Nuclear Physics and Radiation - Class X
Quiz covering thermionic emission, cathode ray tubes, X-rays, nuclear fission, and radioactive particles for Class X modern physics curriculum.
Questions
Which of the following does not affect the rate of thermionic emission?
- Nature of the metal
- Temperature of surface of the metal
- Shape of the metal
- Both temperature and shape of the metal
- Both temperature and surface area of the metal
Which of the following information about an alpha particle is not correct?
- The mass of an alpha particle is 6.68 x 10-27 kg.
- Its charge is + 3.2 x 10-19 coulomb.
- Its specific charge is 1.76 x 1011coulomb per kilogram.
- It is deflected in both electric and magnetic field.
- It is used for transmutation.
Which of the following is not correct for gamma radiations?
(a) Gamma radiations occur when the parent nucleus is in a state of excitation.
(b) They are the electromagnetic waves.
(c) Their ionising power is very high.
(d) They affect a photographic plate.
(e) They do not cause fluorescence.
- Only (a)
- Only (b)
- Both (a) and (c)
- Both (b) and (d)
- Both (c) and (e)
Which of the following is considered as a helping hand in the manufacture of paper, plastic and metallic sheets?
- Alpha rays
- UV rays
- Gamma rays
- Cosmic rays
- X-rays
Which of the following alternative energy sources pollute(s) the environment?
- Geothermal power plant
- Nuclear power plant
- Solar cells
- Both (1) and (3)
In which of the following electronic devices is the phenomenon of thermionic emission used?
(1) Diode valve
(2) Radio
(3) Stopwatch
- Only (3)
- Both (2) and (3)
- Only (1)
- Both (1) and (2)
On which of the following factors does the rate of emission of electrons depend?
- Surface area of filament
- Temperature of filament
- Material used for filament
- Surface area and temperature of filament, and the material used for filament
Which of the following is not correct regarding cathode ray tube?
- It is also called as Braun’s tube.
- Wehnelt cylinder is not used in cathode ray tube.
- It was invented by Karl Ferdinand Braun.
- It was invented in 1897.
Which of the following options is TRUE?
- X-rays are used in astronomy.
- X-rays can penetrate through human flesh.
- X-rays can pass through metallic materials.
- X-rays are used in optical microscopy.
X-rays are produced when
- electric current flows through the X-ray tube filament
- projectile electrons bounce off the cathode
- projectile electrons interact with target atoms
- the target angle is sufficiently large
Which of the following is not true for electron gun as a part of hot cathode ray tube?
- Cathode C is indirectly heated by filament F.
- The anodes are maintained by means of low tension battery with respect to cathode.
- The rate of emission of electrons increases from cathode on increasing filament current.
- The brightness of pattern on screen varies by changing negative potential on grid.
When can a steady bright spot be seen on the screen on the deflecting system in a hot cathode ray tube?
- When the electron beam strikes the centre of the screen
- When no potential difference is applied across the pairs of plates
- When there is no fluorescence on the screen
- Both (1) and (2)
X-rays are used in
- radio therapy to cure tumors
- sterilizing surgical instruments
- studying the structure of molecules
- detecting invisible writings
Which of the following is not an advantage of nuclear energy?
- Nuclear fuel can be used for a long time.
- It can cause very serious health problems in case of an accident.
- Even a small amount of nuclear fuel has the ability to generate very high amount of energy.
- It helps to reduce the dependence on fossil fuels.
Which of the following statements is/are true?
- In nuclear fission, nucleus of a heavy atom, when bombarded with low energy neutrons, can split apart into lighter nuclei.
- Tremendous amount of energy is released in a nuclear fission reaction.
- Small amount of energy is released in a nuclear fission reaction.
- Both (1) and (2)