Online Test

Question # 1

Two equal forces (P each) act at a point inclined to each other at an angle of 120°.The magnitude of their resultant is

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P/2

P/4

P

2P

When aluminium is added as an impurity to silicon,then resulting material is

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p-type semiconductor

p-type conductor

n-type semiconductor

n-type conductor

A pipe closed at one end and open at the other will give

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All harmonics

All even harmonics

All odd harmonics

None of the harmonics

Light year is the unit of

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Speed

Mass

Distnace

Time

When the car moves with constant accelerations, the velocity time graph is a

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Straight line

Straight line rises equally

Horizontal straight line

None of these

A body is in complete equilibrium when

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ΣF = 0

Στ = 0

SF = 0 and Στ = 0

None of these

A change when particle projected in the direction of the field experience a

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Minimum force

Maximum force

Zero

None of these

A hole is made in the bottom of a container having water field up to a height h, the velocity of water flowing out of the hole is depend on

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Independent of h

Proportional of h^1/2

Proportional to h

Proportional to h²

The modulus of elasticity can be written as

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stress x strain

strain/stress

1/2 x stress x strain

stress/strain

The concentration of red blood cells in blood is

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~ 30%

~ 40%

~ 45%

~ 50%

If one atom or molecule lies out each of the eight corners of a cube, it is called

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Simple cube

Face centered cube

Body centered cube

None of these

What will be the angular momentum in fourth orbit if L is the angular momentum of the electron in the second orbit of hydrogen atom?

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2/3 L

L/2

2L

3/2 L

The peak value of alternating current is 5√2 ampere.The mean square value of current will be:

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5 A

2.5 A

5 √2A

None of these

If the slits in YDS experiment are made closer, fringe spacing will:

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Increase

Decrease

Remain same

None of above

Why the toner is given a negative charge to the drum

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To spread over the drum

To stick the writing

To neutralize writing

None of these

If a body, under the action of a number of forces, is in equilibrium, then it is

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at rest

in uniform motion

either at rest or in uniform motion

none of them

In helium Neon Laser Neon =15% and Helium=85% used. The lasing gas in this unit is

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Helium

Neon

Both A & B

None of these

The resolving power of a grating spectrometer is

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Fraction of the decaying atoms per unit time is called

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decay atom

decay element

decay constant

decay

In order to observe the position of an electron with less uncertainty and also for minimizing diffraction effect, we must use light of

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shorter wavelength

longer wavelength

shorter frequency

none of them

IF the spinning speed of the earth is increased then the weight of the body at equator

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Does not change

Doubles

Decreases

Increases

Under normal circumstances the volume of the blood is sufficient to keep the vessels

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Inflated all the time

Deflated all the time

Contracted all the time

Squeezed all the time

The level sensor works on the basis of

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NOT gate

NOR gate

AND gate

None of these

The original source of waves is

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Moon

Sun

Wind

None of these

According to Laplace, the Boyle's law takes the form

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PV² = constant

PV³ = constant

PV^γ = constant

None of these

In petrol engine, the third stroke is the

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Intake

Power

Exhaust

None of these

The process of separation of ₉₂U²³⁵from natural uranium is called

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Enrichment

Separation

Annihilation

Fusion

The magnitude of torque is equal to the product of the force and the moment arm. The moment arm is

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The distance between the point and the point of the action of the force

The maximum distance between the pint and the line of action of the force

The minimum distance between the pivot point and the line of action of the force

All of these

SHM is type of ___________ motion

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Vibratory

Linear

Circular

None of these

A solid state detector operates under

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Forward bias

Reverse bias

Both

None of these

The range of the β-particle is more than the α-particles about

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400 times

200 times

100 times

None of these

Spectrometer can measure quite accurately prism

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Deviation of light by a glass prism

Angle of prism

Refractive index of the material of prism

None of these

At high speeds the force is no longer

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Proportional

Simply proportional

No proportion

None of these

Theγ-rays radiographs are used in

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medical diagnosis

chemical reaction

study of the digestion

none of them

The centripetal acceleration is supplied by

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Applied force

Gravity

Initial velocity

None of these

A gas is compressed adiabatically till its temperature is double. The ratio of its final to its initial volume is

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1/2

More than 1/2

Less than 1/2

Between 1 and 1/2

The inner shell transition is the phenomenon in which the electrons are emitted from

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Light metals

Metals of intermediate atomic number

Heavy metals

None of these

The capacity of a parallel plat capacitor depends on the

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Type of metal used

Thickness of plates

Potential applied across the plates

Separation between the plates

What is the unit of the Young's modulus?

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N m^-2

N m^-1

N m

N m²

The resistivity ρ of carbon in Ωm is

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3.5 × 10^-8

4.9 × 10^-8

5.00 × 10^-8

None of these

The Induced e.m.f is produced in a circuit due to:

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Initial magnetic flux through the circuit

Final management flux through the circuit

The change of magnetic flux through the circuit

None of these