Question # 1

In which of the following the loss of energy is less.

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Direct current

Alternating current

Thermoelectricity

Photoelectricity

The quality of a note

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Decreases with loudness

Varies directly as its pitch

Varies inversely as its pitch

Depends upon the overtones

The specific heat of an ideal gas values as

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To

T1

T2

T3

When a vector is multiplied by a negative number its direction.

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Remains unchanged

Changes by 180 ^o

Becomes horizontal

Vertical to each other

In case of a convex lens, image formed at 2 F is

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Virtual, erect and larger than the object

Real, inverted and large than the object

Real, inverted and same size as the object

Real, inverted and smaller than the object

In case of a convex lens when object is placed at 2F image is formed.

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At

2F

away from 2F

Between F at and 2 F

Density of blood a

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Equal to water

Greater than water

Less than water

zero

The minimum angle of incidence for which total internal reflection can occur is called.

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Right angle

Acute angle

Critical angle

Obtuse angle

The velocity of light was determined accurately by

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Newton

Huygen

Michelson

Young

The velocity of sound will be greater in.

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Air

Water

Solids

Vacuum

The buoyancy depends upon the

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Depth to which the body is immersed

Shape of the body

Mass of the body

Mass of the liquid displaced

A heat engine with 100% efficiency would have to.

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Do no work

Be at uniform temperature

Use no heat

Discharge of 0 ^oC

In half wave rectifier the rms value of A.C. component of the wave is.

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More than A.C. Value

Less than D.C. value

Same as that of D.C.

Not detectable

Which of the following remains unaffected in a magnetic field.

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a particles

b partciles

gama particles

Electrons

The electric heater takes a current of 4 A from a 250 V supply . How long would it take the heater to convert 400,000 J of electric energy.

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100 s

200 s

400 s

750 s

Two convex lenses of equal focal length 'f' are placed in contact, the resultant focal length is

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Zero

1

2f

f/2

Thermocouple is combination of.

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Thermocouples

Capacitors in parallel

Resistors in series

Ammeter and voltmeter

If two non zero vectors are perpendicular to each other then their scalar product is equal to.

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-1

1

0

Infinity

A capacitor is connected to a battery The fore of attraction between the plate when the separation between them is halved will

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Remain the same

Become twice

Become 4 times

Become 8 times

Which of the following is an electrostatic generator.

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Winshurst machines

Van de Graff generator

Electrophorus

All of the above

Which of the following quantity has a unit that can be expressed in terms of just two different SI base units.

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Area

Change

Electric current

Length

If we double both the current and the voltage in circuit while keeping its resistance constant the power.

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Remains unchanged

Halves

Doubles

quadruples

If D1 and D2 are the powers of two lenses placed in contact then the power of the combination will be.

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D1+D2

D1-D2

D1/D2

D1 x D2

If work must be done by an outside agent attempting tobring two point charges close together.

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They are of opposite signs

The field is not conservative

The work is recoverable when they separate

The P.E. of the charges is reduced by the amount of the work done

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

Which particle has zero charge and zero rest mass.

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Neutron

Proton

Electron

Photon

Which of the following thermometers is the most suitable for measuring rapidly varying temperature.

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Thermocouple thermometer

Mercury in glass thermometer

Alcohol in glass thermometer

Platinum resistance thermometer

For which of the following objects is the centre of mass equidistant from every point on its surface

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An unsharpened pencil

A gramophone record

An egg

A table tennis ball

Mutual inductance has a practical role in the performance of the

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Radiochoke

Transformer

Generator

Trnasistor

A negative magnification always means the the image is.

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Erect

Real

Virtual

Inverted

A double convex air bubble in water will behave as.

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Plane slab

Concave mirror

Convex lens

Concave lens

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