A galvanometer has a resistance of 4 Ω and a full scale deflection is produced by 12 mA current. What resistance must be connected in series with it to enable it to read 1.2 V ?
45 Ω
96 Ω
80 Ω
40 Ω
A beam of monochromatic light is incident on one face of an equilateral prism. The angle of incidence is 55°. If the angle of emergence is 46°, then the angle of minimum deviation will be
> 41°
< 41°
= 41°
≥ 41°
Mark the wrong statement regarding polarisation of light
The vibrations in a plane polarised light are perpendicular to the plane of polarisation
If a polarised light of intensity l0 , is passed through an analyser the intensity of light transmitted is I = l0 cos2 θ
Polarisation is the property of longitudinal wave
Tangent of polarising angle is equal to the refractive index of medium upon which the light is incident
The wavelength of first Lyman series in the transition from n = 2 to n = 1 is
110 nm
120 nm
122 nm
125 nm
When a radioactive isotope decay in series by the emission of 3 -particles and a β -particle, the isotope finally formed is
λ1, λ2, λ3 are de-Broglie wavelengths of electron, proton and - particle. If they are accelerated by same potential, then
λ1 < λ2 < λ3
λ1 >λ2 > λ3
λ1 < λ2 > λ3
λ1 > λ2 < λ3
A transistor is connected in CE configuration. The supply to the collector is 8 V and the voltage drop across a resistor of 400 Ω in the collector circuit is 0.5 V. If the current gain factor is = 0.96 then, the base current will be nearly
52 µA
42 µA
32 µA
26 µA
The width of depletion layer in a p-n junction diode
increases when a forward bias is applied
increases when a reverse bias is applied
decreases when a reverse bias is applied
remains same irrespective of bias voltage
Which of the following truth table is of NAND gate ?
B.
NAND gate is the inversion of AND gate
i.e. AND + NOT = NAND
So, the truth table for NAND gate is