Question # 1

Inertia mass and gravitational mass are

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opposite

identical

identical when there is no friction

all of them

When the mass of the colliding body is much larger than the mass of the body at rest, its velocity after collision.

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Becomes half

Becomes zero

Ramains same

Becomes double

Wave nature of particle was proposed by

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Einstein

Plank

De-Brogile

Max well

In an elevator moving vertically up with an acceleration 'g' the force exerted on the floor by a passenger of mass M is

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Mg

1/2 Mg

Zero

2 Mg

The photon of radio-waves has energy of about

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1 Me V

1 Ke v

10^-10e v

10¹⁰e v

When two progressive waves of nearly same frequencies superimpose and give rise to beats, then

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Frequency of beat changes with time

Frequency of beat changes with location of observer

All particles of medium vibrate simple harmonically with frequency equal to the difference between frequencies of component waves

Amplitude of vibration of particles at any point changes simple harmonically with frequency equal to difference between two component waves

In bringing an electron towards another electron, electrostatic potential energy of system

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Decreases

Increases

Remains uncharged

Becomes zero

When a mass 'm' is pulled slowly, the spring stretches by an amount x_o, then the work done will be

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W=Kx_o

W=1/2Kx_o

W=1/2Kx²_o

W=4Kx_o

At ordinary temperature, an increase in temperature increases the conductivity of

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Conductor

Semiconductor

Insulator

Alloy

According to slok's law, drag force depends on

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Radius of the spherical body

Terminal velocity of body

Coefficient of viscosity

All of above

Conversion of A.C. into D.C. is called:

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Reftification

Amplification

Electric induction

Magnetic induction

None of these

A metal road of length 1m is moving at a speed of 1 ms^-1In a direction making angle of 30º with 0.5 Y magnetic field. The emf produced in the rod is:

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0.25 N

0.25 V

2.5 V

2.5 N

25 V

A ball is dropped from a height of 4.2 meters. To what height it will rise if there is no loss of KE after rebounding?

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4.2 m

8.4

12.6

None of these

An object undergoes S.H.M has maximum acceleration when its displacement form the means position

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maximum

zero

half of the maximum value

one third of the maximum value

In n-p-n transistor, emitter base junction is kept

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reversed

forward biased

may be reversed or may be forward biased

none of these

An object thrown in arbitrary direction in space with an initial velocity and moving freely under gravity will follow

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a circular path

a straight line

a hyperbola

a parabola

When a platinum wire is heated, it appears dull red at about

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500°C

900°C

1100°C

1300°C

Two projectiles are fired from the same point with the same speed at angles of projection 60° and 30° respectively. Which one of the following is true?

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Their range will be same

Their maximum height will be same

Their landing velocity will be same

Their time of flight will be same

Which of the following represents an electric current?

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C^-1

CS^-1

J.S^-1

dynes^-1

Alfa particles are

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hydrogen nuclei

helium nuclei

electrons

photons

SI unit of impedance is

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hertz

henry

ampere

ohms

When temperature increase, the frequency of a tuning fork

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Increases

Decreases

Remains same

Increase or decreases depending on the material

Tesla is the unit of

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Magnetic induction or flux density

Magnetic flux

Self inductance

None of these

Where the streamlines are very far apart from each other, the pressure will be

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low

zero

high

all of them

A fluid at a certain point has 50 J of potential energy per unit volume, 75 J of kinetic energy per unit volume,and 35 J of pressure energy per unit volume. the total energy of the fluid is

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125 J

90 J

160 J

85 J

Which of the following is not an assumption of kinetic energy

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a finite volume of gas consists of very large number of molecules

the gas molecules are in random motion

collision between the gas molecules are inelastic

the size of the gas molecules is much smaller than the separation between molecules

A diode which can turn its current ON and OFF in nono seconds is called:

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LED

Photodiode

An ordinary diode.

Both (A) and (B)

Both (B) and (C)

Victor de-Brogile received the Nobel prize in physics in

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1925

1929

1932

1935

The concept of field theory was put forward by

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Franklin

Kepler

Oersted

Michael Faraday

For a moving body, at any instant of time

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If the body is not moving the acceleration is necessarily zero

If the body is slowing, the retardation is negative

If the body is slowing, the distance is negative

If displacement, velocity and acceleration at that instant are known, we can find the displacement at any given time in future

The velocity of sound at same temperature is maximum in

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H₂

N₂

O₂

NH₃

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