Download App

Electron, Photon, Photoelectric Effect and X-Rays — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsElectron, Photon, Photoelectric Effect and X-Rays1 Mark
Question

Assertion :   The specific charge for positive rays is a characteristic constant.

Reason     : The specific charge depends on charge and mass of positive ions present in positive rays.

(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

(b) If both assertion and reason are true but reason is not 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 Electron, Photon, Photoelectric Effect and X-Rays→Electron, Photon, Photoelectric Effect and X-Rays — all question types→Physics STD 12 Science question papers→Gujarat Board STD 12 Science question papers→Gujarat Board question paper generator→

Similar questions

A dielectric slab is inserted between the plates of an isolated capacitor. The force between the plates will:
  1. Increase.
  2. Decrease.
  3. Remain unchanged.
  4. Become zero.
→

The voltage V and current I graph for a conductor at two different temperatures  and   are shown in the figure. The relation between   and  is

(a)  

(b)  

(c) 

(d)  
→

Assertion  :   The earth’s magnetic field is due to iron present in its core.

Reason      : At a high temperature magnet losses its magnetic property or magnetism.

(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 assertion is false but reason is true.
→

A nucleus is bombarded with a high speed neutron so that resulting nucleus is a radioactive one. This phenomenon is called

(a) Artificial radioactivity

 (b) Fusion

 (c) Fission

 (d) Radioactivity
→
If an object is positively charged, theoretically the mass of the object ______?
→

Ohm's law is true

(a) For metallic conductors at low temperature

(b) For metallic conductors at high temperature

(c) For electrolytes when current passes through them

(d) For diode when current flows
→
In alternating current.
→
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:
→
Two coils X and Y are linked such that emf E is induced in Y when the current in X is changing at the rate $\text{I}\big(=\frac{\text{dI}}{\text{dt}}\big)$. If a current I0​ is now made to flow through Y, the flux linked with X will be.
→

The magnitude of electric field intensity E is such that, an electron placed in it would experience an electrical force equal to its weight is given by

(a) mge

(b)  

(c)  

(d)  
→