Online Test

Question # 1

A thief stole a box with valuable article of weight W and jumped down a wall of height h.Before he reached ground he experienced a load of

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2W

W

W/2

Zero

Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in

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1916

1919

1921

1923

Insulators are those material in which energy gap is

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very large (several eV)

very narrow (= 1ev)

either of them

none of them

A gas STP is slowly compressed to one fourth of its original volume, then final pressure is

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4 atmosphere

0.75 atmosphere

8 atmosphere

0.25 atmosphere

The SI unit gravitational potential is

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Joule/Kg

Kg/joule

Joulex/Kg

When lorentz force on a charged particle become zero then the speed of charged particle is given by

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v = E/B

v = EB

v = E + B

v = qEB

To diagnose the disease of eye we use

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Solid laser

Carbon laser

Glass laser

He-Ne laser

The total energy of the bound constituents in the nucleus is:

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Less than when they are free particles

Greater than when they are free particles

The same as when they are free particles

Much greater than when they are free particles

Infinite

If two waves of length 50 cm and 51 cm produced 12 beats per second the velocity of sound is

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360 m/s

306 m/s

331 m/s

340 m/s

In order to hear the echo of a sound the minimum distance between the listener and the obstacle must be (velocity of sound 332 ms^-1)

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About 33 m

About 17 m

About 9.5 m

About 8.5 m

When OP-AMP is used as inverting amplifier, which of the input terminal is grounded?

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inverting

non-inverting

any one of them

none of them

In pure inductor, the power dissipation is

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Maximum

Minimum

Zero

None of these

Thick tar and honey have

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Small coefficient of viscosities

Large coefficient of viscosities

Zero coefficient of viscosities

Moderate coefficient of viscosities

The magnetic moment of electron is

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9.27 x 10^-24 joule/Tesla

9.27 x 10^-24 Tesla/joule

9.27 x 10^-23joule/Tesla

9.27 x 10^-23Tesla/joule

Acceleration produced in a body by a force varies

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inversely as the applied force

directly as the mass of the object

directly as the mass of the body

none of them

Find the distance through which the mass must be pulled down and then released with a velocity of 1.0 ms^-1 and given that ω = 8.94 s^-1

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0.12 m

.011 m

0.10 m

0.09 m

The sink in the heat engine is at

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Low temperature

High temperature

Zero temperature

None of these

In YDS experiment, if the distance between the slits and also the distance between slits and screen is doubled, the fringe width

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Becomes doubled

Becomes 4 times

Is halved

Remains the same

A potentiometer circuit gives continuously varying

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Charge

Capacitance

Potential difference

Inductance

The solid state detector is specially designed device used for

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α-particles

β-particles

γ-rays

None of these

A uniform beam of weight 100 N is 4 m long and is supported 1.0 m from one end. A load of weight wN hangs from that ened and the beam is in equilibrium.What is the value of w?

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50 N

75 N

100 N

200 N

Which of the following phenomenon is not application of Bernoulli s equation

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Swing in cricket ball

Flying of airplane

Working of carbonator

Beats

The chemical which damage the Ozone layer in the atmosphere is

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Benzene

Chlorofluorocarbons (CFC)

Alcohol

None of these

Marie Curie and pierre Curie discovered two new radioactive elements which

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Uranium and polonium

Polonium and Radium

Radium and Uranium

Uranium and plutonium

The time taken by an AC of frequency 50 Hz to complete one cycle will be

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2 second

0.2 second

0.02 second

0.1 second

Electric force is the force which is experienced by a positive charge to produce

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Displacement

Work

Attraction

None of these

The proper time measured in

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Inertial frame

Non-inertial frame

Stationary frame

None of these

The term drift velocity is used when the ends of a wire are:

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Connected to a lesser source

Connected to a voltage source

Not connected to a voltage source

At different values of potential

Both B and D

The formula for the velocity of sound is

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According to Einstein, with the great increase in the speed of the body the relativistic length of the body

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remains constant

decreases

increases

reduces to zero

Force of friction between different layers in present in

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Gases

Solids

Liquids

Both A and C

X-rays are affected by:

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electric field

magnetic field

Both a & b

None of these

The viscosity of liquid is due to

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Adhesive force

Cohesive force

Gravitational force

Diffusion

The cross product of two perpendicular vectors has magnitude

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Maximum value

Minimum value

Zero

None of these

In which process the P - V diagram is a straight line parallel to volume axis

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Isobaric

Isothermal

Isochoric

Adiabatic

The energy of theγ-rays more than 1.02 Me V the dominant process is

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Compton effect

Pair production

Photo electric effect

None of these

Heat is a form of

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Power

Work

Energy

Motion

The fiber of which refractive index ______ gradually as move from central core to its periphery is called ______ index fiber

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Decreases, multi-mode graded

Increases, single mode step

Either of A or B

Increases, multi-mode step

The resistivity of silver is

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1.59 x 10^-3Ωm

1.52 x 10^-8Ωm

100 x 10^-8Ωm

0.5Ωm

Why do real gases deviate from ideal bahaviour?

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Real gases consist of a very small number of molecules within a given volume

Real gasses have intermolecular forces

Molecules of real gases are not in rapid, random motion

None of them

A ballistic missile is

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Unpowered

Unguided

Both

None of these