Online Test

Question # 1

Unlike poles of two magnets

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Attract

Repel

Neither attract nor repel

Noen fo these

The typical speed of human running is

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1 ms^-1

2 ms^-1

4 ms^-1

5 ms^-1

In p-type semi-conductor the majority charge carriers are

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Electrons

Holes

Neutrons

Protons

In case of a forced vibration the resonance becomes very sharp when the

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Restoring force is small

Applied periodic force is small

Quality factor is small

Damping force is small

When a platinum wire is heated, it appears white at

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1600°C

900°C

1100°C

1300°C

The velocity of sound at t°C is given by the relation

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V_t= V₀+ 0.61 t

V_t= V₀+ 61 t

V₀= V_t+ 6 t

None of these

Nicrom wire is an example of

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Non ohmic device

Ohmic device

Neutral device

Charged device

The theory which explains the vast diversity in an electrical behaviour of all types the materials is

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Free electron theory

Band theory

Theory based as chemical properties

None of these

The substances in which, atom are so oriented that their field support each other and the atoms behave like tiny magnets, are called

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diamagnetic substances

ferromagnetic substances

paramagnetic substances

all of them

Coplanar forces are those, which act on a

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Single plane

All planes

Common plane

None of these

By ampere s law we can computer

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Direction of magnetic field

Direction of magnetic force

Magnetic flux density

Magnetic flux

On increasing the reverse voltage in a P-N junction diode the value of reverse current will

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Gradually increase

Suddenly increase

Remains constant

Gradually decrease

The range of theβ-particle is more than theα-particle about

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400 times

200 times

100 times

None of these

Which one of the following phenomenon cannot be explained on the bases of Huygen's theory?

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Refraction

Reflection

Diffraction

Formation of spectrum

Total energy of a particle executing S.H.M of amplitude A is proportional to

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A²

A^-2

A

A^-1

Angular acceleration is produced in a body by the physical quantity called

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momentum

vibration

torque

centrifugal force

Above the curie temperature, iron becomes

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ferromagnetic

paramagnetic

diamagnetic

any one of them

Light appears to travels in straight lines since

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It is not absorbed by the atmosphere

It is reflected by the atmosphere

Its wavelength is very small

Its velocity is very large

Transverse waves can be set up in:

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Solids

Liquids

Gases

All of them

Electric field lines emerge from the changes in:

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One dimension

Two dimensions

Three dimensions

Your dimensions

None of these

If band gap between valence and conduction band material is 5 eV. The material is

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Insulator

Good conductor

Semiconductor

Such material are not exist

The ratio of the r.m.s value of the applied voltage to the r.m.s value of resulting a.c.is

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Impedance

Inductance

Reactance

Resistance

The light pulse form a helium-neon laser is

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monochromatic

coherent

intense

all of them

If v is the velocity of flow of liquid through a tube of area of cross-section A then according to equation of continuity

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v/A = constant

A/v = constant

Av = constant

None

Which of the energy of photon is detectable

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Radio waves

Microwave

γ-rays

All of these

Adiabatic change occurs when the gas expands or compresses when contained in an insulated cylinder

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Slowly

Very slowly

Rapidly

None of these

At higher temperature, the body emits short wavelengths in the region

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Infra red

Ultraviolet

Far-infra red

None of these

When the path difference between the two waves is an odd integral multiple of half of the wavelength then the two waves

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are added up

cancel each other effect

are independent of each other

none of them

The thermodynamics scale of temperature starts from

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273 K

zero

273.16 K

None of these

The rightward forces acting on a body in equilibrium are taken as

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negative

positive

either negative or positive

none of them

The materialization of energy takes place in which phenomenon?

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Annihilation

Pair Production

Compton Effect

Photoelectric Effect

Electric field lines emerge the charges in

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One dimension

Two dimensions

Three dimensions

None of these

Current provided by a battery is maximum when

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Internal resistance equal to external resistance

Internal resistance is greater than external resistance

Internal resistance is less than external resistance

None of these

The percentage errors in the measurements of mass and speed are 2% and 3% respectively.How much will be the maximum error in the estimate of the kinetic energy obtained by measuring mass and speed.

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11%

8%

5%

1%

The pair of quantities has same dimensions?

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Power, Work

Work, Torque

Impulse, Linear momentum

Both B and C

Due to the break down the p - n junction suffers

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Works efficiently

Damaged

Require more current

None of these

The area of the loop is the dissipated energy which do work against friction of domains is called

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Current loss

Voltage loss

Hysteresis loss

None of these

When a constant force is applied on a body it moves with uniform

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Acceleration

Velocity

Speed

Momentum

If the current is doubled,the deflection is also doubled in

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A tangent galvanometer

A moving coil galvanometer

Both (A) and (B)

None of these

If the mass of the uranium is much greater than the critical mass, then the chain reaction proceeds at

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Very slow speed

High speed

Rapid speed

None of these

Total energy of a body executing SHM is directly proportional is

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Square root of amplitude

The amplitude

Reciprocal of amplitude

Square of amplitude