Online Test

Question # 1

Which one is not correct representation?

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5N

3 Newton

5 Newton

both a and b

The magnetic field lines inside a bar magnet run in a direction

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From north to south pole

From south to north pole

From side to side

None of the above

Alfa particles are

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hydrogen nuclei

helium nuclei

electrons

photons

A ______ lens is used in the apparatus to get Newton,s rings

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Plano-concave

Plano-convex

Convexo-concave

Double convex

A conductor of capacity 50 μF is charged to 10V.The energy stored is

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1.25 x 10^-3 J

3.75 x 10^-3 J

2.5 x 10^-3 J

5 x 10^-3 J

A piece of wire along which charges are made to accelerate is known as

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Transmitting antenna

Receiving antenna

Modulator

Nor of these

If the K.E.of a body becomes four times of the initial value.then new momentum will

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Become twice its initial value

Become three times.its initial value

Become four times.its initial value

Remains constant

Essential characteristic of equilibrium is:

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Momentum equal to zero

Acceleration equal to zero

Kinetic energy equal to zero

Velocity equal to zero

If a simple pendulum oscillates with an amplitude 50 mm and time period of 2s,then its maximum velocity is

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0.10 m/s

0.15 m/s

0.8 m/s

0.16 m/s

Debye is the unit of

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Magnetic dipole moment

Electric dipole moment

Density

RMS velocity

The force acting as one meter length of the conductor placed at right angle to the magnetic field, when one Ampere current is passing through it

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Magnetic density

Magnetic intensity

Magnetic induction

None of these

When a silicon crystal is doped with a pentavalent element, then the atom of the pentavalent element is known as

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acceptor

donor

either of them

none of them

The transmission of information by light waves may be

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An audio signal

A television signal

A computer data signals

All of them

In electronic quenching

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A gas is used

A positive voltage is used

A negative voltage is used

A large negative potential is used

At high speeds the force is no longer

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Proportional

Simply proportional

No proportion

None of these

When θ = 0 in relation d sinθ = λ, the path difference between the rays coming out from the slits of the grating will be zero. So the image in this directions is

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Dark

Bright

Non image formed

None of these

Which of the following is not an assumption of the kinetic theory of gases?

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Gravitational forces on the gas particles are negligible

Intermolecular forces are negligible except during a collision

The volume of the gas particles is negligible compared to the volume of the container of the gas

Molecular-molecule collisions are elastic and molecule-container are inelastic

The sink in the heat engine is at

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Low temperature

High temperature

Zero temperature

None of these

Every crystalline solid has a melting point

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Definite

Not definite

Any

Change every time

Newtons laws are empirical laws, deduced from

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Theories

Experiments

Facts

None of these

The idea quantization of energy was proposed by

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Einstein

Max Planck

Compton

None of these

When an observer is standing on a railway platform, the pitch of the whistle of a train which is moving away is heard to be

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higher

lower

unchanged

all of them

Any person like an airline pilot, sailor can find his position on Earth surface by pocket size instrument within accuracy of

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5 m

10 m

10.5 m

11 m

The life time of an electron in an excited state is about 10^-6 s. What is its uncertainty in energy ΔE during this time ?

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1.09 × 10^-20 J

1.05 × 10^-26 J

1.79 × 10^-34 J

None of these

Acceptor impurities donate

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Holes

Electrons

Both Electrons and Holes

None of them

The speed at which light travels within the material depends upon

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Refractive index of medium

Wavelength

Frequency

Intensity

X-ray region lies between

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Short radio waves and visible region

Visible and ultraviolet region

Gamma ray and ultraviolet region

Short radio waves and long radio waves region

A book is lying on the table What is the angle between the action of the book and the reaction of the table on the book

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0°

180°

30°

90°

In a capacitive circuit

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Current leads voltage by phase of π/2

Voltage leads current by phase of π/2

Current and voltage are in same phase

Sometime current and sometime voltage leads.

The effect of decrease in pressure with the increase in speed of the fluid in horizontal pipe is drive from

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Bernoulli's theorem

Venturi effect

Torricelli's theorem

Diastolic effect

The concept of position is purely

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Specific

Relative

Ordinary

None of these

Conductance is:

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Another name of resistance

Reciprocal of resistance

Measured in mho

Measured in siemen

All are true except A

The resistance of 2, 3, 4Ω are provided. Their equivalent resistance will be the minimum when they are connected:

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In series

In parallel

In series and in parallel

Any of above

None of these

The deformation produced in the body by an applied force in their

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Shape

Length

Volume

All of them

Almost 99.9% of mass of an atom is concentrated in

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Electron

Orbital part

Neutron

Nucleus

In an ac circuit with voltage V and current 1 the power dissipated is

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VI

1/2 VI

1/√2 VI

Depends on the phase between V and I

Applications for photocells is / are

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Automatic street lighting

Exposure meter for photography

Sound track of movies

All of these

If 5000 lines per cm are ruled on different on a diffraction grating then the slit spacing will be

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5 x 10^-3A°

2 x 10^-4A°

5 x 10^-5A°

2 x 10⁴A°

Thermisters are made by heating under high pressure

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Semiconductor ceramic

Insulators

Metals

None of these

In petrol engine, the third stroke is the

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Intake

Power

Exhaust

None of these

The magnetic fields are produced by the

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Moving charges

Bar magnets

Motion of conductor in a magnetic field

All of them