Question # 1

Deep water almost runs still when surface water flow in rivers. What does it explains

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Magnus effect

Equation of continuity

Surface energy

Bernoulli's equation

A mass spectrograph sort out

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molecules

atoms

elements

isotopes

Which one of the following is correct?

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V_o= 1.414 V_rms

I_ams= 1.414 I_o

VO = 10.70 Vrms

Both a and b

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

Whenever a covalent bond is broken in an intrinsic semi-conductor

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hole is created

an electron is created

an electron-hole pair is generated

all of them

In case of metallic conductors, the change carries are:

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Protons

Electrons

Antiprotons

Positrons

Both (A) and (B)

When angular acceleration is positive, the body rotates:

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Slower

Slowest

Faster

None of these

The path (or trajectory) described by a projectile is

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a parabola

a hyperbola

a circle

a straight line

Self inducede e.m.f. is also called

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Motional e.m.f.

Thermistor

Electrostatic induction

Back e.m.f

The principle of superposition states that

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The total displacement due to several waves is the sum of the displacement due to those waves acting individually

Two stationary waves superimpose to give two progressive waves

A diffraction pattern consists of many interference patterns superimposed on one another

Two progressive waves superimpose to give a stationary wave

For production of beats the two sources must have

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Different frequencies and same amplitude

Different frequencies

Different frequencies, same amplitude and same phase

Different frequencies and same phase

Viscosity is the property by virtue of which a liquid

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Becomes spherical in shape

Occupies minimum surface area

Oppose relative motion between layers

Tends to regain its deformed position

Shear modulus for lead is

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1.7

4.9

5.6

6.2

The relation d sinθ = nλ, where 'n' is the

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Number of bright fringes

Number of dark fringes

Order of the spectrum

None of these

Torque will be zero if

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body is at rest

rotating with uniform angular velocity

zero angular acceleration

all of them

The direction of the acceleration is the same as that of

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Displacement

Velocity

Both

None of these

If a body, under the action of a number of forces, is in equilibrium, then it is

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at rest

in uniform motion

either at rest or in uniform motion

none of them

Graphs which are used to illustrate the variation of velocity of an object with time are called

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distance-time graphs

speed-time graphs

velocity-time graphs

acceleration-time graphs

If we keep the moment arm, fixed while change the force, then, the torque is

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Changed

Does not change

Some what change

None of these

Three coplanar forces acting on a body keep it in equilibrium. They should, therefore be

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Parallel

Non-parallel

Concurrent

Non concurrent

For incident angles equal or greater than the critical angle the glass air boundary will act as a

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Convex mirror

Concave mirror

Mirror

None if them

Human body pressure measure in

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torr

pascal

mmH_g

Nm^-2

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