Question # 1

If the flow is incompressible and the flow is steady then the mass of the fluid through the pipe

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increases

decreases

becomes zero

is conserved

A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is

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1.66 m

1.66 x 10^-10m

1.66 x 10^-29cm

1.66 x 10^-29m

The half life of uranium-238 is

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6.2 x 10⁹years

4.5 x 10⁹days

4.5 x 10⁹years

1.3 x 10⁶years

When the surfaces are coated with a lubricant, then they

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Stick to each other

Slide upon each other

Roll upon each other

None of these

The force experienced by charged particle is maximum, if it moves

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parallel to magnetic field

perpendicular to magnetic field

opposite to the magnetic field

none of these

The most common source of alternating voltage is:

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Motor

Transformer

AC genrator

Both (A) and (C)

Both (A) and (B)

Radioactivity

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is exhibited more by semiconductors in general

in exhibited more by the element when they are coupled

with other radioactive elements by a covalent bond

is an atomic property of radioactive elements

The domains are of macroscopic size of the order of

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centimeters

meters

millimeters

nanomneters

In Pakistan electricity is supplied for domestic use at 220 V, it is supplied at 110 V in USA. If the resistance of a 60 W bulb for use in Pakistan is R, the resistance of a 60 W bulb for use in USA will be

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2 R

R/4

R/2

R

A typical rocket consists of fuel

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more than 60% of launch mass

less than 60% of launch mass

less than 80% of launch mass

more than 80% of launch mass

When a position comes close to an electron they annihilate into

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one photon

two photons which travel in the same direction

two photons which travels in the opposite direction

two photons which travel in any direction

If a train traveling at 72 kmph is to be brought to rest in a distance of 200 meters,then its retardation should be

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20 ms^-2

10 ms^-2

2 ms^-2

1 ms^-2

The relative permitivity ∈_r for teflon is

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2.1

2.4

2.9

3.0

The rain drop falling from the sky reach the ground with

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Constant terminal velocity

Constant gravitational acceleration

Variable acceleration

Acceleration greater than g

An are equal to half of the radius subtend angle of ________ at the center of circle.

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.π rad

2π rad

1/2π rad

1/2 rad

The optical resolution of microscope or a telescope tells us how close together, the two point sources of light can be so that they are still seen as two separate sources

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Angular magnification

Resolution

Magnification

None of these

X-rays is a type of electron magnetic radiations of much shorter wavelengths of the order of

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10^-8 m

10^-9 m

10^-10 m

10^-12 m

The frame of reference in which Newton's first law of motion holds is known as

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non-inertial frame is known as

inertial frame of reference

both of them

neither of them

A 10 kg car is turning around a corner at 10 ms^-1. The radius of the circular arc is 10 m. Find the force between the types and pavement which is

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1.0 × 10⁶ N

1.0 × 10⁴ N

1.0 × 10² N

None of these

Tick which of the following is not state variable:

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Heat energy

Pressure

Entropy

Volume

A point charge Q is placed at the mid-point of a line joining two charges,4q and q. if the net force on charge q is zero,then Q must be equal to

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-q

+q

-2q

+4q

Inverse square law for luminance is valid for

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Search light

Isotropic point source

Cylindrical source

All types of sources

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