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Quiz 7
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Q.1
If there is a circular hole in a metal plate, what happens to the radius of the hole when the plate is heated?
Increases
Decreases
Unchanged
Depends upon the metal
Q.2
For accurate scientific work, temperatures are often measured by
Mercury thermometers
Alcohol thermometers
Platinum resistance thermometers
Thermoelectric thermometers
Q.3
In heating frozen foods in sealed pouches in a microwaves, why do you first poke holes in the pouch?
To prevent the steam pressure from bursting open the pouch
To allow the heat to get into the food through the hole
To allow the microwaves to get into the food through the holes
To allow the aroma of the food to come out through the holes
Q.4
The ''Greenhouse effect' is mainly due to increase in atmospheric
Ozone
Nitrogen
Sulphur dioxide
Carbon dioxide
Q.5
Thermohaline circulation is mainly due to
Cold, dense ocean water sinking and warmer water replacing it
Winds causing circulation of ocean water
Warmer, less dense water sinking in the ocean and cold water replacing it
Warm water being added to the ocean due to industial waste
Q.6
Blotting paper absorbs ink due to
Capillary action phenomenon
Diffusion of ink through the blotting
Siphon action
Viscosity of ink
Q.7
Name the process by which bubbles from liquid are formed?
Effervescence
Surface Tension
Surface Energy
Degasification
Q.8
Shock-absorbers are usually made of steel as it :
Is not brittle
Has lower elasticity
Has higher elasticity
Has no ductile property
Q.9
Relative humidity is expressed as
Grams
Kilograms
Percentage
Ratio
Q.10
The humidity of the air depends upon
Weather
Temperature
Location
All of the above
Q.11
Super cooling stands for cooling of a liquid :
At freezing point
Below freezing point
At melting point
Above melting point
Q.12
The spring constant of a spring depends on its
Length only
Material only
Length and its diameter
Thickness, its diameter and its material
Q.13
Which of the following device is best suited for measuring the temperature inside metallurgical furnaces?
Pyrometer
Thermocouple
Thermometer
Thermistor
Q.14
When two ice cubes are pressed together, they join to form one cube. Which one of the following helps to hold them together?
Hydrogen bond formation
Vander waals forces
Covalent attraction
Dipole interaction
Q.15
Which of the following is an example of simple harmonic motion?
Earth spinning on its axis
Simple pendulum motion
Ball bouncing on floor
Motion of a ceiling fan
Q.16
Boyle's law is a relationship between
Pressure and volume
Volume and temperature
Volume and density
Pressure and temperature
Q.17
Which of the following device is used to measure humidity?
Hydrometer
Hygrometer
Psycho Meter
Anemometer
Q.18
Which set of conditions represents the easiest way to liquify a gas ?
Low temperature and high pressure
High temperature and low pressure
Low temperature and low pressure
High temperature and high pressure
Q.19
The dimensional formula ML
–1
T
–2
corresponds to
Modulus of elasticity
Viscosity
Moment of a force
Thrust
Q.20
Amount of water vapour (gaseous) in a given volume of air (cubic metre) is known as:
Mixing ratio
Relative humidity
Absolute humidity
Specific humidity
Q.21
According to special theory of relativity the mass of a particle
Increases with increase in velocity with respect to an observer.
Decreases with increase in velocity.
Decreases with decrease in velocity.
Is independent of its velocity.
Q.22
Bolometer is used to measure
Frequency
Temperature
Velocity
Wavelength
Q.23
In a freezer ice cubes will be formed more quickly in trays made of
Rubber
Plastic
Aluminium
Wood
Q.24
The average kinetic energy of the molecules of an ideal gas is directly proportional to
Velocity of Molecules
Mass of Molecules
Absolute temperature of the gas
Temperature of environment
Q.25
The dimensional formula for universal gravitational constant is
M
1
L
3
T
2
ML
2
T
–2
M
–2
M
–1
L
3
T
–2
Q.26
Which one of the following physical quantities has the same dimensions as that of Planck's constant?
Linear momentum
Angular momentum
Force
Potential energy
Q.27
A cycle tyre bursts suddenly. This represents an :
Isothermal process
Adiabatic process
Isochoric process
Isoboric process
Q.28
If cream is removed from milk, its density
Increases
Decreases
Remains the same
May increase or decrease
Q.29
A falling drop of rain water acquires the spherical shape due to
Viscosity
Surface Tension
Atmospheric pressure
Gravitational force
Q.30
Which of the following is not a property of heavy water ?
Boiling point of heavy water is lower than that or ordinary water
Density of heavy water is higher than that of ordinary water
Freezing point of heavy water is higher than that of ordinary water
It produces corrosion
Q.31
Two rods, one of copper and other of steel, experience the same upthrust when placed in water.Thus, both have
Equal volume
Equal weight
Equal density
Equal mass
Q.32
Which of the metals has the maximum thermal conductivity?
Iron
Aluminium
Silver
Copper
Q.33
Which law relates to the ideal gas law?
P1T1 = P2T2
P1/V1 = P2/V2
P1V1 = P2V2
T1/V1 = T2/V2
Q.34
Which of these liquids has the highest viscosity?
Milk
Syrup
Pineapple juice
Water
Q.35
Boyle's law relates to
Kinetic Theory of Gases
Viscosity of Liquids
Elasticity of Solids
Plasticity of Solids
Q.36
Steel is more elastic than rubber because it :
Requires larger deforming force
Is never deformed
Is deformed very easily
Is harder than rubber
Q.37
Period of oscillation of 3 cm microwaves in seconds is
1 × 10
10
1 × 10
–10
0.01
0.001
Q.38
When a person sitting on a swing stands up on the swing, the frequency of oscillation
Decreases
Increases
Becomes infinite
Does not change
Q.39
Which has the lowest albedo?
Dark surfaces
Light surfaces
Both A & B
None of the above
Q.40
Why the needle of iron swims on water surface when it is kept gently ?
It will remain under the water, when it will displace more water than its weight
The density of needle is less than that of water
Due to surface tension
Due to its shape
Q.41
Rise of oil a wick is due to
Density of the oil
Viscosity of the oil
Surface tension of the oil
Pressure of the oil
Q.42
If ice floating on water in a vessel melts, the water level in the vessel ________ .
Increases
Does not change
First increases before decreasing
Decreases
Q.43
On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because
Mercury is a metal
Density of mercury is greater than that of water
Cohesion of mercury is greater than its adhesion with glass
Cohesion of water is greater than its adhesion with glass
Q.44
A solid ball of metal has a spherical cavity inside it. When the ball is heated the volume of the cavity will
Increase
Decrease
Remain unaffected
Have its shape changed
Q.45
The absorption of ink by blotting paper involves
Viscosity of ink
Diffusion of ink through the blotting
Capillary action phenomenon
Siphon action
Q.46
Water from soil enters into the root hairs owing to :
Atmospheric pressure
Capillary pressure
Root pressure
Osmotic pressure
Q.47
If the diameter of a capillary is doubled, then the rise of water in it will be
Two times
Half
Four times
No change
Q.48
A system exhibiting S.H.M. must possess
Elasticity as well as inertia
Elasticity, inertia and an external force
Elasticity only
Inertia only
Q.49
Which one of the following is a non-dimensional quantity?
Gas constant
Strain
Co-efficient of viscocity
Plank's constant
Q.50
The dimension of Planck constant equals to that of
Energy
Momentum
Angular momentum
Power
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