Question # 1

The efficiency of carnot engine cannot be 100% or one unless cold reservoir is at

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100 K

273 K

0 K

-273 K

A car is moves around a circular track of radius 0.3 m at the rate of 120 rev/min. The speed v of the car is:

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38 m/sec

3.8 m/sec

0.6 m/sec

None of these

The velocity of sound at same temperature is maximum in

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H₂

N₂

O₂

NH₃

A magnifier gives an image which is:

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Virtual, inverted

Real, erect

Virtual, erect

Real, inverted

Gaussian surface is always:

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Rectangular

Spherical

Cylinder

Box shape

Any of these

A vector of magnitude 5 N is added to a vector of magnitude 8 N while the orientations are changeable. Range of their possible sum will be very from:

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Zero to 3 N

1 N to 13 N

13 N to 3 N

None of these

If speed of electron is 5 x 10⁵m/s. How long does it take one electron to transverse 1 m?

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1 x 10⁶

2 x 10⁶

2 x 10⁵

1 x 10⁵

The body passing a viscous medium affected by:

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One force only

Two forces only

Four forces

None of these

Energy stored in the spring of a watch is called

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Potential energy

Kinetic energy

Nuclear energy

Elastic potential

Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of

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photoelectric effect

pair production

Compton effect

uncertainty principle

Radioactivity was discovered by

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Rutherford

Henri Becqureal

Maxwell

James Chadwick

A particle of mass 'm' at rest is acted upon by a force 'P' for a time 't' its kinetic energy after an interval 't' is

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P²t²/m

P²t²/2m

P²t²/3m

Pt/2m

Which is having minimum wavelength?

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X-rays

Ultra-violet rays

Y-rays

Cosmic rays

The constant K in Coulomb's Law depends upon

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Nature of medium

System of units

Intensity of charge

a & b

When a plane polarized light is passed through certain crystals they

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Are totally absorbed

Are totally reflected

Rotate the plane of polarization

None of these

According to Huygen,every point on a wavefront may be regarded as a.........of secondary wavelets.

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Base

Source

Producer

Origin

The velocity of a particle at an instant is 10 m/s and after 5s the velocity of the particle is 20 m/s.The velocity 3s before in m/s is:

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8

4

6

7

When a stress changes the shape, it is called the

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compressional stress

tensile stress

shear stress

any one of them

Water is flowing through a pipe under constant pressure. At some place, the pipe becomes narrow, the pressure of water at this place

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Increases

Decreases

Remains same

Depends upon several factors

The energy due to all the fossil fuels on the Earth is so small that, the energy reaching Earth in just days of sunlight which is

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5 days

10 days

30 dyas

60 days

The band full of electrons, which donot play any part in the conduction process is known as

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Conduction band

Forbidden energy band

Valence band

Completely filled band

The fibre core has constant refractive index such as

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1.48

1.5

1.52

1.56

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