friction

Dynamic friction

Friction only

Limiting friction

Which form of electromagnetic radiation is used in RADAR.

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Long wavelength ultraviolet waves

short wavelength microwaves

short wavelength infrared wave

Long wavelength radiowaves

A boat loving at constant speed 'v' through still water experiences a total frictional drag F what is the power developed by the boat.

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1/2 Fv

Fv

1/2 Fv2

Fv2

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