Question # 1

The unit of intensity level is.

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Watt

Joule

Bel

Sabin

A wave source of frequency 1000 Hz emits waves of wavelength 0.1 m How long does is take for the waves to travel 2500 m.

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20 s

25 s

40 s

100 s

When a balloon sticks to the whiteboard It is an example of.

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Conoduction

Induction

Polarization

Conservation of charge

The resultant of two force 3 N and 4 N making an angle 90 ^o with each other is.

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1 N

3 N

5 N

10 N

Two unchanged objects A and B are rubbed against each other, when object B is placed near a negatively charged object C the two objects repel each other Which of these statements is true abut object A.

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It remains uncharged

It becomes positively charged

It becomes negatively charged

It is unpredictable

Which thermometer is called sprint thermometer

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Alcohol thermometer

Mercury in glass thermometer

Gas thermometer

Radiation thermometer

Planets move around the sun due to.

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Centrifugal force

Centripetal force

Gravitational pull between them

Frictional force between them

Which given material is the best for making connecting wires

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Nichrome

Iron

Gold

Copper

From which radiation it is most difficult to protect oneslelf.

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Alpha radiation

Beta radiation

Gama radiation

Heat radiation

Which Muslim Scientist is regarded as father of optics.

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Ibn al Haithem

Al khawarizmi

Nasir al Din Al tusi

Ibn Musa al khawarzmi

Direct current generators use.

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Coiled rings

Split rings

slip rings

solenoid rings

The charge per unit volt which is a constant property of the system is known as the

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Dielectric constant

Permitivity

Capactance

Inductance

The value of critical angle of glass is

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45^o

42^o

48^o

52^o

When a following field is governed by Maxwell's equations.

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Electrodynamics

Optics

electric circuits

All of these

The total energy of the hydrogen atom is

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zero

Infinite

positive

Negative

The phase velocity is the velocity of a point that moves with a wave at constant phase it is also called.

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Phase speed

Wave speed

Wave velocity

All of these

At series resonance in L-C-R circuit the impedance is equal to.

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Ohmic resistance

Inductive reactance

Capacitive reactance

Inductive reactance minus capacitive reactance

In which temperature range water decreases in volume with increasing temperature.

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From 0 ^oC to 4 ^oC

from 0 ^oC to 10 ^oC

from 50 ^oC to 100 ^oC

from 75 ^oC to 100 ^oC

In the equation P = IV cos Theta Cos theta is known as

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Phase angle

Liming angle

Phase

Power factor

Simple harmonic motion is a type of

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rectilinear motion

Circular motion

Rotational motion

Zig Zag motion

In a Nuclear reactor which material is often used as modeerator.

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Water

Graphite

Uranium

Water and graphite

The ratio of the velocity of sound in hydrogen to the velocity of sound in oxygen is

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4:1

16:1

2:1

8:1

A darling ion amplifier is characterized by

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High voltage and current gain

High input resistance and current gain

High output resistant and current gain

Low input resistance and current gain

Current in an electrolyte is carried by.

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Electron only

Anions only

Citations only

Mesons only

When a body acceleatres.

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Its direction always chances

It mass always changes

It velocity always changes

It falls towards the earth

Which part of D.C motor reverses the direction of current through the coil every half cycle.

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The armature

The commutator

the brushes

The slips rings

Which one of the following is not true.

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velocity can be negative

velocity is a vector

Speed is a sccalar

Speed can be negative

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

Density of blood a

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Equal to water

Greater than water

Less than water

zero

Emitter follower amplifier is an example of.

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Current series feedback

Voltage series feedback

Current shunt feed back

Voltage shunt feedback

In order to har an echo what is the minimum distance between the sound and reflecting surface.

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0.65 m

16.5 m

1.65 m

165 m

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