ppsc past papers of lecturer Physics

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

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

energy

velocity

forces

position

2 / 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

3 / 25

What is the absorption power of perfect black body?

−1

infinity

4 / 25

Which force pushes up a body in a fluid?

lift

pressure

buoyant

thrust

5 / 25

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

turbulence

thrust

drag

lift

6 / 25

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

the lasing material is a gas

the lower level is the ground state

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

the lower level is metastable

the upper level is metastable

7 / 25

The spectrum of a black body is:

line

band

none of the above

continuous

8 / 25

Any substance that can flow is a:

liquid

fluid

gas

solid

9 / 25

A gas behaves as an ideal gas at:

low pressure and low temperature

high pressure and low temperature

high pressure and high temperature

low pressure and high temperature

10 / 25

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

Burnoulli’s

Ohm’s

Pascal’s

Archimedes

11 / 25

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

photons do not split too rapidly

photons do not make upward transitions

more photons are emitted than are absorbed

spontaneous emission does not occur more often than stimulated emission

photons do not collide with each other

12 / 25

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

Kirchoff’s law

Wien’s law

Stefan’s law

Planck’s law

13 / 25

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

10,000

2300

1500

4000

14 / 25

Photons in a laser beam are produced by:

pumping

transitions to a metastable state

splitting of other photons

transitions from a metastable state

transitions from a state that decays rapidly

15 / 25

Birds, planes and boats are streamlined to reduce:

drag

lift

turbulence

thrust

16 / 25

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

to increase the number of stimulated emissions

to assure that no laser light leaks out

to double the effective length of the laser

to keep the light used for pumping inside the laser

to absorb some of the photons

17 / 25

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

increases

decreases

first increases then decreases

becomes zero

18 / 25

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

N, He

He, Ne

He, He

Ne, He

Ne, Ne

19 / 25

The design of an airfoil uses:

none of the above

Archimedes’ principle

Bernoulli’s principle

both of the above

20 / 25

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

photons do not make upward transitions

spontaneous emission does not occur more often than stimulated emission

photons do not collide with each other

more photons are emitted than are absorbed

photons do not split too rapidly

21 / 25

The colour of a star is an indication of its:

weight

distance from the earth

temperature

size

22 / 25

What is measured by a Bolometer?

thermal conductivity

heat radiation

e.m.f.

specific heat

23 / 25

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

turbulence

drag

thrust

lift

24 / 25

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

Physiology

Geology

Rheology

Cosmology

25 / 25

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

static head

velocity head

pressure drop

total head

Your score is

The average score is 56%

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