Download App

Electronics — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsElectronics1 Mark
Question

Assertion  :  Zener diode works on a principle of breakdown voltage.

Reason      : Current increases suddenly after breakdown voltage.

(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.

(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.

(c) If assertion is true but reason is false.

(d) If the assertion and reason both are false.
✓

Answer

(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.

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 (1 Marks)" from Electronics→Electronics — all question types→Physics STD 12 Science question papers→Gujarat Board STD 12 Science question papers→Gujarat Board question paper generator→

Similar questions

The momentum of the photon of wavelength 5000Å  will be

(a) 1.3  m/sec     

(b) 1.3   m/sec

(c) 4  m/sec            

(d) 4  m/sec

→
Identify the wrong statement in the following. Coulomb's law correctly describes the electric force that:
→

The refractive index of a piece of transparent quartz is the greatest for

(a) Red light

(b) Violet light

(c) Green light

(d) Yellow light
→
The fundamental frequency of a string is proportional to:
  1. Inverse of its length.
  2. The diameter.
  3. The tension.
  4. The density.
→

In a step-up transformer, the turn ratio is 1 : 2. A Leclanche cell (e.m.f. 1.5V) is connected across the primary. The voltage developed in the secondary would be

(a) 3.0 V

(b) 0.75 V

(c) 1.5 V  

(d) Zero
→

Magnetic fields at two points on the axis of a circular coil at a distance of 0.05m and 0.2m from the centre are in the ratio 8 : 1. The radius of the coil is

(a) 1.0 m 

(b) 0.1 m

(c) 0.15 m

(d) 0.2 m
→

If particles are moving with same velocity, then maximum de-Broglie wavelength will be for

(a) Neutron

(b) Proton

(c) b-particle

(d) α - particle
→

In the circuit as shown in the figure, the heat produced by 6 ohm resistance due to current flowing in it is 60 calorie per second. The heat generated across 3 ohm resistance per second will be

(a) 30 calorie

(b) 60 calorie

(c) 100 calorie

(d) 120 calorie
→

When the current change from + 2A to – 2A in 0.05 second, an e.m.f. of 8 V is induced in a coil. The coefficient of self-induction of the coil is

(a) 0.1 H

(b) 0.2 H

(c) 0.4 H  

(d) 0.8 H
→

Two short magnets of equal dipole moments M are fastened perpendicularly at their centre (figure). The magnitude of the magnetic field at a distance d from the centre on the bisector of the right angle is

(a)   

(b)

(c)

(d)  
→