Question # 1

The specific heat capacity of the body depends upon.

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the heat given to it

Mass of the body

Temperature raised

Material of the body

The direction of induced e.m.f in a circuit is in accordance with conservation of.

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Mass

Charge

Momentum

Energy

Neil Bohr made his three postulates in.

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1897

1905

1913

1921

X-rays are

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Longitudinal wave

Transvers waves

Secondary waves

Fast sound waves

Total internal reflection occurs when the angle of incidence is.

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Greater than the angle of refraction

Equal to the critical angle

Greater than the critical angle

Greater than 45^o

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

If the earth stopped rotating the weight of the object at the equator would.

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Be greater

Be same as before

Be less

Very with altitude

A 4 kJ mass of copper of specific heat capacity of 400 J kg-1k-1 is heated for 160 s by a heater of power 200 W what is the rise in temperature.

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10 K

16 K

100 K

160 K

Light from the sun reaches the earth in

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Spherical wave fronts

Cylindrical wave fronts

Plane wave fronts

Packets

Which of the following is dimensionless.

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Strain

Stress

Pressure

Volume

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

A thin layer of oil the surface of water looks coloured due to.

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Pillarization of light

Different elements present in the oil

Interference of light

Transmission of light

Birds planes and boats are streamlined to reduce

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Turbulence

Thrust

Drag

Lift

LASER is a device for

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Producing a beam of white light

Producing a beam of monochromatic and coherent light

Producing a beam of high intensity incoherent light.

Producing highly penetrating's X -rays

Who devised a technique for the measurement of change on an electron in 1909

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Milikan

Joule

Ampere

Ohm

The point midway between the lens surface on its participial axis

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Optical centre

Principal focus

Focal plane

Focal length

The pitch of sound depends on its

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Wavelength

Frequency

Wave amplitude

Harmonic content

A pendulum vibrates with a time period of 1 s which range of sound is produced by it

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Audible

Infrasonic

Ultrasonci

Super sonic

Cobalt -60 is a radioactive element with half life of 5.25 years. What fraction of the original sample will be left after 26 years.

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1/4

1/8

1/16

1/32

The emission of photons by a metal when electrons are incident is called.

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Photo electric effect

Pair production

X-rays production

Gama ray production

The sound velocity in moist air as compared to dry air will be

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More

Less

Same

zero

Which of the following pairs represent units of the same physical quantity.

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Kelvin and joule

Kelvin and calrorie

Newton and calorie

Joule and calorie

The energy transported by a wave is proportional to the square of the.

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Wavelength of the wave

Period of the wave

Amplitude of the wave

Frequency of the wave

A light beam is said to be plane polarized when

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its vibrations are restricted to only one plane

Its vibrations are very strong in one plane

Its vibrations take place in any plane

Its vibrations are very weak in one plane

Direct current generators use.

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Coiled rings

Split rings

slip rings

solenoid rings

A force applied at centre of mass of a body

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Does not produce any torque

Produces torque

Produces acceleration

Produce couple

when a body accelerates.

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Its direction always changes

Its mass always changes

Its velocity always changes

It falls towards the earth

What is term for tendency of a system to oscillate with larger amplitude at some frequencies than at others.

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Resonance

Impedance

Inductance

Capacitance

Sub atomic particles which experience strong nuclear force are.

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Leptons

Hadrons

Mesons

Quarks

In modulation, low frequency signal is called

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Fluctuated signal

Loaded signal

Modulated signal

Harmonic signal

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

Both xenon and cesium each have

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24 isotopes

28 isotopes

32 isotopes

36 isotopes

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