PPSC PHYSICS-Mock Test-02

02- Which of the following is used for the failure of a lens to form a sharp and distinct image?

Chromatic aberration

Distortion

Astigmation

Spherical aberration

03- At the resonance the value of power factor in an L.C.R series circuit is:

1/2

One

Zero

Infinite

05- Two parallel wires carrying current in the opposite direction:

Do not attract

Get rotated perpendicular to each other

Repel each

Attract

07- Which of the following is used for reducing spherical aberrations in optical instruments?

Spherical mirrors

Plane mirrors

Plano-convex lens

Concave lens

08- The penetrating power of x-rays increase with:

Decrease in intensity

Decrease in its velocity

Increase in its velocity

Increase in its intensity

09- It is possible to distinguish between transverse & longitudinal waves by studying the property of:

Diffraction

Interface

Any of them

Polarization

11- Which Muslim scientist is regarded as "father of optics"?

Al-Khawarizmi

Ibn Ishaq al-Kindi

Nasir al-Din al-Tusi

Ibn al-Haytham

13- Which one of the following waves cannot be polarized:

X-rays

Sound waves

Radio waves

Ultraviolet waves

14- A dimensionless quantity is a quantity without an associated physical dimension. Which of the following is not a dimensionless quantity?

Radian

Force

Decibel

20- Which Muslim scientist gave the first clear description and correct analysis of pinhole camera in the Book of Optics (Kitab al-Manazir) in 1021 AD?

Ibn al-Haytham (Alhazen)

Nasir al-Din al-Tusi

Ibn Ishaq al-Kindi (Alkindus)

Ibn Musa al-Khawarizmi

24- If the distance between two charges is doubled the coulomb force will become:

Electron

Same

Double

Half

25- Which one of the following represents a travelling wave:

A Sin (wt+ Ø)

A Cos (wt + Ø)

A Sin (wt + kx)

A Cos (wt-kx)

28- Air bubble in water shines because of the phenomenon of:

Diffraction

Refraction

Dispersion

Total internal reflection

31- Siphon will fail to work if:

Both its limbs are of unequal length

The level of the liquid in the two vessels are at the same height

The densities of the liquid in the two vessels are equal

32- Large transformers, when used for some time, become very hot and are cooled by circulating oil. The heating of the transformer is due to:

Hysteresis loss alone

Both the heating effect of current and hysteresis loss

Intense sunlight at noon

The heating effect of current alone

33- If we add all the 7 colours of rainbow (red, yellow, blue, green, violet and indigo), the resultant colour would be?

Black

Dark Blue

White

Red

34- Ozone layer protects the Earth from____ radiations from the Sun:

Microwaves

Infrared

Ultraviolet

X-rays

35-Radiocarbon is produced in the atmosphere as a result of:

Action of solar radiations particularly cosmic rays on carbon dioxide present in the atmosphere

Collision between fast neutrons and nitrogen nuclei present in the atmosphere

Lightning discharge in atmosphere

Action of ultraviolet light from the sun on atmospheric oxygen

36- Short-sight defect could be corrected by a:

Convex lens

Concave lens

Converging lens

None of these

38- Planets are kept in orbit by the?

Gravitational pull of the sun

Radiations from the sun

Attraction among the Planets and the sun

Attraction among the Planets

39- What are primary colors?

Color in the spectrum of the white light

Color of the rainbow

Colors which cannot be produced

Color found in nature

40- Planets do not twinkle because:

They emit light of a constant intensity

They are very far away from the earth resulting in decrease in intensity of light

Their distance from the earth does not change with time

They are nearer to earth and hence we receive a greater amount of light and, therefore minor variations in the intensity are not noticeable

42- Stars appears to move from east to west because:

The background of the stars moves from west to east

All stars move from east to west

The earth rotates from west to east

The earth rotates from east to west

44- A camera uses a _______ to form an image on a piece of film at the back:

Convex lens

Concave lens

Diverging lens

None of these

45- Mirage is due to:

Depletion of ozone layer in the atmosphere

Magnetic disturbances in the atmosphere

Unequal heating of different parts of the atmosphere

Equal heating of different parts of the atmosphere

46- The absorption of ink by blotting paper involves:

Siphon action

Diffusion of ink through the blotting

Capillary action phenomenon

Viscosity of ink

48- Sun and other stars are virtuously huge nuclear explosion chambers producing a large amount of head and light yet, we do not hear any of the explosions because A. Heat and light are electromagnetic:

Sound waves get attenuated completely before they reach the earth

The outer space is an absolute vaccum

The process involved in the interior of the sun and the starts relate to atomic and subatomic particles and not molecules and their vibration

Heat and light are electromagnetic

49- It is easier to roll a stone up a sloping road than to lift it vertical upwards because:

Work done both is same but the rate of doing work is less in rolling

Work done in rolling a stone is less than in lifting it

Work done in lifting the stone is equal to rolling it

Work done in rolling is more than in lifting

51- Which one of the following can be used to focus sunlight?

