Question # 1

Due to which phenomenon, diamond shrines so brightly.

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Scattering of light

Refraction of light

Dispersion of light

Total internal reflection

A force of 100 N acts on body of mass 5 kg for 10 s. The velocity of the body will be.

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2 ms -1

20 m s-1

200 ms-1

2.000 m s-1

Which quantity must be the same for two bodies if they are to be in thermal equilibrium.

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Internal energy

P.E

Temperature

Mass

A bi convex lens of a material of refractive index 1.5 has the radius of curvature of each side equal to 50 cm the power of the lens will be.

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0.5 dipotre

1.0 dioptre

1.5 diopter

2.0dioptre

The hydrogen filled balloon possesses

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P.E

K.E

Heat energy

Elastic energy

The Step up transformer

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Increase the input current

Increases the input voltage

Has more turns in the primary coil

Has less time in the secondary coil

Which of the following physical quantity has different units as compared to others.

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Weight of a body

Tension of a string

Buoyant force

Electromotive force

The half life of isotopes X is four days and its initial mass is 32 mg What mass of the isotope X will remain after twelve days.

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2 mg

4 mg

8 mg

18 mg

Radio carbon in the atmosphere is produced by the bombardment of.

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Oxygen by high energy neutrons

Oxygen by high energy protons

Nitrogen by high energy protons

Nitrogen by high energy neutrons

Restoring force in the SHM is

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Centripetal

Frictional

Conservative

Non conservative

Which of the following is an electrical insulator that can be polarized by an applied electric field.

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Conductor

Condenser

Di electric

Capacitor

Which one of the following describes a measure of opposition to alternating current.

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Electrical impedance

Capacitance

Inductance

Admittance

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

The transition of inner shell electrons in heavy atoms gives rise to the emission of.

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Low energy b-particle

High energy b-particle

High energy X- rays

High energy gama rays

Which of the given factors is increased in a step down transformer.

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Voltage

Current

Wattage

Resistance

Which of the following quantity is defined in terms of the rate of change of electric displacement field.

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Conventional current

Electronic current

Displacement current

Pulsating current

A simple pendulum suspended from the celling of a lift has a time period T when the lift falls freely the time period of the pendulum will become

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Zero

T/9.8

9.8 T

Infinity

What is the energy equivalent to amu in Me V

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0.931 MeV

9.31 MeV

93.1 MeV

931 MeV

Thermodynamics concern its primary with the

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Measurement of quantity of heat

Physical effects of temperature changes

Conversion of heat into other energy forms

Behavior of gases

Blood pressure of a person

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Increases with age

Describe with age

Have no change

Stops with age

A ball is thrown straight up What is its acceleration just before it reaches the highest point.

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Zero

slightly less than g

Exactly g

Slightly greater than g

The decay to form other nuclides by emitting particles and electromagnetic radiations by unstable nuclides is called.

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Nuclear stability

Radioactivity

Carbon dating

Spontaneously

Work function is generally expressed in.

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Electron volt

Joules

Newtons

Gauss

Which of the following configuration of BJTs gives both voltage gain and current gain.

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common Base

Common Emtter

Common collector

All of the above

What is the total entropy change during an reversible cycle.

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Unity

Infinite

Zero

Cannot be detected

It is possible is distinguish between transvers and longitudinal waves from the property of.

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Refraction

Interference

Diffraction

Polarization

In annitilation of matter, positron and electron pair disappears into two

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Alpha particles

Beta particles

Game particles

X-rays

When a body is lifted through a height 'h' the work done on the body appears in the form of.

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K.E

P.E

Heat

Density

A heat engine can develop efficiency equal to 100% if the temperature of the sink is

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Less than that of source

Equal to that of source

0 K

0 ^oC

A semiconductor diode conducts only when it is

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Not biased

Zero biased

Reverse biased

Forward and biased

Which of the following is an example of irreversible process.

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Melting of ice

Work done against friction

Pettier heating and cooling

All isothermal and adiabatic changes

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