Question # 1

If a body of mass 'm' was released in a vacuum just above the surface of a planet of mass M and radius R what will be the gravitational acceleration.

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GmM/R

GM/R²

GM/R

GM/2R

Which electrical component may be used to store electrical energy in a time delay circuit

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Capacitor

Light dependent resistor

Resistor

Thermistor

A ball mass 0.25 kg is thrown to a height of 20 m The change in G.P.E is

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49 J

50 J

-75 J

500 J

An example of forced oscillation is

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the pendulum of a clock

The wind screen wiper

A plucked sonometer wire

A sonometer wire excited by a tuning fork

A system of the equal and opposite point charges separated by a small distance is called.

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A capacitor

A dipole

An iinductor

A di electric

What happens to internal energy of a piece of lead when hammered.

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Increases

Decreases

Remains unchanged

Becomes zero

In n-p-n transistor the current flows in the direction from

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Emitter to base

emitter to collector

Base to emitter

Base to collector

What is the emission of light by a substance that has observed light or others electromagnetic radiations of a difference wavelength.

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Fluorescence

Illuminance

Luminance

Incandescence

The critical angle will be maximum when light travels from

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Glass of air

Water to air

Water to glass

Glass to water

Geiger counter was designed by

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Wilson

Geiger and Muller

Lawrence

Mosely

A rocket propulsion is based on the principle of.

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Conservation of momentum

Conservation of mass

Conservation of energy

Floatation

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

Rainbows and mirage are formed by

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Reflection only

Refraction only

dispersion only

A combination of refraction, total internal refraction and dispersion

Though the wavelength of X-rays is smaller than that of visible light yet the speed of X-rays in vacuum is.

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longer that that of visible light

Smaller than that of visible light

Same as that of visible light

Unpredictable

When a projectile reaches the highest point the vertical component of velocity becoems.

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Small

Vi cos thetha

Zero

Maximum

Absolute zero may be regarded as the temperature of which

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Water freezes

All substances are solids

All gases become liquids

Molecular motioning a gas would ceases

Which of the following is not an elastic collision

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A man jumps on a cart

A bullet embedded in a block

Colliding of two glass balls

Colliding of two tennis balls

If we use two diodes and a centre tapped transformer we eill get

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Transistor

Amplifier

Half wave rectifier

Full wave rectifier

In a vacuum flask the vacuum prevents heat transfer by

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Radiation only

Conduction only

Convection only

Conduction and convection

Balmer identified the spectral lines in the spectrum of hydrogen in

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1785

1885

1936

1966

Generally, electrical resistivity of intrinsic semiconductors decreases with increasing.

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Pressure

Volume

Temperature

Density

The shape of wave front depends on

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Density of medium

Shape of medium

Viscosity of medium

Length of medium

Which of the following is a non contacting device that intercepts and measures thermal radiation.

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Thermometer

Pyrometer

Voltmeter

Lactometer

A physical quantity not directly involved in rotating motion is.

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Moment of inertia

Mass

Angular velocity

Torque

We get light inside a room in a day time due to

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Interferences

Polarization

Diffraction

Refraction

Which of the following materials has highest magnetic suscaptibility.

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Uranium

aluminium

Platinum

Sodium

Which type of microscope was the first to be developed.

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Optical microscope

Digital microscope

Electron microscope

All were developed at the same time

A shell explodes and many pieces fly off in different directions, which of the following is conserved.

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Momentum

K.E.

Momentum and K.E

Neither momentum nor K.E.

Which effect produce ultrasonic is quartz.

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Pyroelectric effect

Piezoelectric effect

Hall effect

Magnetostriction effect

What do we study by crystallography.

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The analysis of X ray spectra of elements and study of crystal structure.

Visible spectra of sources and crystal study

Ultraviolet spectra of sources and crystal study

Characteristics of X-rays

Who discovered a phenomenon of thermos electricity.

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Peltier

Joule

Seeback

thomson

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