Concave mirror

Convex mirror

Concave lens

Plane mirror

53- Air bubble in water shines because of the phenomenon of:

Diffraction

Total internal reflection

Dispersion

Refraction

54- The energy of a body due to its motion is called:

Kinetic energy

Potential energy

Heat energy

Light energy

55- Sun and the other stars are virtually huge nuclear explosion chambers producing a large amount of heat and light. Yet, we do not hear any of the explosion because of:

Sound waves get attenuated completely before they reach the earth

Heat and light are electriomagnetic radiations and travel much faster than sound

The outer space is an absolute vacuum

The process involved in the interior of the sun and the stars relate to atomic and subatomic particles and not molecules and their vibrations

56- The silvered surface of thermos flask prevents the transfer of heat by:

Convection

Reflection

Radiation

Conduction

57- When abeam of light is passed through a transparent medium, however clear or homogeneous the medium may be, there is always a certain amount of light scattered sideways, out of the beam. This is known as:

Raman effect

Dispersion

Rayleigh scattering

None of these

60- When the wind blows at high velocity, rooftops are blown off because of pressure:

Is exerted by air from outside

Outside is more than inside the roof

Increase due to wind velocity

Inside is more than outside the roof

61- Sound travels faster in:

Dry air than in water

Wood than in iron

Hydrogen than in water

Iron than in air

62- Ice floats on water because the density of ice is less than that of water, out of the following what part of giant icebergs remains above water?

1/2

1/10

3/4

1/4

63- When light enters from rare to denser medium, it bends towards the normal line, it is called:

Absorption of light

Diffraction of light

Refraction of light

Reflection of light

64- Choke coil is a coil of:

Low resistance and high inductance

High resistance and low inductance

Low resistance and low inductance

High resistance and high inductance

65- Which of the following colour of light travel through, glass with minimum speed?

Red

Green

Violet

Yellow

66- A Polaroid is:

A device used in the polarimeter

An adjustable shutter

A red light filter

A device used for analysing polarized light

67- The tendency of a liquid drop to contract and occupy minimum area is due to:

Surface tension

Vapour pressure

Viscosity

Density

68- Soldier crossing a suspension bridge, always break steps, in case the frequency of vibration of their marching should coincide with that of the bridge and this is because of the phenomenon of:

Reverberation of sound

Echolocation od sound

Resonance of sound

Refraction of sound

69- Electromagnetic waves travel with:

Speed of sun rotation

Speed of sound

Speed of light

Speed of earth rotation

70- Which of the following gives the correct descending order of elasticity in the substances?

Steel, silver, rubber

Silver, rubber, steel

Rubber, silver, glass

All have equal elasticity

71- Conductors, insulators and semi-conductors differ from each other due to the property of:

Formation of crystal lattice

Mutual width of their energy gaps

Ability of the current they carry

Binding energy of their electrons

72- On which principle does the tape-recorder function?

Electromagnetic induction

Boyle's Law

Electro valency

Gay Lussac's law of combining volumes

74- When a constant force is applied to a body it moves with uniform:

Velocity

Acceleration

Speed

Momentum

77- Prefix deca represents:

10 Raised to power 3

10 Raised to power 2

10 Raised to power -1

10 Raised to power 1

79- Which branch of science plays an important role in the development of technology and engineering?

Physics

Geology

Chemistry

Biology

80- One pico stands for:

10 Raised to power -15

10 Raised to power -12

10 Raised to power -9

10 Raised to power -6

83- The unit of force is______ and its symbol is______. Which is the correct pair?

Newton, N

Newton, n

Newton, N

Newton, n

85- Smaller the least count of the instrument more is the measurement:

Precise

Accurate and precise

Accurate

None of these

86- Dimensional analysis is helpful for:

Deriving a possible formula

Checking the homogeneity of a physical equation

Verification of laws

Only a and b correct

89- 1024 can be written in scientific notation as:

1/0.00097

0.000976

1.024x103

2 Raised to power 10

90- The error in measurement may occur due to:

Inappropriate method

Inexperience of a person

The faulty apparantus

Due to all reasons in a, b and c

92- Three students measured length of a needle with meter rod and recorded as: (i) 0.2145m (ii) 0.21m (iii) 0.214m. Which one is correct record?

Only (ii)

Both (i) and (ii)

Only (iii)

Only (i)

95- In any measurement the significant figures are:

All accurately known and all doubtful digits

Only doubtful digits

Only accurately known digits

All accurately known digits and the first doubtful digit

97- Total uncertainty, in result obtained from the subtraction of two measurement, is equal to:

Division of their absolute uncertainties

Difference of their absolute uncertainties

Product of their absolute uncertainties

Sum of their absolute uncertainties

98- The uncertainty in measurement may occur due to:

Inadequate of technique

Natural variation of the object to be measured

Limitation of an instrument

All given in a, b and c

100- An ideal standard of measurement of a base quantity has characteristics:

Accessible

Transportable

Invariable

Only a and b are correct

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