Question # 1

A ball of mass 1 kg moving wih velocity 2 ms^-1 its momentum will be;

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1 Ns

2 Ns

0.5 Ns

4 Ns

At sea level, the atmospheric pressure is about.

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101320 Pa

101300 Pa

10110 Pa

10112 Pa

In Which of the following state molecules do not leave their position?

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Solid

Liquid

Gas

Plasma

The unit of acceleration is.

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ms-1

ms

ms^-2

ms²

The unit of velocity and speed is.

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ms

ms^-2

ms^-1

ms-3

The acceleration of a body moving the uniform velocity is.

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Uniform

Zero

Negative

Variable

The speed of satellites in GPS is:

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8.73 kms^-1

3.87 ms^-1

32 ms^-1

3.87 kms^-1

A string is stretched by two equal and opposite force 10 N each. The tension in the string is:

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Zero

5 N

10 N

20 N

GPS consists of __________ earth satellites.

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30

2

7

24

Centripetal force always acts _________ to the motion:

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Opposite

Parallel

Perpendicular

Upward

The orbital speed of a low orbit satellite is:

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Zero

8 ms^-1

800 ms^-1

8000 ms^-1

Short form of information Technology is:

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IT

ITS

CBIS

IS

If a neutral body is brought near to the electroscope its leaves:

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Diverge

Contract

Shut

Remain in normal position

The S.I unit of electric potential is:

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Watt

Joule

Coulomb

Volt

In CD presence of pits is indicated by:

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0

2

3

1

Each volt of lightening contains energy:

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4x10⁶ joules

1000 joules

1000 million joules

10 joules

The shape of magnetic lines of force in case of a straight current carrying conductor is:

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Eliptical

Trangular

Rectangular

Circular

To hear echoes, the minimum distance of the obstacle from source of sound should be:

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10 m

15 m

17 m

20 m

In 1950, physicists observed that in cathode ray tube a special type of rays produced from cathode, these rays were called:

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Cathode rays

X-rays

Alpha rays

Gamma rays

The half life of radium 226 is

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1600 year

1610 years

1620 years

1630 years

First voice signal was transmitted in the form of electrical signal in:

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1870

1875

1876

1880

The example of magnetic disk is:

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Compact disk

Floppy disk

Audio cassette

Video cassette

When body acquires terminal velocity them its acceleration 'a' becomes.

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a = 0

a = g

a > 0

a < 0

The property of bending of light around obstacles is

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Interference

Diffraction

Polarization

Superposition

When a body is whirled in a horizontal circle by means of string, the centripetal force is supplied by

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Mass of body

Velocity of a body

Tension in the string

Centripetal acceleration

The regular or steady flow of fluid is called

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Stream line

Turbulent flow

Average flow

None of these

the acceleration along x -axis direction in case of projectile is.

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Zero

Equal to gravity

Maximum

Constant

The number of spark plug needed in diesel engine is

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0

2

3

4

How many orbiting satellites from the Global positing system.

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3

12

24

22

The distinguish between transverse and longitudinal wave_______ is used.

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Refraction

Interference

Diffraction

polarization

In the absence of air resistance the acceleration of a body will be

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Uniform

Variable

Instantaneous

None of these

Unite of thermodynamics scale of temperature is.

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Centigrade

Fahrenheit

Kelvin

Celsius

A bullet shot straight up, return to its starting point in 10 sec. Its initial speed was

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9.8 ms-1

24.5 ms-1

49 ms-1

98 ms-1

The binding energy per nucleon is maximum for

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Helium

Iron

Potassium

Radium

Wave nature of particle was given by:

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Clemensen

Louis de Broglie

Laster H. Germer

Clinton S. Davisson

The Lenz's law fulfils.

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Law of conservation of energy

Law of conservation of charge

Law of conservation of momentum

Kirchhoff's law

Pair production occurs only when energy of photon is at least equal in:

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1.02keV

1.02 eV

1.02 MeV

1.02 GeV

The quantity time constant RC has units of.

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Charge

Time

Capacitance

Resistance

In Pakistan the frequency of A.C. supply is.

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50 Hz

60 Hz

45 Hz

70 Hz

Light of 4.5 eV is incident on a Cesium surface and stopping potential is 0.25 eV, maximum K.E. of emitted electron is.

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4.5 eV

4.25 eV

4.75 eV

0.25 eV

1 amu is equal to

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1.0606 x 10^-27 kg

1.66 x 10^-31 kg

1.66 x 10^-34 kg

1.66 x 10^-19 kg

Closeness of the electric field lines is the measure of.

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Direction of field

Strength of field

Potential difference

Uniformity of field

The wave form of alternating voltage is a

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Cotangent curve

Cosine curve

Sine curve

Tangent curve

A solid in which there is not regular arrangement of molecules is called.

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Glassy solid

Amorphous solid

Crystalline solid

Both a and b