Question # 1

The minimum wavelength of the X-rays produced by electrons accelerated through a potential difference of V volts is directly proportional to

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√V

V²

1/√V

1/V

What will be the duration of the day and night (in hour) if the diameter of the earth is suddenly reduced to half its original value the mass remaining constant?

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12

6

3

2

In which region of electromagnetic spectrum does the Lyman series of hydrogen atom lie

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Ultraviolet

Infra red

Visible

X-ray

The product of the pressure and volume of an ideal gas is

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A constant

Approximately equal to the universal gas constant

Directly Proportional to its temperature

Inversely proportional to its temperature

The time period of a simple pendulum is 2 seconds if its length is increased by 4 times then its period becomes

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16 s

12 s

8 s

4 s

The henry is the unit for

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Resistance

Magnetic flux

Magnetic field

Inductance

Which of the modulus of elasticity is involved in compressing a rod to decrease its length?

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Young's modulus

Bulk modulus

Modulus of rigidity

None of the above

The modulus of rigidity of a liquid is

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Zero

1

Infinity

A value not one of those mentioned above

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

In a simple harmonic motion (SHM) which of the following does not hold?

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The force on the particle is maximum at the ends

The acceleration is minimum at the mean position

The potential energy is maximum at the mean position

The kinetic energy is maximum at the mean position.

The excess (equal in number) of electrons that must be placed on each of two small spheres spaced 3 cm apart. with force of repulsion between the spheres to be 10^-19 N is

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25

225

625

1250

Band spectrum is produced by

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H

He

H₂

Na

The volt/metre is the unit of:

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Potential

Work

Force

Electric field intensity

The length of a telescope is 36 cm. The focal lengths of its lenses can be

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30 cm, 6 cm

-30 cm, -6 cm

30 cm, -6cm

-30cm, 6cm

A body of mass 2 kg is thrown up vertically with K.E. of 490 joules. If the acceleration due to gravity is 9.8 m/s², the height at which the K.E, of the body becomes half its original value is given by:

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50 m

12.5 m

25 m

10 m

The mass defect for the nucleus of helium is 0.0303 a.m.u. What is the binding energy per nucleon for helium in MeV?

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28

7

4

1

Bernoulli's equation is based upon law of conservation

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Mass

Momentum

Energy

None of these

The dot product of two vectors is negative when

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They are parallel vectors

They are anti-parallel vectors

They are perpendicular vectors

None of the above is correct

The time period of a simple pendulum is 2 seconds. If its length is increased by 4 times, then its period becomes

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16 s

12 s

8 s

4 s

If a diamagnetic substance is brought near north or south pole of a bar magnet it is

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Attracted by the poles

Repelled by the poles

Repelled by north pole and attracted by the south pole

Attracted by the north pole and repelled by the south pole

What is the average energy of N molecules of monoatomic gas?

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1/2 NKT

NKT

3/2 NKT

5/2 NKT

Centre of mass is a point

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Which is geometric centre of a body

From which distance of particles are same

Where the whole mass of the body is supposed to be centered

Which is the origin of reference frame

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