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Quiz 19
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Q.1
The amount of matter in a ball of steel is its :
Weight
Mass
Density
Volume
Q.2
Which of the following laws validates the statement that matter can neither be created nor destroyed ?
Law of conservation of energy
Le Chatelier's Principle
Law of conservation of mass
Law of osmosis
Q.3
The boiling point of liquids vary as
Pressure varies
Temperature varies
Volume varies
Density varies
Q.4
Light from Sun reaches Earth in approximately
3 minutes
8 minutes
10 minutes
12 minutes
Q.5
It is dangerous to observe Solar eclipse with naked eyes because
Infrared radiations from sun burn our retina
Ultraviolet radiations from Sun burn our retina
All radiations from sun initiate chemical reactions in eyes
Cosmic rays reach eyes more during the eclipse
Q.6
Formation of shadows can be explained by
Rectilinear propagation of light
Reflection
Refraction
Total internal reflection
Q.7
Which of the following is arranged in order of decreasing conductivity?
Copper, Aluminium, Steel, Silver
Aluminium, Silver, Copper, Steel
Copper, Silver, Aluminium, Steel
Silver, Copper, Aluminium, Steel
Q.8
Every hot object emits ________
X–rays
Visible light
Infrared rays
Ultraviolet rays
Q.9
The freezing point of fresh water is ________ .
4°C
3°C
5°C
0°C
Q.10
Through which light cannot pass?
Notebook paper
Water
Book
Sun glasses
Q.11
The speed of light in air is
3 × 10
8
m/s
3 × 10
–8
m/s
8 × 10
3
m/s
Infinity
Q.12
Eclipses occur due to which optical phenomena?
Reflection
Refraction
Rectilinear propagation
Diffraction
Q.13
During hot weather, the fan produces a feeling of comfort. This is because
Fan supplies cool air
Fan cools the air
Our perspiration eva-porates rapidly
Conductivity of air increases
Q.14
The flow of thermal energy is called
Heat
Current
Voltage
Potential
Q.15
Which is an example of Phototropism?
Roots of a plant following water
Plant bending toward the light
Roots growing into the soil
A venus flytrap capturing a fly
Q.16
Light travels fastest in
Air
Water
Glass
Diamond
Q.17
The locomotion of insects to the source of light is called :
Phototropic
Hydrotropic
Phototactic
Thermotactic
Q.18
Which metal is the best conductor of heat?
Silver
Gold
Copper
All of the above
Q.19
When hot liquid is poured into a thick glass tumbler, it cracks because glass :
Is a bad conductor of heat so only inner surface expands
Has high temperature coefficient of expansion
Has a very low specific heat
Has low temperature coefficient of expansion
Q.20
Vehicle tyres are inflated properly
To ensure smooth running.
To allow the vehicle to take more load.
To avoid skidding and to minimise friction
To go fast and save fuel.
Q.21
Friction is caused by the ________ on the two surfaces in contact.
Irregularities
Smoothness
Densities
Gaps
Q.22
When a bottle of scent is kept open in a corner of a room its odour is felt in all parts of the room. This is due to the phenomenon of :
Evaporation
Vaporisation
Diffusion
Sublimation
Q.23
On a cold day when the room temperature is 15°C, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15°C, because :
Metals have higher thermal capacity than plastics
Plastics have a lower density than metals
Metals are good conductors of heat
Plastics have a higher thermal conductivity than metals
Q.24
Which of the following is an insulator?
Mercury
Carbon
Germanium
Glass
Q.25
In a railway track, two rails are joined end to end with a gap in between them because
Steel can be saved
Accidents due to contraction in winter can be avoided
Air-gaps are necessary for bearing the weight of running train
Accidents due to expansion in summer can be avoided
Q.26
Air coolers are more suitable for
Hot and humid climate
Hot and dry climate
Cool and humid climate
Cool and dry climate
Q.27
Light travels slowest in
Glass
Water
Air
Vacuum
Q.28
Light from the sun reaches us in nearly
5 min
4.30 hrs
8 min
5.30 hrs
Q.29
Mud houses are cooler in summers and warmer in winters as compared to brick houses because
Mud is a good conductor
Mud is a bad conductor
Mud is a poor insulator
Evaporation of water causes cooling in summers and sunlight coming through holes causes warming in winters
Q.30
Ball bearings are used in cycles, scooters etc to
Increase the friction between the wheel and the axle
Reduce the friction between the wheel and the axle
Reduce the friction between ground and the whee
None of the above
Q.31
The force of friction between two surfaces will increase if:
A layer of lubricant is kept between the two surfaces
The two surfaces are pressed harder
Air gap is created between the two surfaces
Irregularities on both the surfaces are removed
Q.32
'Therm' is the unit of
Power
Heat
Light
Distance
Q.33
We feel cool when we sit near the fan, this is because
Fan gives cool air.
Fan cools surrounding air.
Air vapourises the sweat on our body.
We feel cool when air touches the body.
Q.34
When hot-water is sprinkled on a hotter glass tumbler, it breaks because
Glass suddenly expands
Glass suddenly contracts
Water evaporates
Glass reacts chemically with water
Q.35
An image formed by a plane mirror, that cannot be obtained on a screen is called ________
Virtual image
Real image
Inverted image
Erect image
Q.36
Heat flows as a result of difference of ________
Temperature
Density
Mass
Volume
Q.37
Friction can be reduced by changing from
Static to Dynamic
Rolling to Sliding
Dynamic to Static
Sliding to Rolling
Q.38
Rolling friction is caused by ________
Non-elastic effects
Gravity
Power dissipation
Buoyancy
Q.39
The boiling point of water depends upon the
Atmospheric pressure
Volume
Density
Mass
Q.40
One bar is equal to
10
3
Pa
10
6
Pa
10
5
Pa
10
4
Pa
Q.41
A gap is left between two rails of a railway track to accommodate...... of the metal.
Areal expansion
Volume expansion
Linear expansion
Apparent expansion
Q.42
Light beam which is highly directional is called:
Eraser
Grazer
Maser
Laser
Q.43
Speed of light is maximum in ________
Vacuum
Solids
Liquids
Gases
Q.44
Light travels in a straight line (rectilinear propagation of light). This statement does hold if the medium of travel for light is
Of variable refractive index
Made up of slabs of different refractive indices
Homogeneous and transparent
Inhomogeneous and transparent
Q.45
It is more difficult to walk on ice than on a concrete road because
There is very little friction between the ice and feet pressing it
Ice is soft when compared to concrete
There is more friction between the ice and feer
None of these
Q.46
A ball rolling along the ground gradually slows down and finally comes to rest is due to ________
Friction
Magnetic force
Electrostatic force
Muscular force
Q.47
Frictional force acts in
The same direction as the motion
The opposite direction of the motion
All the directions
Upward direction
Q.48
Pressure Cooker cooks faster because
Boiling point decreases with rise of pressure
It cooks the food at low pressure
Higher temperature is attained for cooking
The material of the cooker is a good conductor
Q.49
Sound waves cannot travel in
Vacuum
Water
Glass
Hydrogen gas
Q.50
In a particular system, the units of length, mass and time are chosen to be 10 cm, 10 g and 0.1 s respectively. The unit of force in this system will be equivalent to
0.1 N
1 N
10 N
100 N
0 h : 0 m : 1 s
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