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Quiz 4
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Q.1
Gasoline is useful in cars because it has
Chemical potential energy
Electrical potential energy
Gravitational potential energy
Kinetic energy
Q.2
Sun appears red in colour at sunrise and sunset due to
The fact that sun emits only red colour at that time
Red light having longer wave length scatters away
That sun comes out of the mountains
That all other colours scatter away except red
Q.3
1 Joule is Equal to
10^3 ergs
10^6 ergs
10^7 ergs
10^5 ergs
Q.4
Which one of the following instruments is used to study dispersion of light ?
Microscope
Telescope
Spectrometer
Photometer
Q.5
Rainbows are produced when sunlight :
Incident on rain drops hanging in the atmosphere is dispersed after suffering refraction
Incident on rain drops hanging in the atmosphere is dispersed after suffering refraction and internal reflection.
Incident on raindrops hanging in the atmosphere is dispresed after suffering reflection.
None of the given statements is correct.
Q.6
If the velocity of a body is halved its kinetic energy ________
Become 4 times
Becomes 1/4 th
Is also doubled
Becomes half
Q.7
Solar energy is converted into chemical energy during
Transpiration
Photosynthesis
Diffusion
Osmosis
Q.8
Danger signals are generally red as red light
Is least bright
Undergoes least deviation
Has lowest velocity
Gives comfort to eye
Q.9
In radio-communication, the signals emitted by transmitting antenna are reflected on
Stratosphere
Ozonosphere
Ionosphere
Troposphere
Q.10
Kinetic energy depends on
The velocity or speed of the moving body.
The mass of the moving body
The pressure of the moving body
Both mass and velocity of the moving body
Q.11
The device used to convert solar energy into electricity is
Photovoltaic cell
Daniell cell
Electrochemical cell
Galvanic cell
Q.12
A mass of 20 kg is at a height of 8 m above the ground. Then the potential energy possessed by the body is: [Given g = 9.8 m/s
2
]
1568 J
1568 C
1568 W
1568 N
Q.13
Why does the sea appear blue in colour?
Reflection of the sun light from water surface
Interference of the sun light from water surface
Scattering of the sunlight by water molecules
Refraction of the sun light
Q.14
Refractive Index of glass with respect to water is
4/3
9/8
2/3
8/9
Q.15
A person lifts luggage of 20 kg from the ground and puts it on his head 2m above the ground. Calculate the work done by him. (g = 10 )
20 J
400J
200J
40J
Q.16
Electric Motor converts ________ energy to mechanical energy
Sound
Mechanical
Chemical
Electrical
Q.17
Total number of colours exists in sunlight
5
7
9
10
Q.18
When white light passes through a glass prism we get a spectrum on the other side of the prism. In the emergent beam the ray which is deviated least is
The violet ray
The red ray
The green ray
The blue ray
Q.19
A dynamo is a device which
Creates mechanical energy
Creates electrical energy
Converts mechanical energy into electrical energy
Converts electrical energy into mechanical energy
Q.20
Which one of the following is responsible for the working of Newton's colour disc experiment ?
Formation of pure spectra
Formation of impure spectra
Persistence of vision
Principle of complementary colour
Q.21
Mist is caused by
Dry ice
Ice at low temperature
Water vapour at low temperature
Carbon-monoxide in solid form
Q.22
Red light is used for signals because it has
Long wavelength
High intensity
High frequency
Low refraction in the medium
Q.23
The splitting of white light into its components is due to:
Reflection
Refraction
Transmission
Dispersion
Q.24
In which of the following cases, kinetic energy is being used in performing work ?
Paddling the bicycle to cover a distance
Driving a car to cover a distance
Wind mill grinding wheat grain
Rowing a boat in the lake
Q.25
A cyclist leans inwards when he is negotiating a curve so that
He may increase his speed
His weight may be reduced
Necessary centripetal force may be available from the horizontal component of the normal reaction due to the track to maintain the curved motion.
No frictional force may be produced between the wheels and the axle
Q.26
A thin oil film on a water surface appears coloured because of
Reflection
Interference
Diffraction
Polarization
Q.27
Velocitation is the tendency to
Be traveling at a speed that is faster than perceived
Be traveling at a speed that is slower than perceived
Both A & B
None of the above
Q.28
Skids occur when the brakes are applied so hard that the front or rear wheels lose traction are called as
Cornering
Blowout
Power
Braking
Q.29
A dynamo is used to convert
Mechanical energy into electrical energy
Electrical energy into mechanical energy
Electrical energy into magnetic energy
Magnetic energy into mechanical energy
Q.30
An object which absorbs all colours and reflects none appears:
White
Grey
Blue
Black
Q.31
Microphone is a device which transforms the
Sound signal into current signal
Current signal into sound signal
Sound signal into light signal
Light signal into sound signal
Q.32
Which colour is the complementary colour of yellow ?
Blue
Green
Orange
Red
Q.33
Which of the following is used to split white light into different colours ?
Glass slab
Convex lens
Concave lens
Prism
Q.34
If an object is thrown upwards, what will be its velocity, when it reaches its maximum height?
0 m/s
4.9 m/s
14.7 m/s
20 m/s
Q.35
The blue colour of sky is due to
Reflection of sunlight
Refraction of sunlight
Scattering of shorter wavelengths of sunlight in the atmosphere
Scattering of longer wavelengths of sunlight in the atmosphere
Q.36
If the velocity-time graph of a particle is represented by y = mt + c, then the particle is moving with
Constant speed
Constant velocity
Constant acceleration
Varying acceleration
Q.37
Which one of the following is applicable to collision-coalescence process of precipitation?
Clouds which do not extend beyond the freezing level
Clouds which extend beyond the freezing level
All types of clouds
Cirrocumulus cloud
Q.38
During the motion of a projectile fired from the earth surface, ________
Its kinetic energy remains constant
Its momentum remains constant
Vertical component of its velocity remains constant
Horizontal component of its velocity remains constant
Q.39
Force of impact is the force
By the objects weight
By the speed of the object
When the objects meet
None of the above
Q.40
A man standing at the top of a tower has two spheres A and B. He drops sphere A downwards and throws sphere B horizontally at the same time. Which of the following is correct ?
Both the spheres will reach the ground simultaneously.
A will reach the ground first.
B will reach the ground first.
The question is incomplete because the masses of the spheres are not given.
Q.41
The quantity that is not conserved in an inelastic collision is
Momentum
Kinetic Energy
Total Energy
All of these
Q.42
A photo-electric cell converts
Mechanical energy to electric energy
Heat energy to mechanical energy
Light energy to chemical energy
Light energy to electrical energy
Q.43
What is the change in the angular momentum of a system as per the Law of Conservation of Angular momentum, if the total external torque acting is zero?
Remains constant
Becomes zero
Increases exponentially
None of the above
Q.44
Conversion of heat into electrical energy is achieved by using :
Ammeter
Hydrometer
Voltmeter
Thermocouple
Q.45
In sunlight a rose appears red. In green light, the same rose appears
Red
Black
Green
Yellow
Q.46
The sky appears blue because
All colours interfere to produce blue
In white light, the blue component dominates
The atmosphere scatters blue colour more than the others
It is actually blue
Q.47
What colour does blue and yellow make?
Green
Black
Red
White
Q.48
Knot is a measure of
The speed of ship
The curvature of spherical objects
Solar radiation
Intensity of earthquake shock
Q.49
A pilot has to release the bomb to hit a target
Right above the target
Beyond the target
Before the target
None of these
Q.50
The phenomenon of light associated with the appearance of blue colour of the sky is
Interference
Reflection
Refraction
Scattering
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