Question # 1

Heavy water is made of one oxygen atom and two atoms of:

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Protium

Deuterium

Tritium

Any of these

None of these

A vector which has magnitude 'one' is called:

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Resultant vector

A unit vector

Position vector

None of these

Radian is defined as the angle subtended at the center of a circle by an arc of:

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Length equal to its diameter

Length equal to its radius

Any length

None of these

A curie represents a very strong source of

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α-particle

β-particle

γ-particle

none of these

In SHM, the acceleration is ______ when velocity is _____:

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Zero, smallest

Smallest, zero

Zero, zero

Zero, greatest

Majority charge carriers in the p-region of p-n junction are:

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electrons

positrons

Holes

Neutrons

None of these

The unit of resistivity is

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ohm

ohm-m²

ohm-meter

ohm-m^-1

The percentage of available heat energy converted into work by a petrol engine is roughly

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35 %

40 %

35 to 40 %

25 %

Work done along a closed path in a gravitational force is:

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maximum

Minimum

Zero

Unity

During the steady flow, different streamlines

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cannot across each other

can across each other

either of them

neither of them

The vertical and horizontal range will be equal id angle of projection is

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76°

45°

60°

120°

In Michelsons interference the movable mirror is moved and a shift of two fringes is observed then the distance moved by the mirror is

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λ/2

λ

2λ

None

A spectrometer is used to find

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Wavelength of light

Refractive index of the prism

Angle of minimum deviation of prism

All of these

The value of young's modulus is maximum for:

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Dimond

Copper

Ice

Mercury

Water

When a silicon crystal is doped with a pentavalent element, then the atom of the pentavalent element is known as

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acceptor

donor

either of them

none of them

For the angle of projection of a projectile for which its maximum height and horizontal range are equal

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50^o

45^o

60^o

76^o

A double convex lens act as a diverging lens when the object is

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Inside the focus

Between f and 2f

At the focus

At a large distance

The stress which increase the length in one dimension only is called

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length stress

only have compressive stress

Have both tensile and compression stress

None of them

The velocity of flow of a liquid through an orifice at the bottom of a tank depends upon the

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Density of liquid

Cross sectional area of orifice

Height of liquid above the orifice

None of there

A body falling freely under the action of gravity has

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Constant weight

Variable weigth

Maximum weigth

No weigth

Which row is correct for fission and for fusion?

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Produces larger nuclei

Produces smaller nuclei

A polarizer is used to

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Reduced intensity of light

Produce polarized light

Increase intensity of light

Produce unpolarised light

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