A crystal diode is a
|
(a) Non-linear device |
(b) Amplifying device |
(c) Linear device |
(d) Fluctuating device |
A crystal diode is a
|
(a) Non-linear device |
(b) Amplifying device |
(c) Linear device |
(d) Fluctuating device |
(a) Non-linear device
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A radioactive sample at any instant has its disintegration rate 5000 disintegration per minute. After 5 minutes, the rate is 1250 disintegrations per minute. Then, the decay constant (per minute) is
|
(a) 0.8 In 2 |
(b) 0.4 In 2 |
(c) 0.2 In 2 |
(d) 0.1 In 2 |
The photoelectric threshold wavelength of a certain metal is 3000Å. If the radiation of 2000Å is incident on the metal
|
(a) Electrons will be emitted |
(b) Positrons will be emitted |
|
(c) Protons will be emitted |
(d) Electrons will not be emitted |
A thin oil layer floats on water. A ray of light making an angle of incidence of 40° shines on oil layer. The angle of refraction of light ray in water is (
)
|
(a) 36 .1° |
(b) 44.5° |
(c) 26. 8° |
(d) 28.9° |
The material of fuse wire should have
|
(a) A high specific resistance and high melting point |
|
(b) A low specific resistance and low melting point |
|
(c) A high specific resistance and low melting point |
|
(d) A low specific resistance and a high melting point |
An electric motor operates on a 50 volt supply and a current of 12A. If the efficiency of the motor is 30%, what is the resistance of the winding of the motor
|
(a) 6 Ω |
(b) 4 Ω |
(c) 2.9 Ω |
(d) 3.1 Ω |
The torque acting on a dipole of moment
in an electric field
is
|
(a) |
(b) |
(c) Zero |
(d) |