Online Test

Question # 1

Reverse process of vector addition is called

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Negative of a vector

Subtraction of vector

Resolution of a vector

Multiplication of a vector

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 principle of rocket motion is based on the

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First law of motion

Second law of motion

Third law of motion

None of these

The output of NAND gate is 0 when

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all the inputs are at 1

all the inputs are at 0

at least one of the inputs is at 1

none of them

Suppose the water flows out from a pipe at 3 kgs^-1and its velocity changes from 5 ms^-1to zero on striking the ball, then force is

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5.3 N

15 N

17.3 N

19.2 N

In the isothermal process one of the following is constant

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Pressure

Volume

Temperature

Heat energy

If the amplitude of simple harmonic oscillator is doubled its energy become

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Twice

Four times

Half

Six time

The reactance of a coil changes directly with

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Frequency of a.c

The inductance

Both a and B

None of these

By the slope of velocity time, we can determine the

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Acceleration

Constant velocity

Average velocity

Average acceleration

The vector product of two non zero vectors is zero when

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They are parallel to each other

They are perpendicular to each other

They are equal vectors

They are inclined at angle of 60°

The Louis de Brogile suggested a relation regarding the wave and particle duality is

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λ = h/mv

λ = m/v h

λ = vh/m

None of these

All changes which occur suddenly are irreversible through

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Conduction

Convection

Radiation

All of these

Under similar conditions of the inputs, the output of which of the following pairs of gates is inverted:

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OR and NOR

AND and NAND

XOR and XNOR

All of these

Which of the following is the most common method to obtain polarized light?

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selective absorption

reflection from different surfaces

refraction through crystals

scattering by small particles

In capacitors, energy is stored between the plates, due to

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magnetic field

electric field

emf induced

none of them

A diseased or hyperactive gland absorbs more amount than the normal thyroid gland

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Twice

Thrice

Four times

None of these

The earth satellite is a

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Navy object

Revolving object

Accelerating object

Free falling object

Static electricity is produced by the transfer of:

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Electrons

Protons

One fluid

Two fluid

None of these

Consider electron and photons of the same wave - length then will have the same

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Energy

Velocity

Momentum

Angular momentum

Thermocouples convert heat energy into

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Mechanical energy

Chemical energy

Electrical energy

None of these

Torque acting on a particle with respect to origin is given by

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The power of a pump motor is 2 kilowatt.The water raised by the pump per minute to a height of 10 m is nearly

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500 kg

7000 kg

1200 kg

Zero

The conventional current is the name given to current due to flow of:

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Positrons

Positive charges

Negative charges

Both A and C

None of these

A perfect absorber must also be perfect:

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Cavity

Source of radiation

Radiator

None of them

The kinetic energy of electron (in electron volt),moving with the velocity of 4 x 10⁶ m/s will be

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30 eV

45 eV

50 eV

60 eV

The period of a satellite when there is critical velocity is

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80 min approx

84 min approx

82 min approx

90 mix approx

If the binding energy of an element is 9.31 MeV the mass defect given in amu is

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-0.0024

-0.0012

0.0012

0.01

Shear modulus for steel is

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20

84

95

202

Which of the following behaves as a bar magnet

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A long wire carrying current

A solenoid coil carrying current

None of a and b

A particle moving in a magnetic field has increase in its velocity then its radius of the circle

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Decreases

Increases

Remains the same

Becomes half

Electrons

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Can exit inside the nucleus

Cannot exit inside the nucleus

Can exit both inside and outside the nucleus

None of the above

In R.L.C. parallel circuit, the applied voltage is

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Out of phase

In phase

Remains the same

None of these

Sonar is the name of technique or detecting the presence of objects under water by

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Eco-ranging

Eco-sounding

Eco-acoustical

All of these

The equations for uniformly accelerated motion for body moving at

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Acceleration

Constant acceleration

Instantaneous acceleration

None of these

By increasing negative potential on grid in CRO the brightness will

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Inceases

Decreases

Remains same

None of these

Electrons move in the field from

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Low to high potential

High to low potential

Electric field to magnetic field

None of these

In case of linear deformation, the ratio of the tensile stress to the tensile strain is called

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Young's modulus

Bulk modulus

shear modulus

all of them

In the theory of dimensional analysis, heat may be properly represented by:

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ML²T^-2

MT^-2

ML^-1T^-1

None of these

In case of p-n junction diode,at high value of reverse bias,the current rises sharply.The value of reverse bias is known as:

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Cut off voltage

Threshold voltage

Inverse voltage

Critical voltage

Bulk modulus for aluminium is

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40

70

75

95

The torque per unit twist of a coil is called

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proportionality constant

gravitational constant

boltzman constant

coupling constant