Question # 1

Two wires P and Q each of same length and the same material are connected in parallel to a battery The diameter of P is half that of Q What fraction of the total current passes through P.

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0.02

0.25

0.33

0.50

Pure silicon has valence electrons

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1

2

3

4

What would be the magnitude and direction of acceleration which would made the spring balance reading zero.

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Zero

1 m s-2 upward

9.8 m s-2 upward

9.8 m s-2 downward

If two gases have same reduced pressure volume and temperature it is according to

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Boyle's law

Charles law

Law of corresponding state

Zeroth law

The critical angle for a beam of light passing from water into air is 48.8 o This mean that all light rays with an angle of incidence greater than this angle will be.

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Absorbed

Totally reflected

Partially reflected and partially transmitted

Totally transmitted

As the mass number varies, which of the quantities does not change w.r.t nucleus.

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Mass

Volume

Binding energy

Density

In case of longitudinal waves the individual particles of the medium move.

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In circles

In ellipses

Parallel to wave propagation

Perpendicular to wave propagation

Cs - 137 is a radioisotope used ot determine the thickness of the walls of steel pipes Cs 137 is chosen because it emits

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Radiowaves

Alpha particles

Beta particles

gama particles

If a force 5 N applied parallel to a moment arm 5 m then torque will be

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0 N m

5 N m

10 N m

25 Nm

A point mass moves through a circular arc of length 'l' and radius 'r' in time 't' what is the angular velocity about the centre of the circle.

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i/rt

r/it

2/rt

rt

Phenomenon of radioactivity is due to disintegration of.

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Proton

Neutron

electron

nucleus

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

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orange

Cherry red

Dull red

White

Light waves can be polarized because they

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have short wavelength

Have high frequency

Can be reflected

Are transverse

Which of the following represents an elastic wave.

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Light waves

Radiowaves

X-rays

Sound waves

A deuteron is

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A type of proton

A proton neutron bounded to gather.

A type of beta particle

A type of neutron

Total internal reflection occurs when the angle of incidence is.

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Greater than the angle of refraction

Equal to the critical angle

Greater than the critical angle

Greater than 45^o

Which term given below refers to the concept moving clocks run slower than clocks at rest w.r.t an observer.

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Simultaneously

Mass variation

time dilation

Length contraction

The free electron theory explains conduction in

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Insulators only

Metals only

Semi conductor only

Non metals only

Which of the following devoices are used for measuring temperature.

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Thermocouples

Thermistors

Thermometers

All of these

A perfect gas is one whose

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Molecules are masless

Molecules are energetic

Molecules are perfectly elastic

Molecules are at rest

On which parameter, the heat capacity of a material depends upon.

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Density of the material

Specific heat of the material

Temperature of the material

Structure of the material

Geiger counter was designed by

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Wilson

Geiger and Muller

Lawrence

Mosely

The energy transmitted per second though unit are held perpendicular to the direction of propagation of the wave is called.

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Intensity of sound

Pitch of sound

Loudness of sound

Quality of sound

Planets move around the sun due to.

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Centrifugal force

Centripetal force

Gravitational pull between them

Frictional force between them

The specific heat of an ideal gas values as

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To

T1

T2

T3

When the source and observer are moving away from each other the apparent pitch will

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Increases

Decreases

Be zero

Be infinite

The angular momentum of a body about a fixed point is conserved if its velocity

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Decreases

Increases

Remain the same

Becomes zero

Magnetic lines of force due to earth's horizontal magnetic field are.

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Curved lines

Elliptical

concentric circles

Parallel and straight

A fringe is a path of.

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Constant amplitude

Constant phase

Same wavelength

Constant frequency

The point of which an applied force produces a linear acceleration but no rotation is called.

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Centre of the body

Centre of the mass

Centre of gravity

Weight of the body

The minimum angle of incidence for which total internal reflection can occur is called.

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Right angle

Acute angle

Critical angle

Obtuse angle

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