Question # 1

Alpha particles are used for the treatment of skin of a patient due to.

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Highly ionizing power

Low penetration power

Positively charged particles

Helium nucler

Which one of the following is not a dimensionless quantity.

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Radian

pi

Decibel

Force

Self inductances of solenoid is

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Directly proportional to the current flowing through the wire

Directly proportional to its length

Inversely proportional to area of corss section

Directly proportional to number of turns

For capacitors connected is series.

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The difference of potential is same for an

The charge on each is the same

The resultant capacitance is greater than

The charge on each is not the same

Beta decay may occur by

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Beta minus

Beta Plus

Electron capture

All of these

A galvanometer can be converted into voltmeter by connecting in series with the galvanometer a

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Low resistance

High resistance

Resistance of intermediate range

Shunt

Let at constant temperature the pressure of an ideal gas be doubled so that the new volume is.

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Doubled the original volume

Same as original volume

Reduced to half the original volume

Reduced to two times the original volume

Simple harmonic motion is a type of

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rectilinear motion

Circular motion

Rotational motion

Zig Zag motion

A wave that consists of oscillations occurring perpendicular to the direction of energy transfer is called.

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Transvers wave

Longitudinal wave

Stationary wave

Shock wave

Who studied the change in velocity with the help of geometry for the first time.

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Nicole Oresme

Galileo

Alberuni

Ibn al haithem

Which of the following is conserved in SHM

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K.E.

P.E

Total energy

Electrical energy

The Fahrenheit and Kelvin scales intersect at

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40

-40

140

-140

An important application of the semi conductor is the

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Vacuum tube

Fluroescent tube

Copper oxide rectifier

Battery

The immediate cause of alternating currrent in the secondary coil of a transformer is

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A changing electric field

a changing magnetic field

The motion of primary coil

The iron core of the trnasformer

Why is a capacitor resistor combination used in oscillators in grid circuit.

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To generate oscillation

To bias the grid automatically

To amplify oscillations

To sustain the oscillations.

In a magnifying glass, the objective is placed at a distance

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Less than the focal

Between the focal length and twice the focal length

Greater than twice the focal length

At the focus of the lens

If the number of gas molecules in a cubical vessel is increase from N to 3 N then its pressure and total energy will be.

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Half

Three times

Double

Four times

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

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Interferences

Polarization

Diffraction

Refraction

The term used for heat capacity per unit mass is.

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Latent heat

Specific heat

Energy density

Specific energy

Fluid mechanics is the study of how fluid move and the other ting involved is

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Energy

Velocity

Forces

Position

The critical mass of a fission reaction is.

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The mass to start a nuclear fission reaction

The minimum mass for chain reaction

The size of the reactor core

The size of fuel plus the size of moderator

Certain gas are called permanent gases because.

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They cannot be liquified

They are perfect gases

The critical temperatures are low

their boiling points are low

A piece of weighed wood just floats in water when placed in alcohol will

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Float lower

Float higher

Stay as before

Sink

The gas temperature is increased from 27 ^oC to 127 ^oC What is the ratio of mean kinetic energies.

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3/4

4/3

9/10

10/9

What is the power factors of wattles current.

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Infinity

Unity

0.5

Zero

What is the effect on the product of resistivity and conductivity if the temperature of a conductor is increased.

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It decreases

It increases

It remains the same

It may increase or decrease

An ideal voltage source has zero.

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Current

Electromotive force

Voltage

Internal resistance

The resistance of a coil changes directly with

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The current of A.C.

The frequency of A.C

The inductance

Both B and C

Which one of the following has maximum frequency.

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Visible light

Gama rays

Ultraviolet rays

Infrared rays

The phenomenon of exactly zero electrical resistance occurring in certain materials below a characteristics temperature is called.

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Resistivity

Conductivity

Super conductivity

Volume resistivity

Alternating current generator consists of a coil and a pair of.

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Split rings

Slip rings

Metal rings

Copper rings

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