Online Test

Question # 1

A highly direction beam of ultrasonic waves can be made to travel in water in

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Many meters

Many kilometer

Several kilometers

None of these

A double convex lens act as a diverging lens when the object is

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Inside the focus

Between f and 2f

At the focus

At a large distance

The CRO is used for displaying the waveform of a given

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current

voltage

both of them

none of them

Pressure exerted by a gas is

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Independent of density of the gas

Inversely proportional to the density of the gas

Directly proportional to the square of the density of the gas

Directly proportional to the density of the gas

The maximum displacement of a particle executing SHM from its mean position is 2 cm and its time period is 1 s. the equation of its displacement will be

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x = 2 sin 4 πt

x = 2 sin 2 πt

x = sin 2 πrt

x = 9 sin 2πa

The term Brownian movement refers to

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Irregular motions of small particles suspended in a fluid

Convection currents in a liquid or gas

Convection currents in a gas but not in a liquid

The stretching of a body beyond its elastic limit

The SI unit gravitational potential is

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Joule/Kg

Kg/joule

Joulex/Kg

What constant is measured in:

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Meter per kelvin

Meter kelvin

Kelvin per meter

Joules

Dynes

The dielectric constant K of an insulator cannot be

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2

10

5

∞

Magnetic flux density at any point due to current carrying conductor can be computed by:

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Ampere's law

Faraday's law

Lenz's law

Newton's law

Coulomb's law

Adiabatic change occurs when the gas

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expands

compresses

expands or compresses

expands or compresses rapidly

The magnitude of the drift velocity is of the order of:

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10^-6ms^-1

10^-3ms^-1

10³ms^-1

10⁶ms^-1

None of these

To increase the measuring range of a voltmeter the series resistance should be

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Increased

Decreased

Kept constant and R_g should be increased

Zero

The magnetic field at the centre of a current carrying circular loop is B. If the radius of hte loop is doubled keeping the current the same, the magnitude filed at the centre of the loop would be

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B/4

B/2

2B

4B

Pair production of annihilation of matter, the two photons produced move in opposite direction to converse

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momentum

charge

energy

mass

In compressional wave, the layer of medium having reduced pressure is called:

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Compression

Elasticity

Node

Rafefaction

If current carrying conductor is placed perpendicular to the magnetic field, it will experience a force:

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Zero

ILB cosα

ILB

Both A and B

Both B and C

Fluid friction of a spherical body depend on the

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Shape

Size

Orientation

All of these

According to the special theory of relativity, a moving clock

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runs faster

neither runs faster nor slower

all of them

11 According to the special theory of relativity time is

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absolute quantity

not absolute quantity

constant quantity

none of them

For incident angles equal or greater than the critical angle the glass air boundary will act as a

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Convex mirror

Concave mirror

Mirror

None if them

The high blood pressure is known as

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Diastolic

Systolic

High blood pressure

None of these

What type of temperature coefficient of resistance are thermisters ?

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Negative

Positive

Neutral

Positive and negative

Ordinary light has components of vibrations in all possible planes. Such light is

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Unpolarized light

Polarized light

Both

None of these

How many the multiplications of vectors are ?

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Three

Two

One

None of these

Given sample of 1 ml hydrogen and 1 ml oxygen both at S.T.P which sample has higher number of molecules

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Oxygen

Hyderogen

It depends upon work when it expands

Both will have the same number of molecules

At the same temperature and pressure for the gases having the same value ofγ, the speed is inversely proportional to the

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3 powers square root of density

2 powers square root of density

Square root of their densities

None of these

Which one of the following can act approximately as a source of monochromatic light:

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Neon lamp

Fluorescent tube

Sodium lamp

None of these

The radial magnetic field produced in a moving coil galvanometer is due to

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Iron Cylinder

Turns of coil

Concave pole pieces

None of these

The maximum distance of body from mean position when body is executing SHM is called

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Time period

Displacement

Amplitude

Frequency

A signal applied at the inverting input of an O.P appears after amplification at the output terminal with a

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Phase shift of 90^o

No phase shift

Phase shift of 180^o

None of these

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At every degree Celsius rise of temperature, the volume of a given mass of a gas at constant pressure increases by

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1/273 of its value at 0°C

1/373 of its value at 0°C

1/173 of its value of 0°C

1/700 of its value at 0°C

In projectile motion the vertical acceleration is

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Zero

Maximum

'g'

None of these

The relativistic mechanics in which object move

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Less than C

Greater than C

Equal to C

Approach to C

The process through which photons can interact with matter is:

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Photoelectric effect

Compton effect

Pair production

Any of these

None of these

Which of the following is not measured in units of energy

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Couple (angle turned through)

Moment of inertia (angular velocity)²

Force (distance)

Force (time)

The materialization of energy takes place in which phenomenon?

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Annihilation

Pair Production

Compton Effect

Photoelectric Effect

Displacement is a physical quantity, which is a

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Scalar

Vector

Variable quality

None of these

If an aeroplane moves away the radar, the wavelength reflected from is would be

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Larger

Shorter

Remains the same

None of these

The pressure will be low where the speed of the fluid is

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Zero

High

Low

Constant