Question # 1

Frequency less than 120 Hz are known as

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Infrasonic

Ultra sonics

Super sonics

Infrared

The mains frequency in Pakistan is

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20 Hz

50 Hz

40 Hz

60 Hz

An instrument used to find the direction of the earths magnetic field is known as.

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Magnetometer

Electroscope

Cyclotron

Particle accelerator

The coulomb's law is valid for the charges which are.

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Moving and point charges

Moving and non point charges

Stationary and point charges

Stationary and large size charges

Which of the following quantities is discrete according to Bohr's hypothesis.

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Momentum

Potential energy

Angular velocity

Angular momentum

The value of open loop gain for the amplifier is

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zero

very low

very high

of an intermediate vaue

Which of the following phenomenon is observed in obtaining an X ray photograph of our hand.

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Photoelectric effect

Zeeman effect

Shadow photography

Ionization

The particles equal in mass or greater than protons are called.

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Mesons

Bosons

Baryons

Nucleons

The tunnel effect makes possible

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Alpha decay

Gama rays

Positive Beta decay

negative Beta dacay

Which kind of motion is exhibited by molecules of monoatomic gas.

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Rotatory

Vibratory

Translatory

Random

Marie Curie and Pierre Curie discovered two new radioactive elements which are.

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Uranium and radkum

Platinum and radium

Polonium and radium

Crypton and radon

Which of the following solids exhibits only short range order.

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Amorphous solids

Polymeric solids

Crystalline solids

All of the above

Which vector can be used to locate the centre of mass of a collection of particles.

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Null vector

Unit vector

Position vector

Distance vector

The permeability of a diamagnetic material is

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Greater than unity

Less than unity

Equal to unity

Zero

Reciprocal of the focal length is called.

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Radios of curvature of the lens

Power of the lens

Aperture of the lens

Resolving power

In an isobaric process there is no.

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Pressure change

Internal energy change

Heat exchanged

volume change or work done

If a wave vibrate 10 times in 1 s with a speed of 10 m s-1 the correct wavelength of the wave is.

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1 m

10 m

20 m

100 m

How the fuse wire in electric supply line is connected to protect the electrical appliances.

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In parallel

In sereis

In mixed order

In vertical position

Which scientist coined the term quantum mechanics.

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Kari mark

Max Born

Erwin schrodinger

Issac Newton

X -rays are similar in nature to.

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Alpha particles

Beta particles

Gama rays

Photons

Which one of the following scientists got Noble prize due to his work of combining two basic forces of nature.

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Dr. Abdul Qadeer khan

Dr. Abdul Salam

Dr. Muhammad ishfaq

Dr. Mubarak mund

Electricity is transmitted at high voltage rather than at low voltage because.

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It is generated at high voltage

It is safer

It requires less insulation

It wastes less energy

A preset or trimmer can be a.

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Variable resistor

Variable capacitor

Variable inductor

All of these

A body of mass 1 kg hanging with a spring of spring constant 60 N m-1 is rotation in a horizontal circle The values of angular frequency will be.

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80 .94 Hz

89. 4 Hz

98. 4 Hz

108 . 6 Hz

The rms value of emf in a circuit is given by a factor of.

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0.637

0.7

0.707

1.11

Sounds of frequencies higher than 20,000 Hz are called.

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Super sonics

Infrasonic

Ultrasounds

Audible sound waves

A body attached to a spring is pulled to a distance of 20 cm If the value of spring constant is 48 N m-1, the amount of force applied will be.

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4.8 N

9.6 N

96 N

192 N

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

Choose the one which acts as single inverter.

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Common emitter

common collector

Common base

Diode

Highly conducting state of matter is

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Conductors

Plasma

Semiconductors

Insulators

The concept of entropy was introduced by

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Saadi Carnot

Boyle

Charles

Rudolph Celsius

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