Question # 1

A boat loving at constant speed 'v' through still water experiences a total frictional drag F what is the power developed by the boat.

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1/2 Fv

Fv

1/2 Fv2

Fv2

An alternating current can be produced by

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Turbine

Electric motor

Generator

Trnasormer

Which of the following is invariant under Galilean transformation.

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Velocity

Impulse

Momentum

Distance

A solid state detector is basically

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A reverse biased p-n junction

A forward biased p-n junction

A p-n -p transistor

A n-p-n transistor

When a solid is melting the temperature remains constant even through heat is being supplied because the

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Heat is being used to break up the intermolecular bonds

Solid is not absorbing any heat

Molecules are moving faster

Molecules are farther a part

The value of critical angle of glass is

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45^o

42^o

48^o

52^o

When a positive charge is allowed to move from positive to negative plate, then it will gain

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P.E.

K.E

Gravitational energy

Electrical P.E.

On which parameter internal energy of an ideal gas depends upon.

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Volume

Mass

Pressure

Temperature

Why should household appliances be connected in parallel with the voltage source.

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To increase the resistance of the circuit

To decreases the resistance of the circuit

To provide each appliance the same voltage as the power source

To provide each appliance the same current as the power source.

The maximum energy of photons emitted from ab X rays tube is certain to be increased by

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Increasing the voltage across the tube

Decreasing the voltage across the tube

Heating the metal target

Putting a barrier in the way of photons

Two bullets a and b have masses 1 kg and 12 kg respectively.

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K.E. of B will be twice that of A

K.E. of A will be twice that of B

Both have same K.E.

K.E. of A will be half that of B

The strength per unit volume of a solid is called.

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shear stress

Shear strain

Bulk strength

Bulk modulus

In case of a convex lens when object is placed away from 2F, image is formed.

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at F

at 2F

away from 2 F

Between F and 2 F

The process of mixing sound waves with carrier waves is known as.

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Rectification

amplification

Modulation

Demodulation

A bus and a car moving with the same K.E. are acted upon by the same retarding force then the

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car will stop first

Bus will stop first

Both will stop simultaneously

Both will never stop

In scientific notation 0.0003 can be written as.

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3 x 10⁴

3 x 10^-4

3.0 x 10³

3.0 x 10^-3

A deuteron is

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A type of proton

A proton neutron bounded to gather.

A type of beta particle

A type of neutron

The consumption of energy by a 60 W bulb in 2 s is

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0.02 J

30 J

60 J

120 J

A man in an elevator descending with an acceleration will conclude that his weight has

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Increased

Decreased

Constant value

Zero value

Natural radioactivity was discovered in.

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1978

1896

1904

1906

The vertical component of earth's magnetics field is zero.

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At magnetic poles

At geographical poles

At magnetic equator

Everywhere

If an athlete uses 50 J of energy to lift a load in 2 s his muscular power is.

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125 W

250 W

500 W

1,000 W

What is generated when air moves an air foil.

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Thrust

Lift

Drag

Turbulence

The band of colours is called.

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Spectrum

Prism

Medley

LASER

Which instrument measures the magnification of a telescope.

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lactometer

dynamometer

Wattmeter

Ammeter

Difference between Cp and Cv is equal to

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General gas constant

Planck's conatant

Molar gas constant

Boltzmann's constant

The fluid which is incompressible and non viscous is called.

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Viscous fluid

Nonideal fluid

Ideal fluid

Perfect fluid

The relation between refractive index an critical angle is.

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sin C =1/n

sin n = 1/C

sin c = 1

n = sin C

Which of the following is dimensionless.

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Strain

Stress

Pressure

Volume

Who suggested that energy is radiated or absorbed in discrete packers called quanta.

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Max. Planck

Stefan

Lummer

Boltzmann

Which are different types of emission spectrum

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Continues spectrum

Line spectrum

Band spectrum

all of the above

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