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Quiz 6
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Q.1
Amount of water vapour in the atmosphere is measured in terms of
Humidity
Droplets
Smog
All of the above
Q.2
A particle dropped from the top of a tower uniformly falls on ground at a distance which is equal to the height of tower. Which of the following paths will be traversed by the particle ?
Circle
Parabolic
Great circle
Hyper–parabolic
Q.3
A particle is thrown vertically upward. When it reaches the highest point, it has
A downward acceleration
An upward acceleration
A downward velocity
A horizontal velocity
Q.4
A person does some work of 1,000 J in 2 s. His power will be ________
1000W
25W
500W
50W
Q.5
The value of coefficient of restitution in perfectly elastic collision is
0
0.5
1
2
Q.6
The motion of a body around a circular path is an example of
Uniform velocity, variable acceleration
Uniform speed, uniform velocity
Uniform speed, variable velocity
Uniform speed, variable acceleration
Q.7
What should a person on a freely rotating turn table do to decrease his (angular) speed ?
Bring his hands together
Raise his hands up
Spread his hands outwards
Sit down with raised hands
Q.8
The ''four stroke petrol engine' is based on
Carnot-cycle
Otto-cycle
Diesel-cycle
Boyle's-cycle
Q.9
When a detergent is added to pure water, its surface tension
Increases
Decreases
Remains constant
Becomes infinite
Q.10
Pieces of camphor placed on water move about rapidly. This is because of
Diffusion
Viscosity
Surface tension
Capillarity
Q.11
For which one of the following does the centre of mass lie outside the body?
A fountain pen
A cricket ball
A ring
A book
Q.12
When a pail of water is swung in a vertical circle, the water does not fall out at the top of the loop when the speed is
Below a certain minimum value irrespective of amount of water in the pail
Above a certain minimum value irrespective of amount of water in the pail
Above a certain minimum value depending on amount of water in the pail
Below a certain minimum value depending on amount of water in the pail
Q.13
When the milk is churned vigorously the cream from it is separated out due to
Centripetal force
Gravitational force
Frictional force
Centrifugal force
Q.14
Damp clothes are dried in spin dryers by the action of
Centripetal forces
Centrifugal forces
Central forces
Non central forces
Q.15
Two metallic plate of equal thickness and coefficient thermal conductivity K1 and K2 put together face to face. A common plate is constructed. What is equivalent K?
K1k2/k1+k2
2k1k2/k1+k2
K1+k2/k1k2
None
Q.16
A spring is an example of which of these
Newton's 3rd law
Hooke's law
Newton's 1st law
Conservation of mass law
Q.17
For an ideal gas, which one of the following statements does not hold true?
The speed of all gas molecules is same
The kinetic energies of all gas molecules are not same
The potential energy of the gas molecules is zero
There is no interactive force between the molecules.
Q.18
Due to temperature variation along a conductor, potential variation occurs along it. This phenomenon is known as
Thomson effect
Joule effect
Seebeck effect
Peltier effect
Q.19
Which results in an increase in power?
Doing more work in less time.
Doing less work in more time.
Doing less work in less time.
Doing more work in more time.
Q.20
A sphere rolls down on two inclined planes of different angles but same height, it does so
In the same time
With the same speed
In the same time with the same speed
In the same time with the same kinetic energy
Q.21
The spring balance works on the principle of ________ .
Boyle's Law
Hooke's Law
Bernoulli's principle
Pascal's Law
Q.22
A metal plate with a circular hole at the centre is heated. What will happen to the area of the hole ?
Increase
Dacrease
Remain constant
Will increase first and then dcrease
Q.23
What is unit of Viscosity ?
