Online Test

Question # 1

Which one of the following is undeflected by electric or magnetic field?

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Electrons

β-particles

α-particles

γ-radiations

Which one of the following elasticities is possessed by fluids:

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Young's elastic modulus(length)

Bulk elastic modulus(volume)

Modulus of rigidity (shape)

None of these

Which component of weight balance the tension T in the string

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mg cos θ

mg sin θ

- mg cos θ

None of these

One tesla is equal to

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1 Nm A^-1

1 Na^-1m^-1

1 Nm^-1A

None of these

In a semi-conductor material, current flows due to

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positive charge

negative charge

both of them

none of them

The particles equal in mass or greater than protons are called

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baryons

quarks

leptons

mesons

In the study of interference and diffraction, we consider

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plane waves

plane wavefronts

both of them

none of them

In LCR circuit which one of the following statements is correct?

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L and R oppose each other

R value increase with frequency

The inductive reactance increases with frequency

The capacitive reactance increases with frequency

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

A 50 kg man is falling freely force acting on it will be

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5 N

50 N

500 N

zero

Work done by centripetal force is

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Maximum

Minimum

Zero

None

A two input NAND gate with inputs A and B will be zero iff:

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A is zero

A=0, B=-1

both are zero

both are one

After elastic limit the shape of graph is

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Curved

Straight Line

Saw tooth

Arbitrary

How many times the radius of the atom is larger than the radius of the nucleus

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10³

10⁵

10⁷

None of these

The entire positive charge of the atom and mass of the atom is concentrated in the nucleus is

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80%

90%

99.9%

None of these

The charge moving perpendicular to the magnetic field 'B' with a certain velocity 'v' experiences

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No Force

Maximum Force

Minimum Force

None of these

The maximum drag force on a falling sphere is 9.8 N,it weight is

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1 N

9.8 N

4.9 N

Cannot be calculated

Which of the following is the relation of centripetal force?

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mv²/r

mv/r

mv³/r

mv³/r³

Angular frequency 'ω' is basically a characteristic of

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Simple Harmonic motion

Angular motion

Oscillations

None of these

The expression F x t is called impulse if the time 't' is

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zero

very large

very small

infinite

In petrol engine, the third stroke is the

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Intake

Power

Exhaust

None of these

What are the base units of Planks constant h Remember the energy of a photon is given by hf where f element the frequency

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kgms^-1

kgm²s^-1

kgm²s^-2

kgm²s^-3

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

In the Wilson's cloud chamberα- andβ- particles are detected. What is seen in the chamber whenα-particles are let into the chamber?

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long straggly paths

long continuous straight trials

short continuous straight trails

short straggly paths

If band gap between valence and conduction band material is 5 eV. The material is

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Insulator

Good conductor

Semiconductor

Such material are not exist

The ultimate tensile strength (UTS) can be regarded as the

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Maximum strength of the material

Nominal strength of the material

Minimum strength of the material

None of these

In this pressurized water reactor water is

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Prevent from boiling

Kept under high pressure

Hot water used to produce steam

All of these

Velocity of a body changes if

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direction of motion the body changes

speed of the body changes

neither speed nor direction changes

either speed or direction changes

Angle between ray of light and the corresponding wavefront is:

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0°

60°

90°

120°

For a motor which is over loaded the magnitude of back emf

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becomes zero

get decreased

get increased

remains constant

If a liquid is heated in weightlessness,the heat is transmitted through:

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Conduction

Convection

Radiation

Neither because the liquid cannot be heated in weightlessness

What is the Young modulus of a meta?

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Extension/force

Force/extension

Strain/stress

Stress/strain

Electrical energy is measured in:

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Watt

Horse power

Kilo watt

Kilowatt hour

The Bernoulli's equation often expressed in

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Which of the circuit element permit the flow of alternating current but not the direct current

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Resister

Capacitor

Inductor

Both inductor and capacitor

Which of the following is conserved when light waves interfere

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Intensity

Energy

Amplitude

Momentum

The energy of the γ-rays more than 1.02 MeV the dominant process is

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Compton effect

Pair production

Photo electric effect

None of these

A magnet can be demagnetized by

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Heating

By dropping it several times

Breaking into two pieces

Both heating and by dropping it several time

The force experienced by a charge particle is zero, when the charged particle is projected at

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θ = 0

θ = 90°

θ = 180°

θ = 60°

Rutherford in 1918, bombarded α-particle on nitrogen and obtained

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Oxygen and deuterium

Oxygen and proton

Oxygen and tritium

None of these

Of the following thermometer, the one which can measure temperature from distance is

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Platinum thermometer

Gas thermometer

Vapour pressure thermometer

Pyrometer