Question # 1

The tidal energy is due to gravitational pull of :

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sun

moon

Mars

None of these

The total energy of spring mass system is

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zero

changing with time

constant

none of them

Earth is considered to be

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a non-inertial frame

an inertial frame

an accelerated frame

none of the above

Swimming becomes possible because of______law of motion:

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First

Second

Third

None of these

Example of vibratory motion is

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mass suspended from a spring

a bob of simple pendulum

mass attached to a spring placed

all of them

In Bernoulli's theorem the relation between velocity and pressure is

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Inverse

Direct

None of the above

Both a and b

The rate at which the free electrons pass through any section of a metallic wire from right to left is:

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Greater than the speed at which they pass from left to right

Less than the speed at which they pass from left to right

The same speed at which they pass from left to right

Any of above

None of them

An inertial frame of reference is that frame of reference in which

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a = 0

a > 0

a < 0

all of them

The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is

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100 ev

10⁶e v

10³e v

1.0 e v

Diameter of the nucleus s of the order of

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10^-10m

10^-12m

10^-15m

10^-18m

The work done by the system on its environment is considered as

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positive

negative

zero

any one of them

Physics details with the study of:

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Matter

Energy

Both of them

Human body

Referring to above figure, due to change in current in the coil P, the change in magnetic flux:

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Is associated with coil P

Is associated with coil S

Causes an induced current is coil S

All of these

None of these

In case of point, source of light shape of wavefront is:

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Spherical

Cylindrical

Plane

None of these

When a silicon crystal is doped with a pentavalent element, such an extrinsic semi-conductor is called

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p-type semi-conductor

n-type semi-conductor

either of them

none of them

The force exerted on a conductor of length L, carrying current I when placed in a magnetic field B is given by

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F=IB/L

F= L x B/I

F = IL x B

F = IL . B

The equation of continuity is

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A₁A_{2 = V}₁V₂

A_1/_V_{1 =}A_2/V₂

_V_1/A₁₌V_2/A₂

A₁_V_{1 =}A₂V₂

The holes created in the L and M shells are occupied by transitions of:

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Electrons from lower states

Electrons from higher state

Positrons from higher states

Electrons from K shell

Both (A) and (B)

A motorist travels A to B at a speed at 40 km/h and returns at speed of 60km/h. His average speed will be

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40 km/h

48 km/h

50 km/h

60 km/h

The electric field due to an infinite long thin wire at a distance R varies as

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1/R

1/R²

R

R²

The terminal velocity of a small size spherical body of radius R moving in a fluid varies as

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R

R²

1/R

(1/R)²

Significant figures in 0.0010 are

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Four

Three

Two

One

Electron gun consist of

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three anodes

heating cathode

three anodes

three anodes , heating cathode, grid

The unit of thermodynamical scale is

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centigrade

fahrenheit

kelvin

none of them

A high temperature, the proportion of shorter wavelengths radiation, emitted by the body

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decreases

first increases then decreases

increases

any one of them

The doped semi-conductor materials are known as

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intrinsic semi-conductor

extrinsic semi-conductor

either of them

none of them

The materials in which there are plenty of free electrons for electrical conduction are known as

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conductors

insulators

semi-conductors

all of them

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

In an A.C. circuit, a resistance of R ohm is connected in series with an inductance L. If phase angle between voltage and current be 45°. the value of inductive reactance will be

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R/4

R/2

R

Cannot be found with the given data

An electric charge at rest is

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Only an electric field

Only a magnetic field

Both electric and magnetic fields

None of the above

A dirty carpet is to be cleaned by heating. This is in according with______law of motion.

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First

Second

Third

None of these

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