Question # 1

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.

A diode cn be used as

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Amplifier

Rectifier

Oscillator

Transistor

Which uranium isotope having the atomic weights as given below is easily fissionable.

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234

235

236

238

When transistor works as an amplifier, its output is.

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More

Less

Zero

Directly proportional to the input

The instantaneous voltage across a pure inductance.

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Leads the current by 90 ^o in phase

Lags the current by 90 ^o in phase

Is in phase with the current

Leads the current by a phase angle which depends on the frequency

If we place oure hand below a lighted lamp we feel warmer due to.

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Conduction

Convection

Radiation

None of these

The device in the circuit that consume electrical energy are known as.

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Resistors

Capacitors

Fuses

Load

Charge carriers in thermocouples are.

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Anions

Cations

Electrons

Protons

What does a dynamo generate

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Electrons

Emf

anion

Cation

Which of the following form of electromagnetic energy has the highest frequency.

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X rays

Game rays

Ultraviolet waves

Infrared waves

The angular speed of an electron in the nth orbit of Bohr's hydrogen atom is.

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Directly proportional to n

Directly proportional to n2

Inversely proportional to n

Inversely proportional to n2

Which of the following is invariant under Galilean transformation.

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Velocity

Impulse

Momentum

Distance

Certain gas are called permanent gases because.

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They cannot be liquified

They are perfect gases

The critical temperatures are low

their boiling points are low

What is the amount of mechanical work done to melt 1 g of ic completely

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4.2 J

42 J

80 J

336 J

Which quantity provides a quantitative measure of disorder.

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Entropy

Enthalpy

Randomness

Chaos

What makes the air coming out of a punctured tyre cool.

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Isothermal expansion

Adiabatic expension

Flow at high speed

Atmospheric pressure

Which quantity remains fixed in isobars.

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Mass number

Atomic number

Number of neutrons

Number of protons

Who proposed that light energy travels in space by means of wave motion.

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Maxwell

Planck

De-Broglie

Huygen

The study of atomic structure of crystals by x rays was initiated by.

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Mosely

Young

Huygen

Bragg

What information is given by the tangent to a field that point of electric field.

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Magnitude

Direction

Proper unit

Dimensions

Which one of the following has maximum frequency.

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Visible light

Gama rays

Ultraviolet rays

Infrared rays

The impedance of the circuit at resonance frequency is

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Minimum

Maximum

Zero

Infinity

Which is the correct statement regarding the nature of light.

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It has wave nature

It has particle nature

It has both wave and particle nature at the same time

It has wave nature sometime and particle nature at some other time.

An A.C. dynamo operates on the principle of

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Mutual induction

Self induction

Electromagnetic induction

Mechanical induction

The weight of a man in an elevator moving down with an accelerating of 9.8 m s-2 will be come

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Half

Zero

9.8 N

Double

Which of the following is the ideal gas equation.

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PV -n RT

P/V = n RT

V/P = nR/T

PV = T/nR

Polarization is characteristic of.

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Light wave

sound waves

Waver waves

x-rays

Which liquid can flow easily.

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Traacle

Pitch

Ether

All flow with same rate

What is the represented by the area inside the Carnot cycle.

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Heat taken to increase the body temperature.

Energy loss due to leakage

Useful work done

Heat rejected by the system

Which scientist announced for the first time that the universe is expanding.

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Einstein

Newton

Edward Hubble

Karl Marx

Inserting a di electric between the plates of a charged parallel plate capacitor.

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Decrease the capacitance

Leaves teh capacitance the same

Encourages breakdown between the plates

Reduces the electric intensity between the plates

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