Question 1 :
In a cathode ray tube, what is the effect on the beam of particles if it passes through the electric field?
Question 3 :
Among the following, identify one that is antiparticle of itself :<br>
Question 4 :
Which of the following statement hold true w.r.t. thomsons model atom
Question 5 :
If the K.E. of a cathode ray beam is 8KeV, then the tube should work at a Potential Difference of<br/>
Question 6 :
What is the purpose of anode in a Cathode ray tube?
Question 7 :
Which one of the following device makes use of the electrons to strike certain substances to produce fluorescence?
Question 9 :
How can the brightness of the pattern on the screen or cathode ray tube be changed ?
Question 10 :
Cathode ray tube is operating at 5 kV. Then ,what is the K.E. acquired by the electrons ?<br/>
Question 11 :
What is the purpose of filament in electron gun inside a cathode ray tube?
Question 13 :
Name a device which is commonly used to convert an electric signal into a visual signal
Question 14 :
If the pressure within a discharge tube is reduced from ${10}^{-3} mm$ to ${10}^{-4} mm$ mercury then the rays which are produced perpendicular to the cathode surface are known as
Question 16 :
State the approximate voltage V$_1$ used to heat the filament in a cathode ray tube.
Question 17 :
In a cathode ray oscillograph, the focusing of beam on the screen is achieved by
Question 18 :
According to Rutherford's  $\alpha$-scattering experiment, which of the following statement is true?<br/>
Question 19 :
The fluorescence of the glass (discharge) tube at very low pressure is characteristic of ________ .
Question 21 : <p><strong>Which of them are atomic models?</strong></p><ol><li>Thomsons plum puddling model</li><li>Rutherfords nuclear model</li><li>Bohrs model</li><li>Sommerfelds model</li></ol>
Question 23 :
In 1911, the physicist Ernest Rutherford discovered that atoms have a tiny, dense nucleus by shooting pisitively charged particular at a very thin gold foil. A key physical property which led Rutherford to use gold that it was
Question 24 :
Why is the screen of the cathode ray tube coated ? Name the material used for coating.
Question 28 :
A strong argument for particle nature of cathode rays is that they
Question 29 :
Which statement about the Rutherford model of the atomis NOT true ?
Question 31 :
Who is given credit for coming up with the "plum pudding" model of the atom?
Question 33 :
According to classical theory, the path of electron in Rutherford atom nuclei is<br/>
Question 38 :
How will you relate velocity of cathode rays to c, if ‘c' denotes the velocity of light?<br/>
Question 39 :
according to Ruther-fordis atomic model, the mass of the atom is evenly distributed throughout the atom
Question 40 :
In a vacuum diode, the space around the cathode which is filled with electrons, is called ________ .
Question 42 :
In which of the following fields cathode rays show minimum deflection ?<br/>
Question 44 :
Which one of the following properties is not found in cathode rays ?
Question 45 :
Name a device which is commonly used to convert an electric signal into a visual signal.
Question 50 :
The conditions for the discharge of electricity in a discharge tube are :
Question 51 :
When a photon stimulates the emission of another photon, the two photons have
Question 52 :
The energy emitted by a source is in the form of
Question 53 :
Electrons of mass m and charge e are accelerated through a potential difference V and strike the target. The maximum speed of these electrons is<br>
Question 56 :
In J.J. Thomson's experiment the specific charge of an electron $(e/m)$ is related to potential difference $(V)$ between the cathode and the anode as<br/>
Question 57 :
In a vacuum diode, $2 \times {10}^{19}$ electrons emitted from the cathode reach the plate of a vacuum diode in 4 seconds. Find the current and the power consumed if the potential difference between the cathode and the plate is $200  V$.
Question 58 :
In Thomson's experiment, the same H.T. supply provides potential to the anode, as also to the positive deflecting plate in the region of crossed fields. If the supply voltage is doubled, then the value of new magnetic field to keep the electron beam undeflected will be
Question 59 :
In a cathode ray tube, the screen is coated with fluorescent material.
Question 60 :
According to Thomson's model, the positively charged particles are in the negatively charged sphere like seeds in a watermelon.
Question 61 :
The p.d. at the ends of a cathode ray tube is increased to 9 times its original potential difference Then<br/>I. The velocity of cathode rays increases to .... times<br/>II. The energy of cathode rays increases to.... times<br/>
Question 62 :
An electron with kinetic energy 5 eV is incident on ahydrogen atom in its ground state. The collision
Question 63 :
If the minimum energy of photons needed to produce photoelectric effect is 3eV, bombarding the photoelectric material by a number of photons of 2.5eV also one can get
