Question # 1

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

At room temperature the p.d. between the two sides of depletion region for germanium is of the order of.

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0.3 V

0.5 V

0.7 V

0.9 V

A expression for total work done by the battery to move charge against an induced emf is equal to.

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W = LI2

W = 1/2 LI

W = 1/2 L3I

W = 1/2 LI2

X-rays spectrum may be

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Continuous spectrum

Discontinuous spectrum

Line spectrum

Continuous and line spectrum

A heart coil is out into two equal parts and only one part is now used in the heater The heat generated will be.

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Halved

One fourth

Doubled

4 times

The half life of a radioactive substance depend on.

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Pressure

Temperature

Amount of substance

No external influences

Which kind of thermodynamic process is defined as with no heat transfer into or out of a system i.e. Q =0

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Isobaric process

Isochoric process

Isothermal process

Adiabatic process

Which of the following is dimensionless.

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Strain

Stress

Pressure

Volume

Which Muslim Scientist is regarded as 'Father of Optics"

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Nasir al Din al Tusi

Ibn Ishaq al kundi

Ibn Musa Al khawarzmi

Ibn al Haithem

If a force of 10 N makes an angle of 30 ^o with x-axis its component is given by

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1.866 N

8.66 N

0.89 N

0.866 N

Conductance is the reciprocal of.

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Capacitance

Inductance

Resistance

Admittance

Which material has the greatest di electric constant.

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Mylar

Glass

Germanium

Water

Which of the following factors determines the resolving power of an instrument.

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magnification

Total length of objective

Diameter of objective

Refractive index of objective

When sound waves enter a different medium the quantity that remains unchanged a.

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Wavelength

Speed

frequency

Intensity

The relation between refractive index an critical angle is.

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sin C =1/n

sin n = 1/C

sin c = 1

n = sin C

Who invented the first closed tube thermometer in 1713

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Gabried Fahrenheit

Galileo

anders Celsius

Lord Kelvin

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

Photo diodes are used as

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Optical fibre receivers

Automatic switching

Logic circuits

All of the above

What is the represented by the area inside the Carnot cycle.

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Heat taken to increase the body temperature.

Energy loss due to leakage

Useful work done

Heat rejected by the system

Which of the following is an example of negative work.

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a thrown up cricket ball

Grass mower

A car on road

Bucket in the well

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

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Tuning fork

Flute

Drum

Harmonium

An object of placed at the centre of curvature of a concave mirror The image produced by the mirror is located.

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Out beyond the centre of curvature

At the centre of curvature

Between the centre of curvature and the focal point

At the focal point

A physical quantity not directly involved in rotating motion is.

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Moment of inertia

Mass

Angular velocity

Torque

Which law states that the angle of incidence equals the angle of refraction.

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Law of reflection

Law of refraction

Snell's law

Hygens's principle

The power dissipation in a pure inductive or capacitive circuit is.

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Maximum

Minimum

Zero

Infinity

In vacuum all electromagnetic waves have the same.

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Frequency

Amplitude

Speed

Wavelength

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

The average K.E. of the molecules of an ideal gas in a closed rigid container is increased by a factor of 4 What happen to the pressure of the gas.

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It remains the same

It increases by a factor of 2

It increases by a factor of 4

It increases by a factor of 8

To final image produced by a compound microscope is.

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Real and inverted

Real and erect

Virtual and erect

Virtual and inverted

Bernoulli's equation is Applica table to points

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In a steady flowing liquid

In a streamline

In a straight line perpendicular to steamline

In any non viscous liquid

A solid object is

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Not elastic below the elastic limit

Not elastic above the elastic lime

Elastic below the elastic limit

Not elastic at all

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