Q.1
The wave like properties of electrons are useful in
Q.2
Which compressor is usually used in AC?
Q.3
Which sources produce alternating current (AC)?
Q.4
Matter waves are
Q.5
An ice block with a piece of lead embeded in it floats in water. If ice melts the water level
Q.6
The rate of change of linear momentum of a body falling freely under gravity is equal to it's ________ ?
Q.7
According to the theory of relativity, which of the following always remains constant ?
Q.8
Positive feedback is used in
Q.9
Which of these branches of Physics deal with heat and temperature and their relation to energy and work?
Q.10
When the speed of car is doubled, then what will be the braking force of the car to stop it in the same distance ?
Q.11
Electrons carry a
Q.12
What is a neuron ?
Q.13
Who indirectly determined the mass of the electron by measuring the charge of the electron?
Q.14
The best material for the core of a transformer is
Q.15
Alternating current is converted into direct current by a
Q.16
________ states that internal energy is a function of state and the increase in internal energy is equal to the sum of the heat supplied to system and work done by the system.
Q.17
Two waves, each of amplitude 1.5 mm and frequency 10 Hz, are travelling in opposite direction with a speed of 20 mm/s. The distance in mm between adjacent nodes is :
Q.18
Intensity of any wave is proportional to which of the following?
Q.19
When a stone is thrown in the calm water of a pond the waves produced on the surface of water in the pond are
Q.20
Which of the following is not a transverse wave?
Q.21
The characteristic invalid for heat radiation is that it travels :
Q.22
An atom with more neutrons than protons is called
Q.23
Which electromagnetic radiation is used for satellite communication ?
Q.24
When an atom loses an electron it becomes
Q.25
A transformer works on the principle of
Q.26
Transformer is a device to convert
Q.27
Speed regulation of synchronous motor is
Q.28
A parallel-plate capacitor,with air in between the plates, has capacitance C. Now the space between the two plates of the capacitor is filled with a dielectric of dielectric constant 7. Then the value of the capacitance will become
Q.29
Which phase change is an example of an exothermic process?
Q.30
The velocity of heat radiation in vacuum is
Q.31
If density of oxygen is 16 times that of hydrogen, what will be their corresponding ratio of velocity of sound?
Q.32
Which one of the following statements with regard to Jet stream, an upper level tropospheric wave, is not correct?
Q.33
When a light wave is reflected from a mirror, there is a change in its
Q.34
A doppler effect occurs when a source of sound moves
Q.35
What is the name of the device used to convert alternating current into direct current ?
Q.36
A Step-Up transformer increases
Q.37
A transformer
Q.38
What part of the atom has a positive charge?
Q.39
Who was the first scientist to discover Electrons?
Q.40
What is the size of Electron as comapared to Proton and Neutron?
Q.41
The force that binds the neutrons and protons in a nucleus is called as:
Q.42
Refrigeration is a process which
Q.43
Blowing Air with open pipe is an example of :
Q.44
Conservation of energy refers to the fact that
Q.45
Which of the following causes adiabatic temperature changes in atmosphere?
Q.46
The wavelength at which the peak of intensity of blackbody radiation occurs
Q.47
Which of the following principle is used to produce ''low-temperatures' ?
Q.48
The three famous law of Kepler is related to
Q.49
Atomic hydrogen has a life period of
Q.50
The Law of Kepler is related with which among the following ?
0 h : 0 m : 1 s