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Quiz 20
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Q.1
The weakest of all fundamental forces is
Gravitational force
Electrostatic force
Magnetic force
Nuclear force
Q.2
Fish and other aquatic creatures can live inside a deep frozen pond because
Fish are cold-blooded animals
Ice is a bad conductor of heat
There will always be water just beneath the ice level
They can adapt themselves to live in ice
Q.3
The density of a gas is maximum at
Low temperature, low pressure
Low temperature, high pressure
High temperature, low pressure
High temperature, high pressure
Q.4
The unit of force is a
Derived Unit
Basic Unit
Fundamental Unit
None of the above
Q.5
Atmospheric pressure exerted on earth is due to
Gravitational pull
Rotation of earth
Revolution of earth
Uneven heating of earth
Q.6
The speed of light will be minimum while passing through
Water
Vaccum
Air
Glass
Q.7
The force which makes a vehicle to stop when break is applied is called
Gravitational force
Vanderwalls force
Frictional force
Covalant force
Q.8
The rate of flow of electric charge is measured in
Ampere
Coulomb
Ampere/coulomb
Ampere-coulomb
Q.9
A device which is used to limit the current in an electrical circuit is called a
Grid
Fuse
Hub
Conductor
Q.10
Ohm's law is valid in case of
Semiconductor
Conductor
Superconductor
Insulator
Q.11
Electrical burns occur principally because of
Radiation pulses of the electricity
The heat generated by the flow of electrical current through the body
The high energy of electrons
All of the above
Q.12
Lakes freeze in cold countries in winter, leaving the water underneath at
0°C
0°F
4°C
4°F
Q.13
A bimetal made copper and iron strips welded together is straight at room temperature. It is held vertically with iron strip towards left and copper strip towards right. If this bimetal is heated, it will
Remain straight
Bend towards right
Bend towards left
None of these
Q.14
What is the SI unit of Force?
Pascal
Boyle
Newton
Watt
Q.15
What measures Air pressure?
Barkometer
Bolometer
Spectrometer
Barometer
Q.16
Materials that allow electricity to flow are called
Insulators
Conductors
Electron flows
Stimulators
Q.17
The fundamental scientific principle in the operation of battery is
Acid-base interaction
Dialysis
Dissociation of electrolytes
Oxidation-reduction
Q.18
The SI unit of resistance is:
Newton
Coulomb
Ohm
Joule
Q.19
Electrical Energy is the energy of
Protons
Neutrons
Electrons
All the above
Q.20
Thermal expansion of materials arises from
Strong bonds
Thermal vibrations
Weak bonds
Asymmetry of potential energy curve
Q.21
If a band is played on the moon the sound will
Reverberate
Be heard by us faintly
Be heard upto 10km from it
Not be heard at any distance at all from it
Q.22
The intensity ratio of waves is 25 : 9. What is the ratio of their amplitudes?
50 : 18
25 : 9
3 : 5
5 : 3
Q.23
The velocity of sound in air
Decreases with increase of temperature
Increases with decrease of temperature
Does not depend on temperature
Decreases with decrease of temperature
Q.24
The rice is cooked more quickly in a pressure cooker because
It is covered.
Less quantity of water is used.
None of these
Water boils at a higher temperature under pressure.
Q.25
If the current flowing through a circuit is 0.6 A for 6 mins, the amount of electric charge flowing through it is ________
360C
216 C
60 C
36 C
Q.26
As water is cooled from 4 deg C to 0 deg C, its density
Increases
Decreases
Remains same
None of the above
Q.27
For which of the following substances, the resistance decreases with increase in temperature?
Pure silicon
Copper
Nichrome
Platinum
Q.28
The S.I. unit of electric charge is :
Ampere
Coulomb
E.s.u
Kelvin
Q.29
The colours of stars depend on their
Temperature
Distance
Radius
Atmospheric pressure
Q.30
The substance which conducts current in the solid state is
Diamond
Graphite
Iodine
Sodium chloride
Q.31
Infrasonic sound has a frequency lower than
5 Hz
15 Hz
20 Hz
32 Hz
Q.32
When a vibrating tuning fork is placed on a table, a loud sound is heard. This is due to :
Reflection
Refraction
Forced vibrations
Damped vibrations
Q.33
Quality of a musical note depends on
Fundamental frequency
Amplitude of the wave
Harmonics present
Velocity of sound in the medium
Q.34
Hertz is the SI unit of
Weight
Power
Pressure
Frequency
Q.35
What is the SI unit of intensity of sound?
Decibel
Newton
Heartz
Tesla
Q.36
Sound cannot pass through
Water
Steel
Air
Vacuum
Q.37
Indicate the false statement about the resistance of a wire
It depends on material of wire
It is directly proportional to the length of wire
It is directly proportional to the area of cross-section of wire
Resistance of metallic wire increases with increase in temperature
Q.38
The magnitude of current flowing between two end points of a conductor is proportional to the potential difference between them and is called as:
Avogadro's law
Rault's law
Ohms law
Faraday's law
Q.39
Electric current is measured by which instrument?
Voltmeter
Ammeter
Barometer
Sinometer
Q.40
Noise is measured in
Watt
REM
Centigrade
Decibel
Q.41
Sound following a flash of lightning is called
Stoning
Bolting
Thunder
Cloud clash
Q.42
Acceptable noise level for human ear
> 85 db
= 85 db
< 85 db
None of the above
Q.43
The velocity of the sound is highest in
Metal
Air
Water
Vacuum
Q.44
The ordinary and maximum tolerance limit of sound by human being is
50 db to 70 db (decibel)
60 db to 80 db (decibel)
65 db to 75 db (decibel)
70 db to 85 db (decibel)
Q.45
Ocean currents are an example of
Convection
Conduction
Insulation
Radiation
Q.46
The quality or tone of a musical sound produced by a stringed instrument depends on
Frequency of vibration
Length of the strings in the instrument
Amplitude of vibration
Wave form of the sound
Q.47
What is the SI unit of electric current?
Newton
Joule
Ampere
Watt
Q.48
Man perceives sound vibrations in the frequency ranges of
0 – 5 Hz
6 – 10 Hz
11 – 20 Hz
20 – 20000 Hz
Q.49
Instrument used to study the behaviour of a vibrating string is :
Barometer
Hydrometer
Hygrometer
Sonometer
Q.50
Among the following materials sound travels fastest in
Steel
Air
Vacuum
Water
0 h : 0 m : 1 s
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