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Quiz 27
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Q.1
A permanent magnet can affect
Magnets
Electromagnets
Both A & B
None of the above
Q.2
In total internal reflection, the light travel from
Rarer to denser medium and it occurs with no loss of intensity
Denser to rarer medium and it occurs with no loss of intensity
Rarer to denser medium and it occurs with loss of intensity
Denser to rarer medium and it occurs with loss of intensity
Q.3
Cloudy nights are warmer compared to clear cloudless nights, because clouds mainly
Absorb heat from the atmosphere send it towards earth
Prevent cold waves from the sky descending on earth
Reflect back the heat given by earth
Produce heat and radiate it toward earth
Q.4
Two stones of different masses are dropped simultaneously from the top of a building
Smaller stone reaches the ground earlier
Larger stone reaches the ground earlier
Both the stones reach the ground at the same time
Depends on the composition of the stone
Q.5
A man jumping out of a moving train is thrown
Forward
Backward
Sideways
None of these
Q.6
A piece of ice is floating in water kept in a beaker. When all the ice melts the level of water will
First rise and then fall
Fall
Remain the same
Rise
Q.7
The magnitude of buoyant force depends on the ________ of the fluid.
Mass
Temperature
Volume
Density
Q.8
A gas thermometer is more sensitive than a liquid thermometer because a gas :
Is lighter than liquid
Expands more than a liquid
Is easy to obtain
Does not change state easily
Q.9
What is the SI unit of temperature?
Kelvin
Joule
Celsius
Fahrenheit
Q.10
What is the principle of a ''Life Jacket"?
It provides oxygen to a drowning person
It increases the volume of the person to keep him afloat
It decreases the volume of the person to keep him afloat
The person can sit on it like a raft
Q.11
When a piece of stone is immersed in water, it displaces water of equal
Density
Specific gravity
Mass
Volume
Q.12
When a ship enters the sea from a river
It rises a little
It sinks a little
It remains at the same level
It rises or sinks depending on the material it is made of
Q.13
The apparent weight of a man in a lift is less the real weight when :
The lift is going up with an acceleration
The lift is going down with uniform speed
The lift is going up with uniform speed
The lift is going down with an acceleration
Q.14
A freely suspended magnet remains horizontal at
The magnet equator
The magnetic north pole
The magnetic south pole
The geographic pole
Q.15
An object at rest will remain at rest and an object in motion will remain in motion until and unless it is acted upon by an external force. This is Newton's
First law
Second law
Third law
Fourth law
Q.16
A solid needle placed horizontally on the surface of the water floats due to
Capillary action
Water pressure
Surface tension of water
Viscosity of water
Q.17
Purity of a metal can be determined with the help of
Pascal's law
Boyle's law
Archimedes principle
Conservation of mass principle
Q.18
Earliest thermometer was developed by
Celsius
Fahrenheit
Kelvin
Galileo
Q.19
The absolute zero is a temperature at which ________
Molecular motion in a gas would cease
Water freezes
All gases become liquid
All gases become solid
Q.20
Absolute Zero is defined as
The temperature at which all molecular motion ceases
At which water boils at 298K
At which liquid Helium boils
At which the volume becomes zero
Q.21
At what temperature (in degree Celsius), the numerical values on Celsius and Fahrenheit scales become equal?
–40
40
273
–273
Q.22
The temperature which has the same reading on both Fahrenheit and Celsius scales is
40°
–40°
0°
32°
Q.23
Convex mirrors are used as a rear view mirror in motor cycles because
It forms real image
It forms erect (upright) image
It forms smaller image as compared with object
All of the above
Q.24
It is easier for a man to swim in sea water, than in river water because
The density of sea water is lesser than the density of river water
The density of sea water is more than the density of river water
The sea is-deeper than the river
The sea is wider than the river
Q.25
At what temperature do the Fahrenheit and Celsius scales give the same reading?
212 degrees
32 degreees
-40 degreees
0 degreees
Q.26
The temperature of a liquid is 32° F. What is its temperature in Celsius scale?
32° C
0° C
100° C
212° C
Q.27
A balloon filled with hydrogen will
Continue going upwards uninterrupted
Reach a particular height and remain floating
Burst after reaching some height
Reach a particular height and start coming down
Q.28
Buoyancy depends on
The mass of the liquid displaced
The mass of the body
The depth to which the body is immersed
The shaped of the body
Q.29
An optically plane surface reflects a beam of light
As a parallel beam in one direction
As diffused beams in all directions
As parallel beams in all directions
As a diffused beam in one direction
Q.30
The focal length of a concave mirror with a radius of curvature of 20.0 cm is :
20 cm
5 cm
10 cm
15 cm
Q.31
Ice cubes are added to a glass of pure water and a glass of pure alcohol. The ice would be
At a higher level in water
At a higher level in alcohol
At the same level in both
Floating in alcohol and sinking in water
Q.32
The type of mirror used in automobiles to see the traffic on the rear side is
Concave
Plano-Convex
Plane
Convex
Q.33
If you look into a mirror and find that the image (your reflection) is smaller than you, then the type of the mirror is:
Concave mirror
Convex mirror
Plano-concave mirror
Plane mirror
Q.34
At what temperature (in Fahrenheit) pure water freezes?
32
0
48
37
Q.35
On the Kelvin scale, the melting point of ice is
373K
100K
273K
0 K
Q.36
A convex mirror of focal length f (in air) is immersed in a liquid (u=4/3). The focal length of the mirror in the liquid will be :
F
(4/3)f
(3/4)f
(7/3)f
Q.37
To convert temperature from Celcius to Kelvin scale, you must ________ the given temperature.
Subtract 273
Multiply 273
Add 273
Divide by 273
Q.38
0°K is equivalent to
273°C
– 273°C
0°C
100°C
Q.39
The type of mirrors used in the headlamp of cars is
Parabolic concave
Plane
Spherical convex
Cylindrical concave
Q.40
Which one of the following reflects back more sunlight as compared to other three?
Sand desert
Land covered with fresh snow
Prairie land
Paddy crop land
Q.41
After reflection from a plane mirror the word will look like.
AMBULANCE
ECNALUBMA
AMBULA CE
AWBULANCE
Q.42
The snow on the mountains does not melt all at once when it is heated by the sun because:
It becomes very hard
It reflects most of the heat from the sun
It has a low specific heat capacity
It has a high latent heat of fusion
Q.43
Total internal reflection can not take place when light goes from :
Glass to water
Water to glass
Water to air
Glass to air
Q.44
A rear-view mirror for driving is
Plain
Concave
Convex
Inverted
Q.45
The phenomenon which causes mirage is
Interference
Diffraction
Polarisation
Total internal reflection
Q.46
Rear view mirror of car is convex or concave?
Convex
Concave
Both A & B
Can't be determined
Q.47
In very cold countries alcohol is used as a thermometric liquid because
Alcohol is a poor conductor of heat
Alcohol can be coloured for its level to be seen easily
Its freezing point is very low
It will not stick to the glass tube
Q.48
Shaving mirror is
Convex
Concave
Plane
Parabolic
Q.49
What changes will happen to a bowl of ice and water kept at exactly zero degree Celsius ?
All ice will melt
All water will become ice
No change will happen
Only some ice will melt
Q.50
A small gap is left at the joints of rails in a railway track to
Avoid the tracks being distorted due to seasonal temperature variation
Avoid the heating of tracks to high temperature
Control the speed of train
Keep the rails equidistant
0 h : 0 m : 1 s
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