Download App

Electronics — Physics STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 SciencePhysicsElectronics1 Mark
Question

For a crystal system, a = b = c, a = b = g  ¹ 90o, the system is

(a) Tetragonal system

(b) Cubic system

(c) Orthorhombic system

(d) Rhombohedral system
✓

Answer

(d) Rhombohedral system

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "M.C.Q [1M]" from Electronics→Electronics — all question types→Physics STD 12 Science question papers→Bihar Board STD 12 Science question papers→Bihar Board question paper generator→

Similar questions

An electron and a proton enter a magnetic field perpendicularly. Both have same kinetic energy. Which of the following is true

(a) Trajectory of electron is less curved

(b) Trajectory of proton is less curved

(c) Both trajectories are equally curved

(d) Both move on straight-line path
→

In the circuit diagram shown in the adjoining figure, the resultant capacitance between P and Q is

(a) 47 μF 

(b) 3 μF

(c) 60 μF

(d) 10 μ F
→
If two soap bubbles of different radii are connected by a tube:
  1. Air flows from bigger bubble to the smaller bubble till the sizes become equal.
  2. Air flows from bigger bubble to the smaller bubble till the sizes are interchanged.
  3. Air flows from the smaller bubble to the bigger.
  4. There lis no flow of air.
→

If a magnetic substance is kept in a magnetic field, then which of the following is thrown out

(a) Paramagnetic

(b) Ferromagnetic

(c) Diamagnetic

(d) Antiferromagnetic
→
A coil has 100 turns. When a current of 5A produces a magnetic flux of $1\mu\text{Wb}$, the coefficient of self induction is :
→
50% of the X-ray coming from a Coolidge tube is able to pass through a 0.1mm thick aluminium foil. The potential difference between the target and the filament is increased. The thickness of the aluminium foil that will allow 50% of the X-ray to pass through will be:
  1. zero
  2. < 0.1mm
  3. 0.1mm
  4. > 0.1mm
→
. A surface that has the same electrostatic potential at every point on it is known as _____________.
→
A conducting gas is in the form of a long cylinder. Current flows through the gas along the length of the cylinder. The current is distributed uniformly across the cross-section of the gas. Disregard thermal and electrostatic forces among the gas molecules. Due to the magnetic fields set up inside the gas and the forces which they exert on the moving ions, the gas will tend to:
→
A conducting square loop of side l and resistance R moves in its plane with a uniform velocity u perpendicular to one of its sides. A uniform and constant magnetic field B exists along the perpendicular to the plane of the loop as shown in figure. The current induced in the loop is:
  1. $\frac{\text{Blv}}{\text{R}}$ clockwise.
  2. $\frac{\text{Blv}}{\text{R}}$ anticlockwise.
  3. $\frac{2\text{Blv}}{\text{R}}$ anticlockwise.
  4. $\text{Zero.}$

→

If ne and vd be the number of electrons and drift velocity in a semiconductor. When the temperature is increased

(a) ne increases and vd decreases

(b) ne decreases and vd increases
(c) Both ne and vd increases

 (d) Both ne and vd decreases
→