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Quiz 28
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Q.1
Pipelines in cold countries often burst in winter, because
Water freezes and expands in its volume
Temperature of ice is less than that of water
Pipelines contract in their volume
Pipelines expand due to freezing
Q.2
A mirage occurs because of
Reflection by hot ground
Total internal reflection by layers of air
Interference of light
Diffraction of light
Q.3
Optical fibres are based on the phenomenon of
Interference
Dispersion
Diffraction
Total Internal Reflection
Q.4
Convex mirror is generally used in ________
Solar cookers
Opthalmoscope
Reflector for head light
Rear view mirror
Q.5
In which one of the following the phenomenon of total internal reflection of light is used ?
Formation of mirage
Working of binoculars
Formation of rainbow
Twinkling of stars
Q.6
The reflector of a search light is a :
Convex mirror
Concave mirror
Plane mirror
Cylindrical mirror
Q.7
In severe winter, in cold countries water pipes burst because
Water expands on freezing
Contraction of water pipes
High atmospheric pressure
Combined effect of all the above three
Q.8
The angle between the ________ and the incident ray is called the angle of incidence.
Surface
Normal
Tangent
Reflected ray
Q.9
Which type of mirror is used in the head lights of vehicles ?
Plane mirror
Concave mirror
Convex mirror
Parabolic mirror
Q.10
If objects appear enlarged and inverted in a rear view mirror, then which type of mirror is used?
Concave
Convex
Cylindrical
Plane
Q.11
Optical Fibre technology works on which of these principles of Physics?
Bernoulli's Principle
Newton's law of Motion
Total internal reflection of Light
Photoelectric effect
Q.12
What is the reason for formation of Mirage in desert?
Refraction of light
Reflection of light
Total internal reflection of light
Both Refraction and Total internal reflection of light
Q.13
Railway tracks are banked on curves so that
Necessary centrifugal force may be obtained from the horizontal component of the weight of the train
No frictional force may be produced between the tracks and the wheels of the train
Necessary centripetal force may be obtained from the horizontal component of the weight of the train
The train may not fall down inwards
Q.14
The density of the liquid when heated
Decreases
Increases
Does not change
May increase of decrease depending on pressure
Q.15
A periscope works by the principle of
Total internal reflection
Refraction
Diffraction
Reflection
Q.16
A periscope works on the principle of
Refraction
Total internal reflection
Diffraction
Reflection
Q.17
Stars appears to move from east to west because
All stars move from east to west
The earth rotates from west to east
The earth rotates from east to west
The background of the stars moves from west to east
Q.18
Pa(Pascal) is the unit for
Thrust
Pressure
Frequency
Conductivity
Q.19
Large transformers, when used for some time, become very hot and are cooled by circulating oil. The heating of the transformer is due to:
The heating effect of current alone
Hysteresis loss alone
Both the heating effect of current and hysteresis loss
Intense sunlight at noon
Q.20
Nuclear sizes are expressed in a unit named
Fermi
Angstrom
Newton
Tesla
Q.21
Planets do not twinkle because
They emit light of a constant intensity
Their distance from the earth does not change with time
They are very far away from the earth resulting in decrease in intensity of light
They are nearer to earth and hence we receive a greater amount of light.
Q.22
Metals are good conductors of electricity because:
They contain free electrons.
The atoms are lightly packed.
They have high melting point.
All of the above.
Q.23
Light year is a unit of
Time
Distance
Light
Intensity of light
Q.24
Mirage is due to:
Unequal heating of different parts of the atmosphere
Magnetic disturbances in the atmosphere
Depletion of ozone layer in the atmosphere
Equal heating of different parts of the atmosphere
Q.25
Which of the following terms is not used in the field of physics?
Latent heat
Nuclear fusion
Refractive index
Stock value
Q.26
Rainbow is produced when sunlight fall on drops of rain. Which of the following physical phenomena are responsible for this?
I.Diffusion
II.Refraction
III.Internal reflection
I, II and III
I and II
II and III
I and III
Q.27
A wheel-barrow is an example of
Class III lever
Pulley system
Class I lever
Class II lever
Q.28
Let a thin capillary tube be replaced with another tube of insufficient length then, we find water
will overflow
will not rise
depressed
change its meniscus
Q.29
Which of the following is not a part of a CRT ?
Phosphor screen
Shadow mask
Electron gun
Gas plasma
Q.30
Slip rings are usually made of
Aluminium
Copper
Phosphor Bronze
Carbon
Q.31
The size of gear is usually specified by
Pitch circle diameter
Diametral pitch
Pressure angle
Circular pitch
Q.32
Which of the following is a compound machine?
Screw
Knife
Bicycle
Ramp
Q.33
Light from the Sun reaches us in nearly
2 minutes
4 minutes
8 minutes
16 minutes
Q.34
Radiocarbon is produced in the atmosphere as a result of
Collision between fast neutrons and nitrogen nuclei present in the atmosphere.
Action of ultraviolet light from the sun on atmospheric oxygen.
Action of solar radiations particularly cosmic rays on carbon dioxide present in the atmosphere.
Lightning discharge in atmosphere.
Q.35
It is easier to roll a stone up a sloping road than to lift it vertical upwards because
Work done in rolling is more than in lifting.
Work done in lifting the stone is equal to rolling it.
Work done in 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.
Q.36
Natural radioactivity was discovered by
Marie Curie
Ernest Rutherfor
Henri Becquerel
Enrico Fermi
Q.37
Planets are
luminous heavenly bodies revolving around a star
non-luminous heavenly bodies
luminous heavenly bodies that twinkle
luminous heavenly bodies that do not twinkle
Q.38
One nanometer is equal to
10
-6
m
10
-8
m
10
-9
m
10
-5
m
Q.39
A single fixed pulley is used to draw water from a well because
Efficiency is 100%
Velocity ratio is low
Mechanical advantage is high
Force is applied in a convenient direction
Q.40
A fixture is defined as a device which
Is used to check the accuracy of workpiece
Holds and locates a workpiece and guides and controls one or more cutting tools
Holds and locates a workpiece during an inspection or for a manufacturing operation
All of the above
Q.41
What type of simple machine is an axe?
Lever
Wedge
Both A & B
The screw
Q.42
The safest hammers are those with heads that are
Cast steel and chiseled
Alloy and drop-forged steel
Welded and alloyed
Chiseled and drop forged
Q.43
The function of ball bearings in a wheel is :
To increase friction
To convert kinetic friction into rolling friction
To convert static friction into kinetic friction
Just for convenience
Q.44
Gear finishing operation is called
Burnishing
Hobbing
Shaping
Milling
Q.45
Which of the following is an example for cantilever beam?
Diving board
Bridge
See-saw
Common balance
Q.46
A machine powered by rotating blades is a
Fumerole
Turbines
Solar panel
None of the above
Q.47
The absorption of ink by blotting paper involves:
Viscosity of ink
Capillary action phenomenon
Diffusion of ink through the blotting
Siphon action
Q.48
Siphon will fail to work if:
The densities of the liquid in the two vessels are equal.
The level of the liquid in the two vessels are at the same height.
Both its limbs are of unequal length.
The temperature of the liquids in the two vessels are the same.
Q.49
If a copper wire is increased to double its length, its resistance will become
Four times
One–fourth
Double
Half
Q.50
The filament of electric bulb is made up of :
Copper
Nichrome
Lead
Tungsten
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