Question # 1

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

When two vectors have opposite directions we say that they are

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Parallel

Antiparallel

Perpendicular

Out of phase

Interference through thin films depends upon

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Thickness of thin film

Nature of material of thin film

angle of incident light

All of the above

A solid in which there is no regular arrangement of molecules.

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Amorphous solids

Glassy solids

Crystalline solids

Polymerization

The best instrument used for the measurement of emf of a cell a

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A voltimeter

An ammeter

A potentiometer

Wheatstone bridge

The note of the lowest frequency is called

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beat

Overtone

Fundamental note

Harmonic note

If the K.E. of a body becomes 4 times of its initial value, the new momentum will be

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half

Same

Double

4 times

Angular simple harmonic motion is.

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Periodic rectilinear motion

Independent of any applied torque

Periodic rotational motion

Never defined

A capacitor is prefect insulator for

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Direct current

Alternating current

Direct as well as alternating current

Pulsating current

The SI unit of solid angle is

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Degree

Radian

Steradian

Candala

In the experiment of production of X rays electrons are accelerated towards the anode by

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Thermionic emission

Potential difference

Breaking potential

Cut of current

An ideal voltage source has zero.

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Current

Electromotive force

Voltage

Internal resistance

In the magnetic circuit concept the quantity analogous to electric current in electric circuit analysis is.

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Magnetic flux density

Permeability

Magnetic field intensity

Magnetic flux

A device used to determine mass of an isotope quite accurately is known as.

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Spectrometer

Mass spectrometer

Mass detector

Electronic balance

In a spectrometer experiment monochromatic light is incident normally on a diffraction gratin having 4.5 x 10⁵ lines per metre The second order line is seen at an angle of 30^o to The normal What is the wavelength of the light.

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430 nm

556 nm

589 nm

625 nm

Mean life of a radioactive sample is 100 s its half life will be

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0.693 s

1 s

6.93 s

69.3 s

Two pure inductors each of self inductance L are connected in parallel The total inductance of the combination is.

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L

2L

L/2

L/4

Who was awarded Nobel Prize for predicting meson.

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Yukawa

Pauli

Schrodinger

Fermi

Who discovered a relation between electric and magnetic field.

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Hans Christian Oersted

Michelson Faraday

Lenz

Hertz

When two identical waves are superimposed the velocity of the reasultant wave.

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Increases

Decreases

Become zero

Remain unchanged

Light of passing through a polaroid is

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Plane polarized

Unpolarized

Circularly polarized

Elliptically polarized

Which vector gives the displacement from one point another in space.

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Null vector

Position vector

Unit vector

Distance vector

What for is a modulator circuit used.

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To eliminate carrier waves

To superpose the radio frequency signal on the carrier waves

To transmit the signal

To create sound waves

If emf of the battery in a thermocouple is doubled, what is the rate of heat generation at one function.

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Remains unchanged

Becomes half

Become double

Becomes 4 times

Light wave can be polarized because they

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Are transverse in nature

Can be reflected

Have short wavelength

Have high frequncies

x-rays cannot produce

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Photoelectron

Compton electron

Electron positron pair

All of these

In a resistor, when base width decreases with increasing Vbc, this phenomenon is called.

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Tunneling

Thermal runway

Pinch off

Early effect

An image formed on the film of camera is

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Real , inverted and diminshed

Virtual, inverted and diminshed

Real upright and diminished

Virtual, upright and idminshed

The point midway between the lens surface on its participial axis

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Optical centre

Principal focus

Focal plane

Focal length

A spring of force constant k is out into three equal pats. The force constant of earth part will b e.

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k

3 k

k/3

k/2

In a n-type material there is an excess of.

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Free electrons

Holes

Quarks

Measons

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