Question # 1

The loudness of a sound depends on its

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Wavelength

Frequency

Wave amplitude

Regularity

x-rays can cause fluorescence in materials such as

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Cadmium

Zinc sulphide

Palatinocyanide

All of these

Viscosity will be maximum when

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Water is at 20 ^oC

Honey is at 20 ^oC

Water is at 100 ^oC

Milk is at 100 ^oC

Arthur Holly Compton was awarded Nobel prize in.

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1923

1927

1931

1934

Which experiment confirmed the de Broglie hypothesis.

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Double slit experiment

Division germier experiment

Schrodinger's Cat experment

Bohr's experiment

An object travels at constant speed around a circle of radius 1.0 m in 1.0 s the magnitude of its acceleration is.

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zero

1.0 m s-2

2 m s-2

4 pi2 m s-2

The maximum field that a dielectric material can with stand whiteout breaking down is called its.

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Di electric strength

Magnetic strength

Capacity

Resistance

Which of the following detectors can count fast and operate at low voltage.

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G.M Counter

Cloud chamber

Solid state detector

Bubble chamber

In compound microscope, image formed by the eyepiece is

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Real

Invented

Erect

Diminished

The force on a point charge due to electromagnetic fields is called.

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Lorenz force

Gauss's force

Newton's force

Ampere's force

What kind of movement is dictated by the laws of thermodynamcis.

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Energy motion

Heat work

Light heat

Energy light

In rectifiers silicon junction diodes are preferred to germanium type because.

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They are cheaper

They are durable

Their much lower reverse current makes them more efficient

Of their geometry

When the deforming force applied on a body produces change in volume then it is said to be

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Tensile stress

Compression stress

Shear stress

Shear modulus

Which parameter is an indication of colour of a star.

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Weight

Distance

Sixe

Temperature

A 100 kg box is pulled 10 m across a frictionless horizontal surface by a 50 N force The change in the P.E. of the box a

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0 J

2 J

20 J

50 J

Under steady state the temperature of a body

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Increase's with time

Decreases with time

Does not charge with time

None of the above

Why is an oxide coated filament used in vacuum tube.

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It has a longer lime

Irt can with stand high

It emit electrons at low temperature

It reduces the effect of space charge

When of the following radiations are not emitted by electron transitions in atoms.

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Visible rays

Ultraviolet rays

Infrared radiations

Alpha particles

The ratio of stress to strain is called.

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Bulk modulus

Young's modulus

Modulus of elasticity

Shear modulus

In any collision between two bodies there need nor the conservation of

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Linear momentum

Angular momentum

Total energy

Kinetic energy

Vectors are ofhen spilt into two or more orthogonal components what is true of these components.

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they are perpendicular

They are parallel

They are antiparallel

They have same magnitude

The basic circuit element is a D.C. circuit is

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An inductor

A resistor

A capacitor

A battery

A simple astronomical telescope consists of two

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Concave lenses

Convex mirrors

Convex lenses

Plano convex lenses

On which principle the induction coil works on.

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Self induction

Ampere's rule

Mutual induction

Gauss's law

A heat engine with 100% efficiency would have to

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Do no work

Be at a uniform temperature

Use no heat

Discharge at 0^oC

When the source and observer are moving away from each other the apparent pitch will

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Increases

Decreases

Be zero

Be infinite

An electric motor could be used as a

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Battery

Capacitor

Dynamic

Transofrmer

When a charged particle is moved through a magnetic field if suffers is change in its.

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Charge

energy

Mass

direction of motion

Efficiency of a Carnot engine can never be 1 or 100% unless cold reservoir is at absolute temperature.

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0 K

100 K

273 K

373 K

A radio tuning capacitor is.

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Cylindrical capacitor

Spherical capacitor

parallel plates capacitor

Cylindrical condenser

A neutron is in head on elastic collision with a stationary nitrogen nucleus The mass of nitrogen nucleus is 14 times that of a neutron The neutrons velocity after the collision is.

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Less in magnitude than its intimal velocity

Less in magnitude than the final velocity of the nitrogen atom

Equal in magnitude to its initial velocity but in the opposite direction

Greater in magnitude than its initial velocity

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