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Quiz 8
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Q.1
Bubbles of air rise up through liquids due to
Surface tension and adherence
Viscosity and buoyancy
Air current over the liquid and buoyancy
Up thrust and surface tension
Q.2
If an ordinary glass tube and a glass capillary tube are both dipped in a beaker of water, water rises in
Both
Only the glass tube
Only the capillary tube
Neither
Q.3
The velocity of falling rain drops attains a terminal value because of
Surface tension
Air current
Upward thrust due to air
Viscous force exerted by air
Q.4
Which one is the unit of surface tension of a liquid
Newton /m
2
Electron volt /cm
2
Joule/ mm
None of the above
Q.5
Which of the following liquids has the least density ?
Fresh water
Salt water
Petrol
Mercury
Q.6
A needle or a pin floats on the surface of water because of
Surface tension
Surface energy
Viscosity
Adhesive force
Q.7
Materials for rain proof coats and tents owe their water proof properties to
Surface tension
Viscosity
Specific gravity
Elasticity
Q.8
Which of the following liquids is most viscous?
Oil
Milk
Water
Petrol
Q.9
Small bubbles are perfectly spherical because of
Gravity
Pressure
Viscosity
Surface tension
Q.10
The recoiling of gun is an example of which of the following?
Law of Conservation of Angular Momentum
Law of Conservation of Linear Momentum
Conversion of Kinetic Energy to Potential Energy
Law of Conservation of Energy
Q.11
Surface tension in a liquid is due to :
Adhesive force betweenmolecules
Cohesive force between molecules
Gravitational force between molecules
Electrical force between molecules.
Q.12
A boat loaded with rocks floats in the middle of a swimming pool. A man in the boat throws the rocks overboard. The level of water in the pool will
Increase
Decrease
Remains the same
First decrease and then increase
Q.13
A small drop of oil spreads over water because :
Oil has a higher surface tension
Water has a higher surface tension
Oil has a higher viscosity
Water has a higher viscosity
Q.14
The surface tension of water on adding detergent to it
Increases
Decreases
No change
Becomes zero
Q.15
Which of the following is a result of Surface tension ?
Gravitational pull
Viscosity
Capillary action
Radiation
Q.16
The odometer guage indicates
The distance travelled by a vehicle
The depth of the ocean
Pitch length
Frequency of the wave
Q.17
In a refrigerator, the cooling system should always be
At the top
At the bottom
At the middle
Can be anywhere
Q.18
Soap bubble attains spherical shape due to ________
Inertia
Pressure
Surface tension
Viscosity
Q.19
Water drops cannot stick to the oily surface due to
Lack of adhesive force
Surface tension
Cannot mix each other
Water is lighter than oil
Q.20
Pitot tube is used to measure
Static pressure
Velocity at stagnation point
Stagnation pressure
Dynamic pressure
Q.21
A spherical ball made of steel when dropped in mercury container
Sink in mercury
Will be on the surface of mercury
Will be partly immersed mercury
Will dissolve in mercury
Q.22
The oil in the wick of an oil lamp rises up due to:
Capillary action
Low viscosity of oil
Gravitational force
Pressure difference
Q.23
Fog is an example of
Gas dispersed in gas
Liquid dispersed in gas
Solid dispersed in gas
Solid dispersed in liquid
Q.24
In uniform circular motion, the linear velocity is perpendicular to
Radius
Force
Radius vector
Momentum
Q.25
A bottle of sodalime is grasped by the neck and swung briskly in a vertical circle, Near which portion of the bottle do the bubbles collect?
Near the bottom
In the middle of the bottom
Near the neck
Bubbles remain distributed uniformly
Q.26
Which liquid is the most viscous?
Water
Diesel
Milk
Oil
Q.27
Sending a frame to a group of stations is known as
Single casting
Spreading
Multicasting
Casting
Q.28
What is the full form of ''AM' regarding radio broadcasting?
Amplitude Movement
Anywhere Movement
Amplitude Matching
Amplitude Modulation
Q.29
A liquid disturbed by stirring comes to rest due to
Density
Surface tension
Viscosity
Centripetal force
Q.30
If a force acts upon two objects at rest, and having different masses for the same amount of time, then which one of the following will be the same for both the objects?
Acceleration
Kinetic Energy
Velocity
Momentum
Q.31
If a carrier wave of 1000 kHz is used to carry the signal, the length of transmitting antenna will be equal to ________.
300 m
30 m
3 m
0.3 m
Q.32
In a refrigerator what produces the cooling ?
The ice which deposits on the freezer
The sudden expansion of a compressed gas
The evaporation of a volatile liquid
None of these
Q.33
Which of the following is preferred for accelerating electrons?
Betatron
Cyclotron
Synchrotron
Van de Graft Generator
Q.34
Flywheel is an important part of a steam engine because it :
Accelerates the speed of the engine
Helps the engine in keeping the speed uniform
Decreases the moment of inertia
Gives strength to the engine
Q.35
The following particles move with same kinetic energy. Which of them has maximum momentum ?
Electron
Proton
Deutron
Alpha Particle
Q.36
Rain drops acquire spherical shape due to
Viscosity
Surface tension
Friction
Elasticity
Q.37
The fact that two large ships travelling on close parallel courses in the same direction tend to move towards each other can be explained by
Bernoulli's principle
Magnetic properties of the ship's material
Newton's third law of motion
Earth's gravitational force
Q.38
Radio waves sent out by a radio stations are reflected by
Troposphere
Stratosphere
Mesosphere
Ionosphere
Q.39
Bandwidth is the
A measure of the width of a range of frequencies
The rate of data transfer
Both a & b
None of the above
Q.40
Proton carry a
Positive Charge
Negative Charge
Variable Charge
Neutral Charge
Q.41
A capillary tube is partially dipped vertically in a vessel containing water. Due to capillarity water rises in the tube. The height of water rise in the tube can be increased by
Decreasing the radius of the capillary tube
Increasing the radius of the capillary tube
Increasing the height of water in the vessel
None of these
Q.42
Oil rises up the wick in a lamp because
Oil is very light
Of the diffusion of oil through the wick
Of the surface tension phenomenon
Of the capillary action phenomenon
Q.43
Consider the following statements :
1. There is no net moment on a body which is in equilibrium.
2. The momentum of a body is always conserved.
3. The kinetic energy of an object is always conserved.
Which of the statements given above is/are correct?
1, 2 and 3
2 and 3 only
1 and 2 only
1 only
Q.44
Waves that are required for long distance wireless communication are
Infrared rays
Ultraviolet rays
Radio waves
Microwaves
Q.45
A television channel is characterised by
Frequency of transmitted signal
Velocity of transmitted signal
Physical dimension of television screen
Size of picture tube
Q.46
What is found in frequency modulation ?
Fixed frequency
Fixed dimension
Change in frequency and dimension
Change in dimension only
Q.47
Which of the following has the highest entropy?
Hydrogen
Diamond
Liquid nitrogen
Mercury
Q.48
Should cars have bumpers that collapse under impact?
Yes, since the offending car should get damaged and pay for the mistake
No, since it would be very expensive to get the car repaired
No, since the colliding car would then ram into the occupants and kill them
Yes, since they help to absorb the impact of a collision and keep the occupants safe
Q.49
Negative feedback in amplifiers
Increases bandwidth and decreases noise
Decreases bandwidth and decreases noise
Increases bandwidth and increases noise
Decreases bandwidth and increases noise
Q.50
According to Rutherford's atomic model, the electrons inside an atom are
Centralized
Not Stationary
Stationary
None of these
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