Question # 1

The waves in which the particles of the medium are displaced in a direction perpendicular to the direction of propagation of waves are known as

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longitudinal waves

transverse waves

non-mechanical waves

none of them

According to kinetic theory of gases, molecules of a gas behave like

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Inelastic spheres

Perfectly elastic rigid sphere

Perfectly elastic non-rigid spheres

Inelastic non-rigid spheres

According to Huygen's principle

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light travels in straight line

Light is a transvers wave

Light has dual nature

All points on the primary wave-front are the sources of secondary wavelets

Magnetic lines of force:

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Cannot intersect at all

Intersect at infinity

Intersect within magnet

Intersect at Neutral Point

None of these

Silicon can be obtained from

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Lead

Uranium

An isotope of oxygen

Sand

Semi-conductor elements have atoms with

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2 valence electrons

3 valence electrons

4 valence electrons

5 valence electrons

A rheostat can e used:

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As variable resistor

As potential divider

For varying the current

All of these

None of these

Which of the following is an example of a S.H.M?

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motion of a projectile

motion of a train along a circular path

motion of swing

electrons revolving sound the nucleus

One complete round trip of the body about its mean position is called

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displacement

vibration

a complete motion

an acceleration

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

The bicycle pump provides a good example of

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first law of thermodynamics

second law of thermodynamics

third law of thermodynamics

none of them

Rain drops are spherical because of

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Gravitational force

Surface tension

Low viscosity of water

Air resistance

If stress is increased beyond the elastic limit and change in solid is permanent this behaviour is called

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Elasticity

Plasticity

Conductivity

Insulator

The Bernoulli's equation often expressed in

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P + ρV² + ρgh = constant

P + 1/2 ρV + ρgh = constant

P + 1/2 ρV² + ρgh = Constant

P + 1/2 ρV² + gh = constant

The angle between two vectors -2î + 3ĵ + k̂ and î + 2ĵ-4k̂ is:

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0°

90°

180°

None of the above

An elevator weighing 3.5 × 10⁶ N raised to a height of 100 m in the absence of friction the work done is

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3.5 × 10³ J

3.5 × 10⁴ J

3.5 × 10⁶ J

3.5 × 10⁹ J

Viscosity of plasma at 30^oC in Nsm^-2

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1.6 × 10^-3

1.595 × 10^-3

1.67 × 10^-3

1.69 × 10^-3

The retarding force of the stream of water on a motor boat moving with a uniform velocity of 30 ms^-1is 5000 N The power of motor boat is

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1.50 kw

15 kw

105 kw

150 kw

The distance between the centres of two consecutive bright fringes (or dark fringes) is called

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wavelength

fringe width

amplitude

path difference

The minimum distance between a source and the screen for which a real image is possible with a convex lens is

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Its focal length

Twice the focal length

Four times the focal length

Square of the focal length

Stress is defined in terms of:

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Applied force

Deformation

Formation

Any of these

None of these

When a movable mirror moves λ/4 distance and the light used is 400 nm, then the distance measured highly precise is

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100 nm

10^-4 nm

10^-6 nm

10^-5 mm

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