Q.1
At hill stations, the boiling point of water will be
Q.2
RADAR is used for:
Q.3
Of the following properties of a wave, the one that is independent of the other is its
Q.4
Out of the following, which is not emitted by radioactive substance?
Q.5
Rate of doing work is called
Q.6
Water boils at a lower temperature on the hills because
Q.7
The force exerted by a magnet is an example of ________
Q.8
The force exerted on an object is 200 N and its mass is 100 kg. Find the acceleration of the object.
Q.9
The spokes used in the wheel of a bicycle increase its
Q.10
Instrument used to measure the force and velocity of the wind is
Q.11
When pressure is increased the melting point of ice
Q.12
In which form is the supplied heat energy stored during change in temperature of substance?
Q.13
What is another name for energy of motion?
Q.14
The energy associated with motion is called
Q.15
The boiling point of water decreases at higher altitudes is due to
Q.16
A man standing close to the platform at a railway station experiences a pulling force towards a fast moving train because of ________ .
Q.17
It is difficult to cook rice
Q.18
Which tube used to produce X-ray?
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
Q.20
The rate at which energy is transferred is called
Q.21
An object with a mass of 22 kg moving with a velocity of 5 m/s possesses a kinetic energy of :
Q.22
Pure water is bad conductor of electricity because it is
Q.23
The metal whose electrical conductivity is more, is
Q.24
Fuse wire is made of an alloy of
Q.25
In the electrical circuit of a house, the fuse acts as
Q.26
Lightning is produced when
Q.27
The metal used to make lightning conductors is
Q.28
At boiling point of liquids, its
Q.29
Contact force is another name for ________
Q.30
The best conductor of electricity among the following is :
Q.31
Kilowatt-hour is the unit of :
Q.32
What is the value of 1 kW = ?
Q.33
The electric current in a metal wire is due to the flow of -
Q.34
In which of the following processes is energy released ?
Q.35
Which of the following is a conductor of electricity ?
Q.36
A bird sitting on a high tension electric wire does not get electrocuted because
Q.37
The nature of fuse wire is
Q.38
Which of these is exhibiting kinetic energy?
Q.39
Good conductor of electricity is
Q.40
One Kilowatt hour is equal to -
Q.41
Materials that usually are good conductors of electricity?
Q.42
Copper wires are generally used for electrical power transmission instead of iron wire because :
Q.43
The earth-wire of a cable is connected to
Q.44
An electric fuse is based on
Q.45
Metals are good conductors of electricity because
Q.46
A Fuse wire is characterised by
Q.47
The fuse in an electric circuit is connected in
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.
Q.49
It is easier to roll a barrel full of coal tar than to pull it because
Q.50
Minimum number of unequal vectors which can give zero resultant are
0 h : 0 m : 1 s