Online Test

Question # 1

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The 'β' is the coefficient of the gas for

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Linear expansion

Volume expansion

Area expansion

None of these

Spectrometer using diffraction grating can measure

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Wavelength of light

Frequency of light

Intensity of light

None of these

Point out the element having atomic mass = 63.5465:

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Br

Zn

Cu

Ni

At what temperature does the mean kinetic energy of hydrogen atoms increase to such extent that they will escape out of the gravitational field of earth forever

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10075°K

18000°K

14075°K

22000°K

The diffraction of light occurs, due to interference, of

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Obstructed portion

Unobstructed portion

Both obstructed and unobstructed light

None of these

One kilowatt hour is equal

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3.5 × 10⁵ J

3.6 × 10⁸ J

3.6 × 10⁶ J

3.5 × 10⁶ J

Gravitation is the property of matter which is

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External

Internal

Intrinsic

None of these

The time period of second pendulum is

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1s

2s

0.5s

4s

β-rays are infact fast moving electrons coming out from the

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Outside the nucleus

Inside the nucleus

As free electrons

None of these

Just before setting the sun may appear to be elliptical This happens due to

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Diffraction

Reflection

Dispersion

Refraction

In YDS experiment, at the center of screen is formed a:

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Dark fringe

Bright fringe

No fringe at all

None of these

On increasing the reverse bias to a large value in a p-n junction diode current

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Increases slowly

Remains fixed

Suddenly increases

Decreases slowly

AN electric bulb and a capacitor are connected in a series with an AC source on increasing the frequency of the source the brightness of the bulb

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Increases

Decreases

Remain unchanged

Sometimes increases and sometimes decreases

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

The equation PVr = Constant applies to:

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Isothermal process

Adiabatic process

Isobaric process

None of these

The ’β' is the coefficient of the gas is

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Linear expansion

Volume expansion

Area expansion

None of these

The rate of change of momentum of a molecule is equal to:

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Pressure

Work

Density

Force

When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called

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thermoionic electrons

free electrons

photoelectrons

slow electrons

Alpha-particles are

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Protons

Positron

Neutrally charged

Ionized helium atoms

Which one of the following detectors can count fast and operate at low voltage

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Geiger counter

Wilson-cloud-chamber

Solid-state detector

Scintillation counter

The magnetic field along the axis of a solenoid with 'N' turns carrying a current I is given by

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If light of low wavelength is used in Young's double slit experiment then width of the fine will

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Decreases

Increase

Not fixed

No change

If a force acts on a body whose action line does not pass through its centre of gravity.then the body will experience

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Angular acceleration

Linear acceleration

No acceleration

None of these

The r.m.s value of a.c current is always

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Positive

Negative

Zero

All of these

Internal energy per mole of gas depends on

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Viscosity

Density

Temperature

Thermal conductivity

An alternating current is that which

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changes continuously in magnitude and reverses periodically in direction

flow intermittently

varies in magnitude

gets only its direction reversed after equal intervals of time

By calculating the area under the velocity time graph, we can find the

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Acceleration

Velocity

Distance

None of these

The range of particle depends upon the factor

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charge, mass and energy of particle

density of medium

ionization potential of the atoms

all of them

Which property of waves proves that light is a transverse wave?

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diffraction

interference

polarization

reflection

The typical speed of reconnaissance jet (SR-71) is

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900 ms^-1

950 ms^-1

980 ms^-1

990 ms^-1

In carnot cycle, there are isotherms as

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One

Two

Three

Four

Nuclear force is

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Attractive and short-range force

Repulsive and short-range force

Attractive and long-range force

Repulsive and long-range force

The three equation of motion are useful only for

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linear motion with increasing acceleration

linear motion with uniform acceleration

linear motion with zero acceleration

linear motion with varying acceleration

Carnot cycle is:

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Reversible

Irreversible

Sometimes A, Sometimes B

None of these

The original source of tides is

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Ocean

Sun

Earth

Moon

Identify the exact statement among the following:

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The greater the mass of a pendulum bob.the shorter is its frequency of oscillation

A simple pendulum with a bob of mass M swings with an angular amplitude of 40°.When its angular amplitude is 20°,the tension in the string is less than Mg cos 20°

As the length of a simple pendulum is increased the maximum velocity of its bob during its oscillation will also increase

The fractional change in the time period of a pendulum on changing the temperature is independent of the length of the pendulum.

According to the Newton's formula, the speed of the sound at STP comes out to be

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220 ms^-1

330 ms^-1

332 ms^-1

280 ms^-1

The horizontal component of a projectile moving with initial velocity of 500 ms^-1at an angle 60° to x-axis is

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500 ms^-1

1000 ms^-1

250 ms^-1

zero

The relative permitivity ∈_r for Paraffined paper is

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1.9

2.0

2.2

2.9

The study of atomic structure of crystals by X-rays was initiated by W.H.. Bragg and W.L. Bragg in

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1920

1926

1910

1914