Question # 1

Transistor stands for

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Transfer of resistance

Transfer of current

Transfer of power

Transfer of voltage

Artificial radioactivity was discovered by

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Rontgen

Becquered

Rutherford

Marie Curie and Pierre Curie

Linear magnification is equal to the ratio of.

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Size of the object to the size of the image

Size of the image to the size of the object

size of the object focal length

Size of the image focal length

Which one of the following cannot be polarized.

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Radiowave

Ultraviolet rays

X- rays

Sound waves

In a simple D.C. motor the direction of current in the motor is reversed every half revolution to keep the motor turning in the same direction which part of the motor does this.

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Brushes

Coil

Commutator

Poles

The spacing of electric field lines between two identical point charges of opposite signs

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Is not indication of the field direction

Is not dependent on the magnitude of the charges

Is an indication of the field strength

Is large when the charges are very large

What is the number of degree of freedom of an oscillating simple gravity pendulum

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1

2

3

4

Diffusion of gases occurs because the molecules of the

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Gas present in a higher concentration exerts a high pressure

Gases are different

Gasses attract each other

Gasses over about randomly

When of the following radiations are not emitted by electron transitions in atoms.

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Visible rays

Ultraviolet rays

Infrared radiations

Alpha particles

What is the refractive power of cornea in humans.

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13 dioptres

23 diaoptres

33 dioptres

43 dioptres

Radius of the Bother's orbit is r the radius of second orbit will be.

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2 r

3 r

4 r

8 r

Mostly widely used types of gas LASER are.

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Neon

Argon ion

Helium

All of these

An electric motor could be used as a

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Battery

Capacitor

Dynamic

Transofrmer

A photon is chasing an electron, whose speed is 0.9 c What is their relative speed.

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0.1 C

C

0.8 C

0.9 C

The same notes being played on sitar and veena differ in.

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Pitch

Quality

Both quality and pitch

Neither quality nor pitch

x-rays cannot produce

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Photoelectron

Compton electron

Electron positron pair

All of these

Two tuning forks of frequencies 260 Hz and 257 Hz are sounded together the number of beats produced per seconds is.

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1

3

4

257

The 'x' in X-rays means

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Xenon

Explosion

x for unknown

X makes the spot

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

If we place oure hand below a lighted lamp we feel warmer due to.

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Conduction

Convection

Radiation

None of these

A logic circuit with one input and one output that inverts the input signal at the output is.

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AND gate

NOT gate

OR gate

NOR gate

The pitch of sound depends on its

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Wavelength

Frequency

Wave amplitude

Harmonic content

Which of the following radiations can penetrate 20 cm thick steel.

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Alpha particles

Beta particles

Gama particles

Neutrons

The phenomenon of total internal reflection occurs in

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Optical fibre

Rainbow

Mirage

All of these

The charge on a helium nucleus is equal to the charge of.

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Two electrons

Two protons

Two neutrons

One proton

Solids have

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Fixed shape only

Fixed volume only

Fixed shape and volume

No fixed shape and volume

What is true is real images formed by a converging lens.

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they are inverted

They are on the same side of the lens as the object

They can never be shown on a screen

They cannot be seen

Which of the following has maximum specific heat.

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Glass

Iron

Brass

Lead

A choke coil is a coil with

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Low inductance and low resistance

Low inductance and high resistance

High inductance and low resistance

Low inductance and negligible resistance

Polarized sunglasses decrease glare on a sunny day because they

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Completely absorb light

Block a portion of light

Have a special colour

refract light

A gama ray of energy 1900 MeV is absorbed by

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Proton antiproton pair

Electron positron pair

Producing heat in the substance

The orbit

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