Q.1
Electromagnet is constructed with which of the following ?
Q.2
When number of turns in a coil is trippled, without any change in the length of coil, its self inductance becomes?
Q.3
Tungsten is used for the manufacture of the filament of an electric bulb, because
Q.4
In a filament type light bulb most of the electric power consumed appears as
Q.5
The coil wire in the electric room heater or electric cooking heater is called ________
Q.6
The composition of electrician solder is
Q.7
Mica is used in electrical appliances such as electric iron because mica is
Q.8
While ascending a hill, the driver of the vehicle keeps the gear ratio
Q.9
Second and third class levers are differentiated by
Q.10
Full form of CFL used in place of electric bulbs is
Q.11
Two electric bulbs marked 25W – 220V and 100W – 220V are connected in series to a 440Vsupply. Which of the bulbs will fuse?
Q.12
The electrical domestic tube light gives white fluorescent light because of
Q.13
The unit for measuring electric power is the
Q.14
Fleming's right hand rule is used to find the direction of the
Q.15
A current carrying conductor is associated with
Q.16
Which of the following metals is used for the manufacture of heating elements provided in electric iron ?
Q.17
When an electric bulb breaks, there is an explosive sound. That is due to
Q.18
Which of the following represents a relation for ''heat lost = heat gained'?
Q.19
Q = mcdT refers to
Q.20
An electric iron of 750 W is used for S hours per day. Then the energy consumed in one day by the iron is:
Q.21
The purpose of choke in tube light is
Q.22
1 WH =
Q.23
The device used to change the speed of an electric fan is
Q.24
The material used in electric heater is
Q.25
Which one of the following has the highest value of specific heat?
Q.26
Water is not suitable as a calorimetric substance because it :
Q.27
In order to make an electromagnet you need a
Q.28
Flemings ''Left hand Rule" is associated with the effect of
Q.29
Steam at 100°C causes more severe burns than water at 100°C because
Q.30
No current will flow between two charged bodies if they have the same
Q.31
Electricity is transmitted over long distances
Q.32
After long periods of use, a grey spot develops on the inside of a bulb. This is because
Q.33
Water is used in car radiator because of its
Q.34
How much mechanical work must be done to completely melt 1 gram of ice at 0°C ?
Q.35
Two metallic wires made from copper have same length but the radius of wire 1 is half of that of wire 2. The resistance of wire 1 is R. If both the wires are joined together in series, the total resistance becomes
Q.36
Water pipes in hilly areas often burst on a cold frosty night, because
Q.37

Light travels at the fastest speed in

  • glass
  • water
  • hydrogen
  • vacuum
Q.38

Lux is the SI unit of

  • intensity of illumination
  • luminous efficiency
  • luminous flux
  • luminous intensity
Q.39

Supersonic plane fly with the speed

  • less than the speed of sound
  • of sound
  • greater than the speed of sound
  • of light
Q.40

Inside an aeroplane, flying at a high altitude,

  • the pressure is the same as that outside
  • normal atmospheric pressure is maintained by the use of air pumps
  • the pressure inside is less than the pressure outside
  • normal humidity and partial vacuum are maintained
Q.41

Railway tracks are banked on curves

  • necessary centrifugal force may be obtained from the horizontal component weight of the train
  • to avoid frictional force between the tracks and wheels
  • necessary centripetal force may be obtained from the horizontal component of the weight of the train
  • the train may not fly off in the opposite direction
Q.42

On a rainy day, small oil films on water show brilliant colours. This is due to

  • dispersion
  • interference
  • diffraction
  • polarization
Q.43

Mach number is used in connection with the speed of

  • sound
  • aircraft
  • spacecraft
  • ships
Q.44

Solar eclipse will take place when

  • the sun is between the moon and the earth
  • the earth is between the moon and the sun
  • the moon is between the sun and the earth
  • the moon does not lie on the line joining the sun and the earth
Q.45

Sound travels with a different speed in media. In what order does the velocity of sound increase in these media?

  • Water, iron and air
  • Iron, air and water
  • Air, water and iron
  • Iron, water and air
Q.46

Identify the vector quantity from the following

  • Heat
  • Angular momentum
  • Time
  • Work
Q.47

Metals are good conductors of electricity because

  • they contain free electrons
  • the atoms are lightly packed
  • they have high melting point
  • All of the above
Q.48

out of the following, which is not emitted by radioactive substance?

  • Electrons
  • Electromagnetic radiations
  • Alpha particles
  • Neutrons
Q.49

Light year is a unit of

  • time
  • distance
  • light
  • intensity of light
Q.50

On a cold day when a room temperature is 15oC, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15oC, because

  • metals have higher thermal capacity than plastics
  • plastics have a lower density than metals
  • metals are good conductor of heat
  • plastics have a higher thermal conductivity than metals
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