List of practice Questions

The process of superimposing message signal with career wave is known as:
For a generalised communication system, arrange the following in the correct sequence:
(A) Receiver
(B) Information source
(C) channel
(D) User of information
(E) Transmitter
A boy of height 1 m stands in front of a convex mirror. His distance from the mirror is equal to the focal length of the mirror, the height of the image is:
In young's double slit experiment, the separation between slits is halved and distance between this sleets and screen is doubled.The Fringe width will be :
Which of the following graph correctly represents the variation of resistivity ‘s’ the temperature ‘T’ for a semiconductor material? 
An α particle and a proton are accelerated from rest through the same potential difference. The ratio of linear momenta acquired by above two particles will be:
A potentiometer with a cell of 2.4 volts and internal resistance of 2 Ω maintains potential drop across the resistance wire AB of length 2 m and resistance 10 Ω. A standard cell that maintains a constant EMF of ‘V’ volt with an internal resistance of 0.2 gives a balance point at 1.6 M length of the wire. The value of EMF of the second (standard) cell(V) is:
If a light Re travels from denser to rear medium which of the following statements are correct ?
(A)energy increases
(B)frequency remain same
(C)phase changes by 90°
(D) velocity increases
(E)Wavelength decreases
Choose the correct answer from the options given below:
The radius of curvature of the curved surface of a plano convex lens is 20 CM. if the refractive index of the material of the lens be 1.5, then the focal length of the lens will be :
The power dissipated as hit in the closed circuit is :
The induced EMF produced in the moving rod if the magnetic field becomes parallel to the rails instead of becoming perpendicular will be :
Find the value of current in the circuit.
The drift velocity of the electron is directly proportional to the:
An electron is projected in a uniform magnetic field along the direction of the field, the electron will experience:
An electron, an ɑ particle, a Proton and a deuteron have the same kinetic energy. which of these particles has the shortest de Broglie wavelength?
The shortest Wave length in the lyman series of hydrogen spectrum is 912 Å. The shortest wavelength present in paschen series of spectral lines will be
Read following statements concerning electronic devices
(A)A transistor is used as rectifier
(B)A zener diode is used as a voltage regulator
(C)A not gate is a Universal Gate
(D)A transistor is used as an amplifier
(E)A photodiode is used as an oscillator
Choose the correct answer from the options given below:
In Young’s double slit experiment, an interference pattern is obtained on the screen.If one of the slits is closed, then :
In Young’s double slit experiment the Fringe width is 0.4 mm. if the whole apparatus is immeresed in water of refractive index 4 / 3 without changing its geometry the new Fringe width will be :
The variation of electric field with respect to the distance from center of charged conducting spherical shell of radius R is given by : 
An infinitely long wire is charged uniformly with a charge density λ and placed in the air, the electric field at a distance r from the wire will be:
A proton and an Alpha particle moving with the same kinetic energy enter the range of a uniform magnetic field perpendicular to it. the ratio radii of their trajectors will be
Which of the following rays used in doing LASIK (Laser-assisted in Situ peratomileusis eye surgery)?
The ratio of radii of two nuclei having atomic mass numbers 27 and 8 respectively, will be:
If N0 is the original mass of the substance of half-life t 1/2 = 4 years then the amount of substance left after 12 years is :