Online Test

Question # 1

For transmission of both transverse and longitudinal waves, we can use:

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Solid

Gas

Plasma

None of these

For the structural analysis of the crystal, X-rays are used because

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X-rays have wavelengths of the order of interatomic spacing

X-rays are highly penetrating radiation

Wavelength of X-rays is of the order of nuclear size

The wavelength of X-rays is of the order of 546 nm

CT scanning is the abbreviated name of

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Computed Technology

Computed Technique

Computed Technology

Computerized Axial Tomography

Two pipes one is open end other is closed at one end are of same length then the ratio of their fundamental frequencies is

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1 : 2

2 : 1

1 : 1

1 : 4

In a laminar flow of non-viscous fluid along a horizontal pipe,the work done per second by the pressure at any section is equal to

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The pressure

Pressure x volume per second

Pressure x area of cross-section

Pressure x volume

Tick the correct statement:

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Both the potential and potential difference are scalar

Potential is a scalar but potential difference is a vector

Both are vectors

Potential is a vector but potential difference is a scalar

None of these is correct

In depletion region

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Holes are not present

Electrons are not present

Both are not present

None of these

When mass m = 0.50 kg and spring constant K = 245 kgs^-2. Find the time period of the system

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0.12 sec

0.20 sec

0.28 sec

0.29 sec

The aim of CT scanning is to

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make a 3-dimensional image

make an image of a section through the body

make an image of a section through the body from measurements taken about its axis

all of them

If a particle of a medium is simultaneously acted upon by 'n' waves then its resultant amplitude is

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the difference of these n waves

the sum of these n waves

half of the difference of these n waves

half of the sum of these n waves

The work done on the system by the environment is taken as

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Positive

Neutral

Negative

None of these

Which one of the following particles moving in the magnetic field cannot be deflected?

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neutrons

β-particles

α-particles

electrons

The following expression represent

ΔU = -W

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Isothermal expansion

Isobaric process

Adiabatic compression

None of these

When an element X emits gamma-rays, its atomic number Z

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Increases by 1

Decreases by 1

Remains same

None of these

The principle of potentiometer is given by

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V ∞ I

V ∞ 1/I

V ∞ I/E

Radioactive was discovered in

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1820

1875

1896

1906

How many kinds of laser are there?

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Solid only

Liquid only

Gaseous only

All of these

Speed of efflux increases if

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Distance of hole from surface of water increases

Distance of hole from bottom decreases

Independent of distance of hole from surface

Both a and b

In petrol engine, the first stroke is the

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Power stroke

In take stroke

Exhaust stroke

None of these

The difference in angular momentum associated with the electron in the two successive orbits of hydrogen atom is

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h/π

h/2π

h/2

(n-1) h/2π

The practical use of services by optic fiber is

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Two way television

World processing

Image transmitting and receiving equipment

All of these

Dielectric has the charge of the type inside it

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Moving charge

Static charge

Both a & b

None of these

In carbon colour coded resistances, if there is no fourth band, then it is understood that the tolerance is

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± 50 %

± 40 %

± 30 %

± 20 %

The sequare root of 0.4 is____:

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Greater than 0.4

Smaller than 0.4

Equal to 0.4

None of them

A particle executes SHM with frequency f. The frequency with which its K.E. oscillates is

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f/2

2f

f

4f

The emf produced by the motion of a coil across a magnetic field is called

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Induced emf

Self induced emf

Motional emf

emf

α-particle is absorbed by

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1 mm sheet of copper

A paper

Lead sheet of 1 cm

None of these

An ideal voltmeter would have an infinite

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Current

Voltage

Resistance

None of these

If the distance between two charges is doubled, the force between them will become:

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Double

Half

Three times

One fourth

One third

The location and speed any where on earth can now be determined to an accuracy of about

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100 cms^-1

50 cms^-1

30 cm^-1

2 cm^-1

An airplane is flying horizontally with a velocity of 600 km/h and at a height of 1960 m.When it is vertically above a point A on the ground a bomb is released from it.The bomb strikes the ground at point B.The distance AB is

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1200 m

0.33 km

3.33 km

33 km

The linear momentum of the body is defined as

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p=ma

p=1/2ma

P= mv

p=1/2mv

A driver in a lake wants to signal his distress to a person sitting on the edge of the lake flashing his water proof torch He should direct the beam

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Vertically up wards

Horizontally

At angle to the vertical which is slightly less than the critical angle

At an angle to the vertical which is slightly more than critical angle

The number of isotopes of hydogen are

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2

1

3

4

A boy is dropped from a tower with zero velocity, reaches ground in 4s. The height of the tower is about

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80 m

20 m

160 m

40 m

The quenching of gas by a quenching gas is called

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Quenching

Self quenching

Forced quenching

None of these

The angular momentum of the orbital electron is integral multiple of:

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h

2πh

h/2π

For which position will be maximum blood pressure in a body have the smallest value

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Standing upright

Sitting relaxed

Lying horizontally

Standing on one's head

Which of the following is the smallest unit?

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Millimeter

Angstrom

Fermi

Metre

Carbon resistors consist of a high-grade ceramic rod or con called the

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rheostat

tolerance

substrate

resistor

The amount of charge passing through a wire in certain interval of time is 1.6 pico coulombs. The number of electrons are then:

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10⁷

10¹⁵

10¹⁰

10¹⁶

None of these