Question # 1

Why hydrogen atom does not emit x-rays.

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its size is very small

It contains only single electron

In it energy levels are for apart

In it energy levels are close to each other

The scalar product of two vectors in negative when

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Vectors are parallel

Vectors are antiparallel

Vectors and perpendicular

Vectors are parallel with same magnitude

Who wrote books on sound and music.

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Galileo

Alkundi

Alberuni

Ibn al Haithem

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 index of refraction depends on

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the focal length

The speed of light

The image distance

The object distance

When light enters glass from air it suffers a change in.

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Wavelength

Wave front

Velocity

All of these

The specific heat of a substance is a function of its

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mass

Weight

Volume

Molecular structure

Which of the following is a thermodynamic potential

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Internal energy

Enthalpy

Gibb's free energy

All of these

A water wave is an example of.

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Transverse wave

Longitudinal wave

Hair wave

Shock wave

Magnetic fields do not interact with

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Stationary electric charges

Stationary permanent magnets

Moving electric charges

Moving permanent magnets

The speed of a sound wave is independent of

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Nature of medium

Pressure

Temperature

Mass and energy

A stretched wire with clamped ends has a fundamental frequency of 1,000 Hz. What will be the new fundamental frequency if tension in the wire is increased by 2%

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980 Hz

1,000 Hz

1,010 Hz

1,020 Hz

Who was awarded Nobel Prize for predicting meson.

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Yukawa

Pauli

Schrodinger

Fermi

When Electric current flows through the wire it increases.

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P.E of the atoms

K.E. of the atomss

Atomic size

Number of protons

Why does a transformer have a core made of iron.

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Iron has a high melting point

Iron is a magnetic material

Iron potential and high current

Iron is a conductor of electricity

The hydrogen filled balloon possesses

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P.E

K.E

Heat energy

Elastic energy

Lenz's presented his law is

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1826

1829

1834

1839

Which of the following is the science of measuring the heat of chemical reactions or physical changes.

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Thermometry

Calorimetry

Telemetry

Photometry

The phenomenon of natural radioactivity was discovered by

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Lord Rutherford

James Chadwick

Herie Becquerel

Maria curie

Emitter follower amplifier is an example of.

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Current series feedback

Voltage series feedback

Current shunt feed back

Voltage shunt feedback

The phenomenon of Compton's effect process that right has

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Wave nature

Particle nature

Dual nature

Corpuscular nature

The phenomenon of interference comes about because waves obey

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the impulse momentum theorem

An inverse square law of intensity

The principle of reciprocity

The principle of super position

_{When a charged particle moves through a magnetic field it suffers a change in its}

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Charge

Mass

Energy

Direction of motion

Triple point of water in Kelvin scale is

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0 K

100 K

273 .15 K

373.15 K

A perfect gas is one whose

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Molecules are masless

Molecules are energetic

Molecules are perfectly elastic

Molecules are at rest

When impurities are added to metals they

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Will decrease the elasticity

Will increases the elasticity

Will not change the elasticity

Will or will not change the elasticity

How does viscosity affect relative motion between the liquid layers.

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Does not affect

Accelerates

May accelerate of retard

Retards

In the concept of magnetic circuit, the quantity analogous to resistance in Ohm's law is.

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Reactance

Dipole

Impedence

Reluctance

Two wires P and Q each of same length and the same material are connected in parallel to a battery The diameter of P is half that of Q What fraction of the total current passes through P.

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0.02

0.25

0.33

0.50

If the source of emf is traversed from negative to positive terminal the potential charge.

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Is negative

Is positive

Is zero

Remain the same

Which one of the following does not have the same dimenstions.

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Energy ,work, heat

Pressure, stress, Young's modulus

Voltage, electromotive force, potential difference

Electric flux, electric field, electric dipole moment

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