McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Uncategorized topics .
Chapters
| 1. |
In order to find the internal structure of nucleus, electrons should be accelerated by voltages up to |
| A. | 105 V |
| B. | 107 V |
| C. | 109 V |
| D. | 1011 V |
| Answer» C. 109 V | |
| 2. |
High speed electrons have wavelength of order |
| A. | 10-15 m |
| B. | 10-14 m |
| C. | 10-16 m |
| D. | 10-17 m |
| Answer» A. 10-15 m | |
| 3. |
Wavelength of slow moving neutrons is about |
| A. | 10-34 m |
| B. | 10-20 m |
| C. | 10-19 m |
| D. | 10-10 m |
| Answer» D. 10-10 m | |
| 4. |
High speed electrons from particle detectors are used to determine |
| A. | arrangement of atoms in metals |
| B. | diameter of atomic nuclei |
| C. | inter atomic distance |
| D. | circumference of atomic nuclei |
| Answer» B. diameter of atomic nuclei | |
| 5. |
Energy of gamma photon is greater than |
| A. | 102 J |
| B. | 10-13 J |
| C. | 1013 J |
| D. | 105 J |
| Answer» B. 10-13 J | |
| 6. |
Waves associated with electrons are referred to as |
| A. | plasma waves |
| B. | UV waves |
| C. | gamma rays |
| D. | matter waves |
| Answer» D. matter waves | |
| 7. |
Frequency below which no electrons are emitted from metal surface is |
| A. | minimum frequency |
| B. | angular frequency |
| C. | maximum frequency |
| D. | threshold frequency |
| Answer» D. threshold frequency | |
| 8. |
Loss of energy of an electron results in |
| A. | absorption of photon |
| B. | emission of photon |
| C. | destruction of photon |
| D. | formation of photon |
| Answer» B. emission of photon | |
| 9. |
Wavelength of a 65 kg person running at a speed of 3 m s -1 through an opening of width 0.80 m is {{}} |
| A. | 34 m |
| B. | 35 m |
| C. | 3.4 × 10-36 m |
| D. | 3.5 m |
| Answer» C. 3.4 × 10-36 m | |
| 10. |
According to Newton, the light travels as |
| A. | particles |
| B. | waves |
| C. | both A and B |
| D. | dust |
| Answer» A. particles | |
| 11. |
In electron diffraction, the rings behave as |
| A. | particles |
| B. | waves |
| C. | both A and B |
| D. | rays |
| Answer» B. waves | |
| 12. |
Energy absorbed by electron is used in |
| A. | escaping the metal |
| B. | increasing kinetic energy |
| C. | both A and B |
| D. | increasing frequency |
| Answer» C. both A and B | |
| 13. |
Diffraction of slow moving electrons is used to estimate |
| A. | arrangement of atoms in metals |
| B. | nature of atoms |
| C. | number of atoms in metals |
| D. | position of atoms in metalloids |
| Answer» A. arrangement of atoms in metals | |
| 14. |
Energy of photon is directly related to the |
| A. | wavelength |
| B. | wave number |
| C. | frequency |
| D. | amplitude |
| Answer» C. frequency | |
| 15. |
When a charged particle is accelerated through a potential difference V, it's kinetic energy |
| A. | decreases |
| B. | remains same |
| C. | increases |
| D. | varies depending on resistance of wire |
| Answer» C. increases | |
| 16. |
Energy of an electron in an atom is |
| A. | quantized |
| B. | continuous |
| C. | radial |
| D. | randomized |
| Answer» A. quantized | |
| 17. |
In dark, LDR has |
| A. | low resistance |
| B. | high current |
| C. | high resistance |
| D. | both A and B |
| Answer» C. high resistance | |
| 18. |
1 eV is equal to {{}} |
| A. | 1.6 × 10 -19 J |
| B. | 2.0 × 10 -20 J |
| C. | 3 J |
| D. | 4 J |
| Answer» A. 1.6 × 10 -19 J | |
| 19. |
Electrons show diffraction effects because their de Broglie wavelength is similar to |
| A. | spacing between atomic layers |
| B. | no. of atomic layers |
| C. | nature of atomic layers |
| D. | positioning of atomic layers |
| Answer» A. spacing between atomic layers | |
| 20. |
Characteristic properties of waves are |
| A. | reflection |
| B. | refraction |
| C. | interference |
| D. | all of above |
| Answer» D. all of above | |
| 21. |
Plank's constant has units {{}} |
| A. | J |
| B. | s |
| C. | J s-1 |
| D. | J s |
| Answer» D. J s | |
| 22. |
Gas atoms that exert negligible electrical forces on each other are |
| A. | molecules |
| B. | compounds |
| C. | isotopes |
| D. | isolated atoms |
| Answer» D. isolated atoms | |
| 23. |
Wavelength of red color is about {{}} |
| A. | 7 × 10-7 m |
| B. | 7 × 107 nm |
| C. | 4 × 10-7 m |
| D. | 4 × 10-7 nm |
| Answer» A. 7 × 10-7 m | |
| 24. |
Quantum of electromagnetic energy is called |
| A. | particles |
| B. | photons |
| C. | waves |
| D. | energy |
| Answer» B. photons | |
| 25. |
In photoelectric effect, electrons should be removed from the |
| A. | inner shells |
| B. | surface |
| C. | from core |
| D. | the nucleus |
| Answer» B. surface | |
| 26. |
Light interacts with matter as |
| A. | wave |
| B. | particle |
| C. | both A and B |
| D. | rays |
| Answer» B. particle | |
| 27. |
When white light is passed through cool gases, the spectra observed is called |
| A. | line spectra |
| B. | continuous spectra |
| C. | emission line spectra |
| D. | absorption line spectra |
| Answer» D. absorption line spectra | |
| 28. |
Wavelength of ultraviolet region of electromagnetic spectrum is |
| A. | 121 nm |
| B. | 120 nm |
| C. | 119 nm |
| D. | 130 nm |
| Answer» A. 121 nm | |
| 29. |
In an insulator, the valence band is |
| A. | fully occupied |
| B. | fully empty |
| C. | half filled |
| D. | half charged |
| Answer» A. fully occupied | |
| 30. |
Most energetic photons are |
| A. | alpha |
| B. | beta |
| C. | gamma |
| D. | x-rays |
| Answer» C. gamma | |
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