2 Which decay results in the emission of an electron? A Alpha decay B Beta decay C Gamma decay D Fusion
3 Radioactivity is the process in which a nucleus: A Gains electrons B Loses electrons C Emits radiations D Absorbs energy
5 The scattering of light depends on A Wavelength of light B Speed of light C Intensity of light D Reflection of light
6 Which observation supports the existence of dark matter? A Planet motion B Galaxy rotation curves C Tides D Seasons
8 Which electromagnetic wave is safest for human exposure? A Gamma rays B X-rays C Ultraviolet rays D Radio waves
9 Light is considered a wave because it shows A Reflection only B Diffraction and interference C Refraction only D Absorption only
11 Who discovered the atomic nucleus through the gold foil experiment? A J.J. Thomson B Ernest Rutherford C Niels Bohr D James Chadwick
12 Which electromagnetic wave has the highest frequency? A Microwaves B Infrared rays C Visible light D Gamma rays
14 The energy of electromagnetic radiation depends upon its A Wavelength B Frequency C Speed D Amplitude
17 Which type of electromagnetic wave has the longest wavelength? A Gamma rays B X-rays C Radio waves D Ultraviolet rays
18 A scientific theory is falsifiable if it can be: A Proved true B Observed directly C Tested and proven false D Mathematically solved
19 Which law explains energy release in nuclear reactions? A Ohm’s law B Newton’s law C Einstein’s mass-energy relation D Boyle’s law
20 Which electromagnetic waves can damage living tissues the most? A Radio waves B Microwaves C Gamma rays D Infrared rays
21 Fusion requires very high: A Pressure only B Temperature only C Temperature and pressure D Density only
22 The speed of electromagnetic waves in vacuum is A 3 × 10^6 m/s B 3 × 10^7 m/s C 3 × 10^8 m/s D 3 × 10^9 m/s
23 The main source of energy of the Sun is: A Nuclear fission B Chemical reaction C Nuclear fusion D Radioactivity
24 Which electromagnetic wave is used in photography? A Radio waves B Visible light C X-rays D Gamma rays