Semiconductor Electronic: Material, Devices And Simple Circuits — Physics STD 12 Science — Question

If velocity of a particle is 3 times of that of electron and ratio of de brogile wavelength of particle to that of electron is 1.814×10⁻⁴. The particle will be:

The permanent magnetic moment of the atoms of a material is not zero. The material:

1. Must be paramagnetic.
2. Must be diamagnetic.
3. Must be ferromagnetic.
4. May be paramagnetic.

The following truth table corresponds to the logic gate

(a) NAND

(b) OR

(c) AND

(d) XOR

With a potentiometer null point were obtained at 140 cm and 180 cm with cells of emf 1.1 V and one unknown X volts. Unknown emf is

(a) 1.1 V

(b) 1.8 V

(c) 2.4 V

(d) 1.41 V

Stars are twinkling due to

(a) Diffraction

(b) Reflection

(c) Refraction

(d) Scattering

The charge on proton is:

An electron (charge = 1.6 ) is accelerated through a potential of 100,000 V. The energy acquired by the electron is

(a) 1.6

(b) 1.6

(c) 0.53

(d) 1.6

Which one is not the correct statement

(a) 1 volt × 1 coulomb = 1 joule	(b) 1 volt × 1 ampere = 1 joule/second
(c) 1 volt × 1 watt = 1 H.P.	(d) Watt-hour can be expressed in eV

A screen is placed a distance 40cm away from an illuminated object. A converging lens is placed between the source and the screen and it is attempted to form the image of the source on the screen. If no position could be found, the focal length of the lens:

1. Must be less than 10cm.
2. Must be greater than 20cm.
3. Must not be greater than 20cm.
4. Must not be less than 10cm.

Assuming that universe is expanding, if the spectrum of light coming from a star which is going away from earth is tested, then in the wavelength of light

(a) There will be no change

(b) The spectrum will move to infrared region

(c) The spectrum will seems to shift to ultraviolet side

(d) None of the above