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Mdcat-past-papers - ETEA Quiz

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141. The speed of sound in a medium containing ideal gas is NOT dependent on?



142. There are 2 pianos playing the same note. One has a frequency of 223.20Hz and the other 223.50Hz. The beat frequency between them will be:



143. What happens when two waves of the same frequency and amplitude meet in phase?



144. The apparent change in frequency caused by source/listener motion is called:



145. In Doppler effect, the apparent frequency is ___ actual frequency when source moves toward observer:



146. A police car, with its siren on, is moving towards a stationary listener. How does the stationary listener receive the frequency of the sound emitted by the siren? It:



147. Astronomers calculate speed of distant stars/galaxies using of the following phenomena?



148. An isolated thermodynamic system:



149. Consider an ideal gas that confine to the cylinder with a fixed piston. on heating the gas, all the heat supplied increases



150. What happens to a football which is inflated in a warm room and is used to play outside in cold weather?



151. In an adiabatic process, how does the temperature of a gas change as its volume decreases?



152. During an isothermal expansion of an ideal gas, which of the following statement is true?



153. Two bodies A and B of temperatures T_A = 100°C and T_B = 0°C are brought in thermal contact with each other. Which one in the followings is possible at thermal equilibrium?



154. The thermal energy required to cause a unit temperature rise is called:



155. Which of the following quantities is correctly matched to its unit:



156. What is the increase in force between two charges if the separation between them is decreased by 50 percent:



157. According to Coulomb's law, what happens to the electrostatic force between the 2-point charges if the distance between them is doubled?



158. Magnetic lines of force are:



159. The instantaneous power supplied to a circuit is a product of the:



160. Two charges Q₁ = 3μC and Q₂ = –1μC are separated by 100cm. The electric potential is zero at a point:



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