Question # 1

If yellow light emitted by sodium lamp in Young's double slit experiment is replaced by blue light of the same intensity

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Fringe width will decrease

Fringe width will increase

Fringe width will remain unchanged

Fringe will become less intense

The device in which induced emf is statically induced emf is:

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Transformer

AC generator

Alternator

Dynamo

The A.M. transmission frequency range from

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500-1000 KHz

540-1600 KHz

300-490 KHz

900-2040 KHz

Coulomb multiplied by volt by volt gives the unit called:

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farad

Ohm

Second

joule

Watt

The nucleus left after the emission of some radiation is called:

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Parent nucleus

Daughter necleus

Mother necleus

Any of these

None of these

In the force applied is parallel to the direction of motion, then work done is:

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Maximum

Minimum

Zero

None of these

A magnetic force on an electron travelling with 10⁸ms^-1parallel to a field of strength 1 Wb m^-2is

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Zero

10⁵m

10^-10N

10⁸N

The value of resistivity is the least for:

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Copper

Aluminimum

Silver

Tungsten

Iron

In the equation E=mc²value of c is:

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1,86,000 miles per hour

1,86,000 miles per sec

3 X 10⁸m/sec

Both A and C

Both B and C

Cause of heat production in a current carrying conductor is

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Collisions of free electrons with one another

High drift speed of free electrons

Collisions of free electrons with atoms or ions of conductor

High resistance value

There is present in paraffin a large amount of:

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Nitrogen

Hydrogen

Carbon

Baryllium

Lithium

A grating with high resolving power can distinguish _______ difference in wavelengths :

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Smaller

Larger

Zero

None of these

The mass of a body measured by a physical balance in a lift at rest is found to be m, if the lift is going up with an acceleration a, its mass will be measured as

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m (1 - a/g)

m (1 + a/g)

m

Zero

Laws of reflection and refraction can also be explained by:

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Particle nature of light

Quantum nature of light

Wave nature of light

Complex nature of light

Work has a dimension as that of:

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Torque

Angular momentum

Linear momentum

Power

The internal pressure of the blood is

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less than the external atmospheric pressure

greater than the external atmospheric pressure

equal to the external atmosphericpressure

none of them

If we connected the ordinary DC ammeter to measure alternating current, it would measure its:

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Instantaneous value

RMS value

Value averaged over a cycle

Either (B) or (C)

Either (A) or (C)

An induced current can be produced by

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Constant magnetic field

Changing magnetic field

Varying electric field

Constant electric field

None of these

Faraday's law of electromagnetic induction has been used in the construction of:

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Galvanometer

Voltmeter

Electric motor

Electric genrator

Commutator

In rotational motion, analogue of force F us called:

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Couple

Torque

Mass

Moment of intertia

In Pakistan electricity is supplied for domestic use at 220 V, it is supplied at 110 V in USA. If the resistance of a 60 W bulb for use in Pakistan is R, the resistance of a 60 W bulb for use in USA will be

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2 R

R/4

R/2

R

When two protons are brought are brought closer potential energy of both of them:

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Increases

Decreases

Remains same

None of these

Light waves are:

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Transverse wave

Longitudinal wave

Compressional wave

None of them

If the length of the conductor is double and its cross sectional area is halved, its conductance will

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Increase four fold

Become one-fourth

Become one-half

Remains unchanged

Neutron was discovered in

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1915

1920

1925

1932

Tick the correct answer:

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Torque is a vector quantity

Torque is the turning effect of a force

Torque is called moment of a force

All of above

The electric intensity at infinite distance from the point charge will be

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Infinite

Positive

Zero

Negative

The contrast in the fringes in an interference pattern depends upon

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Fringe width

Relative difference intensities of the two sources

Distance between the slits

Wavelength

A voltmeter is used to measure the

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potential difference

current

temperature

resistance

The magnitude of alternative voltage V:

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Always increase

Always decrease

Remains constant

Does not remain constant

None of these

One radian is

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Greater than one degree

Less than one degree

Equal to one degree

None of these

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