Question # 1

The magnetic force exerted on an electron moving with velocity 'v' at right angle to the magnetic field is given by

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F=eVB

F=e²V/B

F=e/VB

F=B²/ev

In order to make a voltmeter, high resistance is connected with galvanometer, in

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perpendicular

may be paralled or pendicular

series

none of these

A body of weight 1 N has a kinetic energy of 1 joule when its speed is:

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1.46 m sec^-1

2.44 m sec^-1

3.42 m sec^-1

4.43 m sec^-1

Tick the conservation force:

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Tension in a string

Air resistance string

Elastic spring force

Frictional force

Which of the following statements for an object in equilibrium is not true?

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The object must be at rest

The object can be at rest

The object is moving at constant speed

The acceleration of the object is zero

Work done is lowering the bucket into the well is:

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Zero

Positive

Negative

None of these

The electric flux from a closed surface

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Is independent of the shape of the surface

Depends on the charge enclosed by the surface

Both a and b

None of the above

The half lie of radium-226 is

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238 years

4.5 x 10⁹days

1620 years

332 years

Amplitude is the displacement of the vibrating body from:

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One extreme position to the other extreme position

Mean position any one extreme position

Both A and B are correct

None of these

Consider a photon of continuous X-ray and a photon of characteristics X-ray of same wavelength. Which of the following is/are different for the two photons

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Frequency

Penetrating power

Energy

Method of creation

A full-scale deflection is obtained in a galvanometer with a current of few

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ampere

volts

milliampere

ohm

Relativistic mechanics was developed by

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Davison and Germer

Heisenberg

Max Planck

Albert Einstein

A particle is acted upon by a force of constant magnitude which is always perpendicular to the velocity of particle.the motion of the particle takes place in a horizontal plane.It follows

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Linear momentum is constant

Velocity is constant

It moves in a circular path

None of these

According to Bernoulli s theorem velocity and pressure

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Are directly proportional

Are inversely proportional

Have no relation

Are equal

The typical speed of 100 meters dash

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2 ms^-1

4 ms^-1

10 ms^-1

12 ms^-1

Bulk modulus for tungsten is

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50

100

150

200

The motion of molecules in gases i:

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Orderly

Random

Circular

All of these

When a strength changes the length of a body,it is called

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Tensile stress

Shear stress

Compressional stress

Two row boats moving parallel in the same direction and pulled toward each other due to the application of Bernoulli's equation

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Stake's theorem

Toricelli's theorem

Venturi relation

None of these

The index of refraction of diamond is 2.0 velocity of light in diamond in m/s is

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6 x 10⁸

3 x 10⁸

2 x 10⁸

1.5 x 10⁸

G.P Thomson revealed:

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Particle nature of electron

Dual nature of electron

Wave nature of electron

Electromagnetic nature of electron

For maximum horizontal range, the angle of projection must be:

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0°

45°

60°

90°

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