FPSC Lecturer Physics past papers

PPSC Lecturer of Physics Online Test 35 Past Papers

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Test Instructions:-
Test Name	Lecturer Physics
Subject	Physics Test 35
Test Type	MCQs
Total Questions	25
Total Time	20 Minutes
Total Marks	100

You have 20 minutes to pass to the quiz.

PPSC Lecturer of Physics Test 35

1 / 25

Which principle is in effect when a ship displaces ocean water?

Burnoulli’s

Pascal’s

Archimedes

Ohm’s

2 / 25

The study of the deformation and flow of matter, primary in the liquid state is called:

Physiology

Geology

Cosmology

Rheology

3 / 25

Any substance that can flow is a:

gas

fluid

solid

liquid

4 / 25

The spectrum of a black body is:

none of the above

line

continuous

band

5 / 25

When air moves an airfoil, ................ is generated:

turbulence

drag

lift

thrust

6 / 25

With increase in temperature, the angle of contact of liquid:

becomes zero

decreases

increases

first increases then decreases

7 / 25

Newton’s law of cooling is a special case of:

Stefan’s law

Kirchoff’s law

Planck’s law

Wien’s law

8 / 25

The purpose of the mirrors at the ends of a helium-neon laser is:

to assure that no laser light leaks out

to keep the light used for pumping inside the laser

to increase the number of stimulated emissions

to absorb some of the photons

to double the effective length of the laser

9 / 25

Which force pushes up a body in a fluid?

thrust

buoyant

lift

pressure

10 / 25

A metastable state is important for the generation of a laser beam because it assures that:

spontaneous emission does not occur more often than stimulated emission

more photons are emitted than are absorbed

photons do not collide with each other

photons do not split too rapidly

photons do not make upward transitions

11 / 25

Fluid mechanics is the study of how fluids move and the..............on them:

forces

position

energy

velocity

12 / 25

In flow through a straight, smooth, pipe, the critical Reynolds number for transition to turbulence is generally taken to be:

2300

10,000

1500

4000

13 / 25

Minor losses through valves, fittings, bends, etc., are modelled as proportional to:

velocity head

static head

pressure drop

total head

14 / 25

A gas behaves as an ideal gas at:

high pressure and high temperature

low pressure and low temperature

high pressure and low temperature

low pressure and high temperature

15 / 25

Which of the following is essential for laser action to occur between two energy levels of an atom?

the lower level is the ground state

the lower level is metastable

there are more atoms in the lower level than in the upper level

the lasing material is a gas

there are more atoms the upper level than in the lower level

16 / 25

The colour of a star is an indication of its:

size

distance from the earth

weight

temperature

17 / 25

What is the absorption power of perfect black body?

−1

infinity

18 / 25

Photons in a laser beam are produced by:

transitions to a metastable state

transitions from a metastable state

splitting of other photons

transitions from a state that decays rapidly

pumping

19 / 25

Which of the following is essential for laser action to occur between two energy levels of an atom?

the lower level is metastable

the lasing material is a gas

the lower level is the ground state

the upper level is metastable

there are more atoms in the lower level than in the upper level

20 / 25

The force that moves a rocket or a plane forward is called:

turbulence

drag

thrust

lift

21 / 25

The design of an airfoil uses:

Archimedes’ principle

both of the above

Bernoulli’s principle

none of the above

22 / 25

Population inversion is important for the generation of a laser beam because it assures that:

spontaneous emission does not occur more often than stimulated emission

photons do not collide with each other

photons do not make upward transitions

photons do not split too rapidly

more photons are emitted than are absorbed

23 / 25

In a helium-neon laser, the laser light arises from a transition from a state to a state:

He, Ne

He, He

Ne, Ne

Ne, He

N, He

24 / 25

What is measured by a Bolometer?

e.m.f.

thermal conductivity

heat radiation

specific heat

25 / 25

Birds, planes and boats are streamlined to reduce:

thrust

drag

turbulence

lift

Your score is

The average score is 56%

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