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Quiz 24
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Q.1
At hill stations, the boiling point of water will be
Same as at sea level
Less than that at sea level
More than that at sea level
Equal to the melting point of ice
Q.2
RADAR is used for:
locating submerged submarines.
receiving a signals in a radio receiver.
locating geostationary satellites.
detecting and locating the position of objects such as Aeroplanes.
Q.3
Of the following properties of a wave, the one that is independent of the other is its
amplitude
velocity
wavelength
frequency
Q.4
Out of the following, which is not emitted by radioactive substance?
Electrons
Electromagnetic radiations
Alpha particles
Neutrons
Q.5
Rate of doing work is called
Capacity
Energy
Power
Current
Q.6
Water boils at a lower temperature on the hills because
It is cold on the hills
There is less carbon dioxide on the hills
There is a decrease in air pressure on the hills
There is less oxygen
Q.7
The force exerted by a magnet is an example of ________
Non-contact force
Muscular force
Contact force
Electrostatic force
Q.8
The force exerted on an object is 200 N and its mass is 100 kg. Find the acceleration of the object.
2 m/s
2 m
2 m/sq.s
2 s
Q.9
The spokes used in the wheel of a bicycle increase its
Moment of inertia
Velocity
Acceleration
Momentum
Q.10
Instrument used to measure the force and velocity of the wind is
Ammeter
Anemometer
Altimeter
Audiometer
Q.11
When pressure is increased the melting point of ice
Increases
Does not change
Decreases
Depends on the impurities in the ice
Q.12
In which form is the supplied heat energy stored during change in temperature of substance?
Heat energy
Kinetic energy
Potential energy
Both kinetic and potential energy
Q.13
What is another name for energy of motion?
Motional energy
Potential energy
Kinetic energy
Rotational energy
Q.14
The energy associated with motion is called
Potential energy
Kinetic energy
Both A & B
None of the above
Q.15
The boiling point of water decreases at higher altitudes is due to
Low temperature
Low atmospheric pressure
High temprature
High atmospheric pressure
Q.16
A man standing close to the platform at a railway station experiences a pulling force towards a fast moving train because of ________ .
Gravitational force between train and man
Illusion of the man
The centripetal force
Pressure difference due to fast moving air in between
Q.17
It is difficult to cook rice
At the top of a mountain
At the sea level
Under a mine
Same anywhere
Q.18
Which tube used to produce X-ray?
Coolidge tube
X-ray tube
Roentgen
None of these
Q.19
The wall of a dam is made thicker at the bottom than at the top because the pressure exerted by the water on the wall
Depends on the thickness of the wall
Increases with height of the wall
Increases with depth of the wall
Depends on the area of the wall
Q.20
The rate at which energy is transferred is called
Power
Watt
Volt
Potential
Q.21
An object with a mass of 22 kg moving with a velocity of 5 m/s possesses a kinetic energy of :
275 J
110 J
2750 J
110 J
Q.22
Pure water is bad conductor of electricity because it is
Feebly ionized
Not volatile
A very good solvent
A non-polar solvent
Q.23
The metal whose electrical conductivity is more, is
Copper
Aluminium
Silver
Lead
Q.24
Fuse wire is made of an alloy of
Tin and Lead
Tin and Copper
Lead and Copper
Copper and Silver
Q.25
In the electrical circuit of a house, the fuse acts as
A load
A thermopile
A safety device
A step down device
Q.26
Lightning is produced when
Similar charges of electricity rush towards each other and then get repelled
Clouds strike against impurities in air and the friction burns up these impurities
Strong opposite charges in different clouds break down the resistance offered by the intervening air
Water vapour produces electricity in the clouds
Q.27
The metal used to make lightning conductors is
Iron
Aluminium
Copper
Zinc
Q.28
At boiling point of liquids, its
Temperature increases
Atmospheric pressure increases
Temperature remains constant
Vapour pressure decreases
Q.29
Contact force is another name for ________
Friction
Magnetic force
Electrostatic force
Muscular force
Q.30
The best conductor of electricity among the following is :
Copper
Iron
Aluminium
Silver
Q.31
Kilowatt-hour is the unit of :
Energy
Power
Force
Momentum
Q.32
What is the value of 1 kW = ?
1000 W
10 W
100 W
10000 W
Q.33
The electric current in a metal wire is due to the flow of -
Electrons
Protons
Ions
Holes
Q.34
In which of the following processes is energy released ?
Respiration
Photosynthesis
Ingestion
Absorption
Q.35
Which of the following is a conductor of electricity ?
Rubber
Pure water
Salt water
Benzene
Q.36
A bird sitting on a high tension electric wire does not get electrocuted because
It has high resistance
The body is earthed
It does not form a closed path for the flow of current
Its feet are good insulators
Q.37
The nature of fuse wire is
High resistance and low melting point.
High resistance and high melting point.
Low resistance and high melting point.
Low resistance and low melting point.
Q.38
Which of these is exhibiting kinetic energy?
An archer with a flexed bow
A person sitting on a couch while watching TV
A space station orbiting Earth
All of the above
Q.39
Good conductor of electricity is
Dry air
Paper
Kerosene
Graphite
Q.40
One Kilowatt hour is equal to -
3.6 Mega Joule
3.8 Mega Joule
3.2 Mega Joule
4.0 Mega Joule
Q.41
Materials that usually are good conductors of electricity?
Aluminium
Lead
Nickel
Wood
Q.42
Copper wires are generally used for electrical power transmission instead of iron wire because :
Copper is cheaper than iron
Copper is lighter than iron
Copper is a better conductor of electricity than iron
Copper can take higher power than iron
Q.43
The earth-wire of a cable is connected to
The outer metallic body of the appliance
The fuse of the appliance
The filament of the appliance
Short circuitry of the appliance
Q.44
An electric fuse is based on
The chemical effect of the current
The magnetic effect of the current
The heating effect of the current
All of the above
Q.45
Metals are good conductors of electricity because
The atoms are lightly packed
They contain free electrons
They have high melting point
All the above
Q.46
A Fuse wire is characterised by
High resistance and low melting point
High resistance and high melting point
Low resistance and high melting point
Low resistance and low melting point
Q.47
The fuse in an electric circuit is connected in
Series with neutral
Parallel to live
Parallel to neutral
Series with live
Q.48
Working of safety fuses depends upon
1. magnetic effect of the current
2. chemical effect of the current
3. magnitude of the current
4. heating effect of the current
Select the correct answer using the code given below.
1, 2, 3 and 4
1, 2 and 3 only
3 and 4 only
4 only
Q.49
It is easier to roll a barrel full of coal tar than to pull it because
the full weight of the barrel comes into play when it is pulled
the rolling friction is much less than the sliding friction
more surface area of the barrel is in contact with the road when it is pulled
coal tar is a liquid and it flows in the barrel when it is rolled
Q.50
Minimum number of unequal vectors which can give zero resultant are
two
three
four
more than four
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