Question # 1

The main advantage of a grating over Young's apparatus is the

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Sharpness of the bright lines

Absence of dark fringes

Absence of bright fringes

Greater deviation of light

Rate of change of momentum is called.

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Torque

Force

Impulse

Inertia

The circuit in which current and voltage are in phase the power factor is.

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Zero

Unity

Double

4 times

The law of equation of energy is applicable to the system whose constituents are.

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At rest

In orderly motion

in random motion

Moving at constant speed

Two sources of sound are said to be in resonance when.

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They look like similar

They produce sound of same frequency

They are enacted by the same agent

They differ from each other

Faraday's law was deduced in

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1826

1831

1836

1841

The central ring is bright in case of Newton's rigs produced by

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Reflection

Wedges

Refraction

Transmission

Which of the following is heat transfer by means of the emission or absorption of electromagnetic radiation such as sunshine.

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Conduction or diffusion

Convection

Radiation

Mass transfer

A wire of 5 m length carries a steady current if the field inside it is 0.2 v m-1 then the potential difference will be.

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0.1 V

0.5 V

1 V

5 V

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 each particle of the fluid passing through a point follows the same path then flow is said to be

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Regular flow

Irregualr flow

Turbulent flow

Streamline flow

The loudness of a sound depends on its

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Wavelength

Frequency

Wave amplitude

Regularity

At high frequency the current through a capacitor will be

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Small

Zero

Large

Infinity

What will be the sound speed if the frequency is doubled.

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zero

Half

Double

Unchanged

if the line of action of force passes through the axis of rotation of origin, then torque is.

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Maximum

Negative

Zero

1

One rem is equal to.

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0.1 Sv

0.01 Sv

0.001 Sv

0.0001 SV

The effective resistance in an A.C. circuit is

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An inductance

An impedance

A mutual inductance

Always zero

Colour of light is determined by its

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Amplitude

Velocity in air

Wavelength

State of polarization

In an induction coil, the secondary emf is.

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Zero at the break of the circuit

Zero during make of the circuit

Very high during make of the circuit.

Very high during break of the circuit

Blood pressure of a person

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Increases with age

Describe with age

Have no change

Stops with age

A magnetic pole

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Is made of a magnetic material

Is a factious quantity

Is defined in terms of Ampere's law

Cannot be detected

x-rays cannot produce

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Photoelectron

Compton electron

Electron positron pair

All of these

Reverberation is the

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Presence of large number of overtones

presence of harsh and discordant notes

Presence of ultrasonic vibrations

Persistence of audible sound after the source has stopped

The penetrating power of X rays is least with materials of.

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High mass density

High volume density

High electron density

High weight

In a Geiger Marsden experiment why do the great majority of the Alpha particles pass straight through the metal foil.

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Atomic nuclei may contain neutrons

Atoms are electrically neutral

Atoms are largely empty space

Atoms have positively charged nuclei

In a vacuum flask the vacuum prevents heat transfer by

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Radiation only

Conduction only

Convection only

Conduction and convection

The phenomenon of total internal reflection occurs in

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Optical fibre

Rainbow

Mirage

All of these

In compound microscope, image formed by the eyepiece is

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Real

Invented

Erect

Diminished

Which of the title for combining of notes that produce jarring effect on the ear.

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Noise

Melody

Harmony

Discord

The international acceptable scientific notation of a number 123.4 is

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12.34 x 10¹

1.234 x 10²

1.234 x 10³

0.123 x 10³

When a ray light is incident at anacute angle to the boundary of the media the refracted ray.

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Bends away from the normal

Bends towards the normal

Remains undedicated

Is totally reflected

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