Question # 1

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

If a conductor sun infirmly stretched so that its length is increased in timed, then its resistance becomes.

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n times the original resistance

1/n times the original resistance

n2 times the original resistance

n3 times the original resistance

Which material has the larges resistivity.

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Silver

Germinium

Amber

Sulphur

With which factor disputative power of a grating increases.

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Order of spectrum

Number of lines per centimeter

Order and number of lines per centimeter

Shape of the grating

Which of the following pair of physical quantities have the same dimension.

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Momentum and pressure

Energy and work

Linear and angular momentum

Force and surface tenstion

When speed of a moving body becomes double.

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Its K.E. is doubled

Its acceleration is doubled

Its P.E. is doubled

Its momentum is double

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 particle is removed by a photon.

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Quark

Electron

Proton

Neutron

Refractive index of a medium is define das.

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speed of light in vaccum/speed of light in medium

Speed of light in medium/Speed of light in vacuum

Speed o flight in air/speed of light in medium

Speed of light in medium/Speed of light in air

A ball is thrown straight up when the ball reaches the highest point.

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Both is velocity and acceleration are zero

In velocity os zero but acceleration is not zero.

It acceleration is zero but velocity is not zero.

Neither velocity nor acceleration is zero.

A convex lens of focal length 6 cm to be used to from a virtual image three times the size of the object Where must the lens be placed.

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1 cm

2 cm

3 cm

4 cm

Which Muslim Scientist gave the first clear description and correct analysis of pinhole camera.

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Nasir al Din Al tusi

Ibn al Haithem

Ibn Ishaqal kundi

al -Khawarizmi

When light enters a denser medium

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Its speed slows down

Its speed increases

It is totally reflected

Its speed remains unchanged

Which is the best sound source to produce a pure note.

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Tuning fork

Flute

Drum

Harmonium

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

No current flows between two charged bodies when connected if they have same.

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Charge

Capacity

Potential

Shape

The phenomenon of exactly zero electrical resistance occurring in certain materials below a characteristics temperature is called.

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Resistivity

Conductivity

Super conductivity

Volume resistivity

The force that bonds protons and neutrons together int he nucleus despite the electrical repulsion of the protons is called.

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Molecular force

Nuclear force

Atomic force

Gravitational force

In a charged capacitor the energy resides

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In the negative plate

In the positive plate

In the field between the plates

Around the edge of the plates

For the angular momentum of a system to remains constant, the external torque should be

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small

Large

Neither small nor large

zero

Which is the famous standard model of the universe.

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the big bang

Casmos

Astronaut

The small stap

The magnitude of induced emf during electromagnetic induction is controlled by.

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Magnetic flux

electric flux

Electric field

Magnetic field

When the battery is being charged its terminal potential difference than its emf is.

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Less

Greater

Double

Squared root

Lagging of magnetic flux density behind magnetic field is known as.

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Permeability

Susceptibility

Hysteresis

Uncertainty

A neutron is in head on elastic collision with a stationary nitrogen nucleus The mass of nitrogen nucleus is 14 times that of a neutron The neutrons velocity after the collision is.

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Less in magnitude than its intimal velocity

Less in magnitude than the final velocity of the nitrogen atom

Equal in magnitude to its initial velocity but in the opposite direction

Greater in magnitude than its initial velocity

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

Two tuning forks have same natural frequency One of them is now loaded with wax. When both the forks are sounded together the will

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Produce interference

Produce vibrations

Remain in resonance

Produce beats

Coulomb found that the mutual force between tow electric charges varies.

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Inversely as the distance

Inversely as the square of the distance

directly as the distance

Directly as the distance squared

The SI unit of coefficient of viscosity of

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kg m s-1

kg m-1 s-1

kg ms -2

Base current of a transistor is 1 mA and collector current is 99 mA What is emitter current.

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1 mA

100 mA

98 mA

110 mA

The critical mass of fissionable uranium -235 can be reduced by

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Adding impurities to it

Heating the material

surrounding it by neutron reflecting material

Surrounding it by neutron absorbing material

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