Question # 1

The missing mass which is converted to energy in the formation of nucleus, is called

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packing fraction

mass defect

binding energy

none of these

The energy acquired by a mass of 1g moving with the speed of light is

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3 x 10⁸J

9 x 10¹³J

3 x 10¹³J

9 x 10¹⁶J

When certain area A is held parallel to the field lines, then:

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No lines cross this area

Maximum lines pass through this area

The number of lines are between zero and maximum

Both (A) and (B) correct

None of these

Two bullets are fired simultaneously, horizontally and with different speeds from the same place. Which bullet will hit the ground first?

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The faster one

Depends on their mass

The slower one

Both will reach simultaneously

Above a certain velocity of a fluid is called

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turbulent flow

steady flow

either of them

both of them

Which of the following material has longer half life

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radium

polonium

radium

uranium

In crystalline solids, atoms are held about their equilibrium positions depending upon the strength of:

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Adhesive force

Nuclear forces

Inter atomic cohesive force

Electromagnetic force

None of these

The rate of decay of a radioactive substance

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decrease exponentially with time

decreases linearly with time

increases linearly with time

increases exponentially with time

Laws of motion are not valid in a system which is

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inertial

non-interial

at rest

moving with uniform velocity

If speed of electron is 5 x 10⁵m/s. How long does it take one electron to transverse 1 m?

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1 x 10⁶

2 x 10⁶

2 x 10⁵

1 x 10⁵

Neutrons are

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positive charge

negatively charged

massless

neutral

A current carrying conductor is placed at right angle to the magnetic field. The magnetic force experienced by the conductor is

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minimum

maximum

zero

none of these

The density of blood is nearly equal to that of

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mercury

sodium

water

honey

If the value of C in a series RLC circuit is increased, the resonant frequency

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Is not affected

Increase

Remains the same

Decreases

A.C. can be measure with the help of

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Nuclear effect

Magnetic effect

Chemical effect

Heating effect

Strictly speaking, the earth is:

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An accelerated frame of reference

A non-inertial frame of reference

An inertial frame of reference

^{A non-accelerated frame of reference}

Both (A) and (B)

The isotope/s of hydrogen is /are:

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Protium

Deuterium

Tritium

Both (A) and (B)

All of these

The torque per unit twist of coil is called

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proportionality constant

gravitational constant

boltzman constant

coupling constant

A body is dropped from a tower with zero velocity, reaches ground in 4s. The height of the tower is about

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80 m

20 m

160 m

40 m

For a fixed force, larger is the mass of a body the

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greater is its acceleration

smaller is its acceleration

smaller is its weight

zero is its acceleration

Rocket engines lift a rocket from the earth surface, because hot gas with high velocity

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Push against the air

React against the rocket and push it up

Heat up the air which lifts the rocket

Push against the earth

If a simple pendulum is shifted from karachi to K-2 cliff, its time period

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remains the same

decreases

increases

none of them

A container has a small hole in the bottom. Air can go through this hole,but water cannot. This can be best explained by the statement that

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water contains hydrogen atoms, air does not

water molecules are smaller than molecules in the air

surface tension of the water prevents it from

The waves in which the particles of the medium have displacement along the direction of propagation of waves are called

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longitudinal waves

transverse waves

non-mechanical waves

none of them

The emission of electrons from a metal surface when exposed to light of suitable frequency is called the

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pair production

Compton effect

photoelectric effect

relativity

For measuring large currents, an ordinary galvanometer cannot be used without proper, then both relates with each other as

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modification

voltage

current

resistance

The colour sequence in a carbon resistor in red, brown, orange and silver. The resistance of the resistor is

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21 x 10³+ 10%

23 x 10¹+ 10%

21 x 10³+ 5%

12 x 10³+ 5%

A ball falls on the surface from 10 m height and rebounds to 2.5 m. if the duration of contact with the floor is 0.01 seconds then the average acceleration during contact is

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2100 m/s²

1400 m/s²

700 m/s²

400 m/s²

If two bulbs one of 60 W and other of 100 W are connected in parallel, then which one of the following will flow more?

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60 W bulb

100 W bulb

Both equally

None of these

The amount of energy equivalent to 1 a.m.u is

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9.315 Mev

93.15 Mev

931.5 Mev

2.22 Mev

The state in which ice, water and vapour coexists in equilibrium is called

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zero degree celsius

zero degree fahrenheit

absolute zero

373 K

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