2nd Year Physics Second half Book Paper

Q1. Multiple choice questions (Attempt all · 17 × 1 = 17)

1. An increase in the wavelength of spectral lines from distant stars and galaxies compared to their laboratory values is called:

   1. Blueshift

   2. Redshift

   3. Absorption spectrum

   4. Blackbody radiation

2. Positron Emission Tomography (PET) works through gamma-ray detection and which of the following physical processes?

   1. Piezoelectric effect

   2. Positron–electron annihilation

   3. Nuclear fission

   4. X-ray diffraction

3. Quanta is the plural form of:

   1. Quantum

   2. Quark

   3. Quarkum

   4. Quantae

4. The potential energy called binding energy is considered to have a value similar to absolute gravitational potential:

   1. Positive

   2. Neutral

   3. Negative

   4. Zero

5. What technology uses sensors aboard orbiting spacecraft to monitor Earth's environment from space?

   1. Thermohaline circulation

   2. Satellite remote sensing

   3. Ground-based seismology

   4. Anemometry

6. Which type of radiation has enough energy to remove electrons from atoms and produce ions?

   1. Non-ionizing radiation

   2. Ultrasonic radiation

   3. Ionizing radiation

   4. Radiowaves

7. The current measured in a photoelectric circuit when light shines on the cathode is known as:

   1. Alternating current

   2. Thermal current

   3. Photoelectric current 

   4. Saturation voltage

8. An atomic mass unit (u) is defined as 1/12th of the mass of an unbound neutral atom of:

   1. Hydrogen-1

   2. Carbon-12

   3. Uranium-235

   4. Helium-4

9. Which combination of properties makes water the heaviest and most dense?

   1. Warm and less salty water

   2. Warm and highly salty water

   3. Cold and less salty water

   4. Cold and highly salty water

10. During a scan inside a CT-scanner, which component dynamically rotates around the patient's body?

    1. The monitor display

    2. The electronic detector panel

    3. The X-ray tube

    4. The patient's table bed

11. If the intensity of the incident light is increased, what happens to the photoelectric current?

    1. It increases

    2. It decreases

    3. It remains unchanged

    4. It drops to zero

12. To start a fusion reaction by increasing atomic speed, the required temperature is about:

    1. 15 thousand kelvin

    2. 1.5 million kelvin

    3. 15 million kelvin

    4. 150 million kelvin

13. A negative change in wavelength represents a blue shift, which shows that the celestial object is:

    1. Moving away from Earth

    2. Approaching the Earth

    3. Expanding in size

    4. Stationary

14. The transition of electrons in hydrogen or other light elements results in spectral lines in which regions of the electromagnetic spectrum?

    1. X-ray and gamma-ray regions

    2. Infrared, visible, or ultraviolet regions

    3. Microwave and radiowave regions

    4. Cosmic ray region

15. Using uncertainty principle, it can be proved that:

    1. Lght has particle nature

    2. Light has wave nature

    3. Electron lies out of the nucleus

    4. There is always uncertainty in measuring accurately energy and momentum for atomic particles

16. When a heavy nucleus splits into two lighter nuclei, the process is called:

    1. Nuclear Fusion

    2. Alpha Decay

    3. Chemical Reaction

    4. Nuclear Fission

17. What is the SI unit of radiant flux intensity?

    1. Watt

    2. Joule per second

    3. Watt per square metre

    4. Newton per metre