CBSE Questions for Class 11 Engineering Physics Physical World Quiz 3 - MCQExams.com

Mass of a body remains constant anywhere in the universe. State whether the statement is true or false.
  • True
  • False
  • Either
  • Neither
The speed of electromagnetic waves in air is
  • $$3\times10^5\;km/s$$
  • $$3\times10^6\;km/s$$
  • $$3\times10^7\;km/s$$
  • $$3\times10^8\;km/s$$
Answer the below-given question as true or false. 
It is not difficult to walk barefooted on sandy ground.
  • True
  • False
Who was the first pre-Socratic philosopher to suggest that matter could neither be created nor destroyed?
  • kepler
  • Newton
  • parmenides
  • None of these
Mass of a material varies with temperature.
  • True
  • False
  • Nither
  • Either
Which of the following class of forces is different from others?
  • Magnetic force
  • Electrical force
  • Gravitational force
  • Stretching of a spring
The branch of science which deals with nature and natural phenomena is called
  • Sociology
  • Biology
  • Civics
  • Physics
Railway tracks are banked on curves so that 
  • No frictional force may be produced between the track and the wheels
  • The train may not fall down inwards
  • The weight of the train may be reduced
  • Necessary centrifugal force may be obtained from the horizontal component of the weight of the train
The function of cement in masonry is based on the phenomenon of
  • Adhesion
  • Cohesion
  • Rigidity
  • Elasticity
  • Flexibility
Oil rises up the wick in a lamp because
  • Oil is volatile
  • Oil is very light
  • Of the surface tension phenomenon
  • Of the diffusion of oil through the wick
Challenger is the name of a
  • Space-lab
  • Space shuttle
  • Satellite
  • Rocket
To a space traveler on the moon during day time the lunar sky appers
  • Blue
  • Black
  • White
  • Red
  • Yellow
Lamps used for street lighting are connected in
  • Parallel
  • Series and Parallel both
  • Series
  • None of the above
On a rainy day
  • Dry and wet thermometer's give identical readings
  • Wet thermometer reads more than dry thermometer
  • Wet thermometer reads slightly less than the dry thermometer
  • Wet thermometer reads much less than the dry thermometer
Lightning is observed earlier than the sound is heard because
  • Light travels faster than sound
  • Thunder is produced later
  • Thunder is produced simultaneously but it travels after light has reached the observer's eyes
  • Man's sense of vision is sharper than his sense of hearing
  • None of the above
A glass tumbler containing ice shows droplets of water on the outer surface because
  • The outer surface of the tumbler shows hygroscopic effect
  • Water from inside oozes out through the wall of the tumbler
  • The moisture in the air on coming in contact with the cold surface of the tumbler condenses in the form of droplets of water
  • (A) and (B)
Sometimes the tubes in the well-inflated tyres of a cycle left in the sun burst open
  • Because the pressure of air inside the tube increases
  • Because the volume of air inside the tube increases due to rise in its temperature
  • Because the tube containing air melts
  • Because the volume and the pressure both increase
  • None of the above
A red and a green pencil are taken in a room illuminated with green light. In the room
  • Both pencils will appear dark
  • Pencils will appear as red and green respectively
  • Red pencil will appear dark and green pencil as green
  • Red pencil will appear red and green pencil dark
What metallic wire is fused in glass?
  • Copper
  • Platinum
  • Tungsten
  • Silver
The common balance works on the principle of equality of
  • Forces
  • Moments of forces
  • Masses
  • Masses of pans
The instrument connected with the recording and reproduction of sound is called
  • Gramophone
  • Headphone
  • Hydrophone
  • Ear phone
  • None of the above
Light pollution is caused when
  • the ozone layer is damaged
  • too much of light sources are used unnecessarily
  • light sources pointing up to the sky rather than down to the earth
  • sources of light are polluted
Astronomers have discovered a bizarre, hexagon-shaped feature in the clouds of Saturn near the planet's north pole. The feature was first seen in images sent by the
  • Voyager spacecraft
  • Casis spacecraft
  • Messenger spacecraft
  • Pathfinder spacecraft
Sudden fall of a barometer reading indicates
  • Storm
  • Dry weather
  • Fine weather
  • Cold weather
If two substances of equal volumes but of different densities are dropped from the same height simultaneously, then
  • The body of lower density will reach the earth earlier
  • Both the bodies will reach the earth simultaneously
  • The body of higher density will reach earlier
  • It depends upon the place
The output of a given windmill
  • Increases with an increase in wind velocity
  • Decreases with an increase in wind velocity
  • Is independent of wind velocity
  • Cannot be determined
A sharp knife cuts much better than a blunt one because
  • Area of sharp knife is much less than the area of the blunt one
  • Sharp knife is brighter
  • Sharp knife is colder
  • Sharp knife is costly
Among the following liquids, the pressure inside them at a given depth is the highest in ______ at a constant temperature.
  • fresh water
  • petrol
  • sea water
  • alcohol
Which of the following is used to punch holes in thick metallic block?
  • Drilling machine
  • Hydraulic press
  • Hammer and anvil
  • All the above
In a microwave oven the device used for generating microwaves is
  • Stirrer fan
  • Metal wall
  • Magnetron
  • Cyclotron
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