Coulomb
Newton second per square meter
Watt per meter per degree celcius
Joule per kilogram per Kelvin
Q.24
The device which converts sound energy into electrical energy is called
Amplifier
Speaker
Microphone
Transmitter
Q.25
The hair of shaving brush clings together when removed from water due to
Surface tension
Viscosity
Elasticity
Friction
Q.26
Fat can be seperated from milk in a cream seperator because of :
Cohesive Force
Gravitational Force
Centripetal Force
Centrifugal Force
Q.27
In case of uniform circular motion, the acceleration is
Variable in magnitude but constant in direction
Constant in magnitude and directed radially inwards
Variable in magnitude but tangential to the circle
Zero
Q.28
A tank filled partially with a liquid is subjected to a uniform horizontal acceleration. Which of the following is true for the surface of liquid in the tank?
The liquid surface falls down on the direction of motion and rises up on the back side of the tank
The liquid surface falls down only at the center of the tank
The surface of the liquid remains horizontal
None
Q.29
A copper disc has a hole. If the disc is heated, the size of the hole
Increases
Decreases
No change
First increases and than decreases
Q.30
Which measurement describes the pressure of a gas?
450 mm Hg
315 K
251 g/cub.cm
None of the above
Q.31
The transport phenomenon occurs only in ________ state of a gas and is ________
Non-equilibrium, irreversible
Non-equilibrium, reversible
Equilibrium, irreversible
Equilibrium, reversible
Q.32
What device converts light energy to electrical energy?
Photodiode
Photovoltaic cell
Thermocouple
Heliostats
Q.33
In a water lifting electric pump, we convert
Electrical energy into Potential energy
Kinetic energy into Electrical energy
Kinetic energy into Potential energy
Electrical energy into Kinetic energy
Q.34
If a body moves with a constant speed in a circle
No work is done on it
No force acts on it
No acceleration is produced in it
Its velocity remains constant
Q.35
Air is said to be saturated when
Its pressure is minimum
It contains the maximum content of water vapour
Its thickness is maximum
It blows over the barren land
Q.36
At constant pressure, the volume of a fixed mass of a gas is directly proportional to its absolute temperature. It is the statement of
Boyle's Law
Charle's Law
Gay-Lussac's Law
Avogadro's Law
Q.37
Supercooling is cooling of liquid ________
Below melting point
Below freezing point
At melting point
Above melting point
Q.38
A real gas can act as an ideal gas in
High pressure and low temperature
Low pressure and high temperature
High pressure and high temperature
Low pressure and low temperature
Q.39
The combined gas law relates which of the following?
Volume & Temperature
Temperature & Pressure
Volume & Pressure
Volume, Temperature & Pressure
Q.40
The primary agent of contact metamorphism is
Temperature
Pressure
Weathering
Flowing water
Q.41
Charles's law is based on
Solid
Liquid
Gas
None of the above
Q.42
The lift of an aeroplane is caused by
Law of gravitation
Theorem of continuity
Pascel's law
Bernouli's theorem
Q.43
Which of the following instrument is used to measure Soil Water Tension?
Photometer
Pyrometer
Psychrometer
Tensiometer
Q.44
The oil in the wick of lamp rises due to
Pressure difference
Pheonomenon of capillarity
Low viscosity of oil
Force of cohesion
Q.45
Which of the following devices can be used to detect radiant heat ?
Liquid thermometer
Six's maximum and minimum thermometer
Constant volume air thermometer
Thermopile
Q.46
Water will not be vapourised if
The temperature is 0°C
The humidity is 0%
The humidity is 100%
The temperature is 100°C
Q.47
Liquids and gases never show
Diamagnetic property
Paramagnetic property
Ferromagnetic property
Electromagnetic property
Q.48
A circular plate, a cube and a sphere, all made up of same material and having the same
mass, are heated to 300°C and left in a room. Which of them will have the slowest rate of cooling?
Circular plate
Cube
Sphere
All will cool at the same rate
Q.49
An ideal gas cannot be
Liquified
Solidified
Both A & B
None of the above
Q.50
The instrument that measures and records the relative humidity of air is
Hydrometer
Hygrometer
Lactometer
Barometer
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